cellarking CX - CKR Pipework; CKR Pipework Fitting Losses; CKR Suction and Liquid Lines

15/23
55908014-06
CKR PIPEWORK
MAXIMUM EQUIVALENT PIPE LENGTHS 15m
1. Performance is based on 7.5m pipe runs. Correctly sized pipes for each installation will result in no
significant loss of capacity on extended pipe runs up to 15m.
a) Pipe sizes are based on: -
Minimum of 3.8 m/s (750 fpm) suction gas velocity for horizontal or downflow.
Minimum of 7.6 m/s (1500 fpm) suction gas velocity for upflow.
Maximum of 15.2 m/s (3000 fpm) suction gas.
b) Where vertical risers exceed 3m, oil traps must be formed in the pipe. This will help ensure that oil
returns to the compressor. Typically fit an oil trap every 3m with a trap at the bottom of the riser.
2. In calculating equivalent lengths of pipe runs, the effect of bends and fittings must be taken into
account. The table below covers the fittings most likely to be encountered in this installation.
The equivalent lengths of all the fittings in a pipe run should be added together and the total added to
the actual pipe length in order to calculate the total equivalent length.
3. Use the shortest possible route, avoiding sharp bends.
4. Completely insulate the suction line, fully over the indoor unit drain tray.
FITTING LOSSES, in equivalent straight lengths of pipe (m).
Pipe Size OD
FITTING
3/8" 1/2" 5/8"
45° Bend 0.12 0.15 0.18
90° Bend R/d = 1 0.37 0.43 0.49
90° Bend R/d = 1.5 0.24 0.27 0.30
180° Bend R/d = 1.5 0.73 0.91 1.10
180° Bend C/d = 2.5 0.46 0.55 0.64
90° Elbow 0.67 0.85 1.04
To calculate the total equivalent
length, the equivalent lengths of
all fittings in a pipe run must be
added to the actual length of
pipe in the run: these are the
fittings most likely to be used.
R = Radius of bend
d = Diameter of tube
C = Centres of bend
A. SUCTION AND LIQUID LINES:
The expansion device is connected to the indoor unit and the equivalent pipe run is 15m 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" 1/2"
CHARGE
(kgs) AT
7.5m
CX(E)30 + CKR 30
- 15 - 7.5 15
- 1.32
CX(E)50 + CKR 50
- 15 - - 15
- 1.80
CX(E)70 + CKR 80
- - 15 - -
15 2.40
PIPE CONNECTIONS