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54208003-13
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Outdoor units are supplied with the following male flare connections (in inches) :-
NOTE: Ensure both service valves on the outdoor unit are closed (IN, fully clockwise) before commencing
installation.
Indoor units have a low pressure holding charge of nitrogen, which may be released into the atmosphere without
damage to the environment. This should be done prior to making pipework connections.
RESTRICTORS
Outdoor units (cool only & heat pumps) are supplied with expansion assemblies and cooling restrictors fitted.
DCU+
10
15
20
30
40
50
60
80
Restrictor
0.027
0.032
0.035
0.037
0.042
0.046
0.050
0.058
HEAT PUMP HEATING
All heat pump units have an additional expansion assembly supplied loose inside the unit. This is to be fitted
to some indoor units for heating. Fit the assembly within 10m of the indoor unit in the expansion line.
Note:
the refrigerant flow is from indoor to outdoor, opposite to cooling assembly. Placing it directly at the
indoor coil may cause increased noise during the heating cycle. No separate check valve is needed. The
expansion assembly and line must be fully insulated.
Note:
The indoor units listed below are fitted with heating capillarys.
WM60H, WM80H, WM100H, CC875/80H, CC875/110H, CC875/140H, HL380, HL460, HL540
The additional heating expansion assembly (supplied loose in the heat pump unit) is not required.
Retain as a spare.
DHPUL
15
20
30
40
50
60
Restrictor Cooling
0.032
0.037
0.039
0.043
0.049
0.052
Restrictor Heating
0.027
0.036
0.037
0.042
0.044
0.053
CONNECTING THE UNITS
1.
Ensure both service valves on the unit are closed (clockwise) before
commencing installation.
2.
If a expansion assembly requires cleaning:
a. Remove the entire expansion assembly from the outdoor unit.
b. Split the expansion assembly in the middle and remove the existing
restrictor.
c.
Drop the new restrictor vertically into the field connector.
d. Reassemble in the vertical plane (field connector lowest) when
reassembled the restrictor can be heard to be free to move if the
assembly is shaken.
e. Refit the expansion assembly.
RESTRICTOR
REFRIGERANT FLOW
MODEL
DCU+
15
30
40
60
80
EXPANSION
3/8
3/8
3/8
3/8
1/2
SUCTION
3/8
1/2
1/2
5/8
5/8
MODEL
DHPUL
15
30
50
80
EXPANSION
3/8
3/8
3/8
1/2
SUCTION
3/8
1/2
5/8
5/8
PIPE CONNECTIONS / RESTRICTORS