8
❑ The drain line from the temperature and pressure relief valve must
not be concealed or blocked and must be protected from freezing.
❑ No valve of any kind should be installed between the temperature and
pressure relief valve and tank or in the drain line.
❑ WARNING: IF THE WATER SUPPLY IS FROM A WELL, OR
KNOWN TO HAVE HARD WATER, IT IS RECOMMENDED TO USE
A PRESSURE RELIEF VALVE IN THE COLD-WATER LINE AS
WELL AS A T&P VALVE IN THE HOT WATER LINE.
E. WATER SUPPLY CONNECTIONS
❑ WARNING: Some local codes mandate the use of a backflow
preventer or check valve or pressure-reducing valve. An
adequate expansion tank (or other adequate means) must be
installed to prevent pressure build up or damage from thermal
expansion when a check valve or backflow preventer or
pressure-reducing valve is used. Failure to do so could result in
tank leakage and therefore void the warranty. (See
INSTALLATION DIAGRAM 1 on page 20 and INSTALLATION
DIAGRAM 2 on page 20).
❑ All water supply fittings on this heater are brass – do not over tighten
or strip threads.
❑ Provide a shut off valve in the cold-water line. Mark for future emergency
use.
❑ It is recommended to use unions as shown in INSTALLATION
DIAGRAM 1 on page 20 and INSTALLATION DIAGRAM 2 on page
20.
❑ Do not apply heat directly to the inlet or outlet as it includes a
plastic dip tube and O-rings which can melt.
❑ Water connections are 3/4" male threaded fittings. Exception: They
are 1.5" male on the FD models.
F. BOILER SUPPLY CONNECTIONS
❑ WARNING: Heat exchanger fluid must be non-toxic.
❑ WARNING: Boiler temperature must be controlled by the boiler
hi limit not to exceed 200°F. Failure to do so will create a
hazardous installation and void the warranty.
❑ All fittings on this heater are brass – do not strip or cross threads.
❑ It is recommended to use unions as shown in INSTALLATION
DIAGRAM 1 on page 20 and INSTALLATION DIAGRAM 2 on page
20.
❑ Heat exchanger connections are 3/4" male threaded fittings.
Exception: They are 1" male on the FD models.
❑ Connect the supply line (from the boiler) to the “HX In” (heat
exchanger in) fitting of the heat exchanger.
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