Pipe Sizes; Connecting The Units - Marstair CKC 20 1/50 Technical Manual

PIPE SIZES

UNIT
SIZE
15 7.5
20 7.5
30
40
50
60
80
90
100
130
150
165
180
200
RESTRICTORS
Outdoor units (cool only) have optional kit expansion assemblies with cooling restrictors fitted.
CKC 15 20
Restrictor 0.033 0.033

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.
3. Connecting the pipework:
a. Remove the flare nuts from the suction service valve and the expansion
device as appropriate.
b. Ensure that both the suction and expansion lines are fully insulated.
c. Place the flare nuts over the incoming pipework and flare the pipe ends.
d. Connect the pipework between the units. Do not leave pipes ends, valves etc open to the
atmosphere. Always use 2 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 filters driers are not necessary, but if required should be fitted between the
outoor unit liquid shut off valve and the expansion device on the CKC units.
CKC 180 & 200 have a ⅞¨ suction pipe with brazed connections. Use a protective shield to avoid
f.
scorching the side panel.
EVACUATING
With the valves closed, connect a vacuum pump to the service ports on the outdoor unit valves. Evacuate
the interconnecting pipework and indoor unit to 1000 microns (1 Torr) or better. Allow this to be held for a
minimum of 15 minutes.
MAXIMUM LENGTH OF EQUIVALENT
SUCTION LINE PIPE SIZES (m)
⅜ ⅝
½ ¾
30 50
23 50
15 50 80
10 36 80
7.5 18 50
14 36
11 30
10 25
7.5 22
15
12
8
7.5
30 40 45
0.040 0.044 0.046
⅞ 1⅛ 1⅜
80
80
80
55 80
45 80
30 80
27 80
18 60 80
16 55 80
15 50 80
50 60 80 90
0.050 0.052 0.057 0.063
11
EXPANSION LINES
⅜ ⅝
½
50
50
50 80
7.5 80
7.5 50 80
7.5 50 80
50 80
20 80
15 80
12 60
8 50
7.5 40
7.5 35
7.5 30
100 130 150
0.068 0.071 0.080
RESTRICTOR
¾
80
80
80
80
80
165 180 200
0.082 N/A
REFRIGERANT F
55008418-01