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3. Manual Opener
The manual opener (Fig. 6) can be manipulated only
when in the up position. This must be done without
electrical hook-up. The motorized valve can be
opened by firmly pushing the white manual lever down
to midway and in. This holds the valve in the open posi-
tion, and with auxiliary switch models the N.O. switch
is closed.
This "manual open" position may be used for filling,
venting, or draining the system, or for opening the
valve in case of power failure.The valve can be
restored manually to the closed position (stem up) by
depressing the white manual lever lightly and then
pulling the lever out. The valve and actuator will return
to the automatic position when power is restored.
Note: If the valve is powered open, it cannot be
manually closed
4. Installation
4.1 General notes
The following instructions refer to the version of VC
valve with BSPP thread. Other versions are available
on request. Refer to the boiler manufacturer's manual
for installation instructions and model number
WARNING:
The products are intended to be installed
by a trained, experienced service-person
and according to the RATINGS given in
the Instructions and on the product.
4.2 Before installing this product
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazar-
dous condition
2. Check and make sure the ratings of this product are
suitable for your application
3. Check the controller for SPDT or SPST output to
make sure it matches the valve actuator selected.
4. Always conduct a thorough checkout when installa-
tion is completed
5. Disconnect power supply before connecting wiring
to prevent electrical shock and equipment damage
MU1H-2805GE23 R0107
GB
4.3 Plumbing
1. While not necessary to remove the actuator from the
body, it can be removed for ease of installation.
2. You don't need any tool to remove the actuator. The
actuator head is automatically latched to the valve.
To remove, (Fig. 4) press up on the latch mecha-
nism (1) located directly below the white manual
open lever with thumb. Simultaneously press the
actuator down towards the body with moderate
hand force and turn the actuator counter-clockwise
by 1/8 turn (45 degrees). Lift actuator off the valve
body.
3. The valve may be installed with flow from A to B, or
B to A (Fig. 2). The valve body may be plumbed in
any angle but not with the actuator below the hori-
zontal level of valve body (Fig. 3). Make sure there
is enough room around the actuator for servicing or
replacement. Install the valve in a good location for
future maintenance, leaving an extra 25 mm head
clearance required to remove the actuator.
4. Prepare the pipes according to valve connections.
5. For compression fitted models, tighten the compres-
sion nuts enough to make a watertight seal.
Maximum torque limit is 45 Nm for the 22 mm
compression fitting, and 65 Nm for the 28 mm
compression fitting
- Take care not to over tighten
6. Either hold valve body in your hand (Fig. 5-A) or
attach adjustable spanner (38mm or 1-1/2") across
the hexagonal or flat faces on the valve body (Fig.
5-B). If assembly valve train on a bench, take care
not to deform body with vice. Do not place the raised
"H" logo between the jaws of the vice. Excess jaw
force can deform the body.
7. Install the actuator by reversing the process in (2).
4.4 Commissioning hydronic system
For trouble-free operation of the product, good instal-
lation practice must include initial system flushing,
chemical water treatment, and the use of fine system
side stream filter(s).
Put the VC actuator manual lever (Fig. 6) in the manual
open (middle) position to allow initial system flushing
with the actuator mounted. This operation must be
done without electrical hook-up
5
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