SECTION 7 – MAINTENANCE
FORM 155.32-ICOM2.EN.UL
ISSUE DATE:1/10/2018
136
JOHNSON CONTROLS
REFRIGERANT REFINING METHOD
With an increase in the operation time of the chiller-heater, some of the solution can mix in
with the refrigerant. Mixing the solution and the refrigerant lowers the refrigerating capacity.
To prevent this, the refrigerant must be refined periodically.
Refine the refrigerant according to the following procedure. The chiller-heater must be
operating to refine refrigerant.
When refining refrigerant, operate the absorption chiller-heater under a low load (50% or
less) for higher refining efficiency. Note that the refrigerating capacity is dramatically
reduced during the refrigerant refining operation.
1. Remove the cap of the refrigerant manual blow valve.
2. Turn the spindle in the valve to the left using an 8 mm hexagon wrench to start refin-
ing the refrigerant.
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: Remember: Only deionized water may be used as the refrigerant in the chiller-
heater!
NOTE: For the location of the refrigerant manual blow valve, see Figure 59 on page 124.
NOTE: 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 immediately and fully.
