16
OPERATIONAL CHECKOUT PROCEDURE
Check if the voltage deviation is within the specified range.
Check that the ampere draw doesn’t exceed the amperage specified on the nameplate.
Check the phase unbalance if there is a three-phase connection. Unbalance should not
exceed 2%.
Check proper phase connections on three phase models only.
Check that the discharge and suction pressures are within limits.
Check the liquid flow in the liquid sight glass. (For fully built models only)
Measure compressor and evaporator superheats. Make proper adjustments if necessary.
Check (if equipped) the defrost and timer controls for proper initiation
and termination settings.
If any malfunction is observed at any time during either start-up or operational checkout
procedures, stop the unit, disconnect power and correct the malfunction accordingly.
Re-check after 48 hours of operation for loose electrical connections, abnormal vibrations
that may have developed, refrigerant charge and correct any probable malfunction observed.
Always re-assemble the enclosure panels when operational check out procedure is
completed. Never leave loose or not properly tightened panels.
MAINTENANCE (ODCU)
Inspect for abnormal indications, vibration, noise.
Inspect and measure temperature of lower housing and determine that it is warm. Make sure
that the upper housing is not sweating.
Inspect all electrical parts for loose connections. Tighten them if necessary
Inspect insulation status of all wires.
Inspect contactors and make sure that they are functioning correctly.
Inspect the fan motors, make sure that the fan blades are tight and all mounting
joints are tight.
Check the crankcase heaters for proper operation. Use an ampere meter to check
for current draw.
The refrigeration systems should be scheduled for check-up, inspection and maintenance
service, at least twice a year, in order to assure a trouble-free operation for many years.
CAUTION: When servicing these systems, the main power supply must be disconnected
and locked off. Extreme care must be used when servicing a unit that requires the power
to be “ON”.
