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Chapter 3
DT=20°F
Model
No.
DP(PSIG)
1250
5.14
1450
5.82
1650
3.35
1850
3.71
2100
3.94
2500
4.50
NOTE: To avoid fireside condensation, return water temperature must be >140ºF.
! DANGER
In order to avoid damage to the equipment,
a circulating pump should be interlocked
with the burner so that the burner cannot
operate unless the circulating pump is run-
ning.
It is recommended that the system circulating pumps be kept
running, even though the heat users do not require hot water.
The relief device or bypass valve will allow continuous
circulation through the boiler and will help prevent rapid
replacement of boiler water with "cold" zone water.
! DANGER
The operator should determine that a circu-
lation of water exists through the boiler be-
fore initial firing or when firing after the unit
has been drained and refilled. A reduced cir-
culation of water or no water circulation
through the boiler when the burner is oper-
ating may result in damage to the equip-
ment.
3-2
Table 3-1:
Flow Rates and Pressure Drop for Hot Water Boilers
DT=40°F
GPM
GPM
DP(PSIG)
1005.00
1.28
503.00
1175.00
1.44
587.00
1340.00
0.83
670.00
1506.00
0.92
753.00
1675.00
0.98
838.00
2010.00
1.12
1005.00
CAUTION
CAUTION
DT=60°F
GPM
DP(PSIG)
DP(PSIG)
0.56
335.00
0.64
392.00
0.37
447.00
0.41
502.00
0.43
558.00
0.49
670.00
System Pressure
The design of the system and the usage requirements often
will dictate the pressure exerted upon the boiler. Some
systems are pressurized with nitrogen. Caution must be
Figure 3-2: Minimum system operating pressure
Pressure Vessel Care
DT=80°F
GPM
DP(PSIG)
0.31
251.00
0.20
0.36
294.00
0.23
0.21
335.00
0.13
0.23
337.00
0.14
0.24
419.00
0.15
0.28
502.00
0.18
DT=100°F
GPM
201.00
235.00
268.00
301.00
335.00
402.00
750-364
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