Removing An Icm - Carrier 42BJ ICM Installation Manual

When several units are connected to a common collector, use
the piping scheme shown in the diagram below.
ICM
f) Instal ceiling void air diffusers as shown in the drawing for
the room that is to be air conditioned.
Connect the supply and return air duct to the corresponding
collars on both the diffuser plenum and the ICM. When the
unit and the false ceiling have been installed, and before start-
up, remove the protective film from the diffuser.
NOTE:
ICMs are connected to the diffusers by ducts. The pressure
drop in the ducts must be compatible with the capacity of the
unit. The inner surfaces of the duct must be as smooth as
possible. Avoid sharp bends.
Check that there are no leaks or kinks, and that there is no
dirt or installation debris inside the ducts. Debris within the
ducts might damage the fan wheel and the damper in the air
diffusers.
Check local noise level regulations and if necessary, add
sound attenuator.
g) For ICMs with the fresh air inlet option, connect the fresh
air supply duct.
h) When installation is complete - i.e. the ICM is installed in
the false ceiling or floor void, air ducts are complete, water
manifolds are in position with stop valves ready on the
connection stubs, and electrical installation is prepared - then
connect the flexible water pipes (see "Flexible water pipes" in
a later section).
Every flexible pipe has a 1/2" gas screw connector.
Ensure that a gasket (not supplied by Carrier) is installed
between the screw connector and the stop valve.
i) When all units are installed, open the stop valves on the
manifolds, bleed and then pressurize the circuits. To bleed the
coils, remove the plastic plugs on the coil access door and then
slightly undo the bleed screws with a screwdriver. Close the
valve firmly when all air has escaped.
j) Make the electrical connections.
Do not switch on the power until all connections are made and
secured and all protective covers are in place. The installation
can then be started.
Fall 20 mm/m
ICM
Fall 20 mm/m

4.4 - Removing an ICM

WARNING:
Disconnect the power supply before carrying out any work
on an ICM.
a) Switch off the power supply at the isolator provided for the
purpose during installation (isolator not supplied by Carrier).
Siphon 50 mm
b) Disconnect the power supply cables:
• Maestro Zone Controller
Disconnect the power supply cable and the earth wire fitted
with a flat tag. Disconnect the quick connect coupler linking
the Zone User Interface (ZUI) to the ICM. Where appropriate
disconnect the quick connect cable for the BMS bus.
Disconnect the quick connect coupler for the window contact.
• Electromechanical controller with speed controller and wall-
mounted thermostat
Remove the two hexagon head screws (8 mm AF) securing the
ABS protective cover.
Disconnect the quick connect power supply cable from the
thermostat (8 wires) and withdraw the earth wire complete
with its flat tag.
c) Close the isolating valves on the manifolds.
d) Disconnect the flexible water pipes by unscrewing the 1/2"
gas connectors.
WARNING:
Since the flexible water pipes do not have drain valves, a
receiver must be provided to allow the cooling coil to be
drained. The coil water capacity of the ICM size 2.3 is 1.2
litres.
e) Disconnect the supply air and return air ducts and the fresh
air duct if fitted.
f) Disconnect the flexible condensate drain pipe. Drain the
siphon into a suitable vessel.
g) Support the unit and release it gently by unscrewing the
four nuts on the screwed hangers. Lower the unit carefully.
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