Condensing Units
CU/CFCU
Condensing Units
21
Installation & Maintenance Manual : 6259626 IM V1.6.0 04/16
Commissioning
REFRIGERANT
CHARGING
The following information is based on a complete Airedale matched system and indicates
the approximate amount of refrigerant charge required. It is also assumed that the system
has been designed within operating parameters and to good refrigeration practice.
NOTE: It is important that the system is charged with the correct amount of
refrigerant. Remember, a seriously over or undercharged system may lead to major
component failure.
The final refrigerant charge level should be set by the design evaporating and condensing
pressures, together with a full or nearly full sight glass.
The suction and discharge pressures should be constantly monitored whilst charging is
in progress.
NOTE:- The sight glass level must be checked in the COOLING MODE ONLY.
ADDING REFRIGERANT
CU./CUH. 1
– 4
Supplied pre-charged for up to 7m pipe runs (equivalent length), please refer to the table
below for additional charging guidance.
CUS/CUHS 5
– 12 &
CFCUS 5
– 10
Supplied with a holding charge, the charge in the Technical Data tables is based on
approximately 30m pipe runs (equivalent length).
The following approximate amounts should be added to the system for every additional
metre of pipe run above the standard charge:
System
Additional Grams Per Metre Pipe Run
CU/CUH 1
– 1.5
24g
CUS/CUHS 2
28g
CUS/CUHS 2.5
– 3.5
67g
CUS/CUHS. 4
119g
CUS/CUHS & CFCUS 5
125g
CUS/CUHS & CFCUS 6
– 7.5
210g
CUS/CUHS & CFCU 10
384g
CUS/CUHS 12
384g
ADDING OIL
CU/CUH 1
– 1.5
The initial oil charge in the compressor is suitable for pipe runs up to 20m
(equivalent length).
CUS/CUHS 2
– 12 &
CFCUS 5
– 10
The initial oil charge in the compressor is suitable for pipe runs up to 30m
(equivalent length).
For longer pipe runs add 26 g of oil for every ADDITIONAL 0.45 kg of refrigerant added
up to the maximum permissible equivalent pipe runs stated. Please consult Airedale for
further details.
