Carrier 48EZ-A- Manuals

7 Inspection Prior to initial use, and at monthly intervals, all rigging shackles, clevis pins, and straps should be visually inspected for anydamage, evidence of wear, structural deformation, or cracks. Particular attention should be paid to excessive wear at hoisthooking points and load support ar...

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...

10 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 )...

11 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...

12 Horizontal Duct Covers A09061 BasepanDownflow(Vertical)SupplyKnockout BasepanDownflow (Vertical)ReturnKnockout A09060 Fig. 8 -- Supply and Return Duct Opening Return Duct Panels Return & Supply Duct Panels fromUnderside of Base (Alternate Method) Supply Duct Panels A09420 Fig. 9 -- Vertical (...

13 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...

14 POWERSUPPLY FIELD-SUPPLIEDFUSED DISCONNECT HIGH VOLTAGEPOWER LEADS(SEE UNIT WIRINGLABEL) EQUIP GR CONTROL BOX SPLICE BOX LOW-VOLTAGEPOWER LEADS(SEE UNITWIRING LABEL) W Y G R C WHT(W1) YEL(Y) GRN(G) RED(R) BRN(C) THERMOSTAT(TYPICAL) O ORN(O) GRA (Y2) BLU (DH) DH 3-PhaseOnly A09067 Fig. 10 -- High ...

15 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 ...

16 MANIFOLD BURNER BURNER FLAME C99021 Fig. 12 -- Monoport Burner Check Heating Control Start and check the unit for proper heating control operation asfollows (see furnace lighting instructions located on the inside of the control access panel): 1. Place room thermostat SYSTEM switch in the HEAT po...

17 4. Divide number of seconds in Step 3 into 3600 (number of seconds in one hr). 5. Multiply result of Step 4 by the number of cubic feet (cu ft) shown for one revolution of test dial to obtain cubic feet (cuft) of gas flow per hour. 6. Multiply result of Step 5 by Btu heating value of gas to obtai...

18 Step 4 — Start--up Cooling and Make Adjust- ments Complete the required procedures given in the Pre--Start--Upsection before starting the unit. Do not jumper any safety devices when operating the unit. Do not operate the compressor when the outdoor temperature is below 40 ° F (4.4 ° C) (unless ac...

19 Gas Heating Fan Speed Set-up To change the gas heating speed: 1. Remove the vinyl cap off of the desired speed tap wire (Refer to Table 6 for color coding). Table 10 shows thetemperature rise associated with each fan speed for a given static pressure. Make sure that the speed chosen delivers atem...

28 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...

30 BLOWER HOUSING 2 SETSCREWS (HIDDEN) C99085 Fig. 20 -- Removal of Motor and Blower Wheel A07680 Fig. 21 -- Burner Rack Removed FEEDER TUBE STUB TUBE DEFROST THERMOSTAT C99029 Fig. 22 -- Defrost Thermostat Location A07680 Fig. 23 -- Burner Rack Removed Outdoor Fan UNIT OPERATION HAZARD Failure to f...

31 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. 24 -- Defrost Control EXPLOSION, PERSONAL INJURY AND ENVIRONMENTAL HAZARD Failure to follow this warning could result i...

33 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. 26 -- Typical Heat Pump Operation, Cooling Mode COMPRESSOR ACC...

34 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...

35 Table 11 – 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...

5 55 STEP 1 STEP 2 CL O S E STEP 3 OFF ON MAIN STEP 4 STEP 7 OFF ON MAIN STEP 8 STEP 5 72 STEP 10 STEP 6 STEP 9 O P E N A07662 Fig. 5 -- To Start Unit Gas Heat

7 90 STEP 1 STEP 2 CLO SE STEP 3 OFF ON MAIN A07797 Fig. 8 -- To Shut Off Unit Electric Cooling Defrost Mode When your heat pump is providing heat to your home or office andthe outdoor temperature drops below 45 ° F (7.2 ° C), moisture may begin to freeze on the surface of the coil. If allowed to bu...

8 When installing the new filter(s), note the direction of the airflowarrows on the filter frame, which should be pointing at the indoor coil. 3. Reinstall filter access panel ensuring opening is air and watertight. If you have difficulty locating your air filter(s) or have questions concerning prop...

9 Condensate Drain The drain pan and condensate drain line should be checked and cleaned at the same time the cooling coils are checked by yourdealer. Compressor All compressors are factory shipped with a normal charge of thecorrect type and quantity of refrigeration grade oil. A compressor should r...

10 Before you call for service... ...check for several easily--solved problems. If insufficient heating or cooling is suspected: ( ) Check for sufficient airflow. Check the air filter for dirt. Check for blocked return--air or supply--air grilles. Be sure they are openand unobstructed. If these chec...