Carrier 42GW installation manual Fresh air renewal, Winter operation diagram with fresh air intake

42 GW

Fresh air renewal and conditioned air supply to an adjacent room E N G L I S H

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

230V ~ 60Hz

TB2

L

N

TB3

5

4

3

2

1

Terminal board

Antifreeze thermostat

Speed controller

Fresh air fan motor

Relay 230V

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
-Pa	30
pressure	20
static		010/012
Available	10		016
		004
			008		020
	0				410
	0	100	200	300
					400
			Air flow m3/h

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)

GB - 15