6/8
56408015-02
For systems with interconnecting pipework in excess of 7.5 metre add 20gms per metre on
CKA 35 & CKA 50, add 30gms per metre on CKA 70. No additional oil is required.
PIPE CONNECTIONS
Units are supplied with the following male flare connections (sizes in inches):
INTERCONNECTING PIPEWORK
1.
The Indoor unit has 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, and system evacuated.
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: if an expansion line is used this should also be 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.
R410A 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 (DO NOT RELEASE THE OUTDOOR UNIT SERVICE VALVES) UNTIL THE SYTEM IS
EVACUATED.
1.
Release the nitrogen holding charge in the indoor unit to atmosphere. 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).
ADDING REFRIGERANT
1.
A 3-minute delay occurs between successive compressor operations.
2.
R410A should be introduced through the Schrader valve on the indoor unit, or the service port on the
suction service valve on the outdoor unit.
No other refrigerant must be used.
NOTE: LABEL R410A POE (supplied loose) TO BE FIXED ABOVE SERVICE VALVES.
3.
Run the system for a few minutes to allow it to stabilize. Where possible, charge to a sweat line on the
evaporator. Typical suction pressure on short lines at UK conditions should be approx.
6.2bar
(90 psig)
INTERCONNECTING PIPEWORK (Max 15 metres)
Torque (NM)
Nut A/F (mm)
System
Liquid/
Expansion
Suction
Liquid
Line
Suction
Line
Liquid
Line
Suction
Line
CX(E)A 30 + CKA35
1/4"
1/2"
17
54
17
24
CX(E)A 50 + CKA35
1/4"
1/2"
17
54
17
24
CX(E)A 50 + CKA50
1/4"
1/2"
17
54
17
24
CX(E)A 70 + CKA70
3/8”
5/8”
34
73
22
27
CKA REFRIGERANT
