Install Instructions

IOM - HZH/HZV Series
15
Water Pressure Schrader Ports
The pressure ports built in to the unit are provided as a
means of measuring pressure drop through the water-to-
refrigerant heat exchanger. The water pressure ports are
schrader ports smaller than refrigerant schrader ports.
They are the same size as tire schrader ports. A digital
pressure gauge is recommended for taking pressure
vFlow™ Heat Pump Applications Overview - Continued
readings through these ports. The water flow through
the unit can be determined by measuring the water
pressure at the “water pressure out” port and subtracting
it from the water pressure at the “water pressure in” port.
Comparing the pressure differential to the pressure drop
shown in table 10 in this manual will determine the flow
rate through the unit.
Modulating Valves for Closed Loop Applications,
Low System Pressure Drop
Model CV MOPD
WPD Adders
GPM PSI FT
024
4.7 200 3 0.41 0.94
4.7 200 4.5 0.92 2.12
4.7 200 6 1.63 3.76
036
7.4 200 4.5 0.37 0.85
7.4 200 6.8 0.84 1.95
7.4 200 9 1.48 3.42
048
10 200 6 0.36 0.83
10 200 9 0.81 1.87
10 200 12 1.44 3.33
060
19 200 7.5 0.16 0.36
19 200 11.3 0.35 0.82
19 200 15 0.62 1.44
070
19 200 8.5 0.20 0.46
19 200 12.8 0.45 1.05
19 200 17 0.80 1.85
Modulating Valves for Open Loop Applications,
High System Pressure Drop
Model CV MOPD
WPD Adders
GPM PSI FT
024
4.7 200 3 0.41 0.94
4.7 200 4.5 0.92 2.12
4.7 200 6 1.63 3.76
036
4.7 200 4.5 0.92 2.12
4.7 200 6.8 2.09 4.84
4.7 200 9 3.67 8.47
048
4.7 200 6 1.63 3.76
4.7 200 9 3.67 8.47
4.7 200 12 6.52 15.06
060
7.4 200 7.5 1.03 2.37
7.4 200 11.3 2.33 5.39
7.4 200 15 4.11 9.49
070
7.4 200 8.5 1.32 3.05
7.4 200 12.8 2.99 6.91
7.4 200 17 5.28 12.19
Standard Head Variable Pump with Check Valve
30
25
20
15
10
5
0
0 5 10 15 20
Head (feet)
GPM