Install Instructions

V4043, V4044 VALVES; V8043, V8044 ZONE VALVES
95-6983—11 10
OPERATION AND CHECKOUT
CAUTION
On 24 V systems, never jumper the valve coil
terminals even temporarily. This may burn out
the heat anticipator in the thermostat.
NORMALLY CLOSED MODELS
With the manual opener set to AUTO and the powerhead
energized, the valve is opened as shown in Fig. 30A.
When the powerhead is de-energized, a spring-return
mechanism drives the valve to the closed position as
shown in Fig. 30B. 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 will return to the automatic
position when the valve is energized.
Auxiliary switch is not energized when the valve is
manually opened.
NORMALLY OPEN MODELS
When the powerhead is de-energized, a spring-return
mechanism drives the valve to the open position (Fig.
30A). When energized, the valve is closed as shown in
Fig. 30B. A reverse-acting thermostat is required to
control a normally open valve.
NOTE: Inlet Port is stamped “A”, Outlet Port is stamped
“B” on the valve body.
Fig. 30. V8043 operation for normally closed valve.
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 open-
ing stroke.
3. Lower the setpoint on the zone thermostat 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 pow-
erhead assembly. See the Installation section. If the
motor is burned out, replace the motor. See
Replacement Parts list in the TRADELINE® Cata-
log.
NOTE: Honeywell zone valves are designed and tested
for silent operation in properly designed and
installed systems. However, water noises may
occur as a result of excessive water velocity or
piping noises may occur in high temperature
(over 212° F [100° C]) systems with insufficient
water pressure.
NOTE: These hydronic valves are not suitable for use in
open loop systems where there is air exposure.
B
OUT
OPEN POSITION
A
A
IN
B
OUT
CLOSED POSITION
B
A
IN
M5951