Carrier 42GWC004-3 Installation Manual page 16

42 GW
Fresh air renewal and conditioned air supply to an adjacent room
Fresh air renewal
• The optional supplementary fan for fresh air intake (field
supplied) has to be connected to terminal block as per
diagrams enclosed.
Fan motor operation is parallel to the thermo-electric control
valve, and the motor stops when the valve shuts off.
• For winter operation with fresh air intake, an anti-freeze
thermostat set at 2°C is recommended, with the bulb placed
on the water outlet pipe, before the supplementary fan.
• The fresh air flow must be less than 10% of the total air flow,
to avoid operating problems or eccessive noise.
For higher air flow a "primary air kit" is available which uses
the prepunched hole for air ducting to an adjacent room and a
baffle so that the fresh air is introduced into the room through
a diffuser.
• Install an air inlet grille with filter inspection port to prevent
dust and dirt from entering and fouling the unit heat
exchanger.
Filter installation also makes the installation of a duct closing
damper during shut-down periods unnecessary.
Winter operation diagram with
fresh air intake
TB2
L
N
TB3
5
4
3
2
1
Terminal board
Antifreeze thermostat
Speed controller
Fresh air fan motor
Relay 230V
230V ~ 60Hz
Conditioned air supply to an adjacent room
• Air supply to an adjacent room requires that the outlet
corresponding with the duct is closed, using the air
supply outlet obstruction kit supplied.
The kit cannot be used in units equipped with electric
heater (mod. 42GWE).
An air inlet grille must be fitted (if possible near the floor)
between the air conditioned room (where the unit is situated)
and the adjacent room or, alternatively, the door must be
undercut, as shown in the drawing.
• The duct lengths can be calculated in accordance with the "air
distribution to an adjacent room" diagram, also taking into
account the pressure drop through air diffusers and fresh air
filters.
• DO NOT use active carbon or electrostatic filter kits for
ducts towards adjacent rooms.
Diagram of conditioned air supply to an
adjacent room: one louvre closed
40
30
20
010/012
10
004
008
0
0 100
Supply air duct to adjacent room
In case of two louvres closed, the fresh air flow towards the
adjacent room is 50% higher compared with only one louvre
closed (with equal static external pressure)
E N G L I S H
020
016
200 300 400
3
Air flow m /h
GB - 15
410