JOHNSON CONTROLS
131
FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
7
SECTION 7 – MAINTENANCE
When inspecting and maintaining the absorption chill-
er, observe the following items:
• Never splash water over the electrical parts in-
stalled to the control panel and absorption chiller.
• 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 without permission.
• When replacing the oil in the vacuum pump, be
sure to turn OFF the main circuit breaker (MCB1)
in the control panel.
VALVE INSPECTION
The chiller is equipped with a refrigerant manual blow
valve (V8) that blows refrigerant from the refrigerant
tank directly into the absorber (see Figure 51 on page
133 and Figure 28 on page 82).
The valve must not be tampered with or settings al-
tered, except for daily maintenance and inspection.
During service and maintenance work, be
sure to turn OFF the main circuit breaker
(MCB1) and fully close the main valve of
steam line. If not, it may cause electric
shock and burn.
Contact your local Johnson Controls
Service Ofce for inspection and mainte-
nance of the machine. Improper inspec-
tion and maintenance can cause a chiller
malfunction or injury.
SOLENOID VALVES
The absorption chiller is equipped with the following
solenoid valves.
TABLE 27 - 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 is equipped with the pump shut off valves
shown in Figure 56 on page 148. They are used for
inspection of the pumps.
If the absorption chiller is operated with incorrect valve
settings, the pump may be damaged. Do NOT tamper
with the valves.
AIR PURGING VALVES AND DRAINING
VALVES
The chiller is equipped with air purge valves and drain
valves for chilled water, and cooling water. It is equipped
with a drain valve for the steam condensate (drain).
They are used to drain the chilled water, cooling water,
steam condensate (drain), and purge air when water is
supplied.
PURGING VALVES
The chiller is equipped with the purging valves shown
in Figure 51 on page 133. For operation of those
valves, see Purge Procedure on page 132.
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