CIAT COMFORT LINE, Instruction Manual

Page: 20 / 32

4 - NSTALLATION AND CONNECTIONS
To prevent injury or damage to the unit or room, work must only be carried out by qualified
personnel.
4.1 - Mechanical connections
Ensure that the suspended ceiling panels can be
easily removed and that there is enough space to
carry out maintenance and servicing operations.
The COMFORT LINE TM must be suspended from the
ceiling using 4 or 6 threaded rods either 6 mm or 8 mm
in diameter (not supplied), which are fixed to the unit's
4 or 6 oblong holes using anti-vibration resilient mounts
(optional, fig.3, a) or a nut/washer assembly positioned
on either side of the mounting bracket (fig.3, b).
Note: CIAT strongly recommends the use of anti-
vibration resilient mounts when securing the unit,
in order to reduce the transmission of vibrations
through the building structure during operation.
For LI, LIk, LY and LYk models, the unit should ideally
be positioned inside the suspended ceiling in the
entrance corridor of rooms, with the supply air opposite
the window. The unit must never be placed in the centre
of the room.
■ The unit must be perfectly level in
relation to the suspended ceiling to
prevent condensate draining problems
(see procedure for removing the
condensate pan on page 10.)
■
If a room thermostat is fitted, place it on
an inside wall (not behind a door) and at
a height of 1,50 m from the floor. Keep it
away from sunlight and all sources of
heat.
4.2 - Air connections
4.2.1 - Air quality
Comfort units are not designed to control the humidity
of outside air. Fresh air handling must be provided by
an independent system in accordance with accepted
engineering practice (see CIAT air handling unit ranges).
All collars must be connected, whatever
the model. None must be capped, either for
the supply or return air.
4.2.2 - Fresh air knockout
If the fresh air return leads directly outside, the duct must
not exceed 5 metres in length. The fresh air temperature
must not be below -10 °C. A rain guard grille and a filter
must be fitted (at the installer's expense) to prevent water
or other material entering the duct from outside. If an
auxiliary fan is being used (supplied by the installer), the
flow of fresh air must be limited to 10% of the unit's
nominal flow rate to prevent noise, coil frosting or air
filter bypass problems.
4.2.3 - Adjusting the fresh air collars
(Fig.4):
Either remove or leave on the shims needed to obtain
the desired flow rate. The flow rate ranges are given on
the label on the casing. 2 shims for minimum flow, 1 shim
for medium flow, no shims for maximum flow.
The pressure difference must be between 50 and 100
Pa in order to obtain the desired flow rate.
Maintain the controller in the "BAS" (down) position.
4.2.4 - Fitting and adjusting the return air
grille for assembly versions LI/LY (Fig.5).
The return air grille is fitted using 11 screws (a).
To adjust the height of the grille, remove the 4 panel
screws (b) and adjust to the required height (max.
clearance 40 mm). Secure the 4 screws once more (c).
4.3 - Hydraulic connections
Water always flows into the bottom of the coil and exits
at the top.
For size 0, the pipes are positioned in the suspended
ceiling as shown in Fig. 6, a. For sizes 1 to 6, the pipes
are positioned in the suspended ceiling or raised floor
as shown in Fig. 6, b.
The coils are equipped (fig.7) with a header coupling
with flat face swivel nuts with a female thread, diameter
G ½˝ or G ¾˝ depending on the size of the unit, and an
O-ring (supplied by CIAT ).
The header coupling is equipped with an air bleed valve
(fig. 8, a) at the high point with partial draining at the low
points (fig. 8, b) that can be manoeuvred using a 7 mm
Allen key or a flat-blade screwdriver.
COMFORT LINE TM EN-20