United Technologies Carrier Weathermaker 48A2 Controls, Start-Up, Operation, Service, And Troubleshooting Download

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Fig. 19 — IGC Service Analysis Logic

LEGEND

NOTE: Thermostat Fan Switch in the
“AUTO” position.

IDM —

Induced-Draft Motor

IGC —

Integrated Gas Unit Controller

A48-5656

Summary of Contents for Carrier Weathermaker 48A2

Page 1: ...Configuration Submenu 30 Cooling Control 32 SETTING UP THE SYSTEM MACHINE DEPENDENT CONFIGURATIONS SETPOINTS SUPPLY AIR RESET CONFIGURATION COOLING CONFIGURATION Page COMPRESSOR SAFETIES COMPRESSOR T...

Page 2: ...tall repair or service air conditioning equipment Untrained personnel can perform the basic maintenance functions of re placing filters Trained service personnel should perform all other operations Wh...

Page 3: ...display scrolling marquee or Navigator accessory will be used in this manual Point names will be written with the Mode name first then any sub modes then the point name each separated by an arrow sym...

Page 4: ...is also available This portable device has an extended communication cable that can be plugged into the unit s communication network either at the main control box or at the opposite end of the unit...

Page 5: ...red again before changes can be made Changing item values or testing outputs is accomplished in the same manner Locate and display the desired item If the display is in rotating auto view press the ke...

Page 6: ...r Setpoint Hi SA HI Supply Air Setpoint Lo SA LO Heating Supply Air Setpoint SA HT Tempering Purge SASP T PRG Tempering in Cool SASP T CL Tempering in Vent Occ SASP T V OC Tempering in Vent Unocc SASP...

Page 7: ...setpoint is required use the scrolling marquee Navigator accessory or Service Tool software to change the configuration valves 3 If the internal unit schedules are going to be used config ure the Occ...

Page 8: ...6 1056 8 82 1083 9 18 1109 9 54 1135 9 91 1160 10 28 1185 10 65 11 000 1004 9 00 1032 9 36 1059 9 73 1086 10 09 1112 10 46 1138 10 84 1163 11 22 1188 11 60 12 000 1039 10 42 1066 10 79 1093 11 16 1119...

Page 9: ...44 1185 13 89 1209 14 34 1233 14 79 1256 15 24 1279 15 69 13 000 1152 14 38 1176 14 84 1200 15 31 1224 15 77 1248 16 24 1271 16 70 1293 17 17 14 000 1196 16 41 1220 16 88 1243 17 36 1266 17 84 1288 1...

Page 10: ...6 21 78 1188 22 40 1210 23 01 1232 23 64 1253 24 26 1275 24 89 1296 25 52 17 000 1208 24 56 1229 25 20 1250 25 84 1271 26 48 1291 27 12 18 000 1250 27 59 1271 28 25 1291 28 91 19 000 1294 30 87 20 000...

Page 11: ...8 27 1043 8 55 1070 8 84 1096 9 12 1122 9 41 1147 9 69 1171 9 98 1195 10 26 12 000 989 8 97 1016 9 26 1043 9 55 1070 9 85 1096 10 14 1121 10 44 1146 10 73 1171 11 03 1195 11 33 12 500 1005 9 66 1032 9...

Page 12: ...74 1287 14 08 14 000 1137 12 98 1161 13 34 1184 13 69 1208 14 05 1231 14 41 1253 14 76 1276 15 12 1298 15 47 15 000 1178 14 77 1201 15 15 1223 15 51 1246 15 88 1268 16 25 1289 16 62 16 000 1221 16 73...

Page 13: ...5 25 99 1275 26 61 1295 27 23 18 000 1190 25 70 1210 26 34 1230 26 97 1250 27 61 1270 28 25 1290 28 89 19 000 1230 28 73 1250 29 38 1269 30 04 1289 30 70 20 000 1271 31 99 1290 32 67 AIRFLOW Cfm AVAIL...

Page 14: ...0 69 1171 11 12 1195 11 56 10 000 993 8 96 1021 9 38 1048 9 80 1075 10 23 1101 10 67 1126 11 11 1151 11 55 1176 12 00 1200 12 45 11 000 1031 10 37 1058 10 80 1084 11 23 1110 11 67 1135 12 12 1160 12 5...

Page 15: ...96 13 02 1220 13 45 1243 13 87 1266 14 30 1289 14 72 12 000 1138 13 05 1163 13 50 1188 13 95 1212 14 40 1236 14 84 1259 15 30 1282 15 74 13 000 1184 14 99 1208 15 45 1232 15 92 1255 16 39 1278 16 85 1...

Page 16: ...18 97 1195 19 55 1218 20 15 1241 20 75 1263 21 35 1285 21 96 15 000 1166 20 27 1189 20 88 1211 21 49 1234 22 09 1256 22 71 1277 23 32 1299 23 94 16 000 1210 23 00 1231 23 62 1253 24 25 1274 24 88 1295...

Page 17: ...10 37 1189 10 72 11 000 987 8 89 1015 9 24 1042 9 59 1068 9 94 1094 10 29 1119 10 65 1144 11 01 1168 11 36 1191 11 72 12 000 1022 10 31 1048 10 67 1075 11 03 1100 11 39 1125 11 75 1150 12 12 1173 12...

Page 18: ...2 18 1259 12 49 1281 12 80 13 000 1133 11 83 1157 12 17 1181 12 51 1205 12 85 1228 13 19 1251 13 52 1273 13 86 1295 14 19 14 000 1176 13 56 1199 13 92 1222 14 28 1245 14 63 1268 14 99 1290 15 34 15 00...

Page 19: ...0 1156 21 52 1178 22 11 1199 22 71 1220 23 31 1241 23 91 1262 24 51 1282 25 12 17 000 1198 24 28 1218 24 90 1239 25 52 1259 26 14 1279 26 76 1299 27 38 18 000 1240 27 29 1260 27 93 1280 28 57 1300 29...

Page 20: ...23 4 17 46 28 7 23 0 19 183 91 0 25 18 65 28 9 21 56 73 0 23 511 91 7 29 4 21 93 37 4 28 4 23 918 91 7 30 22 38 35 6 26 56 91 0 28 742 92 4 34 7 25 89 43 8 36 3 28 015 92 4 40 29 84 42 0 31 33 110 0 5...

Page 21: ...age 22 for additional exhaust option configurations Multi Stage Constant Volume Units with Mechanical Thermostat To configure the unit per form the following 1 Under Configuration UNIT C TYP set C TYP...

Page 22: ...xhaust Option For modulating exhaust in the Configuration BP submenu configure the following Programming Operating Schedules The ComfortLink controls will accommodate up to eight dif ferent schedules...

Page 23: ...s the new request will be delayed for 5 seconds For example if com pressors were turned on under the COOL sub mode any at tempt to turn on heating stages within the HEAT sub mode would immediately tur...

Page 24: ...he valves under normal circumstances Service Test HMZR B CAL Bypass EXV Cali brate On Humidi Mizer configured units this item allows the user to calibrate the valve that controls discharge gas bypass...

Page 25: ...rols expansion module CEM using TB 11 and 12 An optional CEM board is required SeeAppendix C and the VFD literature supplied with the unit for VFD configurations and field wiring connections to the VF...

Page 26: ...h is open the economizer will be commanded to the IAQ Demand Vent Minimum Position These settings may be adjusted and are located at Configura tion IAQ DCV C IAQ M If the switch is closed the IAQ read...

Page 27: ...control are located at the local displays under Operating Modes See Table 31 Currently Occupied OCC This variable displays the cur rent occupied state of the unit Timed Override in Effect T OVR This v...

Page 28: ...mizer is at minimum vent position but the combination of the outside air temperature and the economizer position has dropped the supply air temperature below the tempering cool setpoint Staged gas hea...

Page 29: ...AND Config UNIT SFS S YES HVAC Mode OFF Fan Status Fail HVAC Mode OFF Starting Up Unit shutting down HVAC Mode Shutting Down Unit control free to select normal heating cooling HVAC mode HVAC Mode OFF...

Page 30: ...S Enable 4 to 20 mA Sup ply Air Reset Sensor Enable Configuration DMD L DM L S 1 2 SWITCHES Demand Limiting using 2 discrete switches Configuration DMD L DM L S 2 4 20 MA CTRL Demand Limiting using a...

Page 31: ...s dehumidification Auxiliary Relay Configuration AUX R This option con figures the auxiliary relay on the MBB RLY11 The function of this relay is configurable in the following ways AUX R 0 Alarm Outpu...

Page 32: ...be used instead of return air temperature to start the fan for 10 minutes before the return air temperature is allowed to call out any mode C TYP 3 TSTAT MULTI This configuration will force the contro...

Page 33: ...RANGE UNITS CCN POINT DEFAULT OHSP Occupied Heat Setpoint 40 99 dF OHSP 68 OCSP Occupied Cool Setpoint 40 99 dF OCSP 75 UHSP Unoccupied Heat Setpoint 40 99 dF UHSP 55 UCSP Unoccupied Cool Setpoint 40...

Page 34: ...ls as to whether a digital scroll compres sor is installed If set to YES the compressor will be controlled by the compressor staging routine and SUMZ Cooling Algorithm The digital scroll compressor lo...

Page 35: ...urs a strike is called out on the affect ed compressor If three successive strikes occur the compressor will be locked out requiring a manual reset or power reset of the circuit board The clearing of...

Page 36: ...a cooling mode during the occupied period if the return air temperature drops low enough When supply air temperature reset is not configured this capability will work to prevent over cooling the spac...

Page 37: ...at Cool Mode Selection C TYP 3 and 4 When a thermostat type is selected the decision making pro cess involved in determining the mode is straightforward Upon energizing the Y1 input only the unit HVAC...

Page 38: ...han one every 30 seconds If the control needs to bring on 2 compressors at once the first compressor will come on followed by the second compressor 30 seconds later Staging of compressors is shown in...

Page 39: ...OFF ON ON OFF OFF ON A2 OFF OFF ON OFF ON ON B1 OFF OFF ON OFF OFF ON UNIT Unit Capacity Unit Capacity 020 0 30 100 0 30 100 025 0 33 100 0 33 100 027 0 33 100 0 33 100 STAGE SEQUENCE 1 SEQUENCE 2 0 1...

Page 40: ...the control is configured for and capable of controlling Active Demand Limit DEM L If demand limit is active this variable will represent the amount of capacity that the control is currently limited...

Page 41: ...top unit the design rise at 100 total unit capacity is generally around 30 F For a unit with 4 stages each stage represents about 7 5 F of change to EDT If stages could reliably be cycled at very fast...

Page 42: ...table whereby it can more closely determine the true MAT value MAT S 2 The control will not attempt to learn MAT over time To calculate MAT linearly the user should reset the MAT table entries by set...

Page 43: ...ine command the machine will be prevented from starting if it is not running If it is running then DEM L is set equal to the current running cooling capac ity Run Status COOL C CAP Upon reception of a...

Page 44: ...re values DP A and DP B can be viewed under the Pressures REF P submenu Head Pressure Configurations There are two configura tions provided for head pressure control that can be found at the local dis...

Page 45: ...modulates to control HP setpoint Stage 2 if OAT 75 Stage 2 if SCTA or STCB HPSP Stage down if SCTA B HPSP 40 for two minutes and OAT 73 Stage down starts with MM_A_VFD at 50 then modulates to control...

Page 46: ...M 1 4 MM 2 3 WITHOUT MOTORMASTER OPTION 50 Ton 60 Ton RTPF Contactor OFM s Software Board Conrolled Controlled Common CONDFANA MBB Rly 6 OFC1 OFM1 2 Common CONDFANB MBB Rly 5 OFC2 OFM3 4 5 6 of Fans O...

Page 47: ...1 OFC1 1 OFM1 Stage 2 OFC3 4 2 OFM3 4 Stage 2 OFC1 2 2 OFM1 2 WITH MOTORMASTER OPTION 60 Ton MCHX Contactor OFM s Software Board Conrolled Controlled A CONDFANA MBB Rly 6 OFC4 OFM4 A MM_A_RUN SCB Rel...

Page 48: ...HEAT and HVAC Mode HIGH HEAT These modes will be called out based on control type C TYP VAV RAT C TYP 1 and VAV SPT C TYP 2 There is no difference in the selection of a heating mode for either VAV RA...

Page 49: ...ure falls below the heating setpoint minus L H ON minus H H ON then HVAC mode HIGH HEAT To get out of a LOW HEAT mode the controlling tempera ture must rise above the heating setpoint minus L H ON plu...

Page 50: ...oint and allows staging to react quicker Limit Switch Monitoring LIM M This configuration allows the operation of the limit switch monitoring routine This should be set to NO as a limit switch tempera...

Page 51: ...is clamped between 0 and the maximum number of stages possible Run Status VIEW H MAX for the chosen set of staging patterns See Tables 54 58 INTEGRATED GAS CONTROL BOARD LOGIC All gas heat units are e...

Page 52: ...FF OFF OFF 33 3 OFF OFF ON OFF OFF OFF 50 4 OFF OFF ON ON OFF OFF 67 5 ON OFF ON OFF OFF OFF 75 6 ON ON ON OFF OFF OFF 83 7 ON ON ON ON OFF OFF 100 STAGE RELAY OUTPUT CAPACITY Heat 1 Heat 2 Heat 3 Hea...

Page 53: ...splay under Setpoints Operation First the unit must be in a vent mode a low cool mode or a high cool HVAC mode to be considered for a tem pering mode Secondly the tempering mode is only allowed when t...

Page 54: ...mode and the compressor stage less than 50 fan will be as SP MN minimum speed When in HIGH COOL the fan will be at SP MX maximum speed In heating mode the fan will operate at SP MX maximum speed when...

Page 55: ...et for the calcula tion cannot be larger than the supply air static setpoint SPSP The calculation is as follows Static Pressure Reset SP LM x ECONOSPR ECONOMIN As an example the static pressure reset...

Page 56: ...his variable reflects the value of the static pressure sensor signal received by the ComfortLink controls The value may be helpful in troubleshooting Static Pressure mA Trim SP M T This input allows a...

Page 57: ...he fan is on and the unit is not in a test mode and the filter status switch reads dirty for 2 continuous minutes an alert is generated Recovery from this alert is done through a clearing of all alarm...

Page 58: ...much outside air alerts shall be logged The control shall automatically clear the jammed actuator alerts as follows If the actuator jammed while opening when ECONOPOS is greater than the jammed positi...

Page 59: ...he user may select this option E SEL 1 to perform a qualification of return and outside air in the enabling and disabling of free cooling If this option is selected and outside air temperature is grea...

Page 60: ...T OAT 8 The Unoccupied Economizer Free Cooling Mode will stop when either of the following conditions are true SPT OCSP OR SPT OAT 3 where SPT Space Temperature and OCSP Occupied Cooling Setpoint When...

Page 61: ...omizer Min Position 0 100 ECONOMIN 5 EC MX Economizer Max Position 0 100 ECONOMAX 98 EP MS Economizer Position at Minimum VFD Speed 0 100 EPOSMNFS 5 EP XS Economizer Position at Maximum VFD Speed 0 10...

Page 62: ...et the control point upwards 10 degrees 2 degrees per psig between the low suction pressure trip point of 93 psig If this does not work and if the suction pres sure drops below the trip point then the...

Page 63: ...BP ZG This configuration is not used It currently has no effect on building pressure control High Building Pressure Level BP HP This configura tion is the threshold level above the building pressure s...

Page 64: ...ss Integ Gain 0 2 BLDGP_IG 0 5 BP D Bldg Press Deriv Gain 0 5 BLDGP_DG 0 3 BP SO BP Setpoint Offset 0 0 0 5 H2O BPSO 0 05 BP MN BP VFD Minimum Speed 0 100 BLDGPMIN 10 BP MX BP VFD Maximum Speed 0 100...

Page 65: ...ed output can be found in Outputs ECON ECN C The configurable fire speed override for supply fan VFD is in Configuration SP SP FS The supply fan relay s commanded output can be found in Outputs FANS S...

Page 66: ...these bounds must be reconfigured These pertinent configurations for ranging the air quality sensors are IQ R L IQ R H OQ R L and OQ R H The bounds represent the PPM corresponding to 4 mA low and 20...

Page 67: ...etween IAQ and OAQ is above Configuration IAQ AQ SP DAQ H the economizer minimum position will be the IAQ override position Configuration IAQ AQ SP IQ O P IQ A C 3 4 to 20 mA minimum position With a 4...

Page 68: ...AQANFAN 0 IQ I C IAQ Discrete Input Config 0 2 IAQINCFG 0 IQ I F IAQ Disc In Fan Config 0 2 IAQINFAN 0 OQ A C OAQ 4 20ma Sensor Config 0 2 OAQANCFG 0 AQ SP AIR QUALITY SETPOINTS IQ O P IAQ Econo Overr...

Page 69: ...will be used with a non Carrier OAQ sensor that may have a different characteristic curve It represents the CO2 level at 20 mA PRE OCCUPANCY PURGE The control has the option for a pre occupancy purge...

Page 70: ...as or hydronic heat Dehumidification without reheat can be done on any unit but Configuration DEHU D SEL must be set to 2 If the machine s control type is a TSTAT type Configura tion UNIT C TYP 3 or 4...

Page 71: ...ng Valve Con denser EXV position output can be found in Outputs COOL C EXV The condenser position will be provided as percent open The Humidi MiZer Bypass Modulating Valve Bypass EXV position output c...

Page 72: ...ings for tempera ture compensated start can be found in the local display under Configuration UNIT TCST Cool Factor TCS C This is the factor for the start time bias equation for cooling TCST Heat Fact...

Page 73: ...CN OARH Broadcast ORH B If this configuration is set to ON the control will periodically broadcast its outside air relative humidity at a rate of once every 30 minutes CCN OAQ Broadcast OAQ B If this...

Page 74: ...matically reset RAT Low Alert Limit Occ RA L O If the return air tem perature is below the configurable occupied RAT Low Alert Limit RA L O then Alert 304 will be generated and internal routines will...

Page 75: ...be calibrated These inputs are located in Inputs 4 20 They are SP M T static pressure milliamp trim BP M T building pressure milliamp trim OA M T outside air cfm milliamp trim RA M T return air cfm m...

Page 76: ...to the remote discrete input 0 NO REMOTE SW The remote switch will not be used 1 OCC UNOCC SW The remote switch input will control the occupancy state When the remote switch input is ON the unit will...

Page 77: ...7 Year YEAR This variable is the current year for ex ample 2005 Local Time Schedule SCH L This submenu is used to program the time schedules There are 8 periods PER 1 through PER 8 Each time period ca...

Page 78: ...the start month for daylight savings time The numbers 1 to 12 correspond to the months of the year e g January 1 Daylight Savings Start Week DS ST ST WK This is the start week of the month for daylig...

Page 79: ...erature profiles satisfy the corresponding mode setting See page 23 for Service Test information In addition to the Cooling Service Analysis Table 79 see the Humidi MiZer Service Analysis Table 80 for...

Page 80: ...e valve is fully open 8 Fan running in reverse direction 8 Correct wiring Outdoor Fan Off 1 Fan slips on shaft 1 Tighten fan hub setscrews 2 Motor not running 2 Check power and capacitor 3 Motor overl...

Page 81: ...MiZer relative humidity sensor not functioning RARH SPRH or field installed RH sensor Check that a relative humidity sensor is connected and that the appropriate sensor is configured in the unit soft...

Page 82: ...uring a dehumidification mode Evaporator discharge temperature CCT or supply air temperature SAT thermistor is reading incorrectly See Thermistor Troubleshooting section on page 79 Check if SAT thermi...

Page 83: ...ration Adjust mini mum position using ComfortLink scrolling marquee Limit switch cycles main burners Check rotation of blower thermostat heat anticipator set tings and temperature rise of unit Adjust...

Page 84: ...84 Fig 19 IGC Service Analysis Logic LEGEND NOTE Thermostat Fan Switch in the AUTO position IDM Induced Draft Motor IGC Integrated Gas Unit Controller A48 5656...

Page 85: ...3 906 88 1 298 3 814 89 1 278 3 726 90 1 257 3 640 91 1 237 3 556 92 1 217 3 474 93 1 198 3 395 94 1 179 3 318 95 1 160 3 243 96 1 141 3 170 97 1 122 3 099 98 1 104 3 031 99 1 086 2 964 100 1 068 2 8...

Page 86: ...749 3 2 547 14 026 4 2 500 13 342 5 2 454 12 696 6 2 407 12 085 7 2 360 11 506 8 2 312 10 959 9 2 265 10 441 10 2 217 9 949 11 2 170 9 485 12 2 123 9 044 13 2 076 8 627 14 2 029 8 231 TEMP C VOLTAGE...

Page 87: ...88 2 173 7 685 89 2 144 7 507 90 2 115 7 333 91 2 087 7 165 92 2 059 6 999 93 2 030 6 838 94 2 003 6 683 95 1 975 6 530 96 1 948 6 383 97 1 921 6 238 98 1 894 6 098 99 1 867 5 961 100 1 841 5 827 101...

Page 88: ...80 4 203 47 1 439 4 042 48 1 400 3 889 49 1 362 3 743 50 1 324 3 603 51 1 288 3 469 52 1 252 3 340 53 1 217 3 217 54 1 183 3 099 55 1 150 2 986 56 1 117 2 878 57 1 086 2 774 58 1 055 2 675 59 1 025 2...

Page 89: ...39 48 0 938 154 1 982 259 3 015 364 4 049 49 0 948 155 1 992 260 3 025 365 4 059 50 0 958 156 2 001 261 3 035 366 4 068 51 0 968 157 2 011 262 3 045 367 4 078 52 0 978 158 2 021 263 3 055 368 4 088 53...

Page 90: ...705 292 2 201 50 0 718 131 1 214 212 1 711 293 2 207 51 0 724 132 1 220 213 1 717 294 2 213 52 0 730 133 1 226 214 1 723 295 2 220 53 0 736 134 1 233 215 1 729 296 2 226 54 0 742 135 1 239 216 1 735...

Page 91: ...213 540 3 721 623 4 230 375 2 710 458 3 219 541 3 728 624 4 236 376 2 716 459 3 225 542 3 734 625 4 243 377 2 722 460 3 231 543 3 740 626 4 249 378 2 728 461 3 237 544 3 746 627 4 255 379 2 734 462 3...

Page 92: ...ages active for staged gas control option only Compare to following point Run Status VIEW H MAX This variable displays the maximum number of heat stages available for this model ECONOMIZER RUN STATUS...

Page 93: ...LAY TABLE The CCN Linkage display table provides information on unit linkage See Table 95 COMPRESSOR RUN HOURS DISPLAY TABLE The Compressor Run Hours Display Table displays the number of run time hour...

Page 94: ...aporator Discharge Tmp EDT H CPT Heating Control Point HEATCPNT LAT Leaving Air Temperature LAT ITEM EXPANSION RANGE UNITS POINT WRITE STATUS TRIP MODE TRIP HELPER UN C S Unoccup Cool Mode Start UCCLS...

Page 95: ...rt codes 051 052 055 and 056 are for compressors A1 A2 B1 and B2 respectively These alerts occur when the current sensor CS does not detect compressor current during compressor operation When this occ...

Page 96: ...0 Circuit A Low Saturated Suction Temperature Alert Stop circuit Automatic Low refrigerant charge low airflow dirty coil broken fan belt TXV problem A121 Circuit B Low Saturated Suction Temperature Al...

Page 97: ...filter switch setting A409 Supply Fan Status Failure Stop unit Automatic Fan drive failure T409 Supply Fan Status Failure Continue to run unit Automatic Fan drive failure or sensor failure T414 Loss o...

Page 98: ...ode and observe compressor opera tion to verify that compressor current sensor is working and condenser fans are energized after compressor starts T072 Evaporator Discharge Reset Sensor Failure If the...

Page 99: ...y low refrigerant pressure or a faulty suction pressure transducer P120 Circuit A Low Saturated Suction Temperature Compressor A2 Shutdown T120 Circuit A Low Saturated Suction Temperature Alert A120 C...

Page 100: ...curs to indicate a fire or smoke condition then Alarm code 150 will occur and the unit will be immediately stopped Through separate inputs the unit can be put into purge evacuation and pressurization...

Page 101: ...en an alert will be broadcast The alert will automatically reset T302 Supply Temperature Below Limit If the supply air temperature measured by the supply temperature sensor is below the configurable S...

Page 102: ...able Configuration SW LG SFS L Verify that the configura tion is set correctly Verify the wiring and filter status switch The hose should be connected to the low side of the switch This alert resets a...

Page 103: ...peratures AIR T S G LS without the failed thermistor Recovery is automatic Reason for failure may be incorrect wiring faulty thermistor or a damaged input on the staged gas control board SCB A704 Stag...

Page 104: ...hes including smoke control mode field switches VAV supply air temperature setpoint reset using an external 4 to 20 mA signal outdoor air CO2 sensor for supply duct pressure reset using an eternal 4 t...

Page 105: ...105 Fig 20 Typical Main Control Box Wiring Schematic 48 50A2 A3 A4 A5 Units...

Page 106: ...106 Fig 21 Typical Auxiliary Control Box Wiring Schematic...

Page 107: ...107 Fig 22 Typical 2 Stage Gas Heat Wiring Schematic Size 060 Units Shown a48 8357...

Page 108: ...108 TO NEXT PAGE Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown A48 7296...

Page 109: ...109 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown cont A48 8358...

Page 110: ...110 Fig 24 Typical Electric Heat Control Schematic 50 Series Size 060 Units Shown a50 8228...

Page 111: ...111 Fig 25 Typical Power Schematic 48 50A2 A3 A4 A5 060 Unit Shown...

Page 112: ...112 Fig 26 Typical Low Ambient Controls Option Wiring...

Page 113: ...113 Fig 27 Typical Small Chassis Component Location Size 020 035 Units...

Page 114: ...114 Fig 28 Typical Large Chassis Component Locations Size 040 060 Units...

Page 115: ...Effect Induced Draft Motor Switch HVS Humidi Mizer Valve Solenoid IAQ Indoor Air Quality IDF Induced Draft Fan IDM Induced Draft Motor IFC Indoor Fan Contactor IFCB Indoor Fan Circuit Breaker IFM Indo...

Page 116: ...mistor 18 20 0 5vdc thermistor ohms RAT Return air temperature AN5 J8 9 10 9 thermistor ohms SA_TEMP Supply air temperature AN6 J8 11 12 11 thermistor ohms OAT Outdoor air temperature AN7 J8 13 14 13...

Page 117: ...B 1 Closes RLY6A RLY6B POINT NAME POINT DESCRIPTION I O POINT NAME PLUG AND PIN REFERENCE SIGNAL PIN S PORT STATE INPUTS DI1 J4 1 2 2 Vin 1 24VAC 24VAC 1 0VAC 0 DI2 J4 3 4 4 Vin 3 24vac 24VAC 1 0VAC 0...

Page 118: ...118 Fig 30 Economizer Control Board ECB1 and VAV Control Board ECB2 A48 7706...

Page 119: ...GND thermistor 4 5 0 5VDC thermistor ohms AN8 J6 7 9 7 5v 8 Vin 9 GND thermistor 7 8 0 5VDC thermistor ohms AN9 J7 1 2 1 thermistor ohms AN10 J7 3 4 3 thermistor ohms OUTPUTS AO1 J8 1 2 1 0 20mA 2 GND...

Page 120: ...1 5v 2 Vin 3 GND thermistor 1 2 0 5VDC thermistor ohms AN7 J6 4 6 4 5v 5 Vin 6 GND thermistor 4 5 0 5VDC thermistor ohms AN8 J6 7 9 7 5v 8 Vin 9 GND thermistor 7 8 0 5VDC thermistor ohms AN9 J7 1 2 1...

Page 121: ...EDTRESMA 4 20mA Evaporator Discharge SP Reset AN9 J6 7 9 8 7 loop power 0 20mA input OAQ Outside Air CO2 Sensor AN10 J6 10 12 11 10 loop power 0 20mA input SPRESET SP Reset milliamps AN10 J6 10 12 11...

Page 122: ...BITED when P5 5 1 and P5 4 1 12VDC J6 3 3 Power Output Coil3A J6 4 4 HI Z when P5 3 and P5 2 0 12vdc when P5 3 1 and P5 2 0 0vdc when P5 3 0 and P5 2 1 PROHIBITED when P5 3 1 and P5 2 1 Coil4A J6 5 5...

Page 123: ...1 C34 C28 C5 C5 C5 C2 C3 C33 R146 L5 U5 D3 D6 D7 C2 C2 R2 R1 R2 C25 R24 R25 R44 R49 R23 C42 C55 L3 R2 R34 D13 R14 R15 R7 R13 C15 FL1 C20 D11 L2 R30 R11 R26 C41 9 11 9 1 1 1 1 1 R18 C1 R33 R32 C54 R11...

Page 124: ...ower exhaust fans are forward curved fans with direct drive motors The motors are controlled directly by the ComfortLink controls through the ECB1 board On the 48 50A020 050 units there are 4 fans On...

Page 125: ...fortLink controls support 5 different changeover schemes for the economizer These are outdoor air dry bulb differential dry bulb outdoor air enthalpy curves differential enthalpy custom curves a combi...

Page 126: ...5 2 4 6 8 10 12 14 16 TB5 TB6 TB3 TB4 C LEN CCN CCN GRD Fig 36 Field Connection Terminal Strips Main Control Box A48 7081 J6 TB4 1 2 3 4 5 6 7 1 2 3 4 5 6 7 TB5 UNIT CONTROL BOX 1 2 J3 J5 J4 B4 OVERRI...

Page 127: ...8 Smoke Detector Remote Alarm external contacts 9 Smoke Detector Remote Alarm external contacts 10 Fire Shutdown 24 VAC external 11 Fire Shutdown external contact 12 Fire Control Common external cont...

Page 128: ...ystem element the shields of its communication bus cables must be tied together If the communication bus is en tirely within one building the resulting continuous shield must be connected to a ground...

Page 129: ...RED MIXING BOX TO ADDITIONAL TERMINALS HEATING COOLING UNITS COMPUTER WITH ComfortView SOFTWARE ROOFTOP UNIT CL ROOFTOP UNIT CL ROOFTOP UNIT CL ROOFTOP UNIT CL CCN BUS CL COMFORT CONTROLLER COMFORT ID...

Page 130: ...l If cleaning is required remove motor and wheel assembly by removing screws holding motor mounting plate to top of combustion fan housing Fig 42 and 43 The motor scroll and wheel assembly can be remo...

Page 131: ...a low velocity garden hose being careful not to bend fins 5 Mix Totaline environmentally balanced coil cleaner in a 21 2 gallon garden sprayer according to the instructions included with the cleaner T...

Page 132: ...designed for speed shown in Physical Data table in unit Installation Instructions factory speed setting To change fan speeds change pulleys To align fan and motor pulleys 1 Shut off unit power supply...

Page 133: ...e slack side of the drive while running under full load 5 Tighten nuts 6 Adjust bolts and nut on mounting plate to secure motor in fixed position Recheck belt tension after 24 hours of operation Adjus...

Page 134: ...b increments until complete Ensure that all fans are on and all compressors are running when using charging charts To Use the Cooling Charging Chart Use the outdoor air temperature saturated suction t...

Page 135: ...SST 45 F SST 55 F SST 35 F 20 Ton MCHX CIRCUIT B Charging Chart All Compressors on a Circuit Must be Operating All Outdoor Fans Must be Operating 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140...

Page 136: ...115 120 125 Outdoor Air Temperature deg F Saturated Condensing Temperature deg F Reduce Charge if Above Curve Add Charge if Below Curve S S T 4 5 F S S T 5 5 F S S T 3 5 F 25 and 27 Ton MCHX CIRCUIT B...

Page 137: ...T 4 5 F S S T 5 5 F S S T 3 5 F 30 Ton MCHX CIRCUIT B Charging Chart All Compressors on a Circuit Must be Operating All Outdoor Fans Must be Operating 70 75 80 85 90 95 100 105 110 115 120 125 130 135...

Page 138: ...4 5 F S S T 5 5 F S S T 3 5 F 35 Ton MCHX CIRCUIT B Charging Chart All Compressors on a Circuit Must be Operating All Outdoor Fans Must be Operating 85 90 95 100 105 110 115 120 125 130 135 140 145 15...

Page 139: ...040 with R 410A Refrigerant LEGEND MCHX Microchannel Heat Exchanger SST Saturated Suction Temperature 50 Ton MCHX Charging Chart All Compressors on a Circuit Must be Operating All Outdoor Fans Must be...

Page 140: ...T 4 5 F S S T 5 5 F S S T 3 5 F 60 Ton MCHX CIRCUIT B Charging Chart All Compressors on a Circuit Must be Operating All Outdoor Fans Must be Operating 70 75 80 85 90 95 100 105 110 115 120 125 130 135...

Page 141: ...Remove pressure measuring device and replace 1 8 in pipe plug and screw cap 11 Turn main gas valve to ON position and check heating operation Main Burners For all applications main burners are factory...

Page 142: ...142 A48 3733 Fig 56 Main Burner Removal...

Page 143: ...ide Air Enthalpy OAE 62 93 OA D T OutsideAir Dewpoint Temp dF OADEWTMP 62 93 COOL COOLING INFORMATION C CAP Current Running Capacity CAPTOTAL 40 43 92 94 CUR S Current Cool Stage COOL_STG 40 92 94 REQ...

Page 144: ...e Disable YES NO UNITSTOP config 23 25 27 S STP Soft Stop Request YES NO SOFTSTOP forcible 23 25 FAN F Supply Fan Request YES NO SFANFORC forcible 23 25 F 4 CH 4 in Filter Change Mode YES NO FILT4CHG...

Page 145: ...Sw Temp dF LIMSWTMP REF T REFRIGERANT TEMPERATURES SCT A Cir A Sat Condensing Tmp 40 240 dF SCTA SST A Cir A Sat Suction Temp 40 240 dF SSTA SCT B Cir B Sat Condensing Tmp 40 240 dF SCTB SST B Cir B...

Page 146: ...OFF CSB_B2 STAT THERMOSTAT INPUTS G Thermostat G Input ON OFF G forcible W1 Thermostat W1 Input ON OFF W1 forcible W2 Thermostat W2 Input ON OFF W2 forcible Y1 Thermostat Y1 Input ON OFF Y1 forcible Y...

Page 147: ...le E PWR Economizer Power Relay ON OFF ECON_PWR forcible GEN O GENERAL OUTPUTS ALRM Remote Alarm Aux Relay ON OFF ALRM forcible ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT PAGE NO UNIT UNIT CONFIGURA...

Page 148: ...put Enable Disable EDTRSENS Disable 21 30 33 98 HEAT HEATING CONFIGURATION HT CF Heating Control Type 0 4 HEATTYPE 0 48 49 50 53 71 HT SP Heating Supply Air Setpt 80 120 dF SASPHEAT 85 48 OC EN Occupi...

Page 149: ...T24 Test Maximum Pos 50 100 T24TSTMX 85 60 61 SAT T SAT Settling Time 10 900 sec SAT_SET 240 60 61 BP BUILDING PRESS CONFIG BP CF Building Press Config 0 3 BLDG_CFG 0 22 62 64 BP RT Bldg Pres PID Run...

Page 150: ...5 60 min IAQPTIME 15 68 69 IQ P L IAQ Purge LoTemp Min Pos 0 100 IAQPLTMP 10 68 69 IQ P H IAQ Purge HiTemp Min Pos 0 100 IAQPHTMP 35 68 69 IQ L O IAQ Purge OAT Lockout 35 70 dF IAQPNTLO 50 68 69 DEHU...

Page 151: ...SAT_TRIM 0 75 RAT T RAT Trim 10 10 F RAT_TRIM 0 75 OAT T OAT Trim 10 10 F OAT_TRIM 0 75 SPT T SPT Trim 10 10 F SPT_TRIM 0 75 CTA T Cir A Sat Cond Temp Trim 30 30 F SCTATRIM 0 75 CTB T Cir B Sat Cond T...

Page 152: ...N Duration Days 0 99 HOL_LEN1 78 Repeated for holidays 2 30 DAY S DAYLIGHT SAVINGS TIME DS ST DAYLIGHT SAVINGS START ST MN Month 1 12 STARTM 4 78 ST WK Week 1 5 STARTW 1 78 ST DY Day 1 7 STARTD 7 78 M...

Page 153: ...Timeguard CMPA1_TG Compressor A2 Relay CMPA2 Compressor A2 Feedback CSB_A2 Compressor A2 Timeguard CMPA2_TG Minimum Load Valve MLV Cir A Discharge Pressure PSIG DP_A Cir A Suction Pressure PSIG SP_A...

Page 154: ...guard HS2_TG Heat Stage 3 Timeguard HS3_TG Heat Stage 4 Timeguard HS4_TG Heat Stage 5 Timeguard HS5_TG Heat Stage 6 Timeguard HS6_TG HMZR HVAC Mode Ascii text strings Humidimizer Capacity 0 100 HMZRCA...

Page 155: ...Input On Off Y1 forcible Thermostat Y2 Input On Off Y2 forcible Thermostat W1 Input On Off W1 forcible Thermostat W2 Input On Off W2 forcible Thermostat G Input On Off G forcible UINPUTS Filter Statu...

Page 156: ...EXV HEATING Heat Relay 1 On Off HS1 Heat Relay 2 On Off HS2 Relay 3 W1 Gas Valve 2 On Off HS3 Relay 4 W2 Gas Valve 2 On Off HS4 Relay 5 W1 Gas Valve 3 On Off HS5 Relay 6 W2 Gas Valve 3 On Off HS6 Heat...

Page 157: ...tion Software Part Number CESR131343 XX XX Model Number Serial Number Reference Number HOLIDAY Broadcast Supervisory HOLDY01S Holiday Start Month 1 12 HOL MON 0 to Start Day 1 31 HOL DAY 0 HOLDY30S Du...

Page 158: ...c 40 245 dF SALO 40 EDT hi alert limit occ 40 245 dF SAHO 100 EDT lo alert limit unocc 40 245 dF SALU 40 EDT hi alert limit unocc 40 245 dF SAHU 100 RAT lo alert limit occ 40 245 dF RALO 60 RAT hi ale...

Page 159: ...n Rate 5 120 secs MM_RATE 5 DEHU Dehumidification Config 0 2 DHSELECT 0 Dehumidification Sensor 1 2 DHSENSOR 1 Econ disable in DH mode Yes No DHECONEN No Vent Reheat Setpt Select 0 1 DHVHTCFG 0 Vent R...

Page 160: ...Reset Input Enable Disable EDTRSENS Disable HEAT Heating Control Type 0 4 HEATTYPE 0 Heating Supply Air Setpt 80 120 dF SASPHEAT 85 Occupied Heating Enabled Yes No HTOCCENA No MBB Sensor Heat Relocat...

Page 161: ...pt Clean Open Close FLTSLOGC Open IGC Feedback Off Open Close GASFANLG Open RemSw Off Unoc Strt NoOv Open Close RMTINLOG Open Economizer Switch No Open Close ECOSWLOG Open Fan Status Sw Off Open Close...

Page 162: ...ascii Active Alarm ascii ALARM_03 ascii Active Alarm ascii ALARM_04 ascii follow same format for ALARMS02 ALARMS03 ALARMS04 ALARMS05 COMPRESR Compressor A1 Relay On Off CMPA1 Compressor A1 Feedback On...

Page 163: ...Air Quality in PPM DAQ Econo Position Override ECOORIDE forcible IAQ Min Pos Override IAQMINOV forcible Econ Remote 10K Pot Val ECON_POT forcible IAQ PPM Return CO2 IAQ forcible OAQ PPM Return CO2 OAQ...

Page 164: ...mizer Control Point dF ECONCPNT EDT Trend in degF minute F EDTTREND Economizer Prop Gain EC_PGAIN config Economizer Range Adjust F EC_RANGE config Economizer Speed Adjust EC_SPEED config Economizer De...

Page 165: ...EADCV Supply Air Reset On Off MODESARS Demand Limit in Effect On Off MODEDMLT Temp Compensated Start On Off MODETCST IAQ pre occ purge active On Off MODEIQPG Linkage Active DAV On Off MODELINK Mech Co...

Page 166: ...Threshold Adding Z_PLUS High Temp Cap Override On Off HI_TEMP Low Temp Cap Override On Off LOW_TEMP Pull Down Cap Override On Off PULLDOWN Slow Change Cap Override On Off SLO_CHNG SYSTEM Reset All Cu...

Page 167: ...er Position Test ECONCTST test Economizer Power Test ECONPTST test Calibrate the Economizer ECON_CAL test Power Exhaust Relay A PE_A_TST test Power Exhaust Relay B PE_B_TST test Power Exhaust Relay C...

Page 168: ...ring the off mode and is stopped by driving the speed to 0 by sending a 4 mA signal to the VFD The A Series units use ABB VFDs The interface wiring for the VFDs is shown in Fig A The VFD connects thro...

Page 169: ...ers are set a The Carrier Assistant will ask Is this an Air Handler or Rooftop Select Rooftop b The Carrier Assistant will ask Is this a High E or Premium E motor Select the correct efficiency type c...

Page 170: ...ower middle displays the current time if configured to show the time The first time the drive is powered up it is in the OFF mode To switch to local hand held control and control the drive using the c...

Page 171: ...ACKUP on the display screen and press ENTER SOFT KEY 2 4 Use the UP or DOWN keys to highlight DOWNLOAD TO DRIVE ALL and press SEL SOFT KEY 2 5 The text Restoring Parameters will be displayed with a pr...

Page 172: ...el is not touched and the fault is still active ALARMS GREEN LED FLASHING For less severe errors called alarms the diagnostic display is advisory For these situations the drive is simply reporting tha...

Page 173: ...002 MAXIMUM SPEED parameters Check parameter settings for 2001 and 2002 Check adequacy of motor braking torque Check applicability of torque control Check brake chopper and resistor 25 RESERVED Not us...

Page 174: ...ure feedback This alarm warns that a Motor Overload fault trip may be near Check for overloaded motor Adjust the parameters used for the estimate 3005 through 3009 Check the temperature sensors and Gr...

Page 175: ...late air inside the enclosure To replace the internal enclosure fan for frame sizes R1 to R4 perform the following see Fig F 1 Remove power from drive 2 Remove the front cover 3 The housing that holds...

Page 176: ...176 APPENDIX C VFD INFORMATION cont Fig F Internal Enclosure Fan Replacement A48 7716...

Page 177: ...ating cooling HVAC modes HVAC mode Off The unit is off and no operating modes are active HVAC mode Tempering Vent The economizer is at minimum vent position but the supply air temperature has dropped...

Page 178: ...the Ones 1 s switch to 5 BACNET DEVICE INSTANCE ADDRESS The UPC Open controller also has a BACnet Device Instance address This Device Instance MUST be unique for the complete BAC net system in which...

Page 179: ...troller communicates using BACnet on an MS TP network segment communications at 9600 bps 19 2 kbps 38 4 kbps or 76 8 kbps Wire the controllers on an MS TP network segment in a dai sy chain configurati...

Page 180: ...N Cable Single twisted pair low capacitance CL2P 22 AWG 7x30 TC foam FEP plenum rated cable Conductor 22 or 24 AWG stranded copper tin plated Insulation Foamed FEP 0 015 in 0 381 mm wall 0 060 in 1 52...

Page 181: ...tion and User Guide for instruc tions on connecting and using the BACview6 device To order a BACview6 Handheld BV6H consult Commer cial Products i Vu Open Control System Master Prices WIRING SPECIFICA...

Page 182: ...000 hours of data retention during power outages Remove the battery from the controller making note of the battery s polarity Insert the new battery matching the battery s polarity with the polarity i...

Page 183: ...1600 suction_press_a_1 Cir B Discharge Pressure DP_B R psig n a n a AV 1605 discharge_press_b_1 Cir B Sat Condensing Temperature SCTB R F n a n a AV 1606 sat_cond_temp_b_1 Cir B Sat Suction Temperatu...

Page 184: ...an On Setpoint DAQFNON W n a 400 0 2000 AV 46 daqfnon_1 DBC OAT Lockout DBC_STAT R n a n a n a BV 25 dbc_stat_1 DCV Resetting Min Pos MODEADCV R n a n a n a BV 26 modeadcv_1 DDBC OAT RAT Lockout DDBCS...

Page 185: ...smk_evac_1 Evaporator Discharge Tmp EDT R F n a n a AV 76 edt_1 Exhaust Fan VFD Speed EFAN_VFD R n a n a AV 2075 ef_vfd_output_1 Fan Fail Shuts Down Unit SFS_SHUT W n a 0 0 1 BV 50 sfs_shut_1 Fan Mode...

Page 186: ...RD R n a n a n a BV 60 bplpovrd_1 Low Temp Cap Override LOW_TEMP R n a n a n a BV 61 low_temp_1 Maximum Heat Stages HTMAXSTG R n a n a n a AV 107 htmaxstg_1 Mech Cooling Locked Out MODELOCK R n a n a...

Page 187: ...W F n a 280 AV 135 rat_1 Schedule Number SCHEDNUM W n a 0 0 99 AV 136 schednum_1 Slow Change Cap Override SLO_CHNG R n a n a n a BV 86 slo_chng_1 Smoke Purge Input PURG W n a n a 0 1 BV 1062 smk_purg_...

Page 188: ...stat Y2 Input Y2 W n a n a 0 1 BV 1018 y2_input_1 Timed Override In Effect MODETOVR R n a n a n a BV 97 modetovr_1 Timed Override in Effect OVERLAST R n a n a n a BV 98 overlast_1 TSTAT Both Heat and...

Page 189: ...TPMAX W 100 0 100 AV 188 statpmax_1 VFD Minimum Speed STATPMIN W 20 0 100 AV 189 statpmin_1 VFD Act Fire Speed Pos BLDGPFSO W 100 0 100 AV 186 bldgpfso_1 BP Building Pressure CEM Controls Expansion Mo...

Page 190: ...ose the head pressures are converted to saturated condensing temperatures SCTs as the feedback information to the con denser fans also referred to as outdoor fans SCT Ais the sat urated condensing tem...

Page 191: ...191 APPENDIX F OPTIONAL LOW AMBIENT MOTORMASTER V CONTROL cont Fig N Low Ambient MMV Control Location 48 50A040 050 Units...

Page 192: ...192 APPENDIX F OPTIONAL LOW AMBIENT MOTORMASTER V CONTROL cont Fig O Low Ambient MMV Control Location 48 50A060 RTPF Units...

Page 193: ...de run compressor no 1 The Motor master V electronic control adjusts the fan speed based on the liquid line pressure input Ensure that fans are rotating clock wise as viewed from above If rotation is...

Page 194: ...of 1 0 Motormaster Integration Time MM TI MM_TI This is the integration time constant for the Motor master control PD control loop This value shall have a range of 0 5 to 50 and default of 30 Motorma...

Page 195: ...ition is repaired regardless of the OAT and SCT values START UP The Motormaster V electronic control will be powered up as long as unit voltage is present When the system calls for cooling the Motorma...

Page 196: ...WN buttons and then storing the value by pressing MODE 5 Press MODE again to re display the value of P48 6 Change the value of P48 to the desired factory default mode using UP and DOWN buttons then pr...

Page 197: ...rcent of rated output voltage P54 LOAD in percent of drives rated output current P55 VDC INPUT in percent of maximum input 100 will indicate full scale which is 5 v P56 4 20 mAINPUT in percent of maxi...

Page 198: ...60 60 50 P28 Fixed boost 0 5 at low frequencies 0 5 0 5 0 5 P29 Accel boost 0 0 0 0 P30 Slip compensation 0 0 0 0 P31 Preset spd 1 speed if loss of control signal 57 57 47 P32 Preset spd 2 0 0 0 0 P33...

Page 199: ...on of the EPM to match the parameter version of the drive F1 EPM Fault Manual The EPM is missing or dam aged Install EPM or replace with new EPM F2 F9 Fo Internal Faults Manual The control board has s...

Page 200: ...lve adjustment 48A only 141 Generics table 7 Head pressure control 43 Heat mode diagnostic help 49 Heat mode selection process 48 Heating 23 Heating control 47 Humidi MiZer 23 71 Troubleshooting 79 Ho...

Page 201: ...0 MAT S MAT Calc Config 0 2 multi text strings 1 MAT R Reset MAT Table Entries Yes No No MAT D MAT Outside Air Default 0 100 20 ALTI Altitude in feet 0 60000 0 DLAY Startup Delay Time 0 900 sec 0 STAT...

Page 202: ...AP M Max Cap Change per Cycle 5 45 45 M R DB S Gas DB min dF PID Rate 0 5 0 5 S G DB St Gas Temp Dead Band 0 5 F 2 RISE Heat Rise dF sec Clamp 0 05 0 2 0 06 LAT L LAT Limit Config 0 20 F 10 LIM M Limi...

Page 203: ...ime 0 720 min 120 FC L O Un Ec Free Cool OAT Lock 40 70 dF 50 T 24 C TITLE 24 FDD LOG F Log Title 24 Faults Yes No No EC MD T24 Econ Move Detect 1 10 dF 1 EC ST T24 Econ Move SAT Test 10 20 10 S CHG T...

Page 204: ...20ma Sensor Config 0 2 multi text strings 0 AQ SP AIR QUALITY SETPOINTS IQ O P IAQ Econ Override Pos 0 100 100 DAQ L Diff Air Quality LoLimit 0 1000 100 DAQ H Diff Air Quality HiLimit 100 2000 700 D F...

Page 205: ...R RH H RARH high alert limit 0 100 100 SP L SP low alert limit 0 5 H2O 0 SP H SP high alert limit 0 5 H2O 2 BP L BP lo alert limit 0 25 0 25 H2O 0 25 BP H BP high alert limit 0 25 0 25 H2O 0 25 IAQ H...

Page 206: ...N WHEELS AND PROPELLERS FOR LOCATION IN HOUSING ORIFICE AND SETSCREW IS TIGHT VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED VERIFY THAT SUCTION DISCHARGE AND LIQUID SERVICE VALV...

Page 207: ...MANIFOLD PRESSURE STAGE NO 1 ___________IN WG STAGE NO 2 __________IN WG 48A ONLY REFRIGERANT SUCTION CIRCUIT NO 1 __________PSIG CIRCUIT NO 2__________ PSIG REFRIGERANT DISCHARGE CIRCUIT NO 2 ______...

Page 208: ...ange at any time specifications or designs without notice and without incurring obligations Catalog No 04 53480166 01 Printed in U S A Form 48 50A 13T Pg CL 8 2 18 Replaces 48 50A 12T Carrier Corporat...

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United Technologies Carrier Weathermaker 48A2, Controls, Start-Up, Operation, Service, And Troubleshooting

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