18/23
55908014-06
CKR REFRIGERANT
Electrics box
Head pressure
adjustment screw
Fan capacitor
ADDING REFRIGERANT
1. The unit is fitted with head pressure control; before charging, isolate the outdoor unit and transfer the
motor wire on the head pressure control from terminal 4 to terminal 1.
(Don't forget to transfer it back after charging).
2. If a manual HP cutout is fitted, ensure that the reset button is depressed.
3. A 3 minute delay occurs between successive compressor operations.
4. R407C should be introduced through the Schrader valve on the indoor unit, or the service port on the
suction service valve on the outdoor unit. No other refrigerant must be used.
NOTE: LABEL R407C POE (supplied loose) TO BE FIXED ABOVE SERVICE VALVES.
SYSTEM LIQUID LINE (m)
5 10 15
No extra POE oil needed with liquid lines.
Charges shown are for guidance: actual charge will
depend on the individual application. It is recommended
that you charge to a sweat line on the outlet of the
evaporator and/or a full sight glass if fitted
CX(E) 30 + CKR 30 1.17 1.47 1.77
LIQUID LINE
CX(E) 50 + CKR 50 1.65 1.95 2.25
1/4" 3/8"
CX(E) 70 + CKR 80 2.25 2.55 2.85
Additional charge based on:
25 g/m 60 g/m
5. Run the system for a few minutes to allow it to stabilize. Where possible, charge to a sweat line on the
evaporator. Typical suction pressure on short lines at UK conditions should be approx. 3.8bar (55
psig).
6. Transfer the motor wire back from terminal 1 to 4 on the HPC pcb.
7. Head pressure controller
The HPC is factory set to suit R407C refrigerant. It may be necessary to adjust this to suit site
conditions, to raise or lower the nominal head pressure.
I. With the system switched off, connect a high pressure gauge to the liquid line service valve.
II. Switch on the system and run for a few minutes to stabilise.
III. The head pressure should be approximately 275-280 psig (18.9-19.6 barg). To achieve this
adjust the screw clockwise to increase the pressure by approx 5 psig (0.5barg)
NOTE: Min fan speed (0 rpm) and fan cut in pressure (230psig / 15.6 barg) are factory set and not
adjustable.
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