JOHNSON CONTROLS
129
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
7
SECTION 7 – MAINTENANCE
When inspecting and maintaining the absorption chill-
er-heater, observe the following items:
•
Never splash water over the electrical parts in-
stalled to the control panel and absorption chiller-
heater.
•
Do not change the set values of the control de-
vices and safety switches without permission.
•
Do not turn the internal cycle control valve of the
absorption chiller-heater without permission.
•
When replacing the oil in the vacuum pump, be
sure to turn OFF the main circuit breaker (MCB1)
in the control panel.
EXHAUST DUCT INSPECTION
Inspect the exhaust duct periodically to check for a gas
leak. If you smell gas, do not operate the machine or
manipulate the switches until the gas smell vanishes.
VALVE INSPECTION
The chiller-heater is equipped with a refrigerant man-
ual blow valve (V8) that blows refrigerant from the re-
frigerant tank to the absorber directly. See
The valve must not be tampered with or have its set-
tings altered. Daily maintenance or inspection is the
only reason to touch the valve.
During service and maintenance work, be
sure to turn OFF the main circuit breaker
(MCB1) and fully close the main valve of
fuel gas line. If not, it may cause electric
shock and burn.
Contact your local Johnson Controls
Service Office for inspection and main
-
tenance of the unit. Improper inspection
and maintenance can not only cause a
machine problem but also injure workers.
SOLENOID VALVES
The absorption chiller-heater is equipped with the fol-
lowing solenoid valves.
TABLE 34 -
SOLENOID VALVES
SOLENOID VALVE
NAME
SYMBOL
FUNCTION
Purge solenoid valve (1)
SV1
Close vacuum pump
piping
Purge solenoid valve (2)
SV2
Refrigerant blow
solenoid valve
SV3
Close automatic
refrigerant blow piping
PUMP SHUT OFF VALVES
The chiller-heater is equipped with the pump shut off
valves shown in
They are
used for inspection of the pumps.
If the absorption chiller-heater is operated with incor-
rect valve settings, the pump may be damaged. Do
NOT tamper with the valves.
AIR PURGE VALVES AND DRAIN VALVES
The chiller-heater is equipped with air purge valves
and drain valves for chilled/hot water and cooling
water. They are used to drain the chilled/hot water,
and cooling water. They also purge air when water is
supplied.
PURGE VALVES
The chiller-heater is equipped with the purging valves
Figure 51 on page 131 , Figure 52 on page
and
. For operation of
those valves, see
