18
9 - VaLVe Motor and 2-Way VaLVe body
9.1 - Motor of the on/off thermo-electric valve motor
NOTE: The motor of the thermo-electric valve is supplied
in the normally closed position. This means that in order
to fill the system with water, to ensure water system
balancing and to purge the units, it is necessary to open
the valves either via wall thermostats or via the BMS.
9.1.1 - Operation
Linear movement is controlled by expansion and contrac-
tion of a wax element heated by an electrical resistor.
9.1.2 - Specifications
Power supply
230 V a.c. (± 10%) - 1 ph - 50 Hz)
Inrush current
0.7 A
Holding current
0.013 A
Power
3 W
Maximum travel
8 mm
operating temperature
0 to 50°C
degree of protection
IP43 if installed vertically
IP40 if installed horizontally
opening time
4 min.
closing time
Maximum 7 min. depending on valve motor
heating-up time (ambient temperature 20°C)
connection cable
2 x 0.75 mm
2
dimensions
Diameter 50 mm
Height 68.5 mm
Permitted differential pressure
2.5 bar (2-way valve)
9.2 - Valve motor replacement procedure
To remove the valve motor or valve body the unit must
first be removed. Disconnect the power supply to the unit
before carrying out any work on a unit.
•
Remove the 4GM unit as described in the chapter
‘Removing a 4GM unit’.
•
Lay the module on its non-removable side (fixed by
rivets).
•
Uninstall the removable side, fixed by screws.
•
Unscrew the valve motor and disconnect the cable at
the connector inside the unit after the filter (in air flow
direction) for the cold-water valve or at the controller
for the hot-water valve.
•
Remove the valve motor assembly with its cable.
•
Replace and re-install it in reverse order.
•
Re-install the 4GM unit, as described in the chapter
‘4GM installation’.
WARNING: Bleed all water from the circuit when it is
refilled.
9.3 - replacing the valve body
Disconnect the power supply to the unit before carrying
out any work on a unit. Replace the valve body, the unit
must first be removed.
•
Remove the 4GM unit as described in the chapter
‘Removing a 4GM unit’.
•
Lay the module on its non-removable side (fixed by
rivets).
•
Uninstall the removable side, fixed by screws.
•
Unscrew the valve motor.
•
Disconnect the valve body on the flexible pipe side and
on the coil side, by loosening the screw connectors.
Make sure that the coil manifold is not damaged.
- Replace the valve body.
NOTE: When connecting the new valve to the flexible
pipes and coil:
•
be careful not to damage the coil manifolds by
tightening them too much. Carrier recommends the
use of a dynamometric key, set to 15 N·m;
•
install new leak-tight joints between coil, valves and
flexible pipes.
•
make sure that the fluid flows in the direction of the
marker arrow on the valve body (if it is installed the
wrong way round the valve body will be damaged).
•
Re-tighten the valve motor screws.
•
Close the unit by re-attaching the removable side.
•
Re-install the 4GM unit, as described in the chapter
‘4GM installation’.
WARNING: Bleed all water from the circuit when it is
refilled.
All dimensions are given in mm.