Operating instructions
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55908022-02
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 cut-out 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.
CHARGE (g)
LIQUID LINE (m)
SYSTEM
5
10
15
20
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.
CXE 40 + CKC 20
780 1080 1380 1680
CXE 50 + CKC 40
1150 1450 1750 2050
Liquid line
Expansion line
R407C
CXE 70 + CKC 60
1750 2050 2350 2650
1/4"
3/8"
3/8"
1/2"
5/8"
Additional
charge
based
on:-
25 g/m
60 g/m
16 g/m
30 g/m
48 g/m
EXPANSION LINE (m)
SYSTEM
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
CXE 40 + CKC 20
890 970 1050 1130 1280 1430 1580 1730 1880 2030 - - - - - -
CXE 50 + CKC 40
1260 1340 1490 1640 1790 1940 2090 2330 2570 2810 2960 3110 3260 3410 3560 3710
R407C
CXE 70 + CKC 60
1860 1940 2090 2240 2390 2540 2690 2840 2990 3140 3380 3620 3860 4100 4340 4580
CXE 40 + CKC 30
- - - - 25 25 25 50 50 50 - - - - - -
CXE 50 + CKC 50
- - - - 50 50 50 50 100 100 100 100 100 150 150 150
POE
OIL
(EXP.
LINE)
CXE 70 + CKC 80
- - - - 50 50 100 100 100 150 150 150 200 200 200 250
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, indoor fan set to high speed 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.
☺
☺
4
4
4
4
HPC
1234
BLUE MOTOR WIRE
CKC REFRIGERANT