Bryant Air Coold Split System 575B - Manual (Page 16)

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START-UP
I. COMPRESSOR ROTATION (575B,C Units)
On 3-phase units with scroll compressors, it is important to
be certain compressor is rotating in the proper direction. To
determine whether or not compressor 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 start-up.
If the suction pressure does not drop and the discharge
pressure does not rise to normal levels:
1. Note that the condenser fan is probably also rotating
in the wrong direction.
2. Turn off power to the unit, tag disconnect.
3. Reverse any two of the unit power leads.
4. Reapply power to the compressor, verify correct
pressures.
The suction and discharge pressure levels should now move
to their normal start-up levels.
II. COMPRESSOR OVERLOAD
This overload interrupts power to the compressor when
either the current or internal motor winding temperature
becomes excessive, and automatically resets when the inter-
nal temperature drops to a safe level. This overload usually
resets within 60 minutes (or longer). If the internal overload
is suspected of being open, disconnect the electrical power to
the unit and check the circuit through the overload with an
ohmmeter or continuity tester.
III. CYCLE-LOC™ DEVICE (CLO)
The Cycle-LOC device prevents the compressor from starting
or running in a high pressure, loss-of-charge or freezestat
open situation. Reset the Cycle-LOC device by setting the
thermostat to eliminate cooling demand and return it to the
original set point. If the system shuts down again for the
same fault, determine the possible cause before attempting
to reset the Cycle-LOC device.
CAUTION: Compressor crankcase heater must be
on for 24 hours before start-up. After the heater has
been on for 24 hours, the unit can be started. If no time
has elapsed since the preliminary charge step has been
completed, it is unnecessary to wait the 24-hour
period.
CAUTION: Prior to starting compressor, a preliminary
charge of refrigerant must be added to avoid possible
compressor damage.
Fig. 15B — Compressor Mounting — 541A180 Units
SELF-LOCKING
BOLT
SNUBBER WASHER
NEOPRENE
SNUBBER
COMPRESSOR FOOT
Fig. 15A — Compressor Mounting — 575B072 and 575C090,120 Units