Honeywell VU843A User Manual

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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