lp-65 Rev. 002 Rel. 010 Date 10.11.19
7
Figure 2 - Dimensions
G. Potable Expansion Tank
A potable hot water expansion tank may be required to oset heated
water expansion. If there is a back ow preventer or any other type
of no return or check valve in the system a thermal expansion tank IS
MANDATORY. The expansion tank must be sized for the entire water
volume of the hot water system. A weeping relief valve indicates the
need for an expansion tank. See the Typical Expansion Tank example
in the Piping section for details.
H. Pressure Drop Sizing For Circulator
The boiler circulator ow rate must meet the requirements found
in the pressure drop sizing chart. The chart represents the pipe run,
water heater, and heat exchanger ONLY and does not include any
ow checks, zone valves, or friction loss through the boiler. That
resistance must be added to the value found in the following chart.
Pressure Drop for Pipe Length of 1” Copper,
Six 90
o
Elbows, and One Tee
Model 20’ 30’ 40’ 50’ 60’
SSC-35 8 GPM 6.28 6.53 6.78 6.28 7.28
SSC-50 8 GPM 6.48 6.73 6.98 7.23 7.48
SSC-80 10 GPM 6.19 6.55 6.85 7.15 7.45
SSC-119 12 GPM 16.19 16.79 17.39 17.99 18.59
Table 4 - Pressure Drop through 1” and 1 1/4” Copper
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