PRE-START-UP
WARNING: 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 cov- er 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 com- pressor 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 re- move a component, wear protective goggles and proceed 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, CAUTION, 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 field- and
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
I. UNIT PREPARATION
Make sure that unit has been installed in accordance with these installation instructions and applicable codes. Make
sure
II. RETURN-AIR FILTERS
Make sure correct filters are installed in filter tracks. See Table 1. Do not operate unit without
III. COMPRESSOR MOUNTING
Compressors are internally spring mounted. Do not loosen or remove compressor holddown bolts.
IV INTERNAL WIRING
Check all electrical connections in unit control boxes. Tighten as required. Ensure wiring does not come in contact with refrigerant tubing.
V. GAS PIPING
Check gas piping for leaks.
WARNING: Disconnect gas piping from unit when leak testing at pressure greater than 1/2 psig. Pres- sures greater than 1/2 psig will cause gas valve damage resulting in hazardous condition. If gas valve is sub- jected to pressure greater than 1/2 psig, it must be replaced before use. When pressure testing field- supplied gas piping at pressures of 1/2 psig or less, a unit connected to such piping must be isolated by man- ually closing the gas valve.
VI. REFRIGERANT SERVICE PORTS
To service refrigerant service ports, remove compressor access panel. Each unit system has 4
The Schrader valve on the compressor discharge line that is located under the high pressure switch does not contain a Schrader core in the valve.
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
On
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 evaporator 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.Reapply power to the unit.