PRE-START-UP
WARNING: Failure to observe the following warn- ings could result in serious personal injury:
1.Follow recognized safety practices and wear protective goggles when checking or servicing refrigerant system.
2.Do not operate compressor or provide any elec- tric power to unit unless compressor terminal cover is in place and secured.
3.Do not remove compressor terminal cover until all electrical sources are disconnected and tagged.
4.Relieve all pressure from system before touch- ing or disturbing anything inside compressor terminal box if refrigerant leak is suspected around compressor terminals. Use accepted methods to recover refrigerant.
5.Never attempt to repair soldered connection while refrigerant system is under pressure.
6.Do not use torch to remove any component. Sys- tem contains oil and refrigerant under pres- sure. To remove a component, wear protective goggles and proceed as follows:
a.Shut off electrical power to unit and install lockout tag.
b.Relieve all pressure from system using both high- and
c.Cut component connection tubing with tub- ing cutter and remove component from unit.
d.Carefully unsweat 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 unit.
3.Make the following inspections:
a.Inspect for shipping and handling damages such as broken lines, loose parts, or disconnected wires.
b.Inspect for oil at all refrigerant tubing connec- tions and on unit base. Detecting oil generally indicates a refrigerant leak.
c.Inspect all field- and
d.Inspect coil fins. If damaged during shipping and handling, carefully straighten fins with a fin comb.
4.Verify the following conditions:
a.Make sure that
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.
e.Ensure belt and blower pulley are properly aligned and at correct tension.
START-UP
I. UNIT PREPARATION
Make sure that unit has been installed in accordance with these installation instructions and applicable codes.
II. RETURN AIR FILTERS
Make sure correct filters are installed in unit (see Table 1). Do not operate unit without
III. OUTDOOR-AIR INLET SCREEN
IV. COMPRESSOR MOUNTING
Compressors are internally spring mounted. Do not loosen or remove compressor holddown bolts.
V. INTERNAL WIRING
Check all electrical connections in unit control boxes; tighten as required. Ensure wiring does not come into direct contact with refrigerant tubing or sharp edges.
VI. REFRIGERANT SERVICE PORTS
Each refrigerant system has 4
VII. HIGH FLOW VALVES
Located on the compressor hot gas and suction tubes are High Flow Valves. Large black plastic caps distinguish these valves with
VIII. COMPRESSOR ROTATION
It is important to be certain the scroll compressor is rotating in the proper direction. To determine whether or not com- pressor is rotating in the proper direction:
1.Connect service gages to suction and discharge pres- sure fittings.
2.Energize the compressor.
3.The suction pressure should drop and the discharge pressure 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 indoor fan is probably also rotating in the wrong direction.
2.Turn off power to the unit and tag disconnect.
3.Reverse any two of the unit power leads.
4.Turn on power to the unit. Reenergize compressor.
The suction and discharge pressure levels should now move to their normal