PRE-START-UP
Failure to observe the following warnings could result in serious personal injury.
1.Follow recognized safety practices and wear protective goggles when checking or the servicing refrigerant system.
2.Do not operate the compressor or provide any electric power to the unit unless the compressor terminal cover is in place and secured.
3.Do not remove the compressor terminal cover until all electrical sources are disconnected.
4.Relieve all pressure from the system before touching or disturbing anything inside the compressor terminal box if refrigerant leak is suspected around the compressor terminals.
5.Never attempt to repair a soldered connection while the refrigerant system is under pressure.
6.Do not use torch to remove any component. The sys- tem contains oil and refrigerant under pressure. To remove a component, wear protective goggles and pro- ceed as follows:
a.Shut off gas and then electrical power to the unit. Install lockout tag.
b.Relieve all pressure from the system using both
c.Cut the component connection tubing with a tubing cutter, and remove the component from the unit.
d.Carefully unsweat the remaining tubing stubs when necessary. Oil can ignite when exposed to torch flame.
Proceed as follows to inspect and prepare the unit for initial
1.Remove all access panels.
2.Read and follow instructions on all WARNING, CAU- TION, and INFORMATION labels attached to, or shipped with, the unit.
3.Make the following inspections:
a.Inspect for shipping and handling damages such as broken lines, loose parts, or disconnected wires, etc.
b.Inspect for oil at all refrigerant tubing connections and on unit base. Detecting oil generally indicates a refrigerant leak.
c.Inspect all
d.Inspect coil fins. If damaged during shipping and handling, carefully straighten the fins with a fin comb.
4.Verify the following conditions:
a.Make sure that condenser fan blade is correctly positioned in the fan orifice. See
b.Make sure that air filter(s) is in place.
c.Make sure that condensate drain trap is filled with water to ensure proper drainage.
d.Make sure that all tools and miscellaneous loose parts have been removed.
START-UP
Use the following information and
Unit Preparation — Check that unit has been installed in accordance with these installation instructions and all applica- ble codes.
Compressor Mounting — Compressors are internally spring mounted. Do not loosen or remove compressor hold- down bolts.
Refrigerant Service Ports — Each independent re- frigerant system has a total of 3
Crankcase Heater(s) — Crankcase heaters are ener- gized as long as there is power to the unit and the compressor is not operating.
IMPORTANT: Unit power must be on for 24 hours prior to
Compressor Rotation — On
1.Connect service gages to suction and discharge pressure fittings.
2.Energize the compressor.
3.The suction pressure should drop and the discharge pres- sure should rise, as is normal on any
If the suction pressure does not drop and the discharge pres- sure does not rise to normal levels:
1.Note that the evaporator fan is probably also rotating in the wrong direction.
2.Turn off power to the unit and install lockout tag.
3.Reverse any two of the unit power leads.
4.Turn on power to the unit.
The suction and discharge pressure levels should now move to their normal
NOTE: When the compressor is rotating in the wrong direc- tion, the unit makes an elevated level of noise and does not provide heating or cooling.
Compressor damage will occur if rotation is not immedi- ately corrected.
Internal Wiring — Check all electrical connections in unit control boxes; tighten as required.
Subcooler Heat Exchanger (SHX) — The subcool- er heat exchanger adds approximately 10 to 15° F of sub- cooling to the system. Check all valves and TXV (thermostatic expansion valve).
Evaporator Fan — Fan belt and variable pulleys are
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