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55908014-06
Units are supplied with the following male flare connections (sizes in inches):
OUTDOOR UNIT CKR30 CKR50 CKR80
LIQUID
3/8" 3/8" 1/2"
SUCTION
1/2" 1/2" 5/8"
RESTRICTORS
NOTE: When the CX(E)30 is matched with a CKR30. The restrictor in the indoor unit must be changed
to 0.037".
The restrictor factory fitted to the CX(E)50 and CX(E)70 do not need changing.
INTERCONNECTING PIPEWORK
1.
Indoor and outdoor units have a low pressure charge of N
2
, which may be safely released into the
atmosphere before connection. The service valves on the outdoor unit should remain closed (IN, fully
clockwise) until pipework has been fitted, to avoid unnecessary moisture ingress.
2. Connecting the pipework
a. Remove the flare nuts from the suction and liquid service valves.
b. Ensure that the suction line is fully insulated.
c. Place the flare nuts over the incoming pipework and flare the pipe ends. The use of a little
refrigeration oil on the flaring tool will help.
d. Connect the pipework between the units. Do not leave pipe ends, valves etc. open to the
atmosphere.
R407C is very hygroscopic, and will absorb damaging levels of moisture if left open.
Always use two spanners when tightening the flare nuts to avoid twisting the pipes. Use a small
amount of refrigerant oil on the mating surfaces.
e. Sight glasses and filter driers are not necessary, but if required should be fitted between the
outdoor unit liquid shut off valve and the expansion device.
EVACUATING
1. Release the nitrogen holding charge in the indoor and outdoor units to atmosphere. Open the valves
(hex drive fully out) using a 5mm Allen key. Connect a vacuum pump to the service ports on the
outdoor unit valves and evacuate the system to 1000 microns (1 Torr) or better and allow to be held
for a minimum of 15 minutes.
2. Replace the caps on the service ports, (torque to 25NM).
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