Trane UniTrane Fan-Coil & Force Flo Air Conditioners Balancing The Manual Circuit Setter Valve

mechanical

Installation requirements

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 I-MR-8.

Follow the procedure below 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 24V 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 appropriate valve curve shown in Chart I-MR-1 on page 34 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.

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 I-MR-8. Manual circuit setter valve

Figure I-MR-9. Automatic circuit setter valve

Figure I-MR-10. Automatic circuit setter valve

UNT-SVX07A-EN 33