HTP SSC-119 - Manual (Page 8)

8
LP-65 Rev. 3.24.14
Sodium: 20 mGL
PART 3 – HEATER PIPING
A. PLUMBING
It is mandatory that all plumbing be done in accordance with federal, local, and state plumbing codes and practices. Failure to properly
install the water heater WILL VOID the warranty. It is also necessary to use both thread tape and pipe dope on all mechanical plumbing
connections.
When filling the water heater, open a hot water tap to release air in the tank and piping. Failure to do so could lead to improper water
heater operation.
B. BOILER CONNECTIONS
Use two wrenches when tightening water piping at heater. Use one wrench to prevent the heater return or supply line from turning.
Failure to prevent piping connections from turning could cause damage to heater components.
Use a 1” nominal minimum pipe size when piping with zone valves or circulators.
On the water heater, the boiler supply connects to the outlet of the circulator. The circulator inlet is to be connected to t
he “HOT
OUTLET” side of the boiler. Be sure that the arrow on the circulator is facing the correct flow direction. (See pressure drop sizing for
circulator, this manual.) On the tank, the boiler return is to be connected to the return side of the boiler. The return(s) from heating
loop(s) should have a flow check or swing check valve installed before the return pipe from the tank.
In a steam boiler, the tank supply must be connected to the boiler well below the minimum water level. A strainer and drain valve should
be installed at the boiler for periodic draining of scale and sludge. Banging and steam bound traps will occur if the boiler water supplied
to the heat exchanger has steam or is slightly above the low water cut off.
The water heater heat exchanger cannot be used with non-barrier radiant pipe systems. Use with closed loop boiler systems only.
C. COLD WATER INLET
Use both thread tape and pipe dope to connect an NPT female x ¾” minimum pipe adapter.
Dielectric fittings must be used on water heater connections.
A shut off valve between the city water supply and tank inlet is recommended for ease of service.
Exercise caution when soldering water heater connections, as outlet and inlet dip tubes are plastic.
It may be recommended to use a back flow preventer
– check local codes. If a back flow preventer or a no return valve is used, a
thermal expansion tank must be installed on the cold water supply between the tank and valve. If the tank is replacing a tankless coil in
the boiler, disconnect coil plumbing and use the cold inlet pipe and hot water outlet pipes for the water heater.
NOTE: DO NOT PLUG OUTLET IN TANKLESS COIL.