Carrier 48EZ(N)-A- Manuals

7 hooking points and load support areas. Materials showing any kindof wear in these areas must not be used and should be discarded. UNIT FALLING HAZARD Failure to follow this warning could result in personal injury or death.Never stand beneath rigged units or lift over people. ! WARNING PROPERTY DAM...

8 A 1/8--in. (3.2 mm) NPT plugged tapping, accessible for test gaugeconnection, must be installed immediately upstream of the gas supply connection to the gas valve.When installing the gas supply line, observe local codes pertaining to gas pipe installations. Refer to the NFGC NFPA 54/ANSI Z223.1 la...

9 Step 9 — Install Duct Connections The unit has duct flanges on the supply-- and return--air openingson the side and bottom of the unit. For downshot applications, the ductwork connects to the roof curb (See Fig. 2 and 3 for connection sizes and locations). Configuring Units for Downflow (Vertical)...

11 Table 1 -- Physical Data -- Unit 48EZ--A (Cont’d) UNIT SIZE 48EZ --- A 48090 48115 48130 60090 60115 60130 NOMINAL CAPACITY --- ton 4 4 4 5 5 5 OPERATING WEIGHT --- lb (kg) 482 219 482 219 482 219 507 230 507 230 507 230 COMPRESSORS Scroll Quantity 1 REFRIGERANT (R --- 410A) Quantity --- lb (kg )...

12 Step 10 — Install Electrical Connections ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death.The unit cabinet must have an uninterrupted, unbroken electrical ground. This ground may consist of an electrical wire connected to the unit ground screw in the...

13 Control Voltage Connections Do not use any type of power--stealing thermostat. Unit control problems may result.Use no. 18 American Wire Gage (AWG) color--coded, insulated (35 _ C minimum) wires to make the control voltage connections between the thermostat and the unit. If the thermostat is loca...

14 4. Verify the following conditions: a. Make sure gas line is free of air. Before lighting the unit for the first time, perform the following with the gasvalve in the “OFF” position: NOTE : If the gas supply pipe was not purged before connecting the unit, it will be full of air. It is recommended ...

15 integrated gas unit controller (IGC) has the capability toautomatically reduce the evaporator “ON” delay and in- crease the evaporator “OFF” delay in the event of high ductstatic and/or partially--clogged filter. Check Gas Input Check gas input and manifold pressure after unit start--up (SeeTable...

16 EXAMPLE: Assume that the size of test dial is 1 cu ft, onerevolution takes 32 sec, and the heating value of the gas is 1050 Btu/ft 3 . Proceed as follows: 1. 32 sec. to complete one revolution.2. 3600 ÷ 32 = 112.5. 3. 112.5 x 1 =112.5 ft 3 of gas flow/hr. 4. 112.5 x 1050 = 118,125 Btuh input. If ...

17 placed in ON position and shuts down when FAN switch isplaced in AUTO position. 2. Place SYSTEM switch in COOL position and FAN switch in AUTO position. Set cooling control below roomtemperature. Observe that compressor, condenser fan, and evaporator blower motors start. Observe that cooling cycl...

18 2. Remove the current speed tap wire from the “LOW” terminal on the interface fan board (IFB) (See Fig. 13) and place vinyl cap over the connector on the wire. 3. Connect the desired speed tap wire to the “LOW” terminal on the interface fan board (IFB). Two Cooling Fan Speeds Set-up (Dehumidifica...

32 MAINTENANCE To ensure continuing high performance and to minimize the possibility of premature equipment failure, periodic maintenancemust be performed on this equipment. This combination heating/cooling unit should be inspected at least once each year bya qualified service person. To troubleshoo...

34 BLOWER HOUSING 2 SETSCREWS (HIDDEN) C99085 Fig. 19 -- Removal of Motor and Blower Wheel A07680 Fig. 20 -- Burner Rack Removed FEEDER TUBE STUB TUBE DEFROST THERMOSTAT C99029 Fig. 21 -- Defrost Thermostat Location A07680 Fig. 22 -- Burner Rack Removed Outdoor Fan UNIT OPERATION HAZARD Failure to f...

35 OF2 OF1 ON QUIET SHIFT 120 30 60 60 30 90 INTER V AL TIMER OFF P3 DFT O R W 2 Y C T2 C C O DFT T1 Y P1 J1 SPEEDUP SpeedupPins Defrost intervalDIP switches QuietShift A08020 Fig. 23 -- Defrost Control EXPLOSION, PERSONAL INJURY AND ENVIRONMENTAL HAZARD Failure to follow this warning could result i...

37 COMPRESSOR ACCUMULATOR OUTDOOR COIL INDOOR COIL LCS LEGEND HPS – High Pressure SwitchLCS – Loss of Charge Switch Accurater ® Metering De vice Arrow indicates direction of flo w TXV in Metering Position Bypass Position HP S C03011 Fig. 25 -- Typical Heat Pump Operation, Cooling Mode COMPRESSOR ACC...

38 Servicing Systems on Roofs and with Synthetic materials POE (polyolester) compressor lubricants are known to cause long term damage to some synthetic roofing materials.Exposure, even if immediately cleaned up, may cause embrittlement (leading to cracking) to occur in one year or more.When perform...

39 Table 12 – Troubleshooting Guide -- Cooling or Heat Pump Heating Mode SYMPTOM CAUSE REMEDY Compressor and Outdoor fan will not start. Power Failure Call power company. Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker. Defective thermostat, contactor, transformer, or con...

7 hooking points and load support areas. Materials showing any kindof wear in these areas must not be used and should be discarded. UNIT FALLING HAZARD Failure to follow this warning could result in personal injury or death.Never stand beneath rigged units or lift over people. ! WARNING PROPERTY DAM...

8 A 1/8--in. (3.2 mm) NPT plugged tapping, accessible for test gaugeconnection, must be installed immediately upstream of the gas supply connection to the gas valve.When installing the gas supply line, observe local codes pertaining to gas pipe installations. Refer to the NFGC NFPA 54/ANSI Z223.1 la...

9 Step 9 — Install Duct Connections The unit has duct flanges on the supply-- and return--air openingson the side and bottom of the unit. For downshot applications, the ductwork connects to the roof curb (See Fig. 2 and 3 for connection sizes and locations). Configuring Units for Downflow (Vertical)...

11 Table 1 -- Physical Data -- Unit 48EZ--A (Cont’d) UNIT SIZE 48EZ --- A 48090 48115 48130 60090 60115 60130 NOMINAL CAPACITY --- ton 4 4 4 5 5 5 OPERATING WEIGHT --- lb (kg) 482 219 482 219 482 219 507 230 507 230 507 230 COMPRESSORS Scroll Quantity 1 REFRIGERANT (R --- 410A) Quantity --- lb (kg )...

12 Step 10 — Install Electrical Connections ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death.The unit cabinet must have an uninterrupted, unbroken electrical ground. This ground may consist of an electrical wire connected to the unit ground screw in the...

13 Control Voltage Connections Do not use any type of power--stealing thermostat. Unit control problems may result.Use no. 18 American Wire Gage (AWG) color--coded, insulated (35 _ C minimum) wires to make the control voltage connections between the thermostat and the unit. If the thermostat is loca...

14 4. Verify the following conditions: a. Make sure gas line is free of air. Before lighting the unit for the first time, perform the following with the gasvalve in the “OFF” position: NOTE : If the gas supply pipe was not purged before connecting the unit, it will be full of air. It is recommended ...

15 integrated gas unit controller (IGC) has the capability toautomatically reduce the evaporator “ON” delay and in- crease the evaporator “OFF” delay in the event of high ductstatic and/or partially--clogged filter. Check Gas Input Check gas input and manifold pressure after unit start--up (SeeTable...

16 EXAMPLE: Assume that the size of test dial is 1 cu ft, onerevolution takes 32 sec, and the heating value of the gas is 1050 Btu/ft 3 . Proceed as follows: 1. 32 sec. to complete one revolution.2. 3600 ÷ 32 = 112.5. 3. 112.5 x 1 =112.5 ft 3 of gas flow/hr. 4. 112.5 x 1050 = 118,125 Btuh input. If ...

17 placed in ON position and shuts down when FAN switch isplaced in AUTO position. 2. Place SYSTEM switch in COOL position and FAN switch in AUTO position. Set cooling control below roomtemperature. Observe that compressor, condenser fan, and evaporator blower motors start. Observe that cooling cycl...

18 2. Remove the current speed tap wire from the “LOW” terminal on the interface fan board (IFB) (See Fig. 13) and place vinyl cap over the connector on the wire. 3. Connect the desired speed tap wire to the “LOW” terminal on the interface fan board (IFB). Two Cooling Fan Speeds Set-up (Dehumidifica...

32 MAINTENANCE To ensure continuing high performance and to minimize the possibility of premature equipment failure, periodic maintenancemust be performed on this equipment. This combination heating/cooling unit should be inspected at least once each year bya qualified service person. To troubleshoo...

34 BLOWER HOUSING 2 SETSCREWS (HIDDEN) C99085 Fig. 19 -- Removal of Motor and Blower Wheel A07680 Fig. 20 -- Burner Rack Removed FEEDER TUBE STUB TUBE DEFROST THERMOSTAT C99029 Fig. 21 -- Defrost Thermostat Location A07680 Fig. 22 -- Burner Rack Removed Outdoor Fan UNIT OPERATION HAZARD Failure to f...

35 OF2 OF1 ON QUIET SHIFT 120 30 60 60 30 90 INTER V AL TIMER OFF P3 DFT O R W 2 Y C T2 C C O DFT T1 Y P1 J1 SPEEDUP SpeedupPins Defrost intervalDIP switches QuietShift A08020 Fig. 23 -- Defrost Control EXPLOSION, PERSONAL INJURY AND ENVIRONMENTAL HAZARD Failure to follow this warning could result i...

37 COMPRESSOR ACCUMULATOR OUTDOOR COIL INDOOR COIL LCS LEGEND HPS – High Pressure SwitchLCS – Loss of Charge Switch Accurater ® Metering De vice Arrow indicates direction of flo w TXV in Metering Position Bypass Position HP S C03011 Fig. 25 -- Typical Heat Pump Operation, Cooling Mode COMPRESSOR ACC...

38 Servicing Systems on Roofs and with Synthetic materials POE (polyolester) compressor lubricants are known to cause long term damage to some synthetic roofing materials.Exposure, even if immediately cleaned up, may cause embrittlement (leading to cracking) to occur in one year or more.When perform...

39 Table 12 – Troubleshooting Guide -- Cooling or Heat Pump Heating Mode SYMPTOM CAUSE REMEDY Compressor and Outdoor fan will not start. Power Failure Call power company. Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker. Defective thermostat, contactor, transformer, or con...