Air Connections - CIAT COMFORT LINE Instruction Manual

4.2 Air connections

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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).
Plenums are installed using 4 screws or 6 screws (Fig.4)
- 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 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.
- Remove the knockout panel washer with the insulation by snipping off its attachment
points.
- Fasten the collar with or without controller using the 4 screws supplied.
- 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 rate, 1 shim for medium flow rate, no shims for maximum
flow rate.
- 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.
The return air grille is fitted using 11 screws (Fig.6, a)
Adjusting the height of the return air grille Remove the 4 panel screws (b).
Adjust to the desired height (max. clearance 40 mm).
Secure the 4 screws once more (Fig.6,c)
4.3 Hydraulic connections
Water always flows into the bottom of the coil and exits at the top.
The pipes are positioned in the suspended ceiling (Fig.7).
The coils are equipped (Fig.8) with a header coupling with flat face swivel nuts with
O-ring (supplied by CIAT).
mm Allen key or a flat-blade screwdriver.
The coil can be partially drained, however precautions must be
taken during winter if the installation is shut down. To drain completely, air must
be blown through the circuit.
If the hydraulic connections are completed, it is not necessary to insulate the
valves to prevent condensation (unless they are specific valves). A naturally
Fresh air
EN - 3
EN
NA 12.48 F