York YHAU-CE-JE Series, Установка, эксплуатация и обслуживание, Страница: 124 / 136

JOHNSON CONTROLS
124
FORM 155.33-ICOM2.EN.GB
ISSUE DATE: 12/4/2017
SECTION 8 – TROUBLESHOOTING
VACUUM PUMP
When the Purge Abnormal alarm button lights or
the vacuum level of the purging line did not reach the
specified level during the vacuum pump performance
check the whole of the purge line needs to be inspect-
ed. See Table 31 on page 124 . Or, the vacuum pump
may need to be disassembled for inspection. Contact
your local Johnson Controls Service Center.
TABLE 31 - VACUUM PUMP TROUBLESHOOTING
ITEM CAUSE COUNTERMEASURE
1 Deterioration of vacuum pump oil Replace the vacuum pump oil.
2
Wrong operation of purging line switching when
vacuum pump performance was checked. • See Purge Procedure on page 90.
• Confirm the valves are open or closed.
3
Deterioration of vacuum pump belt
Contact your local Johnson Controls Service Center.
4 Leakage in purge pipe lines.
5 Thermal switch is not set properly
6 Solenoid valve or check valve in the purge line is
clogged
ABNORMAL SOLUTION AND REFRIGERANT
LEVELS
The following table displays causes of abnormal lev-
els of solution and refrigerant and countermeasures
against these abnormal limits. If the level of the solu-
tion or refrigerant is abnormal, correct it according to
the following procedure.
ABNORMAL SOLUTION AND REFRIGERANT LEVELS
SECTION
NORMAL
CONDITION
ABNORMAL
CONDITION
CAUSE COUNTERMEASURE
Refrigerant
Overflow
(LG5)
High temperature of
cooling water inlet
temperature.
• See if the cooling water supply rate is conformed to
the specification. (Check the flow meter, discharge
pressure of the cooling water pump, current, etc.) If the
flow rate is insufficient, check the opening ratio of the
flow controller valve and check the strainer for clogging.
• Check the performance of the cooling tower.
• See
Purge Procedure on page 90.
• Check the performance of the vacuum pump.
• Check the purge unit for problems. Purge non-
condensable gas from the absorption chiller-heater.
If partial-load operation continues for a long period,
non-condensable gas tends to stay in the absorber.
In this case, purge directly from the low pressure side
(absorber). See
Purge Procedure on page 90
.
Low temperature of
chilled water outlet
temperature.
Cooling water tube
fouling
Purge trouble
Air leakage
Refrigerant
Tank (LG4)
• Cooling water inlet
temperature is low.
• Setpoint error of
automatic start and
stop switch.
• Check cooling water inlet temperature
• Check the setpoint.
Solution
Tank (LG1)
Purging is insufficient. See Purge Procedure on page 90 .
Valve opening setting
error.
Contact your local Johnson Controls Service Center.
Solution is
crystallized.