Bell & Gossett G95873N Circuit Setter Plus Balance Valves With NPT, Flanged and Solder Connections - Manual (Page 2)

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INSTALLATION INSTRUCTIONS
To retain calibrated accuracy, a minimum length of unrestricted
straight pipe equivalent to 3-pipe diameters upstream and
1-pipe diameter downstream must be maintained immediately
adjacent to Circuit Setter Balance Valves.
Circuit Setter Balance Valves are bi-directional valves and can
be installed in most altitudes, however, they should be
installed in a position to facilitate the ease of balancing the
system.
NPT and sweat style Circuit Setter Balance Valves are
equipped with
1 / 4 " NPT plugged drain port. If the drain port is
to be used to drain a riser on the downstream side of a termi-
nal unit, it should be situated on the terminal unit side of the
riser when installing the Circuit Setter.
CIRCUIT SETTER BALANCE VALVES
WITH SWEAT CONNECTIONS
1. Use a torch with a sharp pointed flame.
2. Clean tube ends and Circuit Setter connections thoroughly.
3. Use 95-5 (Tin-Antimony) solder and a good grade of flux.
4. When sweating the joints, first wrap the valve body with a
cool wet rag, then direct the flame with care to avoid sub-
jecting the Circuit Setter to excessive heat. Allow the valve
body to cool below 200°F before installing the (2) Model
RV-125A Readout Valves packaged with the Circuit Setter
Balance Valve.
5. Check soldered connections for leaks. If resoldering is
required, remove the readout valves before applying the
torch to the connection(s).
CIRCUIT SETTER BALANCE VALVES
WITH NPT CONNECTIONS
1. Apply pipe compound conservatively to male connecting
fittings only.
2. Check connections for leaks.
CIRCUIT SETTER BALANCE VALVES WITH 125 PSI
ANSI FLANGED CONNECTIONS
Flanged Circuit Setter Balance Valves are not furnished with
companion flanges, gaskets, nuts and bolts.
1. When installing Circuit Setter Balance Valves with flanged
connections, care should be taken to prevent the gaskets
from extending into the inside diameter of the pipe which
will cause a blockage that will affect the accuracy of the
Circuit Setter.
2. Check connections for leaks.
OPERATION INSTRUCTIONS
HOW TO USE BELL & GOSSETT CIRCUIT SETTER
BALANCE VALVES FOR PRE-SET FLOW BALANCING
All Circuit Setter Balance Valves within a common zone, cir-
cuit, or system, with a common pump, are brought into bal-
ance with each other by establishing a common BALANCE
GOVERNING HEAD LOSS as noted.
1. Identify the zone within a given circuit or circuit within a
given system with the highest head loss.
2. Establish the value of the head loss in feet of water.
3. Establish the corresponding required GPM.
4. Select the appropriate size Circuit Setter Balance Valve
(normally line size) for the required GPM.
5. Using Side #1 of the V91483 Circuit Setter Balance Valve
Calculator, set the degree of closure hairline in the red
section of the Calculator over the 0° setting for the appro-
priate size Circuit Setter and read the head loss opposite
the required GPM. The setting for this Circuit Setter will
remain 0°.
6. Add the head loss in Step “5” to the head loss in Step “2”
to establish the Balance Governing Head Loss for the zone
or circuit.
7. Subtract the required head loss for each zone circuit from
the Balance Governing Head Loss in Step “6” to establish
the head loss difference for each zone or circuit which is to
be brought into balance with Step “6”.
IMPORTANT: Bell & Gossett Circuit Setter Balance Valves
are not recommended for use with meter connections
pointing down. Dirt will collect in the connections and foul
up the readout valves and readout meters.
CAUTION: Excessive use of solder in a vertical
installation may result in damage to the valve seat
and ball. Do not use excessive flux. Failure to follow these
instructions could result in property damage and/or
moderate personal injury.
CAUTION:
lubricity. Care should be taken to prevent overtightening of
the readout valves which may damage the Circuit Setter.
CAUTION: Heat associated with the use of silver
solder may damage a Circuit Setter voiding the
warranty. Do not use silver solder. Failure to follow these
instructions could result in property damage and/or
moderate personal injury.
CAUTION:
lubricity. Care should be taken to prevent overtightening of
the readout valves which may damage the Circuit Setter.
compound and PTFE tape on threads provides
The use of PTFE impregnated pipe
The use of PTFE impregnated pipe
compound and PTFE tape on threads provides
8. The head loss difference in Step “7” and the required GPM
in Step “3” are lined up in the white section of Side #1 of
the Calculator. The degree of closure for the specific Circuit
Setter Balance Valve is shown under the degree of closure
hairline in the red section of the Calculator for the appropri-
ate size Circuit Setter.
9. Adjust the Circuit Setter by turning the red knob by hand on
sizes 1 / 2 " thru 1", or by placing a wrench on the wrench
flats provided on sizes 1 1 / 4 " thru 4" to the set position
determined by the preceding procedure.
NOTES:
1. Head losses in Steps “6” and “2” are a fixed head require-
ment the zone, circuit, or system pump, as required, must
overcome.
2. Refer to the G95872 prewired tag packaged with the Circuit
Setter Balance Valve and fill in the appropriate information.
Attach the tag to the Circuit Setter for future reference.
WARNING: It is possible, depending on the age or
condition of the stem seal, for some liquid to escape
during Circuit Setter adjustment. Do not have eyes or face
on a level with the sides of the Circuit Setter. Failure to
follow this warning could result in serious personal injury.