Installation and Maintenance Manual

Installation—Mechanical
UNT-SVX07D-EN 39
2. For units with manual air vents, back the set screw out
to expel air from the unit and then re-tighten the set
screw.
The automatic air vent
should require no adjustment for
the coil to vent. However, if the coil does not vent
immediately, unscrew the outer portion of the fitting to
expel air from the port.
If debris has become trapped in the vent, completely
remove the outer portion of the fitting and clean.
External Insulating Requirements
Insulate and vapor seal surfaces colder than surrounding
air dew-point a to prevent unplanned condensation. Trane
recommends field-insulation of the following areas to
prevent potential condensate problems:
1. Supply and return water piping connections
2. Condensate drain lines and connections
3. Fresh air intake duct connections
4. Discharge duct connections
5. Wall boxes
Balancing The Manual Circuit Setter Valve
The manual circuit setter valve is an optional end valve
supplied on the return pipe of the factory piping package.
The valve allows the operator to regulate water flow
through the hydronic coil, balance the water flow through
the unit with other units in the piping system, and serves
as a shutoff or end valve. See Figure 9.
Perform the following procedure to set maximum water
flow through the coil:
1. Establish water flow through the coil. Perform an open
override of the valve if the control valve is closed to the
coil, either manually or by Tracer.
If the piping package has two-position, normally
closed valves: Drive open the valve using a 24 V signal.
If the piping package has two-position, normally open
valves: Manually drive open the valve by removing
power to the valve.
If the piping package has modulating valves: To
manually drive the valve open, depress the button
stem on top of the valve and push the lever located on
the side of the valve to the full open position.
2. For presetting, use the appropr
iate valve curve shown
in Figure 12, p. 40 to determine which setting is
necessary to achieve the appropriate pressur
e drop.
The “M” line is the appropriate line.
3. Carefully remove the Schrader pressure port
co
nnection caps on the manual circuit setter, since they
will be at the same temperature as the pipeline.
4. Bleed all air from the hoses and meter before reading
the pre
ssure drop. Refer to the gauge operating
instructions.
Figure 9. Manual circuit setter valve
Figure 10. Automatic circuit setter valve
Figure 11. Automatic circuit setter valve
UNT-SVX07_-EN.book Page 39 Friday, April 27, 2012 9:40 AM