HTP SSC-119 - Manual (Page 10)

10
LP-65 Rev. 3.24.14
F. HOT WATER OUTLET
Use both thread tape and pipe dope to connect an NPT male x ¾” (minimum) pipe adapter. A shut off valve between the hot water
supply and tank outlet is recommended for ease of service at a later date. Use a backflow preventer specifically designed for water
heater installations. This valve should be installed on the cold water fill supply line per local codes.
Dielectric fittings must be used on water heater connections.
Due to the plastic dip tube in the cold water inlet, exercise extreme caution when soldering.
A temperature limiting or mixing valve is not entirely necessary, but recommended in installations servicing disabled or elderly persons,
or children. Take extreme caution to avoid scalding when temperature limiting or mixing valves are not used.
G. POTABLE EXPANSION TANK
A potable hot water expansion tank is required to offset heated water expansion. If there is a back flow preventer or any other type of
no return or check valve on 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 Typical Expansion Tank
installation, Fig. 3, for more details.
H. PRESSURE DROP SIZING FOR CIRCULATOR
Use the chart below to properly calculate circulator flow rate for the installation. The flow chart below represents the pipe run, water
heater, and heat exchanger ONLY and does not include any flow checks, zone valves, or friction loss through the boiler.
PRESSURE DROP FOR PIPE LENGTH OF 1” COPPER, AND FOR SIX 90 o
ELBOWS, AND ON TEE ON THE RUN
PIPE SIZE 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 3