Catalogue

WSHP-PRC025D-EN 7
Features and Benefits
(1) Optional electronic isolation valve for variable water volume control.
(1) OptionalY-ball strainer with brass cap and stainless steel mesh screen (includes blow down
valve and hose connector).
Note: Pressure drop information can be derived from the formula below:
Circuit Setter Flow Control
Another choice in manual fluid flow balancing of a water-source heat pump includes a Hays
Measurmeter circuit setter flow control option.This manual balancing method uses an in-line flow
measurement device and an adjustment feature to measure and set flow rates at each heat pump.
Advantages
• In-line flow measurement device
• Easier to use than traditional or differential pressure/differential temperature methods
Disadvantages
• Flow accuracy of ±20%
• Higher pressure drop of circuit setters result in additional pumping energy costs (a 3/4-inch
circuit setter with 8-GPM flowing has 15-feet of pressure drop)
• Direct readout of flow rate is not possible with a circuit setter
• Each unit must be balanced multiple times because of changing system conditions in balancing
other equipment
Circuit Setter flow control hose kit is equipped with:
(2) Stainless Steel braided hoses with brass end fittings containing fiber washers.
(1) Bronze manual valve (supply) with brass ball with option P/T port on return side.
Table 1. Ball valve Cv factors
1/2" 3/4" 1" 1 1/4"
90-Degree (open) 15 30 43 48
80-Degree 9.3 17 28 54
70-Degree 5.0 9.0 16 31
60-Degree 2.9 5.1 9.2 20
50-Degree 1.8 2.9 5.8 12
40-Degree 1.0 1.5 3.1 6.3
30-Degree 0.4 0.7 1.6 3.2
20-Degree 0.1 0.1 0.4 0.8
10-Degree 0 0 0 0
0-Degree (closed) 0 0 0 0
Table 2. Strainer Cv factors
Strainer Size Cv
1/2” 5.1
3/4” 15
1” 27
1-1/4” 50
DP:=Q
2
Sp
Q = flow in GPM
Cv
2
Sp = specific gravity
DP = pressure drop in PSI
Cv = flow coefficient