Product Overview
Table Of Contents
V4043A,B,E,J; V4044A,B; V8043A,B,E,F,J; V8044A,B,E MOTORIZED VALVES
19 60-2133—12
Fig. 35. Wiring a V8043F to a White-Rodgers System
(alternate option).
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.
Operation
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 powerhead
energized, the valve is opened as shown in Fig. 36A. When
the powerhead is de-energized, a spring-return
mechanism drives the valve to the closed position as
shown in Fig. 36B. 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.
NORMALLY OPEN MODELS
When the powerhead is de-energized, a spring-return
mechanism drives the valve to the open position
(Fig. 36A). When energized, the valve is closed as shown in
Fig. 36B. 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. 36. 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.
NOTE: Resideo 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 insuf-
ficient water pressure. Valves are designed for
normal cycling operations. Product life will be
shortened if energized continuously.
NOTE: These hydronic valves are not suitable for use in
open loop systems where there is air exposure.
THERMOSTAT
END SWITCH
L1
(HOT)
L2
V8043F
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
IF TRANSFORMER SUPPLIES POWER TO AUXILIARY CIRCUIT,
WIRE AUXILIARY CIRCUIT AS SHOWN IN LOWER DIAGRAM.
TAPE UNUSED END AND TUCK INTO HOLE.
1
2
3
1
2
3
4
5
6
L1
(HOT)
L2
1
TO
AUXILIARY
CIRCUIT
TO
AUXILIARY
CIRCUIT
2
END SWITCH
TH-TR
TH TR
M5714
B
OUT
OPEN POSITION
A
A
IN
B
OUT
CLOSED POSITION
B
A
IN
M5951