4
The drain line from the relief valve must not be concealed or
blocked and must be protected from freezing.
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. INSTALLING THE REMOVABLE HEAT EXCHANGER
Heat exchanger is installed at the factory. The following is
provided for servicing or removing the heat exchanger.
Insert heat exchanger with plastic o-ring housing and align holes
in cover plate with holes in flange and plastic o-ring housing.
WARNING: Plastic o-ring housing
must be properly installed.
(See Figure 4). Failure to do this will void the warranty.
Insert and secure the bolts to the nuts one at a time in the
following manner:
Place the nut beneath the flange opening.
Hold the nut in place with one hand
– insert the bolt with the
other.
Thread the bolt into the nut and tighten in proper order. (See
Figure 4)
NOTE: Be sure to place bolts in all of the openings.
WARNING:
Plastic o-ring housing must be installed properly (See
Figure 4) to prevent corrosive action. Failure to do this will void the
warranty. Must use new o-ring if replaced or removed.
F. 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
Figures 1 and 2 for proper location, see Figure 3 for
S70DTPP)
All water supply fittings on this heater are brass
– do not over
tighten or strip threads.
It is recommended to use unions as per Figures 1 and 2. (See
Figure 3 for S70DTPP)
Do not apply heat directly to the cold-water inlet as it
includes a plastic dip tube which will melt.
