JOHNSON CONTROLS
142
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
SECTION 7 – MAINTENANCE
REFRIGERANT REFINING METHOD
Remember: Only deionized water may
be used as the refrigerant in the chiller-
heater!
With an increase in the operation time of the chiller-
heater, some of the solution can mix in with the refrig-
erant. Mixing the solution and the refrigerant lowers
the refrigerating capacity. To prevent this, the refriger-
ant must be refined periodically.
Refine the refrigerant according to the following pro-
cedure. The chiller-heater must be operating to refine
refrigerant.
When refining refrigerant, operate the absorption chill-
er-heater under a low load (50% or less) for higher re-
fining efficiency. Note that the refrigerating capacity
is dramatically reduced during the refrigerant refining
operation.
1. Remove the cap of the refrigerant manual blow
valve.
For the location of the refrigerant manual
blow valve, see Figure 51 on page 131
and Figure 52 on page 132 .
2. Turn the spindle in the valve to the left using an 8
mm hexagon wrench to start refining the refriger
-
ant.
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.
The time required for refinement of the
refrigerant depends on the current load
condition. Constantly check the liquid
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 BLOW DOWN AND
DILUTING METHOD
When the chiller-heater stops suddenly due to a power
failure, the solution can become crystallized. If this
happens, dilute the solution manually according to the
following procedure.
Perform the following procedure immedi-
ately after the power is restored.
1. Press the Forced Dilution
ON
button The solution
pump and the refrigerant pump start.
2. Remove the cap of the refrigerant manual blow
valve.
For the location of the refrigerant manual
blow valve, see Figure 51 on page 131
and Figure 52 on page 132 .
3. Turn the spindle in the valve to the left with the 8
mm hexagon wrench. The refrigerant in the refrig-
erant 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.
