I n s t a l l a t i o n , O p e r a t i o n , M a i n t e n a n c e
15
JE-Series
I s s u e D a t e :
M a y 1 0 , 2 0 2 1
T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y
Variable Water Flow Heat Pump Applications Overview, Cont’d.
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
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 7 in this manual will determine the flow
rate through the unit.
Modulating Valves for Closed Loop Applications,
Low System Pressure Drop
Model
CV
Close
Off
MOPD
WPD Adders
GPM
PSI
FT
026
4.7
200
30
3
0.41
0.94
4.7
200
30
4.5
0.92
2.12
4.7
200
30
6
1.63
3.76
038
7.4
200
30
4.5
0.37
0.85
7.4
200
30
6.8
0.84
1.95
7.4
200
30
9
1.48
3.42
049
10
200
30
6
0.36
0.83
10
200
30
9
0.81
1.87
10
200
30
12
1.44
3.33
064
19
200
30
7.5
0.16
0.36
19
200
30
11.3
0.35
0.82
19
200
30
15
0.62
1.44
072
19
200
30
8.5
0.20
0.46
19
200
30
12.8
0.45
1.05
19
200
30
17
0.80
1.85
Modulating Valves for Open Loop Applications,
High System Pressure Drop
Model
CV
Close
Off
MOPD
WPD Adders
GPM
PSI
FT
026
4.7
200
30
3
0.41
0.94
4.7
200
30
4.5
0.92
2.12
4.7
200
30
6
1.63
3.76
038
4.7
200
30
4.5
0.92
2.12
4.7
200
30
6.8
2.09
4.84
4.7
200
30
9
3.67
8.47
049
4.7
200
30
6
1.63
3.76
4.7
200
30
9
3.67
8.47
4.7
200
30
12
6.52
15.06
064
7.4
200
30
7.5
1.03
2.37
7.4
200
30
11.3
2.33
5.39
7.4
200
30
15
4.11
9.49
072
7.4
200
30
8.5
1.32
3.05
7.4
200
30
12.8
2.99
6.91
7.4
200
30
17
5.28
12.19
Standard Head Variable Pump Performance
0
5
10
15
20
25
30
35
0
5
10
15
20
Head (ft.)
Flow Rate (gpm)
No Check
Valve
With Check
Valve
