SSB 6720866942 (2018/06) US
Installation | 17
SSB800 SA
0
3
6
9
12
15
18
21
27
30
33
36
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
Max. pump speed
Head available
for the system
at 29.6GPM
(min. water flow
@ max. power
with ∆T 54°F /
30°C)
Head available
for the system
at 44.4GPM
(recommended
water flow @
max. power
with ∆T 36°F /
20°C)
∆ p/ Feet of Head
Fig. 15 SSB800 SA Pressure drop
Do not plug the relief valve.
75PSI Relief valve
Fig. 14 Pressure Relief Valve Location
4.4.5 Expansion tank
An expansion tank must be installed in the hydraulic system. The
expansion tank must be properly sized for the boiler and the system
volume, temperature and pressure.
WARNING: An undersized expansion tank will cause
leakage of water from the pressure relief valve and
introduce fresh water into the system. Excessive addition of
makeup water can cause corrosion of metallic components
and compromise the functionality of the boiler.
Refer to instructions provided by the manufacturer of the expansion tank
for details on its installation and sizing.
4.4.6 Pump
SSB800-1000 SA and 1000 TL are tted with a circulator pump on each
module. The graph in the following gure shows the head range of the
pump depending on the ow rate compared to the relevant pressure drop.
It is important to ensure the pump has the correct ow rate
for the system to avoid a low water circulation situation. In
event of an inadequate ow rate, the safety devices of the
boiler will automatically stop the burner.
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