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15
4.4 - Removing an ULTRA
WARNING:
Disconnect the power supply before carrying out any work
on an ULTRA.
a)
Switch off the power supply at the isolator provided for the
purpose during installation (isolator not supplied by Carrier).
b)
Disconnect the power supply cables:
Remove the two hexagon head screws (8 mm AF) securing the
ABS protective cover.
Disconnect the quick connect power supply cable from the
thermostat (7 or 8 wires) and withdraw the earth wire comple-
te 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 ULTRA T 2.6 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.
When several units are connected to a common collector, use
the piping scheme shown in the diagram below.
f) Install ceiling void air diffusers as shown in the plan 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 ULTRA. When the
unit and the false ceiling have been installed, and before start-
up, remove the protective film from the diffuser.
NOTE:
ULTRAs are connected to the diffusers by ducts. The pressu-
re 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 scrolls and the temperature sen-
sitive elements (calorstat) mounted in the air diffusers.
Check local noise level regulations and if necessary fit noise
baffles.
g) For ULTRAs with the fresh air inlet option, connect the
fresh air supply duct.
h) When installation is complete - i.e. the ULTRA is instal-
led 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 be-
tween the screw connector and the stop valve.
i) When all units are installed, open the stop valves on the
manifolds, bleed and then pressurise 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
Siphon
50 mm
Fall
20 mm/m
ICM
ICM