If Additional Refrigerant Is Required - Marstair CKC 20 1/50 Technical Manual

IF NO ADDITIONAL REFRIGERANT CHARGE IS REQUIRED:
Open the valves very slowly using a 5 or 8mm Allen key. Replace the caps on the service ports, (torque to
25NM).

IF ADDITIONAL REFRIGERANT IS REQUIRED:

1. After evacuating the indoor unit and interconnecting pipework, slowly open the valves using 5 or 8mm
Allen key. The high and low pressure should equalise within a minute.
2. Additional charge should be introduced with the system running in the air conditioning mode
(including heat pumps). See indoor unit instruction for additional system charge.
3. All units are fitted with head pressure control. The link wire across the orange terminals
allows the fan to operate at full speed. THIS SHOULD BE REMOVED AFTER CHARGING
ADDITIONAL REFRIGERANT - pipe runs over 7.5m.
4.
Add refrigerant and oil for each additional metre over 7.5m, based on the following:
Expansion line size.
Additional refrigerant (g/m).
Additional POE oil
5. If a manual HP cutout is fitted, ensure that the reset button is depressed.
6. A random start delay of up to 1 minute occurs when mains is first applied. A 3 minute delay occurs
between successive compressor operations on all systems.
7. Additional refrigerant and polyolester oil should be introduced through the Schrader valve on the
indoor unit, or the service port on the suction service valve on the outdoor unit. Ensure the
refrigerant is the correct type, as shown on the rating plate. R407C must always be added in the
liquid state.
8. Run the system for a few minutes to allow it to stabilize. Where possible, charge to a sweat line on the
evaporator. Typical suction pressures on short lines at UK conditions, with high speed evaporator fan,
high speed condenser fan, should be; electromechanical comfort system approx 4.4 bar (65 psig);
electronic comfort system approx 3.8 bar (55 psig); heat pump system approx (58 psig). Systems
should not be overcharged, to avoid liquid return to the compressor.
REFRIGERANT
FACTORY CHARGE
FOR 7.5M RUNS AT UK
CONDITIONS
CKC
15
20
30
40
50
60
80
90
100
130
150
165
180
200
3/8" 1/2"
16 30
25g per 350g of additional
refrigerant to a maximum of 300g
13
gms
660
1030
1000
1240
1690
2000
1880
2060
2520
4170
4170
4540
4640
5480
Additional polyolester oil:
5/8"
L'Unite 181-023,
48
ICI Emkarate RL32S or
RL32CF, Mobil Arctic
EAL22 or EAL22C.
55008418-01