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6/8 

56408015-02 

For systems with interconnecting pipework in excess of 7.5 metre add 20gms per metre on 
CKA 35 & CKA 50, add 30gms per metre on CKA 70. No additional oil is required. 

 
PIPE CONNECTIONS

 

Units are supplied with the following male flare connections (sizes in inches): 

 

 

 
 
INTERCONNECTING PIPEWORK 

 

1.

   

The Indoor unit has a low pressure charge of N

2

, which may be safely released into the atmosphere 

before connection. The service valves on the outdoor unit should remain closed (IN, fully clockwise) 
until pipework has been fitted, and system evacuated. 
 

2. 

     Connecting the pipework 

a.

  Remove the flare nuts from the suction and liquid service valves. 

b.

  Ensure that the suction line is fully insulated: if an expansion line is used this should also be fully 

insulated.

 

c.

  Place the flare nuts over the incoming pipework and flare the pipe ends. The use of a little 

refrigeration oil on the flaring tool will help. 

  

d.

  Connect the pipework between the units. Do not leave pipe ends, valves etc. open to the 

atmosphere. 
R410A is very hygroscopic, and will absorb damaging levels of moisture if left open. 
Always use two spanners when tightening the flare nuts to avoid twisting the pipes. Use a small 
amount of refrigerant oil on the mating surfaces. 

  

e.

  Sight glasses and filter driers are not necessary, but if required should be fitted between the 

outdoor unit liquid shut off valve and the expansion device. 

 

 

 

EVACUATING (DO NOT RELEASE THE OUTDOOR UNIT SERVICE VALVES) UNTIL THE SYTEM IS 
EVACUATED.

 

 

1.

   

Release the nitrogen holding charge in the indoor unit to atmosphere. Connect a vacuum pump to the 
service ports on the outdoor unit valves and evacuate the system to 1000 microns (1 Torr) or better 
and allow to be held for a minimum of 15 minutes. 

 

2.

   

Replace the caps on the service ports, (torque to 25NM).

 

 
 
ADDING REFRIGERANT

 

 

1. 

A 3-minute delay occurs between successive compressor operations. 

 
 

2. 

R410A 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 R410A POE (supplied loose) TO BE FIXED ABOVE SERVICE VALVES. 
 
 
3. 

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. 

6.2bar 

 

          (90 psig)

 

 
 

INTERCONNECTING PIPEWORK (Max 15 metres) 

 

 

Torque (NM) 

Nut A/F (mm) 

System 

Liquid/ 

Expansion 

Suction 

Liquid  

Line 

Suction  

Line 

Liquid 

Line 

Suction 

Line 

CX(E)A 30 + CKA35 

1/4" 

1/2" 

17 

54 

17 

24 

CX(E)A 50 + CKA35 

1/4" 

1/2" 

17 

54 

17 

24 

CX(E)A 50 + CKA50 

1/4" 

1/2" 

17 

54 

17 

24 

CX(E)A 70 + CKA70 

3/8” 

5/8” 

34 

73 

22 

27 

CKA REFRIGERANT 

Summary of Contents for Marstair 56500002

Page 1: ...Safe Working practices 2 These units contain live electrical components moving parts and refrigerant under pressure Always site out of reach of children and protect from vandalism 3 The data plate on...

Page 2: ...17 5 17 5 39 39 124 422 5 70 845 888 124 888 Fixing centres Fixing centres 320 96 MIN 500 FOR SIDE ACCESS 483 20 X Interconnecting Wiring Z1 Suction Z2 Liquid Expansion SIDE VIEW Wall mounted X Z1 Z2...

Page 3: ...50 CKA 70 A 760 760 860 B 256 256 307 C 552 552 660 D 330 330 370 E 290 290 340 F 510 510 630 G 50 50 50 H 85 85 85 J 70 70 70 WEIGHT 35Kg 42Kg 56Kg Valve Size LIQUID upper 1 4 1 4 3 8 Valve Size SUC...

Page 4: ...uring that it is square and level 6 Remove the drain tray then fit the drain stub nut gasket Refit the drain tray NITROGEN CHARGE The unit contains a small charge of dry nitrogen which should be disch...

Page 5: ...ipe Size OD To calculate the total equivalent length the equivalent lengths of all fittings in a pipe run must be added to the actual length of pipe in the run these are the fittings most likely to be...

Page 6: ...mating surfaces e Sight glasses and filter driers are not necessary but if required should be fitted between the outdoor unit liquid shut off valve and the expansion device EVACUATING DO NOT RELEASE...

Page 7: ...ee page 2 Cables MUST be size compatible with the recommended system fuse FUSES SYSTEM COOL ONLY WITH ELECTRIC HEATER 1PH 3PH 1PH 3PH CX E A30 CKA35 16A 16A CX E A50 CKA35 20A 20A CX E A50 CKA50 20A 2...

Page 8: ...5 2 83 2 15 3 25 3 0 CX E A 50 CKA 50 3 50 2 45 3 25 3 0 CX E A 70 CKA 70 4 62 3 24 3 25 3 0 OPTIONAL KITS PART NUMBER DESCRIPTION 55900700 3kW heater CXA only 55900701 Digital temperature display CXA...

Page 9: ...dd 1dBA or 1NC for high level wall mounted units TEMPERATURE CONTROL Do not set the controller below 8 C The SET temperature is factory set at 12 C The digital display normally displays the return air...

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