Install Instructions

4 of 4
Product
Instructions
PI-PR-561142 0314 (Copper Manifold - Valved) (EN ES FR)
Viega LLC, 301 N. Main, 9th Floor • Wichita, KS 67202 • Ph: 800-976-9819 • Fax: [phone]
Circuit
Circuit
Length
Number of Turns Open to Set
Memory Spindle
1 250' 250/250 x 10 = 10 turns (fully open)
2 200' 200/250 x 10 = 8 turns
3 150' 150/250 x 10 = 6 turns
4 100' 100/250 x 10 = 4 turns
Example: 4 Circuit Manifold
Balancing Circuits
It is important to balance the circuits on the manifolds to ensure even distribution of the radiant heating. The uid
(water and glycol mix) ows in the path of least resistance. Longer circuit lengths causes higher pressure drops
(resistance). The shut-off / balancing valves can equalize the pressure drop (resistance) in every circuit. For proper
balancing see calculations and diagrams below.
Balancing
For balancing of manifolds follow steps and diagrams below:
Remove tamper
resistant cap
(counter clockwise)
Open memory spindle
of the
longest loop fully
(counter clockwise)
Close all other
memory spindles
fully (clockwise)
Turn the memory spindle
counter clockwise slowly to
achieve desired balance
(calculation above)
Re-install tamper
resistant cap
(clockwise)
3
Circuit 1 is the longest at 250', so it is fully open (counter clockwise). Circuit 2 is 200', so divide 200' by 250', which
equals 0.8. Then multiply 0.8 by 10, and the answer is 8. This represents the number of 360° turns open needed for
proper balancing (counter clockwise).
Note: Each 360° turn of the memory spindle restricts approximately 10% of ow.
# of Turns for
Balancing*
Circuit Length (ft)
Longest Circuit (ft)
=
X
* The number of full 360° turns open from a
fully closed position
10
5
4
2
1
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