Installation and Maintenance Manual

Installation—Piping
UV-SVN02C-EN 27
2. Install body valve into pipe.
3. Wiring connections may be made either before or after
actua
tor installed on body.
4. Place the manual operating leve
r on the actuator in the
OPEN position.
5. Align actuator coupling to slot on the shaf
t of the valve
body and fit the head onto the valve body to ensure the
shaft seats correctly (see Figure 22).
6. Press the actuator and valve body until it secures
together
.
Soldering procedures are as follows:
1
. Remove actuator as stated earlier.
2. Place valves on the pipe. Rotate valve stem so the shaf
t
slot points at the notch in the side of the body (90O to
flow direction). This protects the plug inside the valve
by removing it from the seat (see Figure 23).
3. Sweat the joints, keeping outer surface free from
solder.
Note: Do not use silver solder due to high
temperature requirements.
Heating Coils with Direct
Expansion Cooling
Heating options for direct expansion cooling in the unit
ventilator are hot water, steam or electric heat.
These coils facilitate direct expansion cooling with
standard capacities. The supply and return connections
are located in the right hand end pocket. Hot water field
connections are made with a 5/8 in.\[15.9\] OD male
sweated joint, while steam coils have a 1 in.\[25.4\] male
pipe thread (MPT) connection (see Tabl e 10, p . 2 3 ).
Electric heat coils provide a third way to supply heating to
the direct expansion cooling. The coil utilizes three to six
preheat elements which are factory-wired.
Figure 22. Installing isolation valve actuator
Figure 23. Preparation for soldering
UV-SVN02_-EN.book Page 27 Thursday, January 24, 2013 4:48 PM