48EJ,EK,EW,EY024-048 Single Package Rooftop Units Electric Cooling/Gas Heating Installation, Start-Up and Service Instructions CONTENTS Page SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31 Step 1 — Provide Unit Support . . . . . . . . . . . . . . . 1 • ROOF CURB • ALTERNATE UNIT SUPPORT Step 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . . 2 • POSITIONING • ROOF MOUNT Step 3 — Field Fabricate Ductwork . . .
ALTERNATE UNIT SUPPORT — When the preferred curb or slab mount cannot be used, support unit with sleepers on perimeter, using unit curb support area. If sleepers cannot be used, support long sides of unit (refer to Fig. 3-6) with a minimum number of 4-in. x 4-in. pads spaced as follows: 48EJ,EK,EW,EY024-034 units require 3 pads on each side; 48EJ,EK,EW,EY038-048 units require 4 pads on each side. Unit may sag if supported by corners only.
NOTES: 1. All roof curb parts are to be 16 ga galvanized steel. 2. Dimensions are in inches. 3. To prevent standing water in the drain pan of the indoor section and the heat exchangers, unit can only be pitched as shown. UNIT LEVELING TOLERANCES DIMENSIONS* (Degrees and Inches) A Deg. 1.0 B in. 2.9 Deg. .50 *From edge of unit to horizontal. Fig. 1 — Roof Curb (Sizes 024-034) 3 in. .
NOTES: 1. All roof curb parts are to be 16 ga galvanized steel. 2. Dimensions are in inches. 3. To prevent standing water in the drain pan of the indoor section and the heat exchangers, unit can only be pitched as shown. UNIT LEVELING TOLERANCES DIMENSIONS* (Degrees and Inches) A Deg. 1.0 B in. 2.9 Deg. .50 *From edge of unit to horizontal. Fig. 2 — Roof Curb (Sizes 038-048) 4 in. .
VFD — Variable Frequency Drive NOTES: 1. Weights include economizer (STD). 2. Center of gravity. 3. Do not locate adjacent units with flue discharge facing economizer inlet. Minimum clearances to be: Adjacent Units: 158-09 Top of Units: No overhang Condenser Coil: 48-09 Economizer Side: 68-09 Gas Heat Side: 48-09 Filter Access Side: 108-09 (For Removal of Evaporator Coil) 4. For smaller service and operational clearances, contact Carrier Application Engineering department. 5.
VFD — Variable Frequency Drive OPERATING WEIGHT lb 48EJ,EKD038 4442 48EJE038 4602 48EJ,EKD044 4668 48EJE044 4828 48EJ,EKD048 4955 48EJE048 5115 UNIT SIZE NOTES: 1. Weights include economizer (STD). 2. Center of gravity. 3. Do not locate adjacent units with flue discharge facing economizer inlet. Minimum clearances to be: Adjacent Units: 158-09 Top of Units: No overhang Condenser Coil: 48-09 Economizer Side: 68-09 Gas Heat Side: 48-09 Filter Access Side: 108-09 (For Removal of Evaporator Coil) 4.
VFD — Variable Frequency Drive UNIT SIZE NOTES: 1. Weights include economizer (STD). 2. Center of gravity. 3. Do not locate adjacent units with flue discharge facing economizer inlet. Minimum clearances to be: Adjacent Units: 158-09 Top of Units: No overhang Condenser Coil: 48-09 Economizer Side: 68-09 Gas Heat Side: 48-09 Filter Access Side: 108-09 (For Removal of Evaporator Coil) 4. For smaller service and operational clearances, contact Carrier Application Engineering department. 5.
VFD — Variable Frequency Drive UNIT SIZE NOTES: 1. Weights include economizer (STD). 2. Center of gravity. 3. Do not locate adjacent units with flue discharge facing economizer inlet. Minimum clearances to be: Adjacent Units: 158-09 Top of Units: No overhang Condenser Coil: 48-09 Economizer Side: 68-09 Gas Heat Side: 48-09 Filter Access Side: 108-09 (For Removal of Evaporator Coil) 4. For smaller service and operational clearances, contact Carrier Application Engineering department. 5.
UNIT 48EJ,EK,EW,EYD024 48EJ,EWE024 48EJ,EK,EW,EYD028 48EJ,EK,EW,EYD030 48EJ,EK,EW,EYD034 48EJ,EWE028 48EJ,EWE030 48EJ,EWE034 48EJ,EK,EW,EYD038 48EJ,EWE038 48EJ,EK,EW,EYD044 48EJ,EWE044 48EJ,EK,EW,EYD048 48EJ,EWE048 WEIGHT lb kg 4176 1894 4256 1930 A B in. mm 87.68 2227 C in. 72.4 73.3 mm 1839 1862 in. 42.4 42.7 mm 1072 1085 69.6 1768 44.0 1118 4262 1933 4342 1969 70.1 1781 44.3 1125 4442 4602 4668 4828 4955 5115 2015 2087 2117 2190 2248 2320 92.7 94.1 89.3 90.8 87.7 89.
Table 1 — Physical Data UNIT 48EJ,EK,EW,EY NOMINAL CAPACITY (tons) OPERATING WEIGHT (lb)* Unit Al/Al† (Lo Heat/Hi Heat) Al/Cu† (Lo Heat/Hi Heat) Roof Curb (14-in. curb) COMPRESSOR Type Ckt 1 Ckt 2 Number of Refrigerant Circuits Oil (oz) (Ckt 1, Ckt 2) REFRIGERANT TYPE Operating Charge (lb-oz) Circuit 1** Circuit 2 CONDENSER COIL Quantity Rows...Fins/in. Total Face Area (sq ft) CONDENSER FAN Nominal Cfm Quantity...Diameter (in.) Motor Hp (1075 Rpm) EVAPORATOR COIL Rows...Fins/in.
Table 1 — Physical Data (cont) UNIT 48EJ,EK,EW,EY NOMINAL CAPACITY (tons) OPERATING WEIGHT (lb)* Unit Al/Al† (Lo Heat/Hi Heat) Al/Cu† (Lo Heat/Hi Heat) Roof Curb (14-in. curb) COMPRESSOR Type Ckt 1 Ckt 2 Number of Refrigerant Circuits Oil (oz) (Ckt 1, Ckt 2) REFRIGERANT TYPE Operating Charge (lb-oz) Circuit 1** Circuit 2 CONDENSER COIL Quantity Rows...Fins/in. Total Face Area (sq ft) CONDENSER FAN Nominal Cfm Quantity...Diameter (in.) Motor Hp (1075 Rpm) EVAPORATOR COIL Rows...Fins/in.
Table 2 — Evaporator Fan Motor Data (Units with Starting Serial Numbers 4197 and Later) UNIT SIZE 48E 024 028 030 034 038 044 048 MOTOR HP MOTOR SHAFT DIA. (in.) FAN SHAFT SPEED (rpm) MOTOR SHEAVE 5 10 15 7.5 10 15 10 15 20 10 15 20 10 15 20 15 20 25 20 25 30 1.12 1.38 1.62 1.38 1.38 1.62 1.38 1.62 1.62 1.38 1.62 1.62 1.38 1.62 1.62 1.62 1.62 1.88 1.62 1.88 1.
Step 5 — Trap Condensate Drain — See Fig. 3-6 for drain location. Condensate drain is open to atmosphere and must be trapped. Install a trapped drain at the drain location. A trap at least 4-in. deep must be used. See Fig. 12. Trap must be installed to prevent freeze-up. Condensate pans are sloped so that water will completely drain from the condensate pan to comply with indoor air quality guidelines. The condensate drain pan is fitted with a 1-in. FPT coupling.
Table 3 — Controls Options and Configurations (Non-Thermostat Applications) UNIT CONFIGURATION CV or VAV Unit with SPT Sensor CV Unit with SPT Sensor and Remote Start/Stop Switch VAV Unit Remote Start/Stop Switch Only VAV Unit with SPT Sensor and Remote Start/Stop Switch CV NA RAT SAT SPT VAV — — — — — — DEFAULT COOLING Unoccupied Cooling — 90 F (SPT) Occupied Cooling — NA Unoccupied Cooling — 90 F (SPT) Occupied Cooling — 78 F (SPT) Unoccupied Cooling — 90 F (RAT) Occupied Cooling — 55 F (SAT) Unoccupied
VARIABLE AIR VOLUME (VAV) APPLICATIONS Features with Stand-Alone Applications — The units, as shipped, are operable as stand-alone units with the addition of a timeclock to establish unit start and stop times. Heating and cooling in both on and off modes is controlled to default values by the base unit control. Set points may be changed with appropriate input devices. The control has an on-board occupancy schedule which can be set using an input device and eliminates the need for an external timeclock.
When a VAV unit with a space temperature sensor is accessed via a computer, the following additional features are available: • ability to initiate timed override from T-55 sensors • temperature compensated start to calculate early start time before occupancy • provide space temperature reset to reset the supply air set point upward when the temperature falls below the occupied cooling set point An electronic expansion board may be field-installed to provide the following features: • fan status • filter stat
LEGEND CCN COM D LED N.C. — — — — — Carrier Comfort Network Common Diode Light-Emitting Diode Normally Closed N.O. R SIO SW T — — — — — Normally Open Relay Serial Input/Output Switch Terminal *Where X is the unit control software version number. Fig.
Table 4 — Electrical Data COMPRESSOR VOLTAGE OFM IFM UNIT NOMNAL RANGE No. 1 No. 2 SIZE VOLTAGE 48E (3 Ph 60 Hz) Min Max RLA LRA RLA LRA Qty Hp FLA Hp FLA (ea) 024 028 030 187 254 39.1 228 25.6 160 2 1 5.3 460 414 508 19.9 114 11.5 80 2 1 2.7 575 518 632 16.0 91 9.6 64 2 1 2.4 208/230 187 254 39.1 228 39.1 228 2 1 5.3 460 414 508 19.9 114 19.9 114 2 1 2.7 575 518 632 16.0 91 16.0 91 2 1 2.4 208/230 187 254 57.1 266 39.1 228 2 1 5.
Table 4 — Electrical Data (cont) COMPRESSOR VOLTAGE OFM IFM UNIT NOMINAL RANGE No. 1 No. 2 SIZE VOLTAGE 48E (3 Ph 60 Hz) Min Max RLA LRA RLA LRA Qty Hp FLA Hp FLA (ea) 034 038 208/230 187 254 57.1 266 57.1 266 2 1 5.3 460 414 508 25.6 120 25.6 120 2 1 2.7 575 518 632 20.5 96 20.5 96 2 1 2.4 208/230 187 254 57.1 266 57.1 266 4 1 5.3 460 414 508 25.6 120 25.6 120 4 1 2.7 575 518 632 20.5 96 20.5 96 4 1 2.
Table 4 — Electrical Data (cont) COMPRESSOR VOLTAGE OFM IFM UNIT NOMINAL RANGE No. 1 No. 2 SIZE VOLTAGE 48E (3 Ph 60 Hz) Min Max RLA LRA RLA LRA Qty Hp FLA Hp FLA (ea) 044 048 208/230 187 254 69.2 345 69.2 345 4 1 5.3 460 414 508 28.8 173 28.8 173 4 1 2.7 575 518 632 26.7 120 26.7 120 4 1 2.4 208/230 187 254 82.1 446 69.2 345 4 1 5.3 460 414 508 42.3 223 28.8 173 4 1 2.7 575 518 632 34.6 164 26.7 120 4 1 2.
Sensor Wiring (CV or VAV) — The temperature sensor is wired into the unit control board. See Fig. 21. The unit is controlled with a T-55 or T-56 (CV only) zone sensor. Terminal TH (T-56) or T1 (T-55) on the sensor is connected to T1 of the base module board. Terminal COM (T-56) or T2 (T-55) on the sensor is connected to T2 on the base module board. If a T-56 set point override sensor is used, the override connection SW on the sensor is connected to T3 on the base module board.
LEGEND C CB DIP FU HR — — — — — Contactor/Compressor Circuit Breaker Dual In-Line Package Fuse Heater Relay IF OF PEC TB TRAN — — — — — Indoor Fan Outdoor Fan Power Exhaust Controller Terminal Block Transformer Fig. 19 — Control Box Diagram (Sizes 038-048) NOTE: Sensor part numbers are as follows: T-55 — CEC0121448-01 T-56 — CEC0121503-01 Fig. 21 — Field Control Temperature Sensor Wiring (CV or VAV Units) Fig.
SPACE TEMPERATURE AVERAGING — 4 SENSOR APPLICATION SPACE TEMPERATURE AVERAGING — 9 SENSOR APPLICATION Fig. 22 — Space Temperature Averaging Wiring signal pins must be wired to signal ground pins. Wiring connections for CCN should be made at the 3-pin plug (CCN located at the base board). Consult CCN literature for further information. Conductors and drain wire must be 20 AWG minimum stranded, tinned copper. Individual conductors must be insulated with PVC, PVC/nylon, vinyl, Teflon, or polyethylene.
2. Assemble hood sides, top, and cross member with gasketed screws provided. See Fig. 24. 3. Attach 10 green speed clips (provided) to hood top. 4. Apply black seal strip (provided) to mounting flanges of hood sides being sure to cover mounting holes. See Fig. 25. NOTE: Each hood assembly has a slotted side that should be adjacent to the other hood when mounted to the unit. 5. Apply black seal strip (provided) to hood top mounting flange.
TOP FLANGE BLACK SEAL STRIP HOOD SIDE MOUNTING FLANGE HOOD SIDE Fig. 23 — Adding Seal Strip to Top of Hood Sides Fig. 25 — Adding Seal Strip to Mounting Flange of Hood Sides HOOD TOP HOOD SIDE Fig. 26 — Adding Seal Strip to Hood Top Mounting Flange NOTE: Left side economizer hood has mounting angle without tabs and filter track assembled end on the opposite side. GRAY FOAM STRIP Fig. 24 — Economizer Hood Assembly (Right Side Economizer Hood Shown) CROSS MEMBER Fig.
The outdoor-air damper closes. The control allows 90 seconds for the damper to close in case it is in the full open position. Next, the indoor-fan contactor will energize. The outdoor-air damper will remain at 0% for 30 seconds. It will then move to the 10% position for another 30 seconds. This will be repeated at every 10% increment for 30 seconds until the damper reaches 100% open. Close DIP switch no. 4 during the 30 seconds immediately after the desired outdoor air minimum damper position.
5. Turn the enthalpy control set point potentiometer clockwise past the ‘‘D’’ setting on the enthalpy control to configure the control to operate on differential enthalpy. See Fig. 34. 6. Remove the return-air enthalpy sensor from the accessory package. Using the screws provided, mount the sensor inside the return duct near the unit. Do not locate the control too far from the unit, or the wires will not reach from the sensor to the control.
CONTROL CURVE A B C D CONTROL POINT (APPROX. DEG.) AT 50% RH 73 (23) 70 (21) 67 (19) 63 (17) NOTE: Switches shown in high enthalpy state. Terminals 2 and 3 close on enthalpy decrease. Fig. 34 — Wiring Connections for Solid-State Enthalpy Control (HH57AC077) RH — Relative Humidity Fig. 35 — Psychrometric Chart for Enthalpy Control NOTE: Partitions shown indicate both side supply (EW/EY) and vertical supply (EJ/EK) units. Fig.
See Fig. 38. A section of field-supplied 1⁄4-in. plastic tubing must be run from the high pressure tap on the differential pressure switch and connected to a field-supplied tap in the supply-air duct. The tap is usually located 2⁄3 of the way out on the main supply duct. Remove plug button in panel to route tubing. The low pressure tap is factory-routed to the atmosphere. For a positive-pressure building, route the high tap to building air and low tap to atmosphere.
When replacing the OFM, reconnect the black, yellow, and blue wires form the outdoor fan contactor to the black, yellow, and blue wires of the Motormaster III control. Run new wires from the red, orange, and brown wires to the leads of the new OFM. Connect the green wire from the control to ground. NOTE: On all 575-v units, 2 transformers (part no. HT01AH851) must be used for each Motormaster III control to lower the supply voltage to the control to 460-v.
Fig. 40A — Motormaster III Sensor Location (Sizes 024-034) Fig. 40C — Motormaster III Sensor Location (Size 048) Internal Wiring — Check all electrical connections in unit control boxes; tighten as required. Refrigerant Service Ports — Each refrigerant system has one suction port located in the top of the compressor motor casing. All units also have one service port on the liquid line valve and one on the compressor discharge valve. Be sure that caps on the ports are tight.
the base module closes contacts, activating two exhaust fans. When the economizer position reaches 75% open, the base module activates the other two exhaust fans. The fans will turn off when the economizer closes below the same points. The economizer position set points that trigger the exhaust fans can be modified, but only through use of the Service Tool, Comfort Works, or Building Supervisor software.
brated in 1% increments, and is factory set at approximately 3%. It is recommended to leave the set point at 3%, to minimize cycling of the fans. The offset and differential potentiometers have been factory set for atmospheric pressure. Do not change these settings until there is some experience with the building. In most cases the factory settings will be satisfactory. However, if the building pressure is not being maintained as desired, then some minor adjusting on a trial and error basis can be made.
Table 9 — Power Exhaust Default Set Points STAGE OFFSET DIFFERENTIAL OFF VOLTAGE ON VOLTAGE 1 2 3 4 50% 55% 60% 64% 3% 3% 3% 3% 6.0 6.5 7.0 7.4 6.3 6.8 7.3 7.7 OFF STATIC PRESSURE (in. wg) 0.00 0.06 0.12 0.
Table 12 — Fan Performance, 48EJ/EK024-034 — Vertical Discharge Units (For EW/EY units, reduce net available external static pressure by 0.3 in. wg) AIRFLOW (Cfm) 4,000 5,000 6,000 7,000 8,000 8,250 9,000 10,000 11,000 12,000 12,500 13,000 13,750 14,000 15,000 AIRFLOW (Cfm) 4,000 5,000 6,000 7,000 8,000 8,250 9,000 10,000 11,000 12,000 12,500 13,000 13,750 14,000 15,000 AIRFLOW (Cfm) 4,000 5,000 6,000 7,000 8,000 8,250 9,000 10,000 11,000 12,000 12,500 13,000 13,750 14,000 15,000 0.
Table 13 — Fan Performance, 48EJ,EK038,044 — Vertical Discharge Units (For EW/EY units, reduce net available external static pressure by 0.5 in. wg) AIRFLOW (Cfm) 7,000 8,000 9,000 10,000 11,000 12,000 13,000 14,000 15,000 16,000 17,000 18,000 19,000 20,000 AIRFLOW (Cfm) 7,000 8,000 9,000 10,000 11,000 12,000 13,000 14,000 15,000 16,000 17,000 18,000 19,000 20,000 AIRFLOW (Cfm) 7,000 8,000 9,000 10,000 11,000 12,000 13,000 14,000 15,000 16,000 17,000 18,000 19,000 20,000 0.
Table 14 — Fan Performance, 48EJ,EK048 — Vertical Discharge Units (For EW/EY units, reduce net available external static pressure by 0.5 in. wg) AIRFLOW (Cfm) 9,000 10,000 11,000 12,000 13,000 14,000 15,000 16,000 17,000 18,000 19,000 20,000 AIRFLOW (Cfm) 9,000 10,000 11,000 12,000 13,000 14,000 15,000 16,000 17,000 18,000 19,000 20,000 AIRFLOW (Cfm) 9,000 10,000 11,000 12,000 13,000 14,000 15,000 16,000 17,000 18,000 19,000 20,000 0.2 Rpm 528 577 627 677 728 779 830 882 934 986 1038 1091 Bhp 3.20 4.
Table 15 — Fan Performance — Power Exhaust 48EJ,EK,EW,EY024-048 (20 THRU 45 TONS) Low Speed Airflow 208 v 230, 460, 575 v (Cfm) ESP Bhp Watts ESP Bhp Watts 6,500 0.32 2.82 3160 0.70 2.98 3340 6,700 0.23 2.87 3220 0.63 3.03 3400 6,900 0.17 2.92 3270 0.59 3.09 3460 7,100 0.13 2.93 3290 0.56 3.11 3490 7,300 0.09 2.97 3330 0.53 3.15 3530 7,500 ———0.51 3.19 3580 7,700 ———0.48 3.23 3620 7,900 ———0.45 3.27 3670 8,100 ———0.40 3.
Table 17 — Air Quantity Limits UNIT 48EJ,EK,EW,EY MINIMUM HEATING AIRFLOW (Low Heat) MINIMUM HEATING AIRFLOW (High Heat) 024 028 030 034 038 044 048 5730 5730 5730 5730 7360 7360 7360 5950 5950 5950 5950 9820 9820 9820 MINIMUM COOLING AIRFLOW (VAV) AT FULL LOAD OPERATION 2000 2500 2750 3000 3500 4000 4500 MINIMUM COOLING AIRFLOW (CV) MAXIMUM AIRFLOW 6,000 7,500 8,250 9,000 10,500 12,000 13,500 10,000 12,500 13,750 15,000 17,500 20,000 22,500 LEGEND CV — Constant Volume VAV — Variable Air Volume
Table 18 — User Defined Set Points SET POINT NAME OHSP OCSP UHSP UCSP SASP OATL NTLO RTIO LIMT MDP FORMAT LOWMDP xxx% IAQS UHDB UCDB LTMP HTMP PES1 PES2 xxxx xx.xF xx.xF xxx% xxx% xxx% xxx% xx.xF xx.xF xx.xF xx.xF xx.xF xx.xF xx.xF xx.x xx.
When cooling, the control will energize the power exhaust enable output to the external power exhaust controller, when power exhaust is used. If occupied, the control will perform economizer control (economizer control same as described above for CV units). If unoccupied, the control will perform nighttime free cool and IAQ pre-occupancy purge as required (when enabled through software). When DX (direct expansion) cooling is called, the outdoor fans will always operate.
MORNING WARM-UP (VAV Only) (Stand-Alone Operation) — When the unit operates in stand-alone mode, morning warm-up occurs when the unit is energized in Occupied mode and return-air temperature (RAT) is below 68 F. Warm-up will not terminate until the RAT reaches 68 F. The heat interlock relay output is energized during morning warm-up. (A field-installed 24-vdc heat interlock relay is required.) The output will be energized until the morning warm-up cycle is complete. Refer to Fig.
Space Temperature Reset Example — The occupied cooling set point is set to 73 F. The Reset Ratio is set to 5. The Reset Limit is set to 20° F. The Reset Ratio determines how many degrees F the temperature is reset. At 72 F, the supply temperature will be reset 5 degrees higher. At 71 F, the supply temperature will be reset 10 degrees higher. At 70 F, the supply temperature will be reset 15 degrees higher.
• When the outdoor air quality is greater than the outdoor air quality set point (ppm) High priority — When the priority is set to high, the IAQ set point controls the outside air damper exclusively, with no regard to comfort conditioning. TIME GUARDt CIRCUIT — The Time Guard function (built into the rooftop control board) maintains a minimum off time of 5 minutes, a minimum on time of 10 seconds, and a 10-second delay between compressor starts.
EVAPORATOR COIL — Remove access panels and clean as required with commercial coil cleaner. To open, loosen the latch bolt using a 7⁄16-in. wrench. Pivot the latch so it is not in contact with the door. Open the door. To shut, reverse the above procedure. NOTE: Disassembly of the top cover may be required under special service circumstances. It is very important that the orientation and position of the top cover be marked on the unit prior to disassembly.
NOTES: 1. Torque set screws on blower wheel to 70 in. lbs ± 2 in. lbs. 2. Torque set screw on propeller fan to 15 in. lbs ± 2 in. lbs. 3. Dimensions are in inches. Fig. 47 — Typical Gas Heating Section 3. Slide fan pulley along fan shaft. 4. Make angular alignment by loosening motor from mounting plate. 5. Retighten pulley. Evaporator Fan Service and Replacement 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Fig. 48 — Gas Heat Section Details Shut off unit power supply. Remove supply-air section panels.
Evaporator-Fan Motor Replacement 1. Shut off unit power supply. 2. Remove upper outside panel and open hinged door to gain access to motor. 3. Fully retract motor plate adjusting bolts. 4. Loosen the two rear (nearest the evaporator coil) motor plate nuts. 5. Remove the two front motor plate nuts and carriage bolts. 6. Slide motor plate to the rear (toward the coil) and remove fan belt(s). 7.
Fig. 50 — Belt Tension Adjustment Fig. 53 — Cooling Charging Chart, 48EJ,EK,EW,EY038-048 Fig. 51 — Condenser-Fan Adjustment Main Burners — For all applications, main burners are factory set and should require no adjustment. MAIN BURNER REMOVAL (Fig. 55) 1. Shut off (field-supplied) manual main gas valve. 2. Shut off power to unit. 3. Remove heating access panel. 4. Disconnect gas piping from gas valve inlet. 5. Remove wires from gas valve. 6. Remove wires from rollout switch. 7.
Crankcase Heater — Each compressor has a crankcase heater to prevent absorption of liquid refrigerant by oil in the crankcase when the compressor is idle. Since power for the crankcase heaters is drawn from the unit incoming power, main unit power must be on for the heaters to be energized. Compressor Lockout Logic — If any of the safeties trip, the circuit will automatically reset (providing the safety has reset) and restart the compressor in 15 minutes.
LEGEND and NOTES for Fig.
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TROUBLESHOOTING Typical refrigerant circuiting diagrams are shown in Fig. 61-63. An algorithm diagram of the IGC (Integrated Gas Unit Controller) control is shown in Fig. 64. LEGEND FPS — Freeze Protection Switch HPS — High-Pressure Switch LPS — Low-Pressure Switch Fig.
LEGEND FPS — Freeze Protection Switch HPS — High-Pressure Switch LPS — Low-Pressure Switch Fig.
LEGEND FPS — Freeze Protection Switch HPS — High-Pressure Switch LPS — Low-Pressure Switch Fig.
LEGEND IDM — Induced-Draft Motor IGC — Integrated Gas Unit Controller NOTE: Thermostat Fan Switch in the ‘‘AUTO’’ position or sensor-equipped unit. Fig.
The alarm codes for the IGC control board are shown in Table 22. Diagnostic LEDs — There are 3 LEDs (red, yellow, and green) on the lower right hand side of the control board. The red light is used to check unit operation and alarms. A constant pulse is normal unit operation. A series of quick blinks indicates an alarm. Refer to Table 23 below for a description of alarms. The yellow LED blinks during transmission with the CCN (Carrier Comfort Network).
Tables 24-26 show the input and output channel designations. Table 24 — I/O Channel Designations Base Module — CV TERMINAL NO. T1-2 T3-4 T5-6 T7-8 T9-10 T11-12 T13-14 T15-16 T17-25 T18-25 T19-25 T20-25 T21-25 T22-25 ASSIGNMENT TERMINAL NO.
PACKAGED SERVICE TRAINING Our packaged service training programs provide an excellent way to increase your knowledge of the equipment discussed in this manual. Product programs cover: • Unit Familiarization • Maintenance • Installation Overview • Operating Sequence A large selection of product, theory, and skills programs is available. All programs include a video cassette and/or slides and a companion booklet. Use these for self teaching or to conduct full training sessions.
START-UP CHECKLIST MODEL NO.: SERIAL NO.: SOFTWARE VERSION (SEE FIG.
HIGH PRESSURE SWITCH SETTING psig LOW PRESSURE SWITCH SETTING psig MOTOR PULLEY PART NUMBER FAN PULLEY PART NUMBER BELT PART NUMBER BELT SIZE in. FILTER QUANTITY FILTER SIZES in.
