Bell & Gossett V1000520 Ultra Setter Pressure Independent Control Valves - Manual (Page 15)

Operation
Operate the valve
WARNING:
• Burn hazard. Water temperatures higher than 100°F (38°C) can be dangerous. Take all
necessary precautions to prevent water or steam leakage.
• Hot water leakage can occur from readout valves during probe insertion and during
hookup of readout kit. Follow the safety instructions supplied with readout probes and
readout kits.
CAUTION:
Avoid pipe strain. This can cause breakage and water loss over time.
1. Ensure that the valve is fully open.
2. Using Bell & Gossett Model RP250–B Readout Probes, attach a Bell & Gossett
differential pressure readout kit to the readout valves on the desired valve.
3. Measure the pressure differential across the readout valves (P/T ports) in the valve
body, or in the valve body and through the valve handle. Confirm that the value
obtained is greater than the minimum value indicated in the valve submittal. If it is not,
then investigate the causes and if necessary, report to the designer.
4. Adjust the flow setting dial to the specified design flow rate. Lock the dial-in position
and record settings.
5. Repeat the process for all valves on the branch.
6. Measure the flow rate indicated at the flow measurement device on the branch.
Confirm that the value recorded is equal to the sum of the flows that are set at
downstream valves. If it is not, then investigate the causes and if necessary, report to
the designer.
When a flow measurement device is not present on the branch, measure the
differential pressure across the valve and verify the minimum differential pressure
listed in the submittal to achieve desired flow rate.
7. Repeat this procedure until all valves in the system have been set and their summated
flows checked against upstream flow measurement devices or differential pressure
verification.
8. Measure the differential pressure across the valve on the system index terminal (usually
the most remote terminal from the pump). Adjust the pump speed until the pressure
differential across this valve is equal to the minimum value indicated in the submittal.
9. Determine the pressure differential at the sensor location. Set the pump speed to
control such that the value indicated at the sensor is maintained constant under all
conditions.
10. Measure and record the total flow rate, pressure differential, and energy consumption
at the pump.
11. Run all two port valves to their closed positions. Measure and record the total flow rate,
pressure differential, and energy consumption at the pump. Calculate and report the
overall energy saving that is achieved between full load and minimum load operation.
Operation
Ultra Setter ™ Pressure Independent Control Valves Installation, Operation and Service Manual 13