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Carrier 48LC 14, Service And Maintenance Instructions

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Carrier 48LC 14 Service And Maintenance Instructions Download Page 88

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53480153-01

Printed in U.S.A.

Form 48LC-14-26-03SM

Pg CL-2

2-2020

Replaces: 48LC-14-26-02SM

© 2020 Carrier Corporation

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PRESSURES

Gas Inlet Pressure

_____________IN. WG

Gas Manifold Pressure

STAGE 1 _____________IN. WG
STAGE 2 _____________IN. WG

Refrigerant Suction

CIRCUIT A _____________ PSIG 
CIRCUIT B _____________ PSIG

Refrigerant Discharge 

CIRCUIT A _____________ PSIG 
CIRCUIT B _____________ PSIG

Verify Refrigerant Charge using Charging Charts (Y/N) _____

GENERAL

Economizer minimum vent and changeover settings to job requirements (if equipped) (Y/N) _____
Verify smoke detector unit shutdown by utilizing magnet test (Y/N) _____

IV. HUMIDI-MIZER

®

 SYSTEM START-UP

STEPS

1. Check CTB (Central Terminal Board) for jumper 1, 2, 3 (Jumper 1, 2, 3 must be cut and open) (Y/N) _____
2. Open humidistat contacts (Y/N) _____
3. Start unit In cooling (Close Y1) (Y/N) _____

OBSERVE AND RECORD

A. Suction pressure 

_______________ PSIG

B. Discharge pressure 

_______________ PSIG

C. Entering air temperature 

_______________ ° F

D. Liquid line temperature at outlet or reheat coil 

_______________ ° F

E. Confirm correct rotation for compressor (Y/N) _____
F. Check for correct ramp-up of outdoor fan motor as condenser coil warms (Y/N) _____

4. Switch unit to high-latent mode (sub-cooler) by closing humidistat with Y1 closed (Y/N) _____
5. Check unit charge per charging chart (Y/N) _____

OBSERVE

A. Reduction in suction pressure (5 to 7 psi expected) (Y/N) _____
B. Discharge pressure unchanged (Y/N) _____
C. Liquid temperature drops to 50°F to 55°F range (Y/N) _____
D. LSV solenoid energized (valve closes) (Y/N) _____

6. Switch unit to dehumid (reheat) by opening Y1 (Y/N) _____

OBSERVE

A. Suction pressure increases to normal cooling level
B. Discharge pressure decreases (35 to 50 psi) (Limited by head pressure control)
C. Liquid temperature returns to normal cooling level
D. LSV solenoid energized (valve closes)
E. DSV solenoid energized, valve opens

7. With unit in dehumid mode close W1 compressor and outdoor fan stop; LSV and DSV solenoids de-energized 

(Y/N) _____

8. Open W1 restore unit to dehumid mode (Y/N) _____
9. Open humidistat input compressor and outdoor fan stop; LSV and DSV solenoids de-energized (Y/N) _____

10. Restore setpoints for thermostat and humidistat (Y/N) _____

REPEAT PROCESS FOR 2 COMPRESSOR SYSTEMS

Summary of Contents for 48LC 14

Page 1: ...L 32 Unit Preparation 32 Gas Piping 32 Return Air Filters 32 Outdoor Air Inlet Screens 33 Compressor Mounting 33 Internal Wiring 33 Refrigerant Service Ports 33 Compressor Rotation 33 Cooling 33 Main...

Page 2: ...QUE FAIRE SI UNE ODEUR DE GAZ EST D TECT E Ne mettre en marche aucun appareil Ne toucher aucun interrupteur lectrique ne pas utiliser de t l phone dans le b timent Quitter le b timent imm diatement Ap...

Page 3: ...are situated on slide out racks for easy inspection and repair See Fig 1 To remove the filters 1 Remove vertical filter access door 2 Reach inside and extract the filters from the filter rack 3 Replac...

Page 4: ...th pul leys and then sliding the motor and plate away from the fan housing until proper tension is achieved 6 Check the alignment of the pulleys adjust if necessary 7 Tighten all bolts 8 Check the ten...

Page 5: ...lose to full open 0 2 change in pulley diameter per turn open 2 9 0 2 3 1 in pulley diameter when pulley closed one turn from full open COOLING Evaporator Coil The evaporator coil is traditional round...

Page 6: ...ical up and down motion Avoid spraying in horizontal pattern to minimize potential for fin damage 3 Ensure cleaner thoroughly penetrates deep into finned areas 4 Interior and exterior finned areas mus...

Page 7: ...ng thermostat Refrigerant overcharge or undercharge Recover refrigerant evacuate system and recharge to nameplate Defective compressor Replace and determine cause Insufficient line voltage Determine c...

Page 8: ...g Charging Charts Fig 9 13 vary refrigerant until the conditions of the appropriate chart are met Note the charging charts are different from the type normally used Charts are based on charging the un...

Page 9: ...450 500 550 600 650 s e e r g e D e r u t a r e p m e T g n i v a e L l i o C r o o d t u O F C Compressor Discharge Pressure psig Kpa 50LC500756 REV B Remove charge if below the curve Standard Unit S...

Page 10: ...0 600 650 s e e r g e D e r u t a r e p m e T g n i v a e L l i o C r o o d t u O F C Compressor Discharge Pressure psig Kpa 50LC500757 REV B Standard Unit Standard Unit with Humidi MiZer For Standard...

Page 11: ...0 400 450 500 550 600 650 Outdoor Coil Leaving Temperature Degrees F C Compressor Discharge Pressure psig Kpa 50LC500758 REV B Remove charge if below the curve Standard Unit Standard Unit w Humidi MiZ...

Page 12: ...600 650 s e e r g e D e r u t a r e p m e T g n i v a e L l i o C r o o d t u O F C Compressor Discharge Pressure psig Kpa 50LC500759 REV B Remove charge if below the curve Standard Unit Standard Unit...

Page 13: ...600 650 s e e r g e D e r u t a r e p m e T g n i v a e L l i o C r o o d t u O F C Compressor Discharge Pressure psig Kpa 50LC500760 REV B Remove charge if below the curve Standard Unit Standard Uni...

Page 14: ...e evaporator fan is probably also rotating in the wrong direction 5 Turn off power to the unit 6 Reverse any two of the unit power leads 7 Reapply power to the compressor The suction and discharge pre...

Page 15: ...nience outlet access is through the unit s control box access panel See Fig 15 The primary leads to the convenience outlet transformer are not factory connected Selection of primary power source is a...

Page 16: ...access to the wiring terminals The controller has three LEDs for Power Trouble andAlarm and a manual test reset but ton on the cover face Fig 18 Controller Assembly Sensor The sensor see Fig 19 includ...

Page 17: ...assembly 90 degrees and then rotate end to end Make sure that the elbow fitting is pointing down See Fig 22 Step 2 3 Screw the sensor and detector plate into its operating position using screws from S...

Page 18: ...n alarm state Controller Alarm Test Procedure 1 Press the controller s test reset switch for seven seconds 2 Verify that the controller sAlarm LED turns on Step 1 Step 2 Step 3 B D A C E F IMPORTANT F...

Page 19: ...SET TEST position for seven seconds 2 Verify that the test reset station sAlarm LED turns on 3 Reset the sensor by turning the key switch to the RESET TEST position for two seconds 4 Verify that the t...

Page 20: ...tdown control line is pulled to ground Trouble state The SuperDuct duct smoke detector enters the trouble state under the following conditions A sensor s cover is removed and 20 minutes pass before it...

Page 21: ...g condition by a low pressure switch located on the suction line near the compressor The switch is stem mounted Trip setting is 54 psig 5 psig 372 34 kPa Reset is automatic at 117 5 psig 807 34 kPa SU...

Page 22: ...t be within specified ranges See Table 5 Adjust unit gas regulator valve as required or consult local gas utility Manifold pressure is factory adjusted for NG fuel use Adjust as required to obtain bes...

Page 23: ...ection slide the sliding burner partition out of the unit To inspect blower wheel shine a flashlight into draft hood open ing If cleaning is required remove motor and wheel as follows 1 Remove the 7 s...

Page 24: ...n before removing from the rack 3 Use a soft brush to clean burners and cross over port as required 4 Adjust spark gap The gap should be 0 12 to 0 14 in 3 06 to 3 60 mm and spaced 0 18 in 4 60 mm from...

Page 25: ...ut off valve then turn on unit main gas valve 6 Set room thermostat to call for heat Verify high stage heat operation before attempting to adjust manifold pressure 7 When main burners ignite check all...

Page 26: ...s If more than one error code exists all applicable codes will be displayed in numerical sequence Orifice Replacement This unit uses orifice type LH32RFnnn where nnn indicates ori fice reference size...

Page 27: ...27 Fig 38 Integrated Gas Control IGC Board RED LED STATUS...

Page 28: ...gas section analog input J1 1 3 FS T1 Flame sensor gas section switch input W Heat stage 1 LCTB 24 VAC J2 2 RS Rollout switch gas section switch input J2 5 6 LS Limit switch fan section switch input...

Page 29: ...00 12000 3658 372 114 400 372 161 200 372 208 000 13000 3962 392 105 600 392 148 800 392 192 000 14000 4267 392 96 800 392 136 400 392 176 000 PROPANE GAS NOMINAL HEAT INPUT ELEVATION 220K BTUH 310K B...

Page 30: ...in gas line Drain water and install drip leg to trap water No power to furnace Check power supply fuses wiring and circuit breaker No 24 v power supply to control circuit Check transformer Transforme...

Page 31: ...Power reset for LED reset 4 consecutive limit switch faults within a single call for heat See Limit Switch Fault 5 Flashes Ignition Fault No gas heating Heat call W Off Power reset for LED reset Unit...

Page 32: ...ove a component wear PPE and proceed as follows a Shut off all electrical power and gas to unit Apply applicable lockout tag out procedures b Recover refrigerant to relieve all pressure from sys tem u...

Page 33: ...ithin 5 seconds If the burner does not light then there is a 22 second delay before another 5 second try If the burner still does not light the time delay is repeated If the burner does not light with...

Page 34: ...t 208 230 v units are factory wired for the voltage shown on the nameplate If the 208 230 v unit is to be connected to a 208 v power supply the control transformer must be rewired by moving the black...

Page 35: ...king Green LED Note 1 2 Check HPS LPS COFS RED RED 3 Call for Y3 with no call for Y1 Check Y1 wiring RED 4 Call for Y3 with no call for Y1 Y2 Check Y1 wiring RED RED 5 Call for Y2 with no call for Y1...

Page 36: ...will run and the outdoor fan will run at low speed If there is further de mand for cooling the outdoor air damper will maintain its current position compressor C2 will run and the outdoor fan will ru...

Page 37: ...he main burners EconoMi er X Factory Option The EconoMi er X system is an expandable economizer con trol system which includes a W7220 economizer module con troller with an LCD and keypad see Fig 46 T...

Page 38: ...haust fan Y1 Y2 and AUX1 O All Relay Outputs at 30 vac Running 1 5A maximum Inrush 7 5A maximum ENVIRONMENTAL Operating Temperature 40 F to 150 F 40 C to 65 C Exception of display operation down to 4...

Page 39: ...d on the front of the economizer controller Keypad Use the four navigation buttons see Fig 50 to scroll through the menus and menu items select menu items and to change parameter and configuration set...

Page 40: ...ays 2 Press the Enter button to return to the current menu parameter 3 Press the Menu Up Exit button to return to the previ ous menu Menu Structure Table 21 illustrates the complete hierarchy of menus...

Page 41: ...and displays measured discharge temperature Displays _ _ F if sensor sends invalid value if not connected short or out of range OA TEMP _ _ _ F or _ _ _ C 40 F to 140 F 40 C to 60 C OUTSIDE AIR TEMP...

Page 42: ...alpy curves DCV SET 1100ppm 500 to 2000 ppm increment by 100 DEMAND CONTROLLED VENTILATION Displays only if CO2 sensor is connected Set point for Demand Controlled Ventilation of space Above the set p...

Page 43: ...out for second exhaust fan SYS use output as an alarm signal OCC INPUT INPUT or ALWAYS OCCUPIED MODE BY EXTERNAL SIGNAL When using a setback thermostat with occupancy out 24 vac the 24 vac is input I...

Page 44: ...e fully closed position CONNECT Y1 O N A N A Closes the Y1 O relay Y1 O CONNECT Y2 O N A N A Closes the Y2 O relay Y2 O CONNECT AUX1 O N A N A Energizes the AUX output If Aux setting is NONE no action...

Page 45: ...operation with a 2 speed indoor fan with or without DCV see Tables 27 and 28 For enthalpy operation with a 2 speed indoor fan with or with out DCV see Tables 29 and 30 ALARMS cont FREEZE ALARM N A N...

Page 46: ...NTILATION DCV OUTSIDE AIR GOOD TO ECONOMIZE Y1 I Y2 I FAN SPEED Y1 O Y2 O OCCUPIED UNOCCUPIED Below CO2 set No Off Off High 0 v Off 0 v Off VENTMIN Closed On Off High 24 v On 0 v Off VENTMIN Closed On...

Page 47: ...CCUPIED UNOCCUPIED Below CO2 set No Off Off High 0 v Off 0 v Off VENTMIN Closed On Off High 24 v On 0 v Off VENTMIN Closed On On High 24 v On 24 v On VENTMIN Closed Yes Off Off High 0 v Off 0 v Off VE...

Page 48: ...Y2 I FAN SPEED Y1 O Y2 O OCCUPIED UNOCCUPIED Below CO2 Set No OFF OFF LOW 0v Off 0v Off VENTMIN Closed ON OFF LOW 24v On 0v Off VENTMIN Closed ON ON HIGH 24v On 24v On VENTMIN Closed Yes OFF OFF LOW...

Page 49: ...the supply fan and controls the OA damper to the required position see Table 31 The W heating mode is not controlled by the W7220 but it re quires the status to know where to position the OA damper fo...

Page 50: ...utton to select the item RUN appears 3 Press the Enter button to start the test The unit pauses and then displays IN PROGRESS When the test is complete DONE appears 4 When all desired parameters have...

Page 51: ...e quency Drive The Staged Air Volume SAV system utilizes a Variable Fre quency Drive VFD to automatically adjust the indoor fan mo tor speed in sequence with the unit s ventilation cooling and heating...

Page 52: ...g 55 LCD Alpha Numeric Display 230V 460V 575V ONLY 1 Parameter number and name 2 Parameter value 3 Setup number shows the active setup and the edit setup If the same set up acts as both the active and...

Page 53: ...ecure the cable to the VFD 2 Connect the female end of the cable to the back panel of the VFD Remote keypad Secure the cable to the remote keypad using the 2 remaining screws from the kit 1 Com LED Fl...

Page 54: ...display changes to d With the top row highlighted press OK The display changes to NOTE If English is not the desired language press OK select the desired language and press OK again e Press Down Arrow...

Page 55: ...w keys to select the nameplate voltage Press OK again to set the selected voltage i Press Down Arrow once to display the following j Press OK to highlight the Frequency value and then use the and Up a...

Page 56: ...ing display appears NOTE If the bottom row displays a number other than 0 000 press OK and use the and Up and Down Arrow key to select 0 000 e Press Down Arrow once the following display appears NOTE...

Page 57: ...o enter the required values 10 Setting Digital Inputs a Press the Back key until the following display appears b Press Down Arrow once the following display appears c Press OK the following display ap...

Page 58: ...ges to h Press Down Arrow once the following display appears i Press OK to highlight the number of seconds and use the and Up and Down Arrow keys to select 600 seconds Press OK again to set the select...

Page 59: ...4 3 10 5 3 10 6 3 10 7 STD 208 230V 2 0 1 1 0 4 0 53 43 79 57 100 100 0 0 0 460V 2 0 1 1 0 4 0 53 43 79 57 100 100 0 0 0 575V 2 0 1 1 0 4 0 53 43 79 57 100 100 0 0 0 MID 208 230V 2 0 1 1 0 4 0 53 43 7...

Page 60: ...4 3 10 5 3 10 6 3 10 7 STD 208 230V 2 0 1 1 0 4 0 56 64 82 40 100 100 0 0 0 460V 2 0 1 1 0 4 0 56 64 82 40 100 100 0 0 0 575V 2 0 1 1 0 4 0 56 64 82 40 100 100 0 0 0 MID 208 230V 2 0 1 1 0 4 0 56 64...

Page 61: ...0 4 3 10 5 3 10 6 3 10 7 STD 208 230V 2 0 1 1 0 4 0 52 57 61 63 100 100 0 0 0 460V 2 0 1 1 0 4 0 52 57 61 63 100 100 0 0 0 575V 2 0 1 1 0 4 0 52 57 61 63 100 100 0 0 0 MID 208 230V 2 0 1 1 0 4 0 52 57...

Page 62: ...3 1 82 1 90 3 10 0 3 10 1 3 10 2 3 10 3 3 10 4 3 10 5 3 10 6 3 10 7 STD 208 230V 2 0 1 1 0 4 0 52 33 64 48 100 100 0 0 0 460V 2 0 1 1 0 4 0 52 33 64 48 100 100 0 0 0 575V 2 0 1 1 0 4 0 52 33 64 48 100...

Page 63: ...30 60 37 3 1755 460V HD64FK654 HK30WA386 131L9869 1 122 16 460 60 16 9 1755 575V HD64FL576 HK30WA388 131N0233 1 132 16 575 60 12 6 1755 Start Delay Sec Flying Start Min Speed for Function Hz Motor The...

Page 64: ...s the CO2 level in the zone increases above the CO2 set point the minimum position of the damper will be increased pro portionally As the CO2 level decreases because of the increase of fresh air the o...

Page 65: ...to come to temperature before turning on the indoor fan This will prevent the unit from blowing cold air into the space Once the ISC board sees IFO ON the VFD controlled indoor fan is set to high spe...

Page 66: ...Al Cu Al Cu B Precoat Al Cu Al Cu C E coat Al Cu Al Cu D E coat Al Cu E coat Al Cu E Cu Cu Al Cu F Cu Cu Cu Cu M Al Cu Al Cu Louvered Hail Guard N Precoat Al Cu Al Cu Louvered Hail Guard P E coat Al...

Page 67: ...2 9 2 9 2 9 7 4 7 4 RPM range 498 676 555 753 676 854 707 888 707 888 Motor frame size 56 56 56HZ 184T 184T Fan Qty Type 2 Centrifugal 2 Centrifugal 2 Centrifugal 2 Centrifugal 2 Centrifugal Fan Diame...

Page 68: ...l 2 Centrifugal Fan Diameter in 18 x 15 15 x 11 18 x 15 15 x 11 18 x 15 15 x 11 18 x 15 15 x 11 18 x 15 15 x 11 ULTRA HIGH STATIC Motor Qty Drive Type 1 1 Belt 1 2 Belt 1 2 Belt N A N A Max BHP 208 23...

Page 69: ...5 195 115 Temperature rise F 20 55 30 60 30 60 30 60 30 60 HIGH of stages of burners total 1 or 2 7 1 or 2 9 1 or 2 9 1 or 2 9 1 or 2 9 Connection size 3 4 in NPT 3 4 in NPT 3 4 in NPT 3 4 in NPT 3 4...

Page 70: ...motor does not have to be replaced by an EPACT com pliant energy efficient motor Variable speed motors are exempt from EPACT compliance requirements Boldface indicates field supplied drive is required...

Page 71: ...1 38 710 1 66 774 1 95 835 2 26 5625 593 1 29 662 1 56 728 1 86 791 2 17 850 2 48 5938 619 1 48 685 1 77 748 2 08 808 2 40 866 2 73 6250 644 1 70 707 2 00 768 2 32 826 2 65 882 2 99 CFM Available Ext...

Page 72: ...35 828 5 13 877 5 96 924 6 83 7125 755 4 19 807 4 94 857 5 75 905 6 60 951 7 50 7500 789 4 80 839 5 58 887 6 42 933 7 31 977 8 23 CFM Available External Static Pressure in wg 1 2 1 4 1 6 1 8 2 0 RPM B...

Page 73: ...4 03 7125 690 2 33 767 2 86 838 3 41 899 3 94 954 4 45 7500 719 2 66 791 3 20 861 3 79 922 4 35 977 4 90 CFM Available External Static Pressure in wg 1 2 1 4 1 6 1 8 2 0 RPM BHP RPM BHP RPM BHP RPM B...

Page 74: ...47 882 6 30 928 7 18 973 8 11 7875 823 5 48 871 6 29 917 7 15 962 8 07 1005 9 03 8313 864 6 35 909 7 19 953 8 09 996 9 04 1038 10 03 8750 905 7 31 948 8 19 990 9 13 1031 10 11 1071 11 13 CFM Availabl...

Page 75: ...0 3 29 892 3 80 947 4 30 7438 714 2 60 787 3 14 857 3 72 918 4 28 973 4 82 7875 748 3 03 817 3 58 884 4 20 945 4 80 1000 5 38 8313 783 3 50 847 4 07 912 4 72 972 5 36 1027 5 98 8750 819 4 03 878 4 61...

Page 76: ...881 6 75 926 7 61 969 8 53 1011 9 49 1052 10 49 9 000 928 7 91 970 8 81 1011 9 76 1052 10 76 1091 11 81 9 500 975 9 20 1015 10 14 1054 11 13 1093 12 17 1130 13 25 10 000 1022 10 62 1060 11 60 1098 12...

Page 77: ...5 62 1016 6 33 1069 7 01 9 500 880 5 06 933 5 66 990 6 36 1047 7 10 1100 7 84 10 000 922 5 84 970 6 45 1025 7 17 1079 7 94 1131 8 72 CFM Available External Static Pressure in wg 1 2 1 4 1 6 1 8 2 0 R...

Page 78: ...9 563 979 9 31 1019 10 25 1058 11 25 1096 12 29 1133 13 37 10 125 1032 10 94 1070 11 93 1107 12 96 10 688 1085 12 75 11 250 CFM Available External Static Pressure in wg 1 2 1 4 1 6 1 8 2 0 RPM BHP RPM...

Page 79: ...10 125 932 6 05 980 6 66 1033 7 38 1088 8 17 1139 8 96 10 688 979 7 05 1023 7 67 1073 8 41 1125 9 22 1175 10 06 11 250 1026 8 16 1067 8 79 1114 9 55 1163 10 38 1211 11 26 CFM Available External Stati...

Page 80: ...872 High static 1291 1271 1251 1231 1210 1190 1170 1150 1130 1110 1089 1069 1049 Factory setting Table N Pulley Adjustment Horizontal Units 48LC UNIT MOTOR DRIVE COMBO MOTOR PULLEY TURNS OPEN 0 0 5 1...

Page 81: ...81 Fig B Typical Electromechanical Control Wiring Diagram 48LC 14 26 APPENDIX D WIRING DIAGRAMS...

Page 82: ...82 Fig C 48LC 14 26 Systemvu Control Schematic APPENDIX D WIRING DIAGRAMS...

Page 83: ...83 Fig D 48LC 14 26 RTU Open Control Wiring Diagram APPENDIX D WIRING DIAGRAMS...

Page 84: ...84 Fig E Typical Power Wiring Diagram 48LC 14 20 208 230 v shown NOTE This power wiring diagram is typical for electromechanical SystemVu and RTU Open units APPENDIX D WIRING DIAGRAMS...

Page 85: ......

Page 86: ...discontinue or change at any time specifications or designs without notice and without incurring obligations Catalog No 04 53480153 01 Printed in U S A Form 48LC 14 26 03SM Pg 86 2 2020 Replaces 48LC...

Page 87: ...ied range Y N _____ Check gas piping for leaks Y N _____ Check that indoor air filters are clean and in place Y N _____ Check that outdoor air inlet screens are in place Y N _____ Verify that unit is...

Page 88: ...e _______________ PSIG C Entering air temperature _______________ F D Liquid line temperature at outlet or reheat coil _______________ F E Confirm correct rotation for compressor Y N _____ F Check for...

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