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 the servic- ing 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 compressor terminal cover until all electrical sources are disconnected.
4.Relieve all pressure from system before touch- ing or disturbing anything inside terminal box if refrigerant leak is suspected around compres- sor 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. The system 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.
b.Recover refrigerant to relieve all pressure from system using both
c.Cut
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, CAUTION, 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, 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 fins with a fin comb.
4.Verify the following conditions:
a.Make sure that
b.Make sure that air filters are in place. (See Tables 1A and 1B.) Do not operate unit without
c.Make sure that the condensate drain pan and trap are filled with water to ensure proper drainage.
d.Make sure that all tools and miscellaneous loose parts have been removed.
e.Make sure
5.Compressors are internally spring mounted. Do not loosen or remove compressor holddown bolts.
6.Each unit system has 3
7.Ensure electrical wires do not make contact with refrigerant lines.
START-UP
I. UNIT PREPARATION
Make sure that unit has been installed in accordance with these installation instructions and applicable codes. Ensure
II. RETURN-AIR FILTERS
Make sure correct air filters are installed in unit (see Tables 1A and 1B). Do not operate unit without
III. OUTDOOR-AIR INLET SCREENS
IV. COMPRESSOR MOUNTING
Compressors are internally spring mounted. Do not loosen or remove compressor holddown bolts. Remove the tiedown bands that hold the compressors together on 558F103,121,150,151 units.
V. INTERNAL WIRING
Check all electrical connections in unit control boxes; tighten as required. Verify and correct if necessary. Ensure that elec- trical component wiring does not come in contact with refrig- erant tubing or sharp edges.
VI. REFRIGERANT SERVICE PORTS
To service refrigerant service ports, remove compressor access panel. Each unit system has 3
A. High Flow Refrigerant Valves
Two high flow valves are located on the hot gas tube coming out of the compressor and the suction tube going into the compressor. Large black plastic caps identify these valves. These valves have
VII. COMPRESSOR ROTATION
On
1.Connect service gages to suction and discharge pres- sure fittings.