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Table 4-1. Troubleshooting - continued - TM-5-4120-339-140078
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TM-5-4120-339-14 Air Conditioner Vertical Compact 9 000 BTU/HR 208 Volts 3-Phase 50/60 HZ Tierany Model TM9KV-208-3-60 Manual
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Table 4-1. Troubleshooting - continued - TM-5-4120-339-140080
TM 5-4120-339-14
Table 4-1. Troubleshooting (continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
AIR CONDITIONER NOISY DURING OPERATION (continued)
Adjust expansion valve if superheat is not correct (paragraph 4-15).
Step 4.
Inspect quench valve and check superheat (paragraph 4-16).
Repair or replace damaged or defective quench valve.
Adjust quench valve if
superheat is not correct (paragraph 4-16).
6.
AIR CONDITIONER STOPS DUE TO HIGH PRESSURE SWITCH TRIPPING
Step 1.
Check air conditioner operating pressures for excessive refrigerant in system (table 4-3).
Release excess refrigerant from system until the proper charge is attained
Step 2.
Check for restriction in condenser air flow.
Clean condenser coil and/or remove restriction.
7.
AIR CONDITIONER OPERATES CONTINUOUSLY ON COOLING CYCLE.
Step 1.
Check for insufficient refrigerant in system (bubbles in sight glass).
Add refrigerant (paragraph 4-11).
Step 2.
If adding refrigerant to system does not clear up bubbles in sight glass, there may be air in
the system.
Open system and remove refrigerant (figure 4-2), purge system (paragraph 4-8),
evacuate  system  (figure  4-4),  and  recharge  the  system  with  refrigerant
8.
SIGHT GLASS APPEARS YELLOW INSTEAD OF GREEN
Step 1.
Yellow appearance of sight glass is caused by contamination in the refrigerant.
Open system and remove refrigerant (figure 4-2), remove dehydrator (figure 4-16),
purge and dry system (paragraph 4-8), install new dehydrator (figure 4-16), evacuate
system (figure 4-4) and recharge system with refrigerant (paragraph 4-10).
4-5

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