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Honeywell VU443A Product Data page 4

Fan coil valve actuators
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VU443A; VU444A; VU843A; VU844A FAN COIL VALVE ACTUATORS
MANUAL OPERATION
The 2-way normally closed and 3-way motorized valve
actuators 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 it is energized.
NORMALLY CLOSED
With the manual opener set to AUTO and the actuator
energized, the A port is opened as shown in Fig. 6A and 7A.
When the actuator is de-energized, a spring-return
mechanism drives the valve to the port A closed position as
shown in Fig. 6B and 7B. 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 an open
position. The valve returns to the automatic position when the
valve is energized.
NORMALLY OPEN
With the manual opener set to AUTO and the actuator
energized, the A port is closed as shown in Fig. 6B.
NOTE: Inlet and Outlet Ports are indicated by a flow direc-
tion arrow on the valve body.
IN
OUT
OPEN POSITION
(POWERED)
Fig. 6a.
Fig. 6. Actuator operation for normally closed 2-way
A
IN
AB
IN
FLOW-THROUGH SERVICE PORT
(POWERED)
Fig. 7a.
Fig. 7. Actuator operation for normally closed 3-way
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
customer.honeywell.com
IN
OUT
CLOSED POSITION
(UNPOWERED)
M32202
Fig. 6b.
valve.
B
A
B
OUT
AB
IN
FLOW-THROUGH BYPASS PORT
(UNPOWERED)
M32205
Fig. 7b.
valve.
CHECKOUT
SET TO HEATING MODE
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.
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.
SET TO COOLING MODE
1. Lower the setpoint on the zone thermostat below the
room temperature to initiate a call for cooling.
2. Observe all control devices - the valve should open.
3. Raise the setpoint on the zone thermostat above the
room temperature.
4. Observe the control devices. The valve should close.
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.
See the Installation section. If the motor is burned out,
replace the motor.
3. Wear safety glasses to protect eyes from injury
when removing or installing the large spring clip
that holds the actuator plate to the valve body. Use
proper snap ring pliers to remove or install spring
clip.
NOTE: Honeywell fan coil 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 continu-
ously or if operated above rated temperatures.
Use VU443/843 actuators ONLY with VU53 2-way normally
close valve bodies. Water hammer may result and actuator
life will be shortened if used on VU54 3-way body.
Use VU444/844 actuators on either VU52 2-way normally
open bodies or VU54 3-way diverting valve bodies. Close-off
pressure ratings will be reduced when used with VU53.
® U.S. Registered Trademark
© 2010 Honeywell International Inc.
95C-10883—03
T.D. Rev. 09-10
Printed in U.S.A.

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