Operating instructions

10/14
55908022-02
NOTE
When the CXE 40 is matched with a CKC 20.
The restrictor in the indoor unit must be
changed to 0.033"
When the CXE 50 is matched with a CKC 40.
The restrictor in the indoor unit must be
changed to 0.051"
When the CXE 70 is matched with a CKC 60.
The restrictor in the indoor unit must be
changed to 0.057"
A. USING SUCTION AND LIQUID LINES:
With the expansion device connected to the indoor unit, the equivalent pipe run should be 20m maximum,
including a maximum lift of 7.5m. Fully insulate the suction line. Ensure the suction pipe is insulated well over
the drain tray at the indoor unit. Liquid lines should be routed to avoid hot areas. This prevents flash gas
forming, which may result in erratic control of liquid refrigerant to the evaporator.
MAXIMUM EQUIVALENT LENGTH OF SUCTION LINE PIPE SIZES (m) LIQUID LINE
SYSTEM
3/8" 1/2" 5/8" - 1/4" 3/8"
CXE40 + CKC20
7.5 20 - - 20 --
CXE50 + CKC40
- 15 20 - - 20
CXE70 + CKC60
- 7.5 18 20 - 20
B. USING SUCTION AND EXPANSION LINES
The expansion assembly must be removed from the indoor unit and connected to the outdoor unit allowing a
pipe run of up to 80m, including a maximum lift of 20m (CKC20 maximum 50m with 7.5m lift).
CXE units only, remove the right hand panel cover plate from the indoor unit and remove the expansion
assembly. [Make good the gap using Extended Pipe Run Kit 55900709 (30,40,50), 55900710 (70).]
Fit the expansion assembly onto the outdoor unit liquid line service valve. Fully insulate both the suction and
expansion lines, including the expansion device: ensure the pipes are insulated well over the drain tray at the
indoor unit.
MAXIMUM EQUIVALENT LENGTH OF SUCTION LINE PIPE
SIZES (m)
EXPANSION LINES
SYSTEM
3/8" 1/2" 5/8"
3/4" 7/8”
3/8" 1/2" 5/8"
CHARGE
(kgs) AT
7.5m
CXE40 + CKC20
7.5 23 50 - - 50 - - 0.93
CXE50 + CKC40
- 10 36 80 - 7.5 80 - 1.30
CXE70 + CKC60
- 7.5 18 50 80 7.5 50 80 1.90
PIPE CONNECTIONS
Units are supplied with the following male flare
connections (sizes in inches):
(** Use reducing nut provided)
RESTRICTORS
Indoor units are supplied with restrictors fitted.
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: if an expansion line is used this should also be fully
insulated.
OUTDOOR UNIT CKC20 CKC40 CKC60**
LIQUID / EXPANSION 3/8" 3/8" 3/8"
SUCTION 1/2" 1/2" 5/8"