Carrier 42GW installation manual Motorized valve and control, Mod GW

42 GW

Motorized valve and control

E N G L I S H

•The unit control circuit only allows opening of the motorized valve when the fan motor is working.

(See wiring diagrams)

•When the thermostat asks for cooling, terminal 1 of TB3 (cold water) is supplied with 230V.

When it asks for heating, terminal 2 of TB3 (hot water or electric heater) is supplied with 230V.

•The control circuit ensures that the condensate discharge pump works continuously while the thermostat, asking for cooling, keeps the cold water regulating valve open.

WARNING :

The valve is not only necessary to control the room temperature, but also to stop the cold water flow to the coil in case of an abnormal condensing water level rise in the drain pan.

•If there is an abnormal condensing water rise in the drain pan (for example: possible defective drain, pump malfunction, fan motor not working) causing the opening of the float switch contact (FS), the control circuit either operates the c ondensate drain pump, or at the same time closes the regulating valve, stopping the cold water flow towards the coil and avoiding further condensation.

Control

The water flow has to be controlled:

•by installing the motorized thermo-electric valves supplied

as accessory or

•by installing motorized field supplied valves.

Motorized thermo-electric valve assembly and components

A B CD

	F				D1
	G
	E
		Water inlet	Water outlet
	Mod. 42GW	004	012	004	020
		008	016	010
		010	020
		2-pipe		4-pipe
Ref. Description		q.ty	q.ty	q.ty	q.ty
A	Adaptor 3/4 " gas with O-ring		2
	Adaptor 1" gas with O-ring +				2+
	Adaptor 3/4" gas with O-ring +				2
B	Self tapping screw	3	3	3	3
C	Clip	3	3	3	3
D	Valve 1" gas pre-assembled		1
	Valve 1" gas pre-assembled +				1+
	Valve 3/4" gas pre-assembled				1
D1	Valve 3/4" gas pre-assembled	1
	Valve 3/4" gas pre-assembled			1+
	Valve 1/2" gas pre-assembled			1
E	Auxiliary drain pan	1	1	1	1
F	Insulating material	1	1	1	1
G	Cable holder	1	1	1	1

Instructions for mounting of motorized thermo-electric valve assembly

(see "Components" table)

•The thermo-electric valve must be mounted on the unit after the unit installation.

For this operation follow figures, depending on model.

•Insert the clips supplied in the unit side slots.

Assembly

For models 42GWD (4-pipe), the valve assembly for the cold water coil must be installed first.

•Gently grease the O-rings before fitting them into their seats.

Sizes 004 - 008 - 010

Ring nut

O-ring

Coil coupling

See diagram supplied with the kit..

Sizes 012 - 016 - 020

Adaptor

O-ring

Coil coupling

Fit the reducers and O-rings towards the coil connection.

•Connect the valve assemble to the coil and fix it by a 30Nm torque.

•Insulate the valve assembly.

•For 4-pipe hot water coil, repeat all the operations with gas adaptors, as per the table.

•Pass cables through the cable holder G and fix them to the case using the already pre-assembled screws.

•Mount the drain pan below the valve assembly, inserting the discharge pipe into the special hole; align and fix it to the 3 clips previously assembled using the three screws supplied.

•Insulate the 3 screws and the drain pan lower part using the insulating material F.

•To connect the steel pipes to the system, ensure they are aligned and supported to avoid excess strain on the unit. If the system is filled with water, check all fitting seals.

NOTE:

The seal efficiency of the valve assembly is factory tested. Any system losses are therefore due to an incorrect installation.

Electric connections

•To connect valves to the electric panel pass cables through the electric panel grommet and connect them to the terminal board TB3 as per the wiring diagrams.

GB - 9