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62-11637
7–66
P00204
LOW SUCTION PRESSURE
• ACTIVATION: Suction Pressure is less than -10inHg (-0.34 bar) for more than 30 continuous seconds, or
less than -16inHg (-0.54 bar) for more than 5 seconds at any time during Pretrip.
• UNIT CONTROL: Pretrip will abort and “PRETRIP FAILED IN TEST X” will be displayed in MessageCenter
indicating in which test the suction pressure was too low.
• RESET CONDITION: Auto reset if Pretrip is started again, or Alarm may be manually reset using the dis-
play 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, clear the
alarm(s). (Refer to Note 1 in
Section, page 7-2.) 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 Fan Belts
Check upper and lower fan belt tension & condition. Verify no Glazing, no cracking, no slipping. Refer
to
2.
Check System Pressures
Install manifold gauge set and check and compare compressor discharge & suction pressures with
those shown in Unit Data. Refer to
for instruction on comparison.
3.
Manually Defrost Unit
Defrost unit and terminate automatically. Typical defrost cycle time is 5-20 minutes. Suction pressure
should rise gradually during cycle.
4.
Check Airflow Through Evaporator Coil/Section
a. Inspect coil Ninety percent or more of the coil surface must be undamaged. Coil must be clean.
b. Check airflow (with unit running). Even airflow through the entire coil. No “dead” spots.
c. Check return air bulkhead, air chute. Good air flow. Return air not restricted. Air chute in good condition.
d. Check fan clutch. Must be fully engaged.
e. Check upper and lower fan belt tension & condition. Verify no glazing, cracking, or slipping. Refer to
. Replace if required.
5.
Check Refrigerant Charge
Refer to
6.
Check Expansion Valve (EVXV)
a. Visually inspect valve. Check that coil is seated properly.
b. Check valve. Refer to
7.
Check CSMV
Check compressor suction modulation valve. Refer to
Summary of Contents for Transicold X4 7300
Page 21: ...62 11637 1 6 1 3 SAFETY DECALS ...
Page 22: ...1 7 62 11637 62 03958 ...
Page 23: ...62 11637 1 8 ...
Page 24: ...1 9 62 11637 ...
Page 119: ...62 11637 SECTION 6 MESSAGECENTER PARAGRAPH NUMBER Page 6 1 MESSAGECENTER MESSAGES 6 1 ...
Page 278: ......