Bell & Gossett V1000187C Circuit Setter Plus Calibrated Balance Valves – Lead-Free - Manual (Page 4)

NOTICE: If a high degree of throttling of flow at pump discharge is required, Bell & Gossett recommends
that the pump impeller be sized to produce design flow. This will reduce electrical energy consumption.
WARNING: Hot water leakage can occur from readout valves (P/T ports) during probe insertion and during
hookup of readout kit. Follow the instruction manuals supplied with readout probes and readout kits for safe
use. Failure to follow these instructions could result in serious personal injury or death and property damage.
How to use Bell & Gossett Circuit Setter Balance Valves as flow meters
1. Energize the zone, circuit, and/or system pump(s) as applicable.
2. Using Bell & Gossett Model RP-250B Readout Probes, sequentially attach a Bell & Gossett differential pressure read
out kit to the readout valves on each Circuit Setter Balance Valve.
3. Read the differential pressure across the orifice of the Circuit Setter balance valve.
4. Using Side #2 of the Circuit Setter Balance Valve Calculator (V91483), set the hairline over the degree of closure as
indicated by the part of the red plastic knob or indicator plate parallel to the degree of closure noted on the calibration
plate, and read actual GPM flowing through the Circuit Setter opposite the gauge reading head loss noted in the white
section of Side #2.
NOTE: If the system contains a liquid with a specific gravity and/or viscosity higher or lower than that of water, apply
the appropriate correction factor noted in these instructions to obtain the actual GPM for the system liquid.
How to use Bell & Gossett Circuit Setter Balance Valves as an isolation valve
1. Move the adjustment knob or stem until the position indicator aligns with the closed position on the calibration
plate.
2. Close the isolation valve on the other side of the equipment to be serviced.
3. Open the drain valve to drain the system between the Circuit Setter and the second isolation valve.
WARNING: Check for proper sealing when using as an isolation valve. If the seat is not sealing properly, liquid
will continue to flow from the drain valves. In this case, the Circuit Setter must be isolated from the system
and replaced. Failure to follow these instructions could result in serious personal injury or death and property
damage.
8. Adjust pump flow so that circuits are receiving their design flow. This can be accomplished by adjusting a Circuit
Setter balance valve installed on the pump discharge or by changing the pump impeller size.
How to use the memory stop feature
1. Make the final degree of closure setting.
2. Loosen the memory stop locking screw in the slot on the top of red knob.
3. Slide the memory stop screw in the slot (counter-clockwise for ½” thru 1” sizes and clockwise for 1-1/4” thru 3”
sizes) until screw stops.
4. Tighten the memory stop screw.
WARNING: Hot water leakage can occur from readout valves (P/T ports) during probe insertion and during
hookup of readout kit. Follow the instruction manuals supplied with readout probes and readout kits for safe
use. Failure to follow these instructions could result in serious personal injury or death and property damage.
How to use Bell & Gossett Circuit Setters to proportionally Balance a system
1. Open fully all Circuit Setters on a single pump system.
2. If more than one branch circuit is used, start the balance procedure by reading all of the flows to the units in a
branch. Each unit (coil) should have its own Circuit Setter for flow balancing. Using Bell & Gossett RP-250B readout
probes, sequentially attach a Bell & Gossett differential pressure readout kit to the readout valves (P/T ports) on each
Circuit Setter balance valve.
3. Using Side #2 of the Bell & Gossett Circuit Setter Balance Valve Calculator (V91483), with the top hairline set on zero
for the size Circuit Setter being read, read the flow corresponding to the pressure drop read with the readout kit.
4. Calculate the ratio of the actual flow to the design flow for each unit in the branch. This is the proportional flow
rate. (Actual flow divided by design flow).
5. Select the Circuit Setter with the lowest proportional flow rater. This Circuit Setter is left in the full open position.
Every other Circuit Setter in the branch is then reset to the same proportional flow rate.
6. If there are additional branches, repeat the Steps #3, #4, and #5 above for each branch.
7. After all branches have been proportionally balanced, measure the full open flows on the Circuit Setters installed on
the risers. Calculate the proportional ratio of each riser Circuit Setter and select the one with the lowest proportional
ratio. This Circuit Setter is left fully open and the other riser Circuit Setters are adjusted to this same ratio as described
in Step #5 above.