Use And Care Manual

Using the balancing valves with flow meter
Determine the design flow requirement for each circuit based on the heating requirement.
The balancing valves in the flow manifold make it possible to adjust each individual circuit in the panels to obtain the design flow rates in each loop.
Considering the following data:
- medium flow rate across each circuit
- head loss generated in each circuit by this flow rate: Δ P
Circuit
= Δ P
Loop
+ Δ P
SV
( Δ P
Shut-off valve
)
- available head on the panel circuit or predefined head:
H
Predefined
≥ Δ P
Circuit with
= Δ P
BV
+ Δ P
Loop
+ Δ P
SV
greatest pressure loss
Referring to the diagram alongside, for the loop flow rate the balancing valve must provide an additional head loss equal to the difference Δ P
BV
( Δ P
Balancing valve
).
Flow rate adjustment and reading
To balance the circuits start by setting all balancing valves to their wide open positions. Then set the circuit with the greatest flow requirement
to its design flow rate (gpm). Adjust the other circuits, reducing to each circuit design flow rate from greatest to least.
Raise the block cover with the aid of a screwdriver and turn it over onto the flow meter. Adjust the flow rate of the single circuits by turning the
flow meter body acting on the built-in balancing valve.
The flow rate must be read off the graduated scale, expressed in gpm, printed on the flow meter.
After making all the adjustments, reposition and lock all the knobs in their seat to prevent tampering.
HPredetermined ≥ ΔPCircuit
with greatest
pressure loss
ΔP
BV
ΔPCircuit
ΔP
Tot
SV
BV
37288_CNA6:37288_CNA6 8/6/08 8:40 AM Page 6