VU443A; VU444A; VU843A; VU844A
Fan Coil Valve Actuators
PRODUCT DATA
The VU443, VU444, VU843, and VU844 Fan Coil Valve
Actuators are used in conjunction with the VU52, VU53, and
VU54 fan coil valves for controlling the flow of hot or chilled
water. These valves are humidity resistant and are suitable for
use in condensing, non-corrosive environments.
SPECIFICATIONS
Actuator Electrical Rating & Connections: 10 VA maxi-
mum.
Control
CIrcuit
Current
End
Connection
/Leads
Model
VU443A
VU443E
Draw (A)
Switch
Application
End Switch Rating:
2.2 A inductive from 5 to 110 Vac.
1.0 A inductive above 110 Vac to 277 Vac.
Min. DC switching capability: 5 mA @ 24 Vdc.
None
SPST
2-way, normally
open (use
VU444,
6” motor
leads
standard.
120V,
60Hz
0.07
0.32
VU844);
VU444A
VU843A
None
None
2-way, normally
closed (use
VU443,
Maximum Ambient @ Fluid Temperature Rating:
Standard models (with class A motor):
18”, 36”, or
96”
Leadwires
optional.
24V,
VU843);
125° F (52° C) ambient @ 200° F (93° C) fluid.
VU844A 50-60Hz
3-way, diverting
(use VU444,
VU844).
Minimum Ambient Temperature: 34° F (1° C).
Shipping and Storage Temperature: -40° F to 150° F (-40°
Note: Motors for all the above models are Class A, Plated.
C to 65° C).
Atmosphere: Non-corrosive, non-explosive, condensing.
Noise Rating: Low noise - non-obtrusive.
Materials:
Case: stainless steel.
Cover: aluminum.
Sector gear: reinforced with KEVLAR brand fiber.
®
®
KEVLAR is a Dupont registered trademark.
Approvals: CSA C/US Certified.
Dimensions: See Fig. 1.
95C-10883-03
VU443A; VU444A; VU843A; VU844A FAN COIL VALVE ACTUATORS
TO ATTACH FLEXIBLE CONDUIT
1. Strip cable jacket.
2. Fit conduit strain relief onto cable.
3. Slide strain relief nut over wires.
4. Connect cable and actuator wires.
5. Slide cable wires down through slot in the wiring hole,
so that the strain relief nut is inside the actuator hous-
ing.
ACTUATOR
COUPLING
6. Secure nut onto strain relief.
7. Install actuator cover.
FAN COIL THERMOSTAT
(TYPICALY T4039, T6380, TB6570)
NOTCH
ELECTRONICS
ENSURE SHAFT
SLOT POINTS
TOWARDS NOTCH
ON SIDE OF BODY
FOR FITTING INTO
ENGAGING SHAFT
L1
(HOT)
L1
H/C
L2
L2
M32206
Fig. 2. Installing new actuator.
VU ACTUATOR
REMOVING ACTUATOR FROM THE VU-SERIES VALVE
BODY ASSEMBLY (SEE FIG. 3)
MOTOR
NOTE: It is not necessary to drain the system if the valve
body assembly remains in the pipeline.
1. Switch power supplies OFF. Disconnect electrical leads,
carefully noting the position and colour of each lead.
2. Place the manual operating lever in the MAN. OPEN
position.
M32082B
Fig. 4. Typical wiring for VU40-series actuator.
3. Remove actuator by depressing locking button and lift-
ing straight up.
T822
T822
T822
L1
(HOT)
L2
1
2
2
2
VU VALVE
VU VALVE
VU VALVE
AUTO
OPEN
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
1. PLACE MANUAL
LEVER IN OPEN
POSITION
2. DEPRESS
LOCKING
BUTTON
CONNECT BLACK LEADWIRE TO THERMOSTAT.
M32083
3. LIFTACTUATOR
STRAIGHT UP
Fig. 5. T822 Thermostat, VU80-series actuator hookup.
OPERATION
M32207
CAUTION
Fig. 3. Removing actuator from valve body.
On 24V systems, never jumper the valve coil
terminals even temporarily. This can burn out the
heat anticipator in the thermostat.
WIRING
AUTOMATIC OPERATION
On a call for heat or cool by the fan coil thermostat, the valve
motor operates, opening the valve. When the call ends, the
valve closes by integral spring return.
Disconnect the power supply before connecting wiring to
prevent electrical shock or equipment damage. All wiring must
comply with local codes and ordinances.
3
95C-10883—03
VU443A; VU444A; VU843A; VU844A FAN COIL VALVE ACTUATORS
MANUAL OPERATION
CHECKOUT
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.
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.
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.
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.
NORMALLY OPEN
With the manual opener set to AUTO and the actuator
energized, the A port is closed as shown in Fig. 6B.
SERVICE
This valve should be serviced by a trained, experienced
service technician.
NOTE: Inlet and Outlet Ports are indicated by a flow direc-
tion arrow on the valve body.
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.
IN
IN
OUT
OUT
CLOSED POSITION
(UNPOWERED)
OPEN POSITION
(POWERED)
M32202
Fig. 6a.
Fig. 6b.
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.
Fig. 6. Actuator operation for normally closed 2-way
valve.
A
B
A
B
IN
OUT
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.
AB
IN
AB
IN
FLOW-THROUGH SERVICE PORT
(POWERED)
FLOW-THROUGH BYPASS PORT
(UNPOWERED)
Fig. 7b.
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.
M32205
Fig. 7a.
Fig. 7. Actuator operation for normally closed 3-way
valve.
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
® U.S. Registered Trademark
© 2010 Honeywell International Inc.
95C-10883—03 T.D. Rev. 09-10
Printed in U.S.A.
Golden Valley, MN 55422
customer.honeywell.com
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