62-11637
7–14
00028
CHECK REFRIGERATION SYSTEM
• ACTIVATION:
Condition 1: When system has been operating in Pulldown for more than five minutes and the delta-t
(SAT - RAT) is between -3.0°F (-1.7°C) and +5°F (+2.8°C).
Condition 2: Discharge pressure is not at least 5 psig (0.34 bar) higher than suction pressure for more
than 10 minutes.
• UNIT CONTROL:
Condition 1: If the DTT and/or SAT temperatures are cool enough to allow a defrost the unit will go into
defrost. Following the defrost, if activation criteria for Condition 1 reoccur within 45 minutes of the
defrost cycle, alarm or alarm and shutdown as Configured. If, following the defrost and the 45 minute
wait time the activation criteria for Condition 1 reoccur the unit will go into defrost again. If the DTT and
SAT temperatures are too warm to allow a defrost, alarm or alarm and shutdown as Configured.
Condition 2: Alarm or alarm and shutdown as Configured.
• RESET CONDITION: Auto reset when discharge pressure is more than 20 psig (1.26 bar) above the suction
pressure for five minutes, or alarm has been active and unit has been shutdown more then 14 minutes or
alarm may be manually reset using the display mounted keys or by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active
alarm should clear itself (refer to reset condition above). Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1.
Check Compressor Drive Coupling
Verify that compressor couping is intact and the compressor crankshaft is turning. Repair as required.
2.
Check Sensors and/or Transducers
Using an accurate temperature measurement device or pressure measurement device, check SAT,
RAT, CDP EVOP and CSP readings. Readings must be the same on measurement device & Unit
Data. Refer to
for instruction on pressure reading comparison.
3.
Perform Pretrip Check
Clear Active Alarm list, then run Pretrip & check for any new alarms. Any active alarms must be cor-
rected and cleared before proceeding.
4.
Check
Compressor
a. Perform Pump-Down Test. Refer to
. Must hold a vacuum and not equalize in a short
period of time.
b. Cover condenser and build-up discharge pressure. Must be able to raise pressure to 400 psig (27.2 bar).
c. Disassemble and inspect compressor valve plates, cylinder suction valves, cylinder discharge valves
and pistons, etc. Must be intact, clean, and in good working order.
Содержание Transicold X4 7300
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