Carrier 42GW B Serie Manual De Instalación página 28

Motorized valve and control
Motorized thermo-electric valve assembly and components
(See fi g. 28).
Mod. 42GW...B
Ref. Description
b Self tapping screw
c Clip
Valve 1"gas pre-assembled
d Valve 3/4" gas pre-assembled
Valve 1/2" gas pre-assembled
e Auxiliary drain pan
f Insulating material
g Cable holder
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 fi gures, 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 fi rst (See fi g. 30).
Gently grease the O-rings before fi tting them into their seats.
• Connect the valve assemble to the coil and fi x 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 fi x 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 fi x 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 fi lled
with water, check all fi tting seals.
NOTE:
The seal effi ciency of the valve assembly is factory tested. Any
system losses are therefore due to an incorrect installation.
Operation of the thermo-electric valve (See fi g. 31)
• This 2- 3-way valve is of the OPEN/CLOSE type with very slow travel.
It is not a modulating valve so it has no PTC.This valve is driven, as a
26 42 GW...B
004 012 004 020
008 016 008
010 020 010
2-pipe 4-pipe
q.ty q.ty q.ty q.ty
3 3 3 3
3 3 3 3
1 1
1 1 1
1
1 1 1 1
1 1 1 1
1 1 1 1
See fi g. 29).
sensible element, by the ambient thermostat of the "cassette" unit.
• The 2-way valve is normally closed to the coil with no powered
actuator side. The 3-way valve is normally closed to the coil with no
powered actuator side while is open to the bypass way side. When
the room temperature does not satisfy the thermostat, an electric
heater activates the heating of a thermostatic element which causes
the down-stroke of the piston; the valve opens after about 3 minutes
about to allow water to circulate in the coil.
• If the room temperature satisfi es the thermostat or if the electric
power has been switched off , the valve is closed after about 3 minutes
towards the coil and is opened towards the bypass.
• If an emergency occurs, the valve may be manually opened, removing
the electric head, unscrewing the ring nut.
When the emergency ends, remember to reset the valve to
automatic operation, repositioning the electric head; failure to
do this can result in condensate formation due the water pipes,
even if the unit is switched off .
Instructions for fi eld supplied valves
Water connection
• Install valves following manufacturer's instructions; refer to the
relevant fi gures for connection to the unit.
• Carefully insulate pipes, valve assemblies and coil connections (cold
water side) to avoid condensation forming on the pipes and dripping
on the false ceiling.
Electrical wiring
• Connect the room control following instructions for the control used.
WARNING:
Pass cables through the control panel cable-conduit.
• Connect the valves according to the instructions and the wiring
diagrams attached to the machine documents.
• Valves, closing the unit water inlet when there is no power
supply, must be used.
ON-OFF valves (230V)
• The chilled water valve must be operated by the 230V on-off signal
from terminal 1 of TB3 and the hot water valve from terminal 2 of TB3.
• If these connections are not made as described the drain pan
condensate may overfl ow.
• Valves should open only when the fan is working, that is, when one of
terminals V1, V2, V3 is energized by L mains supply.
• The optional electric heater (mod. 42GWE) which can only be factory
installed, must only be energized when the fan is working.
• The electric heater (if any) is operated only if a 230 V voltage is
supplied to terminals 2 and 4 of the electronic board.
• NOTE: When the system is fi lled with water, verify all couplings
for tightness.
• The manufacturer does not accept responsibility for the tightness
of the fi eld - installed valve assembly and this is not tested in the
factory.
• He declines any responsibility for non functioning of these
assemblies and for damage due to dripping.