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20°F T
Model
No.
gpm
P (ft)
503
44
2.8
753
65
6.4
1003
87
12.0
1253
109
20.9
1503
N/A
N/A
1753
N/A
N/A
2003
N/A
N/A
Notes: Basis for minimum flow is ∆T . Basis for maximum flow is gpm.
Piping
All high points should be vented. A heater installed
above radiation level must be provided with a low wa-
ter cut-off device (sales order option F-10). This
heater, when used in connection with a refrigeration
system, must be installed so that the chilled medium is
piped in parallel with the heater with appropriate
valves to pre-vent the chilled medium from entering
the heater.
The piping system of a hot water heater connected to
heating coils located in air handling units where they
may be exposed to circulating refrigerated air, must be
equipped with flow control valves or other automatic
means to prevent gravity circulation of the heater
water during the cooling cycle. It is highly recommend-
ed that the piping be insulated.
Air-Separation/Expansion Tank
All heaters should be equipped with a properly sized
expansion tank and air separator fitting as shown in
Fig. 11.
Fig. 11: Air-Separation/Expansion Tank
30°F T
40°F T
gpm
gpm
P (ft)
29
1.4
N/A
44
3.1
33
58
6.0
43
73
10.2
54
87
16.0
65
102
22.5
76
116
32.0
87
Table F: Heater Rates of Flow and Pressure Drops
Min. Flow
gpm
P (ft)
P (ft)
N/A
25
1.1
1.9
33
1.9
3.7
43
3.7
6.2
54
6.2
9.5
65
9.5
13.4
76
13.4
18.9
87
18.9
*Maximum 4 times the pipe diameter or 12", whichever is less.
Fig. 12: Single Heater - Low-Temperature (Heat Pump)
Application with Primary/Secondary Piping
*Maximum 4 times the pipe diameter or 12", whichever is less.
Fig. 13: Dual Heaters (Reverse/Return)
with Primary/Secondary Piping
15
Max. Flow
gpm
T
P (ft)
35
100
11.3
40
100
13.8
13
40
113
18.6
15
40
113
22.2
19
40
113
25.5
23
40
113
27.2
27
40
116
32.0
30
THERMOSTAT OR
SYSTEM SENSOR
*
THERMOSTAT OR
SYSTEM SENSOR
*
T
9
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