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Automation & Control
Honeywell
1985 Douglas Drive North
Golden Valley
MN 55422-3992
In Canada
Honeywell Limited/Limitée
35 Dynamic Drive
Toronto, Ontario
M1V 4Z9
CHECKOUT
1. Raise the setpoint on the zone
thermostat above the room
temperature to initiate a call for heat.
2. Observe all control devices—the valve
should open and the auxiliary switch
should make the circuit to the
circulator or other valve at the end of
the opening stroke.
3. Lower the setpoint on the zone
thermostat to below the room
temperature.
4. Observe the control devices. The valve
should close and the auxiliary
equipment should stop.
SERVICE
This valve should be serviced by a trained,
experienced service technician.
1. If the valve is leaking, drain the system
and check to see if the O-ring needs
replacing.
2. If the gear train is damaged, replace
the entire actuator assembly. See the
Installation section. If the motor is
burned out, replace the motor. See
Replacement Parts list in the
TRADELINE® Catalog.
NOTE: Honeywell zone valves are designed
and tested for silent operation in
properly designed and installed
systems; however, water noises can
occur as a result of excessive water
velocity or piping noises can occur in
high temperature (higher than 212°F
(100°C) systems with insufficient water
pressure. Valves are designed for
normal cycling operations. Product life
will be shortened if energized
continuously.
OPERATION
CAUTION
On 24V systems, never jumper the valve
coil terminals even temporarily. This can
burn out the heat anticipator in the
thermostat.
Automatic Operation
On a call for heat by the zone thermostat,
the valve opens and its auxiliary switch
contacts make, closing the circuit to the
system circulator. In a multizone system with
all the valve auxiliary switches wired in
parallel, any zone calling for heat can operate
the circulator. When the call for heat ends, the
valve closes by integral spring return. The
auxiliary switch contacts break the circulator
circuit.
Manual Operation
The motorized valve can be opened
manually by lifting the manual opening lever
over the stop and pushing slowly and firmly to
the MAN. OPEN position. The stop permits
the valve to be locked in the open position.
The valve returns to automatic position when
the valve is energized.
Normally Closed Models
With the manual opener set to AUTO and
the actuator energized, the valve is opened
as shown in Fig. 28A. When the actuator is
de-energized, a spring-return mechanism
drives the valve to the closed position as
shown in Fig. 28B. The valve can also be
opened with no electrical power by moving
the manual opening lever over the stop and
pushing slowly and firmly to the MAN. OPEN
position. The stop permits the valve to be
locked in the open position.
The valve returns to the automatic position
when the valve is energized.
Auxiliary switch is not energized when
the valve is manually opened.
NOTE: Flow direction arrow is stamped on
the valve body indicating flow
direction from Inlet Port A to Outlet
Port B.
B
OUT
OPEN POSITION
A
A
IN
B
OUT
CLOSED POSITION
B
A
IN
M5951
Fig. 28 - V8043 operation for normally closed valve.