SECTION 7 – MAINTENANCE
FORM 155.32-ICOM2.EN.UL
ISSUE DATE:1/10/2018
122
JOHNSON CONTROLS
PUMP SHUT OFF VALVES
The chiller-heater is equipped with the pump shut off valves. See
and
. They are used for inspection of the pumps.
If the absorption chiller-heater is operated with incorrect 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. See
,
For operation of those
valves, see
START THE CHILLER-HEATER AFTER IT HAS BEEN STOPPED FOR
A LONG PERIOD
When starting the chiller-heater after stopping it for a long period, check it according to the
following procedure.
Checks Before Operation Starts
1. Check the insulation of the Control Center and electric system.
2. Check the operation of the Control Center and safety devices.
3. Check that the refrigerant blow valve V8 is closed.
4. Check the vacuum level in the machine. Use pressure gauge of the high-temperature
generator.
5. Check the fuel gas supply.
6. Press the Refrigerant Pump
Stop
button on the Setting screen.
If the checks show no problems, start the chiller-heater.
Checks After Operation Starts
1. 10-15 minutes after the chiller-heater and the solution pump start, check the level
gauge of the refrigerant tank.
2. If the refrigerant level is within the level gauge, press the Refrigerant Pump
Auto
but-
ton.
3. Observe the operation for a while. Check that the refrigerant liquid level does not
drop.
4. Use the procedure shown in
to purge air from the low
pressure side (absorber).
NOTE: It should be less than -0.1 MPaG.
NOTE: Only deionized water may be used as the refrigerant in the chiller-heater.
