cellarking CXE Series Technisches Handbuch - Seite 14

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CONNECTING THE UNITS

Ensure both service valves on the unit are closed (clockwise) before

commencing installation.

If a expansion assembly requires cleaning:

Remove the entire expansion assembly from the outdoor unit.

Split the expansion assembly in the middle and remove the existing

restrictor.

Drop the new restrictor vertically into the field connector.

Reassemble in the vertical plane (field connector lowest) when

reassembled the restrictor can be heard to be free to move if the

assembly is shaken.

Refit the expansion assembly.

Connecting the pipework

a. Remove the flare nuts from the suction service valve and the expansion

device as appropriate.

b. Ensure that both the suction and expansion lines are fully insulated.

c. Place the flare nuts over the incoming pipework and flare the pipe ends.

d. Connect the pipework between the units. Do not leave pipes ends, valves

etc open to the atmosphere. Always use 2 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 filters driers are not necessary, but if required should be fitted between the out

door unit liquid shut off valve and the expansion device on the MCU+ units.

MCU+ 180 has a ⅞¨ suction pipe with brazed connections. Use a protective shield to avoid

scorching the side panel.

EVACUATING

With the valves closed, connect a vacuum pump to the service ports on the outdoor unit valves. Evacuate the

interconnecting pipework and indoor unit to 1000 microns (1 Torr) or better. Allow this to be held for a minimum of 15

minutes

BRANCH LINE LENGTH

All branch lines must have the same equivalent lengths to ensure that the system is correctly balanced



The installer supplies mains, control and interconnecting cables: equipment must be earthed.



Wiring must be carried out in accordance with local and national codes.



Mains supply cables must be size compatible with the recommended fuse.



An all pole isolator switch should be positioned within easy reach of the indoor/outdoor unit dependant on

which receives the fuse supply.



Cable clamps for use with stranded cables are supplied and should be used to secure incoming/outgoing

cables. Installers must supply a method of securing solid sheathed cables.

3PH MCU+

On 3 PH MCU+ it is possible for the scroll compressor to run backwards.

This becomes obvious on start up - the compressor will not develop a normal running pressure differential and the top

will not become warm: it may be excessively noisy. If this happens, switch off the mains power and exchange the two

supply phases not connected to the indoor unit. This will correct the rotation.

ISOLATOR SWITCHES

On a 3 phase system, ensure that the neutral contact of the isolator switch is an early make, late break type. This

applies to all switches in the supply line. If in doubt, do not switch the neutral but connect it solidly.

MCU+ ELECTRICAL

55908039-02