CaptiveAire DOAS RTU Series Installation, Operation And Maintenance Manual Download Page 134

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Summary of Contents for DOAS RTU Series

Page 1: ...contaminants to be recirculated into the supply airstream Accepting and operating this unit with or without the energy recovery wheel in operation increases the risk of airborne bacteria virus and con...

Page 2: ...2...

Page 3: ...re 79 Start Up Procedure Heating 80 Furnace Start Up Summary 80 High Fire Burner Adjustment 80 Low Fire Burner Adjustment 81 Final Start Up Procedure 81 Sequence of Operation 82 Operation Summary Gas...

Page 4: ...R shall pay all labor costs incurred in connection with such repair or replacement Equipment shall not be returned without MANUFACTURER S prior authorization and all returned equipment shall be shippe...

Page 5: ...to prevent accidental contact or damage Provide clearance around the installation site to safely rig and lift the equipment into its final position onto adequate supports Refer to the manufacturer s e...

Page 6: ...ply sides Size 1 2 and 3 units should have 3 feet of clearance on the condensing coil side and size 4 units should have 4 feet Clearance above condenser fans should be at least 10 feet Refer to Figure...

Page 7: ...ERV units should have 3 feet of clearance on the condensing coil side and size 4 ERV units should have 4 feet Clearance above condenser fans should be at least 10 feet Refer to Figure 2 for clearance...

Page 8: ...in unit dropping and possibly crushing operator technician which could result in death or serious injury and possible equipment or property only damage Figure 3 Rigging Size 2 Unit Shown WARNING Ensur...

Page 9: ...nts Verify duct connection and unit supply outlet are properly aligned and sealed Use gasket between the curb and unit Figure 4 The curb and unit must be level or the unit may leak or be damaged If ne...

Page 10: ...k Side Discharge Duct Install refer to Figure 5 Detail B Mount ductwork to the lip of the side discharge opening Use self tapping screws to secure ductwork Verify the ductwork is clear for opening the...

Page 11: ...ble 4 on page 12 for Bill of Materials and curb dimensions Use 1 4 20 x 5 8 Phillips pan head screws and nuts when assembling duct hangers refer to Figure 8 on page 12 Figure 6 Standard Curb Figure 7...

Page 12: ...2 RTU2DHD Quantity x 2 RTU3DHD Quantity x 2 RTU4DHD Quantity x 2 Table 4 Duct Hanger Curb Dimensions Reference Size 1 Size 2 Size 2 ERV Size 3 Size 3 ERV Size 4 Size 4 ERV A 12 3 4 12 1 4 18 16 5 8 17...

Page 13: ...irflow is laminar and consistent 3 Connect the high side tubing to the static pitot tube 4 Route the tubing through the bottom of the unit to the high side port on the pressure transducer 5 The low si...

Page 14: ...14 Typical Submittal Drawing...

Page 15: ...led piping The high efficiency furnace drain Figure 10 detail B is fitted with a condensation float switch assembly located in the bottom main cabinet from the factory A condensation drain must be fie...

Page 16: ...drain pan connection Use low profile couplings and 1 PVC piping to connect on site drainage to the Condensate Trap Assembly DO NOT USE UNIONS The Condensate Trap Assembly is important for two reasons...

Page 17: ...ne to remove debris before making connections Purge line to remove air before attempting to start unit Purging air from gas lines should be performed as described in ANSI Z223 1 latest edition Nationa...

Page 18: ...ches WC Maximum Maximum Manifold Pressure Propane LP 10 Inches WC Maximum Minimum Manifold Pressure Natural Gas 0 15 Inches WC Maximum Minimum Manifold Pressure Propane LP 0 75 Inches WC Maximum 1 Gas...

Page 19: ...0 144 000 2 35mm 3 000 3 999 460 797 35 368 640 2 35mm 276 480 184 320 138 240 2 3mm 4 000 4 999 442 668 36 353 894 2 3mm 265 421 176 947 132 710 43 5 000 5 999 424 668 36 339 739 43 254 804 169 869 1...

Page 20: ...999 530 482 47 442 668 353 894 265 421 176 947 47 5 000 5 999 509 608 47 424 668 339 739 254 804 169 869 47 6 000 6 999 489 224 48 407 680 326 149 244 612 163 075 48 7 000 7 999 469 654 48 391 372 31...

Page 21: ...ting of that system at test pressures in excess of 1 2 psi The equipment must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing o...

Page 22: ...ows and all doors between the space where the appliance is located and other spaces of the building Turn on any exhaust fans so that they will operate at maximum speed If it is believed sufficient com...

Page 23: ...itiate a heating cycle Check inlet and manifold gas pressures 13 A label is included in this kit to attach to the manifold indicating this assembly has been converted to LP gas 14 Attach label to mani...

Page 24: ...ring requirements It is important to run the main electrical wires in a separate conduit from the remote control HMI wiring The HMI wiring is Cat 5 and must be separate from power cable Maximum distan...

Page 25: ...the fan in the space Avoid thermostat installations in direct sunlight near HVAC supplies or abnormal temperature airstreams BK BK BK BK BK BK GR 208 460 600 V 3 PH Size 3 Unit Shown Safety Disconnec...

Page 26: ...tomatic operation Multiple HMIs can be connected to one unit for temperature and R H averaging All combination temperature humidity HMIs will use a vented standoff Mount the static pressure tube close...

Page 27: ...N 01 RD GR J33 2 3 1 BC BP MT 08 BK WH MB BK RD BK RD BK RD DISCHARGE OUTDOOR RETURN SN 04 RD BK SN 03 RD BK SN 02 RD BK P1 P2 H N N 1 J25 3 DDC MODBUS J38 3 1 120V BP BC HMI J2 H N BP BC RD BL BK WH...

Page 28: ...his will reduce the noise being radiated in other equipment ATTENTION Do not connect incoming AC power to output terminals U V W Severe damage to the drive will result Input power must always be wired...

Page 29: ...value P108 is calculated as Motor FLA x 100 Drive Output Rating available in Table 12 on page 30 To enter the PROGRAM mode to access the parameters 1 Use the buttons on the VFD screen Figure 17 to ad...

Page 30: ...XB571 240V X 59 54 90 1 ESV751N04TXB571 480V X 2 5 2 1 15 1 5 ESV112N04TXB571 480V X 3 6 3 15 2 ESV152N04TXB571 480V X 4 1 3 5 15 3 ESV222N04TXB571 480V X 5 4 4 8 15 5 ESV402N04TXB571 480V X 9 3 8 2 1...

Page 31: ...S SLAVE HMI VFD MASTER POWER VENT POWER C34 HOT RN8 AC LINE VOLTAGE AC LINE VOLTAGE AIR FLAME 8 K23 PROV 1 K22 R147 J12 FSC RESET R148 HITEMP LIM PROG R167 FSC1 FSC1 TH W PSW R171 PSW TH W U64 BAS STA...

Page 32: ...24VAC Input from IND on FSC Pin 4 24VAC Input from V1 on FSC Pin 5 24VAC Output to Main Gas Valve Connected to J7 4 Pin 6 0 10VDC Analog Output to Modulating Gas Valve Pin 7 0 10VDC Output to Modulat...

Page 33: ...SC Pin 12 24VAC Supply Power R on FSC Pin 13 24VAC Output to High Limit Switch Pin 14 24VAC Output to Vent Proving Switch Pin 15 Detects 24VAC Presence from Roll Out Switch Pin 16 Detects 24VAC Presen...

Page 34: ...Input from Air Quality Sensor Pin 7 24VAC Common to Air Quality Sensor Pin 8 24VAC Common to Air Quality Sensor Connector J13 contains low voltage connections Pin 1 N A Pin 2 PWM Output for Supply EC...

Page 35: ...Input Pin 4 Return Temperature Thermistor Input Pin 5 Outdoor Temperature Thermistor Input Pin 6 Outdoor Temperature Thermistor Input Pin 7 Discharge Temperature Thermistor Input Pin 8 Discharge Temp...

Page 36: ...ut from DX Float Switch Pin 12 24VAC Input from Door Interlock Pin 13 24VAC Warm Liquid Bypass Output Common Pin 14 24VAC for Damper Actuator Connector J17 Output for Power Vent 1 Connector J19 Output...

Page 37: ...nector J28 contains low voltage screw terminal connections Pin 1 24VAC Output Pin 2 24VAC Output Pin 3 24VAC Digital Input Pin 4 24VAC Common Pin 5 24VAC Output to Supply Fan Pin 6 0 10VDC Analog Inpu...

Page 38: ...nalog Input from Discharge RH Sensor Pin 9 24VDC 0 10VDC Common from Discharge RH Sensor Pin 10 24VDC output to Return RH Sensor Pin 11 0 10VDC Analog Input from Return RH Sensor Pin 12 24VDC 0 10VDC...

Page 39: ...log Output Pin 18 0 10VDC Analog Output for Electric heat Connector J33 contains inputs and outputs for components Pin 1 24VDC Output for Main Unit Current Sensor Pin 2 24VDC Output for Cooling Curren...

Page 40: ...Switch Pin 7 24VAC Output to Oil Sensor Pin 8 24VAC Common from Oil Sensor Pin 9 24VAC Input from Oil Sensor Pin 10 24VDC output to Liquid Line Pressure Transducer Pin 11 0 10VDC Analog Input from Liq...

Page 41: ...us Ground Dip Switch S1 Switch 1 2 3 always OFF Switch 4 Always ON If Switch 4 is OFF BAS terminals disabled Dip Switch S2 Programming Service Only Dip Switch S3 End of line termination Dip Switch S4...

Page 42: ...J11 4 on the MUA board 24V AC common from a rooftop unit should be field wired to terminal block J11 8 on the MUA board When these terminals are powered cooling will be locked out on the RTU Electric...

Page 43: ...signal to modulating furnace controls modulating gas valve and 24V AC signals to staged furnace controls 11 Flame Safety Control FSC 01 Initiates and monitors flame Equipped with non adjustable time...

Page 44: ...44 Figure 20 Typical Refrigerant Access Panel Heat Pump with Reheat shown 14 4 10 2 5 8 11 6 7 12 9 3 1 13 15 Discharge Line 16...

Page 45: ...he preset value the compressor will shut down 8 Discharge High Pressure Transducer PS 22 Pressure transducer that monitors the high side of the refrigeration system 9 Reheat Coil Check Valve Restricts...

Page 46: ...he amount of gas to the furnace to meet desired discharge space temperature 6 ON OFF Gas Valve VA 01 On Off gas valve with built in regulator and manual shut off switch 7 Low Pressure Gas Switch PS 04...

Page 47: ...ng mode after ignition has commenced This sensor is wired to the Flame Safety Control FSC 1 5 Rollout Switch 2 SW 13 Normally closed temperature activated switch Mounted on bracket at the firing tube...

Page 48: ...behind door Main supply air motor 3 Discharge Temperature Sensor or Discharge Humidity Temperature SN xx Monitors discharge air temperature or humidity temperature 4 Door Tamper Switch SW 19 When the...

Page 49: ...conjunction with a proportional thermostat not shown A sensor is mounted in the blower housing for discharge control The set point is mounted remotely for either space control or discharge control 3...

Page 50: ...compressor will shut down The minimum maximum speed for the compressor is 1500 RPM 50 Hz 6000 RPM 200Hz Oil level sensor This sensor is an optical sensor that monitors the compressor s internal oil le...

Page 51: ...proves efficiency of the compressor at all running speeds Control parameters are factory preset but are accessible on the parameter list as read only values Oil level sensor This sensor Figure 27 is a...

Page 52: ...s to locate the parameters that will need to be adjusted CDS803 Main Menu Navigation Main Menu is used for access to and programming of all parameters The Main Menu parameters can be accessed readily...

Page 53: ...locate the parameters that will need to be adjusted CDS302 303 Main Menu In the Main menu mode the parameters are divided into groups Use the navigation keys for selecting a parameter group After sele...

Page 54: ...The parameters are factory configured to the specific application Parameters may need to be modified to fine tune automatic operation after the original setup Remote HMI Control Panel On units shipped...

Page 55: ...o EVEN Advanced Options Under advanced options the user may adjust the following settings Contrast The user may adjust the setting from 0 to 10 Setting the contrast to 0 is the lowest setting availabl...

Page 56: ...desired temperature settings When in the UNOCCUPIED setting the system will run at the unoccupied temperature setting Fan Speed and Damper Position Presets Table 13 outlines the aux pins on Connector...

Page 57: ...hree occupied time periods If the time is scrolled past 11 59 pm it will display UNOCC Copy Schedule This will allow the user to copy an existing schedule from one day of the week to individual days i...

Page 58: ...ied and unoccupied preferences Construction Mode Configurable option for units used in construction settings Heating Config Allows the user to set various heating configurations Heating Type Selectabl...

Page 59: ...mp will shut off at the set maximum temperature The default temperature setting is 75 F Superheat Monitors what state the refrigerant is in as it leaves the evaporator coil The superheat default setti...

Page 60: ...is set to 5 F and the reheat set points dew point is set to 50 F the unit will cool the air to 45 F before reheating Low Load When On if the unit is only dehumidifying and heating shuts cooling down t...

Page 61: ...l run to return oil back to the compressor before shutting down EEV Config Allows user to set Electronic Expansion Valve EEV model and adjust EEV position values EEV Model Selectable range of EEV mode...

Page 62: ...heel speed setting Off Time Time setting the ERV cannot activate into a defrost cycle after a cycle has completed Speed Adjustable speed which the user may set the enthalpy wheel speed during defrost...

Page 63: ...o Off the menu screen for the blower mode will allow you to choose MANUAL AUTO OFF In blower auto mode the blower will only run when it gets a call for heating cooling In blower on mode the blower wil...

Page 64: ...uire a space sensor or HMI This setting will use the return air thermistor RT in place of the space Outdoor Air Limits Minimum and maximum settings for mixing box Percentage or voltage based on mixing...

Page 65: ...by the offset When cooling If the measured outside air temperature is above the Dynamic Cool OA set point minus the differential set point the space or discharge set point will increase decrease by th...

Page 66: ...egin at 0 volts The up and down buttons allow for modulation of input Test Analog Cooling This test will simulate a voltage input from a BMS system The test will begin at 0 volts The up and down butto...

Page 67: ...C RANGE 55 120 F 10 32 C DEFAULT 74 F 23 C USER SETTINGS TEMP SET POINTS DISCHARGE SET POINTS HEAT OCC UNOCC COOL OCC UNOCC RANGE 40 150 F 4 66 C DEFAULT 80 F 27 C RANGE 40 80 F 4 26 C DEFAULT 55 F 13...

Page 68: ...T 50 OA RESET LOW OA RESET HIGH RANGE 35 110 F 7 43 C DEFAULT 45 F 7 C RESET LOW RANGE 35 110 F 7 43 C DEFAULT 75 F 7 C RESET HIGH RESET HEAT DISCHARGE RESET COOL DISCHARGE RANGE 40 150 F 4 65 C DEFAU...

Page 69: ...NGE 40 150 F 4 66 C DEFAULT 90 F 13 C RANGE 35 110 F 2 43 C DEFAULT 45 F 7 C CO2 CONTROL CONFIG PPM LOW OCC UNOCC RANGE 0 PPM PPM HIGH DEFAULT 500 PPM PPM HIGH OCC UNOCC RANGE PPM LOW 2 000 PPM DEFAUL...

Page 70: ...POWERVENT CONFIG TRIAC MOD PV ON OFF PWM MODE FURNACE FLOAT ON OFF DEFAULT OFF RCT 2 3 RANGE 30 600 S DEFAULT VARIES HIGH TURNDOWN ENABLE ON OFF DEFAULT OFF MODE MANUAL OA TEMP DIFF DEFAULT OA TEMP D...

Page 71: ...N OFF DEFAULT OFF REHEAT VALVE MODEL MODEL MTW DEFAULT MTW REHEAT OPTIMIZATION ENABLE ON TIME ON OFF DEFAULT OFF RANGE 1 10 M DEFAULT 3 M OFF TIME RANGE 1 10 M DEFAULT 3 M SUPERHEAT SET POINT SP RANGE...

Page 72: ...UAL DEFAULT AUTO MONITORING SENSORS DOOR INTERLOCK ON OFF DEFAULT ON CLOG FILTER RANGE 0 2 DEFAULT 0 25 CLOG WHEEL RANGE 0 3 DEFAULT 0 25 FRST WHEEL RANGE 0 2 DEFAULT 0 4 EXH AIR PS RANGE 0 0 0 5 DEFA...

Page 73: ...AULT 8 V S PS HYST RANGE 0 100 DEFAULT 25 DEFROST CONTROL MODE OA TEMP SP EA TEMP SP RA RH SP TEMP RH OFF DEFAULT OFF RANGE 40 60 F DEFAULT 0 F RANGE 40 60 F DEFAULT 35 F RANGE 0 100 DEFAULT 30 ON TIM...

Page 74: ...OG VFD 0 10V VFD PRESSURE ECM ECM 0 10V ECM PRESSURE BLOWER MODE AUTO DEFAULT INTERLOCK MANUAL OCC UNOCC AIRFLOW PROVING CONTROL ONBOARD REMOTE DEFAULT ONBOARD PS SET POINT RANGE 0 5 0 25 w c DEFAULT...

Page 75: ...0 0 PRESET 1 80 PRESET 2 90 PRESET 3 100 PRESET 4 0 PRESET 5 0 PRESET 6 0 PRESET 7 0 PWM PRESETS DEFAULT OCC PWM PRESETS RANGE 0 100 DEFAULT VARIES UNOCC PWM PRESETS RANGE 0 100 DEFAULT VARIES PRESET...

Page 76: ...PRESSURE RETURN AS SPACE ON OFF DEFAULT OFF OUTDOOR AIR LIMITS RANGE 0 MAX OA DEFAULT 0 MIN OCC UNOCC MAX OCC UNOCC RANGE MIN OA 100 DEFAULT 100 RANGE 0 MAX OA V DEFAULT 0V MIN V OCC UNOCC MAX V OCC U...

Page 77: ...ODE OUTDOOR RESET ENABLE ON OFF DEFAULT OFF DD WHEEL SIZE SIZE MODELS 11 13 15 18 20 24 30 36 16Z 18Z 20Z 22Z 25Z 28Z DYNAMIC SET POINT ENABLE ON OFF DEFAULT OFF CO2 CONTROL CONFIG OVERRIDE OFF DEFAUL...

Page 78: ...CFM ENTER OUTDOOR AIR VALUES DISPLAYS OUTDOOR VALUES REFRIDGE DIAG COMPONENT VALUES OF REFRIGERANT COMPONENTS ERV DIAGNOSTICS MONITORS ERV PERFORMANCE TEMP RH and PRESSURE VALUES TEST MENU OFF ALL SU...

Page 79: ...nsation Drain on page 15 5 Compare the supplied motor voltage with the fan s nameplate voltage If this does not match correct the problem 6 Check the rotation of the wheel motor Verify the wheel is mo...

Page 80: ...on page 46 Go to Service Test Menu Test Gas Heat Run High Fire Test 2 After it has been verified that the furnace s are lighting off properly the manifold gas pressure should be adjusted to jobsite c...

Page 81: ...g by simultaneously holding down buttons 1 and 2 until the blinking LED turns off Press the abort button on the HMI to exit low fire mode Final Start Up Procedure 1 With the air and burner systems in...

Page 82: ...valve NOTE If a high turndown furnace is present this sequence occurs with FSC 2 if the call for heat dictates a need for a second furnace There are different options for controlling the temperature o...

Page 83: ...es differently than other On Off staged furnaces Instead of being On or Off the gas flow to this furnace is modulated up and down to account for varying calls for heat during the unit s operating peri...

Page 84: ...ing device to select closed position or 100 open The control board sends out a constant 10V DC signal to the actuator The field supplied switch will break or make the signal from the control board to...

Page 85: ...Electronic Expansion Valve EEV reducing its pressure and temperature then passes through a filter drier The filter drier adsorbs water and filters system contaminants As the cool low pressure liquid r...

Page 86: ...ure liquid leaves the outdoor coil and flows through the copper refrigerant line The liquid passes through a filter drier The filter drier adsorbs water and filters system contaminants At the end of t...

Page 87: ...the heating position Hot refrigerant gas is then sent to the indoor coil The outdoor fan operates and the unit is now in normal heating mode Reheat cycle cooling only During the reheat cycle a portio...

Page 88: ...door air temperature is less than the return air temperature The modulation occurs from the current damper position to fully open over a specific temperature range determined by the economizer tempera...

Page 89: ...89 Psychrometric Chart Fixed Dry Bulb Economizer Differential Dry Bulb Economizer Setpoint Temp Economizer Band Low Limit Temp 100 50 0 Outdoor Air Di eren al Dry Bulb Return Temp Min OA Max OA...

Page 90: ...90 Fixed Enthalpy Economizer Differential Enthalpy Economizer Setpoint Temp Economizer Band High Limit DP 100 50 0 Outdoor Air Fixed Total Low Limit DP Setpoint RH Min OA Min OA Max OA...

Page 91: ...rol comprises of starting and stopping the exhaust fan modulating the speed of the exhaust fan starting and stopping the enthalpy wheel and optionally controlling the speed of the enthalpy wheel If re...

Page 92: ...enthalpy wheel the wheel is slowed down so that less enthalpy transfer occurs and frosting of the wheel is avoided Frosting can occur on the enthalpy wheel when the exhaust air leaving the wheel is s...

Page 93: ...can be implemented with this package through a Protocessor which is a BTL listed embedded Gateway configured to give a Building Management System access to monitor and or control a list of BACnet obje...

Page 94: ...address of the Protocessor is 192 168 1 24 Once the landing page has loaded if required log in using admin for the username and password If the default admin password does not work the gateway should...

Page 95: ...he computer used must have a static IP address of 192 168 1 xxx The window shown in Figure 47 appears Click on the Diagnostics and Debugging button on the lower right corner Click on Setup from the le...

Page 96: ...P AV 26 Control Monitor FirestatIntakeSP AV 27 Control Monitor FirestatDischargeSP AV 28 Control Monitor FreezestatSP AV 29 Control Monitor OverheatDischargeSP AV 30 Control Monitor CabinetHeatSP AV 3...

Page 97: ...r BlowerManualPwmRateOcc AV 89 Control Monitor BlowerManualPwmRateUnocc AV 90 Control Monitor MixingBoxManualOAOcc AV 91 Control Monitor MixingBoxManualOAUnocc AV 92 Control Monitor EconomizerTempSPOc...

Page 98: ...Hmi0Temp AI 148 Monitor Only Hmi1Temp AI 149 Monitor Only Hmi2Temp AI 150 Monitor Only Hmi3Temp AI 151 Monitor Only Hmi4Temp AI 152 Monitor Only SuctionLineTemp AI 153 Monitor Only LiquidLineTemp AI...

Page 99: ...Only SchedulingEnabledFlag AV 212 Monitor Only HeatTemperModeOcc AV 213 Monitor Only HeatTemperModeUnocc AV 214 Monitor Only CoolTemperModeOcc AV 215 Monitor Only CoolTemperModeUnocc AV 216 Monitor On...

Page 100: ...ed to hit the Service Pin in the ProtoNode This pin is located in the front face and it can be pressed by inserting a small screwdriver and tilting it towards the LonWorks Port Refer to Figure 49 for...

Page 101: ...ceFloat 69 Fsc2VentProving 116 DnfsDriveInit 23 BlowerVfdMbComm 70 AuxFsc1VentProving 117 DnfsSafeStop 24 DoorInterlock 71 AuxFsc2VentProving 118 DnfsStartFail 25 ScrollDxVfdMbComm 72 LowRefridgePs 11...

Page 102: ...nternal4 162 Vfd571Network1 177 Missing2ndEvapSensor 148 Vfd571Internal5 163 Vfd571Network2 178 Broken2ndEvapSensor 149 Vfd571Internal6 164 Vfd571Network3 179 ErvSupplyMissingFilter 150 Vfd571Internal...

Page 103: ...Inputs Refridge Diag The Refridge Diag menu will display the following WARNING Technicians must be certified by an EPA approved training and certification program to service any HVAC equipment regardl...

Page 104: ...auge set refer to Removing Manifold Gauge Set on page 107 If the readings are incorrect follow the System Troubleshooting Chart on page 108 to locate and repair the problem Recovering Refrigerant from...

Page 105: ...low side service port Connect the yellow service hose to the vacuum pump 2 Connect a micron gauge to the service port located on the leaving side of the outdoor coil refer to Figure 50 3 Place the sys...

Page 106: ...compressor add at least 50 of the charge on the label from the refrigerant cylinder to the system Abort Evacuation Mode 8 Check oil level prior to starting the compressor Refer to Compressor Informat...

Page 107: ...o 0V 4 Monitor the system until the following conditions are met Refer to Table 16 on page 118 to determine subcool Compressor must be running at 100 and condenser fan temperature must be 110 F Subcoo...

Page 108: ...e filters Compressor Verify compressor modulates between Min to Max frequency Electronic Expansion Valve EEV Verify EEV position is 0 when not in heating or cooling under Refridge Diag See Monitoring...

Page 109: ...oad Motor overload has tripped Check motor for debris Check contactor motor wiring connections Check overload reset button Check overload amperage setting Check motor bearings Stat Missing Return Outs...

Page 110: ...y the induced draft air sensor Kinked blocked damaged hose Blockage in vent system Poor venting Check bleed hole in proving switch Clogged condensation drain Power vent motor Failed vent proving switc...

Page 111: ...heck parameters Max Head Pressure The max head pressure for the compressor is too high Refer to Monitoring the A C System on page 103 Check airflow Freezestat lockout optional The discharge temperatur...

Page 112: ...switch Electric Heater Fault Voltage input is lost while the electric heater is active Check electric heater wiring to board connector J7 pin 10 Verify all other wiring is connected properly Check Fus...

Page 113: ...can operate safely at a higher torque Inverter Overload The converter is about to cut out because of an overload The thermal protection issues a warning at 98 and an alarm at 100 This converter canno...

Page 114: ...the frequency converter and mains power supply to the unit Safe Stop Loss of the 24V DC signal on terminal 37 has caused the filter to trip Apply 24V DC to terminal 37 and reset the filter Start Fail...

Page 115: ...128 Faulty reversing valve Test reversing valve Defrost control Test defrost control Compressor cycles on overload Shortage of refrigerant Test for leak Recharge Restricted discharge line Repair or r...

Page 116: ...ct static pressure lower than design Reduce fan RPM Insufficient Airflow Fan rotating in the wrong direction Verify fan is rotating in the direction shown on rotation label Check the fan wiring Check...

Page 117: ...low Increase main gas pressure do not exceed 14 in wc inlet pressure Unit locked into low fire Check wiring or modulating valve settings Refer to Furnace Start Up Summary on page 80 Too much airflow D...

Page 118: ...condensing coil High subcooling means the condenser is flooded Low subcooling means the condenser is starving If the superheat is high and the subcool is low under normal operating conditions the syst...

Page 119: ...s voltage at pin 12 check the adjustment of the switch Clogged Filter Switch Field Adjustment Follow these steps if performing a part replacement or to calibrate the switch Install the switch Install...

Page 120: ...t there may be an issue with transformer High Refrigeration Pressure Switch SW 16 Figure 53 High Refrigeration Pressure Switch 1 If a high pressure switch Figure 53 failure occurred manually reset the...

Page 121: ...ary with compressor speed Figure 54 Compressor Drive Humidity Temperature Sensor Intake HUM 1 Space HUM 2 Discharge HUM 3 Refer to Figure 55 for component locations Check the following 1 Verify the wi...

Page 122: ...3 J15 pin 5 to pin 6 SN 04 J15 pin 7 to pin 8 HUM 2 J15 pin 9 to pin 10 If there is 0 ohms the sensor or wires are shorted If there is infinite OL ohms the sensor or wires are open If the sensor or wi...

Page 123: ...Gas Pressure Switch PS 04 1 Turn the unit ON Verify the inlet pressure gauge is reading the correct pressure Natural gas 7 in w c 14 in w c Propane 11 in w c 14 in w c NOTE If the reading is incorrec...

Page 124: ...nd There should be 24 28V AC If the voltage reading is incorrect check the wiring for an open or short circuit If the wiring check is correct the switch has failed Replace the switch If the voltage re...

Page 125: ...Power 24V DC to H4 Terminal 4 Power to N4 If any damaged wiring is found repair or replace If any open or short circuits are found repair or replace If any wiring is connected incorrectly correct the...

Page 126: ...transformer failure Check circuit breaker Check LED light Thermostat ON no spark Check wiring to thermostat input TH Faulty thermostat Check LED light Blower ON no Trial For Ignition TFI after purge d...

Page 127: ...sition closed Mount the actuator with the counterclockwise CCW out Refer to Figure 64 2 If the universal clamp is not on the correct side of the actuator move it to the correct side 3 Slide the actuat...

Page 128: ...is no damage to the wiring Make sure all connections are secure and connected 2 Use a multi meter to measure the resistance in the electronic expansion valve harness from The black wire to white wire...

Page 129: ...circuit on the five pin connector Check the ground circuit on the three pin connector If there is an issue with the ground circuit repair the circuit If there is not an issue with the ground circuit p...

Page 130: ...hot and may be hot enough to be painful or cause injury All fasteners should be checked for tightness each time maintenance checks are performed prior to restarting unit Fans require very little atte...

Page 131: ...for dirt and bent fins Clean or replace as necessary refer to Coil Cleaning Procedure on page 132 Check the outdoor fans for proper rotation and operation Clean all debris from fan guards Inspect all...

Page 132: ...he system back to service 6 Always clean the following items thoroughly with water once the system is back to service tools sprayer roof nearby areas and equipment that may have come in contact with c...

Page 133: ...1 2 x x x Size 2 x x x 2 Size 3 x 4 x x Size 4 x x 8 x Unit Housing Size 16 x 20 x 2 16 x 25 x 2 Size 2 ERV 4 x Size 3 ERV x 4 Size 4 ERV 8 x Table 18 Internal Filter Quantity Chart Throw Away Unit Ho...

Page 134: ...134 Notes...

Page 135: ...RPM Unit Hertz Ambient Wet Bulb Temp F Unit Phase Ambient Dry Bulb Temp F Unit FLA Cond 1 Suction Pressure PSI Unit Supply HP Cond 1 Suction Temperature F Gas Type Cond 1 Liquid Pressure PSI Min Btu...

Page 136: ...rheat F Field Measured Information Initial Readings Field Measured Information Final Readings Motor Voltage Motor Voltage Motor Amperage Motor Amperage MUA Blower RPM MUA Blower RPM Ambient Wet Bulb T...

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CaptiveAire DOAS RTU Series, Installation, Operation And Maintenance Manual

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