Manual Opener; Isolation Valves; Installation; Servicing/Removal Of Valves - Trane HUV Installation, Operation And Maintenance Manual

Installation—Piping
Figure 19. Proper plumbing technique for modulating
valves

Manual Opener

The manual opener can be manipulated only when in the
up position. The A port can be manually opened by firmly
pushing the white manual lever down to the midway
position and pushing the lever in. In this position, both A
and B ports are open. This "manual open" position may be
used for filling, venting and draining the system or
opening the valve during power failure.
The valve can be closed by depressing the white lever
lightly and then pulling the lever outward. The valve and
actuator will return to the automatic position when power
is restored.
Note: If the valve is powered open, it cannot be manually
closed, unless the actuator is removed.
Typical floating controller is an SPDT controller with a
center-off position. On a change in temperature from the
set point, the controller will close the NO or NC contacts,
driving the valve to an intermediate position until a further
change at the controller.
The valve is set between the limits of the controller to
satisfy various load requirements. In the event of power
failure, the valve will stay in the position it was in before
loss of power. When power is restored, the valve will again
respond to controller demand.

Isolation Valves

Installation

The valve can be mounted in any position on a vertical line.
If the valve is mounted horizontally, the actuator must be
even with or above the center line. Make sure there is
enough room to remove actuator cover for servicing.
Mount the valve on the tube or pipe.
Note: Make sure the flow through the valve is in the
direction indicated by the arrow stamped on the
valve body.
26
Figure 20. Proper mounting for isolation valves

Servicing/Removal of Valves

The actuator can be removed from the valve body.
Removing the actuator is recommended of soldering is
being conducted near the valve.
To remove the actuator:
1. Place the manual operating lever in the Open position
(see Figure 21, p. 26).
Figure 21. Removing isolation valve actuator
2. Depress the locking button and lift actuator until it
separates from the valve body.
To install the actuator to the valve body:
1. Align the slot on the shaft of the valve with the valve
body notch on side of body (see Figure 22, p. 27).
UV-SVN02C-EN