JOHNSON CONTROLS
135
SECTION 7 – MAINTENANCE
FORM 155.30-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
7
REFRIGERANT REFINING METHOD
NOTE: Only deionized water may be used
as the refrigerant in the chiller!
With an increase in the operation time of the chiller,
some of the solution can mix in with the refrigerant.
Mixing the solution and the refrigerant lowers the re-
frigerating capacity. To prevent this, the refrigerant
must be refined periodically.
Refine the refrigerant according to the following pro-
cedure. The chiller must be operating to refine refriger-
ant.
When refining refrigerant, operate the absorption chill-
er under a low load (50% or less) for higher refining
efficiency. Note that the refrigerating capacity is dra-
matically reduced during the refrigerant refining op-
eration.
1. Remove the cap of the refrigerant manual blow
valve.
NOTE: For the location of the refriger-
ant manual blow valve, see
.
2. Turn the spindle in the valve to the left using an
0.3 inch hexagon wrench to start refining the re
-
frigerant.
3. After the refining process is complete, close the
spindle in the valve (turn it to the right until it
stops).
4. Return the valve cap. There is an O-ring between
the cap and valve. When fitting the cap, make sure
that the O-ring is set normally.
NOTE: The time required for refinement
of the refrigerant depends on the current
load condition. Constantly check the liq-
uid level in the refrigerant tank while the
refrigerant is refined. If the refrigerant
liquid level appears in the level gauge of
the refrigerant tank, close the valve im-
mediately and fully.
MANUAL REFRIGERANT BLOWDOWN AND
DILUTING METHOD
When the chiller stops suddenly due to a power failure,
the solution can become crystallized. If this happens,
dilute the solution manually according to the following
procedure.
NOTE: Perform the following procedure
immediately after the power is restored.
1. Press the Forced Dilution
ON
button The solution
pumps and the refrigerant pump start.
2. Remove the cap of the refrigerant manual blow
valve.
NOTE: For the location of the refriger-
ant manual blow valve, see
.
3. Turn the spindle in the valve to the left with the
0.3 inch hexagon wrench. The refrigerant in the
refrigerant tank is diverted into the absorber.
4. Watch the liquid level of the refrigerant tank. Im-
mediately after the refrigerant liquid level appears
in the level gauge of the refrigerant tank, close the
valve (turn it to the right until it stops).
5. Press the Refrigerant Pump
Stop
button. The re-
frigerant pump stops.
6. Let the solution pump operate independently for
30 minutes.
7. Press the Forced Dilution
OFF
button to stop the
solution pump.
8. Press the Refrigerant Pump
Auto
button.
9. Return the valve cap. There is an O-ring between
the cap and valve. When fitting the cap, make sure
that the O-ring is set normally.
