Condensing Units
CU/CFCU
Condensing Units
13
Installation & Maintenance Manual : 6259626 IM V1.6.0 04/16
Refrigeration Information
REFRIGERANT PIPEWORK SCHEMATICS
CU. 1 - 12/CFCUS 5 - 10
Compressor
C
onde
n
s
er
Narrow
Tube
Service
valve
Wide
Tube
Service
valve
OUTDOOR UNIT
LP
HP
S
Optional Hot Gas
By-Pass
CUH. 1 - 12
C
om
pre
s
s
o
r
Accumulator
C
onde
n
s
er
Narrow
Tube
Service
valve
Wide
Tube
Service
valve
OUTDOOR UNIT
Cooling Mode
Expansion Valve
Check Valve
LP
HP
UNIT CHARGE
CU./CUH. 1 - 4
Units are shipped with a charge of R407C for a pipe run up to 7 metres
(equivalent length).
CUS/CUHS 5
– 12
The units are shipped with a holding charge of inert gas to guard against contamination or
moisture during shipping and storage.
The charge should be check to indicate if leaks are present prior to evacuation.
If the charge appears to be either partially or totally lost, then the unit should be carefully
checked for signs of physical damage.
PIPE SIZING GUIDE
It is important that the correct size refrigeration pipework is used to keep the system
pressure drop to a minimum and promote correct oil return.
Pipework sizes and routes should be set in accordance with good refrigeration practice.
PIPEWORK INSTALLATION
CUS/CUHS 1 - 12
The suction line should be insulated.
Liquid lines should be insulated in areas of high temperature or when exposed to
direct sunlight.