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WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in death, serious
personal injury and/or property damage.
Never use non-certified refrigerants in this product. Non-
certified refrigerants could contain contaminates that could
lead to unsafe operating conditions. Use ONLY refrigerants
that conform to AHRI Standard 700.
Replacing Compressor
NOTE: Only factory-trained service technicians should remove
and replace compressor units.
CAUTION
INSTALLATION SITE DAMAGE
Failure to follow this caution can result in damage to
equipment location site.
R-410A refrigerant contains polyolester (POE) oil that can
damage the roof membrane. Caution should be taken to
prevent POE oil from spilling onto the roof surface.
The factory also recommends that the suction and discharge
lines be cut with a tubing cutter instead of using a torch to
remove brazed fittings.
COMPRESSOR ROTATION
CAUTION
INSTALLATION SITE DAMAGE
Failure to follow this caution can result in damage to
equipment location site.
R-410A refrigerant contains polyolester (POE) oil that can
damage the roof membrane. Caution should be taken to
prevent POE oil from spilling onto the roof surface.
The factory also recommends that the suction and discharge
lines be cut with a tubing cutter instead of using a torch to
remove brazed fittings.
NOTE: When the compressor is rotating in the wrong direction,
the unit makes an elevated level of noise and does not provide
cooling.
On 3-phase units with scroll compressors, it is important to be
certain compressor is rotating in the proper direction. To deter-
mine whether or not compressor is rotating in the proper
direction:
1.
Connect service gauges 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 start-up.
NOTE: If the suction pressure does not drop and the discharge
pressure does not rise to normal levels, the evaporator fan is prob-
ably also rotating in the wrong direction.
4.
Turn off power to the unit.
5.
Reverse any two of the three unit power leads.
6.
Reapply electrical power to the compressor. The suction
pressure should drop and the discharge pressure should
rise which is normal for scroll compressors on start-up.
7.
Replace compressor if suction/discharge pressures are not
within specifications for the specific compressor.
The suction and discharge pressure levels should now move to
their normal start-up levels.
Filter Drier
Replace whenever refrigerant system is exposed to atmo-
sphere. Only use factory specified liquid-line filter driers with
working pressures no less than 650 psig. Do not install a suc-
tion-line filter drier in liquid line. A liquid-line filter drier de-
signed for use with Puron refrigerant is required on every unit.
Condenser-Fan Adjustment
1.
Shut off unit power supply. Install lockout tag.
2.
Remove condenser-fan assembly (grille, motor, and fan).
See Fig. 31.
3.
Loosen fan hub setscrews.
4.
Adjust fan height by pushing fan until it stops on the fan
shaft.
5.
Tighten set screw to 60 in.-lb (6.78 Nm).
6.
Replace condenser-fan assembly. When replacing the
condenser-fan assembly follow the screw pattern sequence
shown in Fig. 32. The screws must be replaced in the
sequence shown in the figure.
Fig. 31 — Condenser Fan Adjustment
17
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Troubleshooting
