Carrier 50GL030 Installation, Start-up, And Operating Instructions Manual

Also see for 50GL030: Installation and operating instructions Manual Operating and maintaining guide Guide to operating and maintaining

Contents

PRE-START-UPFailure to observe the following warnings could result inserious injury or death:1. Follow recognized safety practices and wear protectivegoggles when checking or servicing refrigerant system.2. Do not operate compressor or provide any electric power tounit unless compressor terminal cover is in place andsecured.3. Do not remove compressor terminal cover until all electri-cal sources are disconnected.4. Relieve and recover all refrigerant from both high- andlow-pressure sides of system before touching or disturbinganything inside terminal box if refrigerant leak is suspectedaround compressor terminals.5. Never attempt to repair soldered connection while refrig-erant system is under pressure.6. Do not use torch to remove any component. Systemcontains oil and refrigerant under pressure. To remove acomponent, wear protective goggles and proceed as fol-lows:a. Shut off electrical power to unit.b. Relieve and reclaim all refrigerant from system usingboth high- and low-pressure ports.c. Cut component connecting tubing with tubing cutter andremove component from unit.d. Carefully unsweat remaining tubing stubs when neces-sary. Oil can ignite when exposed to torch flame.Proceed as follows to inspect and prepare the unit for initialstartup:1. Remove access panel.2. Read and follow instructions on all WARNING, CAUTION,and INFORMATION labels attached to, or shipped with, unit.3. Make the following inspections:a. Inspect for shipping and handling damages such as brokenlines, loose parts, disconnected wires, etc.b. Inspect for oil at all refrigerant tubing connections and onunit base. Detecting oil generally indicates a refrigerantleak. Leak test all refrigerant tubing connections usingelectronic leak detector, halide torch, or liquid-soap solu-tion. If a refrigerant leak is detected, see Check forRefrigerant Leaks section under Start-Up.c. Inspect all field- and factory-wiring connections. Be surethat connections are completed and tight.d. Inspect coil fins. If damaged during shipping and handling,carefully straighten fins with a fin comb.Verify the following conditions:a. Make sure that condenser-fan blade is correctly positionedin fan orifice. Leading edge of condenser-fan blade shouldbe 1/2 in. maximum from fan orifice (See Fig. 12).b. Make sure that air filter(s) is in place.c. Make sure that condensate drain trap is filled with water toensure proper drainage.d. Make sure that all tools and miscellaneous loose parts havebeen removed.START-UPCHECK FOR REFRIGERANT LEAKS — Proceed as follows tolocate and repair a refrigerant leak and to charge the unit:1. Locate leak and make sure that refrigerant system pressure hasbeen relieved and reclaimed from both high- and low-pressureports.2. Repair leak following accepted practices.NOTE: Replace filter drier whenever the system has been openedfor repair.3. Charge unit with R-410A refrigerant, using a volumetric-charging cylinder or accurate scale. Refer to unit rating platefor required charge.START UP COOLING SECTION AND MAKE ADJUST-MENTSComplete the required procedures given in the Pre-Start- Upsection before starting the unit. Do not jumper any safetydevices when operating the unit. Do not operate the compres-sor when the outdoor temperature is below 40°F (unlessaccessory low-ambient kit is installed). Do not rapid-cycle thecompressor. Allow 5 min between ‘‘on’’ cycles to preventcompressor damage.CHECKING COOLING CONTROL OPERATION — Start andcheck the unit for proper cooling control operation as follows:1. Place room thermostat SYSTEM switch in OFF position.Observe that blower motor starts when FAN switch is placedin ON position and shuts down when FAN switch is placed inAUTO position.2. Place SYSTEM switch in COOL position and FAN switch inAUTO position. Set cooling control below room temperature.Observe that compressor, condenser fan, and evaporatorblower motors start. Observe that cooling cycle shuts downwhen control setting is satisfied. The evaporator fan willcontinue to run for 30 sec.3. When using an auto-changeover room thermostat, place bothSYSTEM and FAN switches in AUTO positions. Observe thatunit operates in heating mode when temperature control is setto ‘‘call for heating’’ (above room temperature) and operatesin cooling mode when temperature control is set to ‘‘call forcooling’’ (below room temperature).IMPORTANT: Three-phase, scroll compressor units (50GL030-060) are direction-oriented. These units must be checked to ensureproper compressor 3-phase power lead orientation. If not correctedwithin 5 min, the internal protector will shut off the compressor.Any two of the 3-phase power leads to the unit must be reversedto correct rotation. When turning backwards, scroll compressorsemit elevated noise levels, and the difference between compressorsuction and discharge pressures may be dramatically lower thannormal.CHECKING AND ADJUSTING REFRIGERANT CHARGE— The refrigerant system is fully charged with R-410A refriger-ant, tested, and factory-sealed.Fig. 12—Fan Blade ClearanceC99009FAN GRILLEMOTOR1/8" MAX BETWEENMOTOR AND FAN HUB MOTOR SHAFT1/2˝11