Bell & Gossett G95858H Circuit Setter Plus “RF” Balance Valves - Manual (Page 3)

3
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 the adjustment knob.
3. Rotate the plastic ring under the adjustment knob counter-
clockwise until the tab on the plastic ring stops against the
nameplate.
4. Tighten the memory stop screw.
SERVICE INSTRUCTIONS
Periodically inspect the Circuit Setter for signs of leakage or
corrosion.
INSULATION
If an optional insulation set is used, then Bell & Gossett recom-
mends that the insulation be attached to the Circuit Setter after
the system has been balanced. Tape or other acceptable
means should be used to secure the insulation to the Circuit
Setter Balance Valve.
HOW TO USE THE BELL & GOSSETT
CIRCUIT SETTERS TO PROPORTIONATELY
BALANCE A SYSTEM
1. Open to “A” position all “RF” Circuit Setters and all standard
Circuit Setters to the fully open position for single pump
systems.
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 on each Circuit Setter
Balance Valve.
3. Using side 2 of the Bell & Gossett Circuit Setter Balance
Valve Calculator, with the top hairline set on zero for the size
Circuit Setter being read, or the pressure drop curves sup-
plied in this manual for the “RF” models read the flow cor-
responding 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.
This Circuit Setter is left in the “A” position if “RF” model or
the full open position for standard Circuit Setters. Every
other Circuit Setter in the branch is then reset to the same
proportional flow.
6. If there are additional branches, repeat the steps in 3 and 4
for each branch.
7. After all branches have been proportionately balanced,
measure the full open flows on the Circuit Setter Balance
Valves 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 the same
ratio.
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.
IMPORTANT:
If a high degree of throttling of flow at pump discharge is
required, Bell & Gossett recommends that the impeller be
sized to produce design flow. This will reduce electrical
energy consumption.
B&G CIRCUIT SETTER
CORRECTION FACTORS FOR
VISCOSITY AND SPECIFIC GRAVITY
WARNING: Corrosion or leakage are indications that
the Circuit Setter may be damaged and must be
replaced. Failure to follow this instruction could result in
serious personal injury and/or property damage.
WARNING: Hot water leakage can occur from
readout valves 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 this instruction could result in serious per-
sonal injury and/or property damage.
VISCOSITY
CENTIPOISE 1 10 15 25 35 60 100 200 500
ø 1 .95 .90 .85 .80 .75 .70 .65 .60
S.G. S.G. ƒ
1 .60 .775 1.29 1.23 1.16 1.10 1.03 0.97 0.90 0.84 0.78
1 .65 .806 1.24 1.18 1.12 1.05 0.99 0.93 0.87 0.81 0.75
1 .70 .837 1.20 1.14 1.08 1.02 0.96 0.90 0.84 0.78 0.72
1 .75 .866 1.16 1.10 1.04 0.98 0.92 0.87 0.81 0.75 0.69
1 .80 .894 1.12 1.06 1.01 0.95 0.89 0.84 0.78 0.73 0.67
1 .85 .922 1.08 1.03 0.98 0.92 0.87 0.81 0.76 0.71 0.65
1 .90 .949 1.05 1.00 0.95 0.90 0.84 0.79 0.74 0.69 0.63
1 .95 .975 1.03 0.97 0.92 0.87 0.82 0.77 0.72 0.67 0.62
1.00 1.00 1.00 0.95 0.90 0.85 0.80 0.75 0.70 0.65 0.60
1.05 1.025 0.98 0.93 0.88 0.83 0.78 0.73 0.68 0.63 0.59
1.10 1.049 0.95 0.91 0.86 0.81 0.76 0.72 0.67 0.62 0.57
1.15 1.072 0.93 0.89 0.84 0.79 0.75 0.70 0.65 0.61 0.56
1.20 1.096 0.91 0.87 0.82 0.78 0.73 0.68 0.64 0.59 0.54
1.25 1.118 0.89 0.85 0.81 0.76 0.72 0.67 0.63 0.58 0.54
1.30 1.140 0.88 0.84 0.79 0.75 0.70 0.66 0.62 0.57 0.53
1.35 1.162 0.86 0.82 0.78 0.73 0.69 0.65 0.60 0.56 0.52
1.40 1.183 0.85 0.80 0.76 0.72 0.68 0.63 0.59 0.55 0.51