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D. CIRCULATOR SIZING
The heat exchanger has a pressure drop that must be considered in your system design. Refer to the tables below for pressure drop.
FLOW (GPM)
4
6
8
10
12
14
16
FLOW (GPM)
6
9
12
15
18
21
24
27
30
33
36
39
Table 17 – Pressure Loss in Copper Pipes
Pressure Loss in Fittings and Valves Expressed as Equivalent Length of Tube, Feet
Nominal or
Standard Ell
Standard Size, In.
90
3/8
.5
½
1
5/8
1.5
¾
2
1
2.5
1 ¼
3
1 ½
4
2
5.5
2 ½
7
3
9
3 ½
9
4
12.5
5
16
6
19
8
29
Table 18 – Pressure Loss in Fittings and Valves, Feet
E. PRESSURE RELIEF VALVE
An external pressure relief valve must be installed on this appliance. When installing, observe the following guidelines. Failure to
comply with these guidelines can result in substantial property damage, personal injury, or death.
This appliance is provided with a CH pressure relief valve that complies with the ANSI/ASME Appliance and Pressure Vessel Code,
Section IV (Heating Appliances). The included 30 psi CH Pressure Relief Valve must be installed on the CH supply line to ensure a
compliant installation and safe operation. Westinghouse has supplied a ¾" X 1" bushing to aid installation of the CH Pressure Relief
Valve. The valve is meant to be field installed.
This appliance has a high-temperature shut-off switch built in as a standard safety feature. Therefore, a "pressure only" relief valve is
required. DO NOT operate this appliance before the supplied pressure relief valve is installed with sufficient relieving capacity in
accordance with the ASME rating plate on the appliance.
PRESSURE LOSS DUE TO FRICTION IN TYPE L COPPER PIPES
NOMINAL PIPE SIZE: 1 INCH
PRESSURE LOSS (PSI/FT)
0.005
0.011
0.019
0.028
0.040
0.053
0.068
NOMINAL PIPE SIZE: 1 ¼ INCH
PRESSURE LOSS (PSI/FT)
0.004
0.008
0.014
0.022
0.03
0.04
0.052
0.064
0.078
0.093
0.109
0.127
Fittings
o
o
45
Side Branch
-
1.5
.5
2
.5
2
.5
3
1
4.5
1
5.5
1.5
7
2
9
2.5
12
3.5
15
3.5
14
5
21
6
27
7
34
11
50
PRESSURE LOSS (HEAD FT)
0.01
0.025
0.044
0.064
0.092
0.122
0.157
PRESSURE LOSS (HEAD FT)
0.009
0.018
0.032
0.051
0.069
0.092
0.12
0.148
0.18
0.215
0.252
0.293
o
90
Tee
Coupling
Straight Run
-
-
-
-
-
.5
.5
.5
.5
1
1
1
1.5
2
3
VELOCITY (FT/SEC)
VELOCITY (FT/SEC)
Ball
Gate
-
-
-
-
-
-
-
-
-
-
-
-
-
.5
-
.5
.5
-
.5
.5
-
.5
.5
.5
.5
-
1
1
-
1.5
1
-
2
1
-
2
1.5
-
3
2
-
3.5
3
-
5
39
1.6
2.3
3.1
3.9
4.7
5.4
6.2
1.5
2.3
3.1
3.8
4.6
5.4
6.1
6.9
7.7
8.4
9.2
10
Valves
Btfly
Check
-
1.5
-
2
-
2.5
-
3
-
4.5
-
5.5
-
6.5
7.5
9
10
11.5
15.5
14.5
-
12.5
16
18.5
11.5
23.5
13.5
26.5
12.5
39
WHL-015 REV. 1.13.17
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