Balancing Manual Circuit Setter Valve - Trane UniTrane Installation, Operation And Maintenance Manual

• Supply and return water piping connections
• Condensate drain lines and connections
• Fresh air intake duct connections
• Discharge duct connections
• Wall boxes
Balancing 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 the figure below.
Figure 34. Manual circuit setter valve
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, lift off the actuator and
turn the valve stem. Actuator can be used to turn the
valve stem.
2. For presetting, use the appropriate valve curve shown
in Figure 35, p. 57 to determine which setting is
necessary to achieve the appropriate pressure drop.
The "M" line is the appropriate line.
3. Carefully remove the Schrader pressure port
connection 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 pressure drop. Refer to the gauge operating
instructions.
5. Adjust the circuit setter valve by turning the valve stem
until the appropriate pressure drop is achieved.
UNT-SVX07J-EN
Coil Piping and Connections
6. After achieving the proper setting, slightly loosen the
two socket head cap screws and rotate the memory
stop around until it touches the back side of the
indicator. Then tighten the screws to securely set the
open memory position. The memory stop indicates the
last set open position.
7. If using a three-way valve: close the control valve to the
coil, with the differential pressure meter still
connected. This will divert flow to the bypass side of a
three-way valve.
Adjust the balancing fitting to obtain the same pressure
drop across the circuit setter valve as in step two when the
control valve was open to the coil.
Figure 35. Manual circuit setter valve, differential
pressure vs. flow
Note: Instructions for using this chart appear on the
preceding page. For the manual circuit setter
provided with fan-coil or Force-Flo units, use the
'M'.
57