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

Coil Piping and Connections
Valve Stroke Time
Table 11. Valve stroke time
Valve Selection
1.4 Cv, 1/2 in. 2-Way Modulating Valve
2.4 Cv, 1/2 in. 2-Way Isolation Valve
3.4 Cv, 1/2 in. 2-Way Modulating Valve
4.8 Cv, 1/2 in. 2-Way Modulating & 2 Position
Valve
5.9 Cv, 1/2 in. 2-Way Modulating Valve
2.3 Cv, 3/4 in. 2-Way Modulating & 2 Position
Valve
3.3 Cv, 3/4 in. 2-Way Modulating Valve
4.6 Cv, 3/4 in. 2-Way Modulating & 2 Position
Valve
6.6 Cv, 3/4 in. 2-Way Modulating Valve
2.7 Cv, 1/2 in. 3-Way Modulating & 2 Position
Valve
4.6 Cv, 3/4 in. 3-Way Modulating Valve
7.4 Cv, 3/4 in. 3-Way Modulating & 2 Position
Valve
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 shut-off or end
valve. See the figure below.
Figure 19. 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.
26
End Stop Stroke Time
Position (seconds)
No end stop 75
5 55
6 62
N 68
No end stop 75
4 49
5 55
6 62
N 68
No end stop 75
No end stop 75
N/A 90
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 17, p. 25 and Figure 18, p. 25
setting is necessary to achieve the appropriate pressure
drop.
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 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.
Crossover Piping
Crossover piping is available for all hydronic coils. It is either
1 3/8 in. or 2 1/8 in. in diameter (OD) as specified by the
customer. Crossover piping can be found in either the left or
right hand end pocket. Refer to
p. 11 for dimensional data.
On 4-pipe coils, crossover piping connects to the main cooling
coil.
Factory insulation is provided on all crossover piping.
When a Trane piping package is ordered, it is installed with the
connections made to the supply and return of both the coil and
the crossover piping. However, supply and return connections
must be made in the field when a piping package is furnished
by the installer.
The crossover piping is located at the back of the unit along the
wall and the ends of the piping are flush with the end of the unit.
Expansion compensation between the piping package and the
crossover piping is achieved using flex hoses rated at 250 psi
working pressure. Expansion compensation for the crossover
piping must be handled external to the unit ventilator.
to determine which
"Dimensions and Weights,"
UV-SVX005G-EN