User Guide

VU53F,N,S,T; VU54F,N,S,T; VU443A; VU444A; VU843A; VU844A
FAN COIL VALVES AND ACTUATORS
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. See Fig. 8.
3. Remove actuator by depressing locking button and
lifting straight up.
Wiring
Disconnect the power supply before connecting wiring to
prevent electrical shock or equipment damage. All wiring
must comply with local codes and ordinances.
See Fig. 9 and 10 for typical hookups.
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 housing.
6. Secure nut onto strain relief.
7. Install actuator cover.
FAN COIL THERMOSTAT
(TYPICALY T4039, T6380, T6570)
L1
(HOT)
L2
VU448 ACTUATOR
ELECTRONICS
MOTOR
L1 L2H / C
Fig. 9 Typical wiring for VU440-series actuator.
L1
(HOT)
L2
1
2 2 2
T822 T822 T822
VU VALVE
VU VALVE
VU VALVE
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
CONNECT BLACK LEADWIRE TO THERMOSTAT.
Fig. 10 T822 Thermostat, VU80-series actuator hookup.
OPERATION
CAUTION
ON 24V SYSTEMS, NEVER JUMPER THE VALVE
COIL TERMINALS EVEN TEMPORARILY. THIS CAN
BURN OUT THE HEAT ANTICIPATOR IN THE
THERMOSTAT.
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.
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 Models
With the manual opener set to AUTO and the actuator
energized, the A port is opened as shown in Fig. 11A and
12A. When the actuator is de-energized, a spring-return
mechanism drives the valve to the port A closed position as
shown in Fig. 11B and 12B. 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
IN
OUT
IN
OUT
OPEN POSITION
(POWERED)
CLOSED POSITION
(UNPOWERED)
M5951
Fig. 11A
Fig. 11B
Fig. 11 Actuator operation for normally closed 2-way valve.
B
A
B
A
OUT
OUT
A
B
IN
A
B
IN
FLOW-THROUGH SERVICE PORT
FLOW-THROUGH BYPASS PORT
(POWERED)
(UNPOWERED)
Fig. 12A
Fig. 12B
Fig. 12 Actuator operation for normally closed 3-way valve.
95C-10885
6