Table 49 - Chilled Or Hot Water Suspension; Table 50 - Pump(S) Overloaded Or Overheated - York EX Series Installation, Operation & Maintenance Instructions Manual

SECTION 8 – TROUBLESHOOTING
In the case of c water suspension, the absorp-
hilled/hot
tion chiller-heater does not dilute the solution, but
stops immediately. If the absorption chiller-heater is
left as it is, the solution in it may be crystallized in 4-5
hours. To prevent this, dilute the solution according the
instructions shown in Manual Refrigerant Blow Down
and Diluting Method on page 142 .
TABLE 49 - CHILLED OR HOT WATER
SUSPENSION
ITEM CAUSE
Chilled/hot water pump
1
has a problem.
Chilled/hot water flow rate
2
is low.
Pressure transfer pipe of
3
water suspension switch
is clogged.
Water suspension switch
4
is broken.
If the chiller-heater has a pump problem, it does not
perform the diluting operation but stops immediately.
If left as it is, the solution in it may be crystallized in
4-5 hours. To prevent this, contact your local Johnson
Controls Service Office immediately.
TABLE 50 - PUMP(S) OVERLOADED OR
OVERHEATED
ITEM
1 Bearings of the pump are worn or clogged.
2 Pump is damaged by cavitation caused by low liquid level.
3 Thermal switch is not set properly.
4 Internal cycle control valve is not set properly.
5 Filter in the pump is clogged.
6 Solution is crystallized.
7 Circuit breaker has tripped.
168
Check the chilled/hot water pump for a problem.
• Check to see if the chilled/hot flow- rate is below the setpoint of the water
suspension switch. If it is low, check the flow controller, check the strainer for
clogging.
• Check the opening ratio of the flow control valve.
Contact your local Johnson Controls Service Office.
CAUSE
FORM 155.32-ICOM1.EN.GB
COUNTERMEASURE
COUNTERMEASURE
Contact your local Johnson Controls Service
Office.
ISSUE DATE: 10/13/2017
JOHNSON CONTROLS