Instruction manual
13
The heaters thermostat can be regulated to
provide domestic hot water between 100°F
and 180°F. Water temperature over 125°F
can cause severe burns instantly. Since it is
required that the heater water temperature
reach above 140°F in order for the heating
system side of the unit to operate, it is
imperative that a mixing valve be installed
external of the heater to further regulate
the temperature of the domestic hot water
(See figures 23, 25, 26, 27 and 28). Failure
to install a domestic side mixing valve will
result in severe burns!
Piping and components connected to the
water heater for space heating shall be
suitable for use with potable water, and shall
not be connected to any heating system or
components previously used with a non-
potable water heating appliance.
The domestic hot water circuit needs an
ASME approved temperature and pressure
P-T relief valve, set at 150 psi and 210°F,
installed as close as possible to the heater.
There must be no valves between the P-T
relief valve and the heater. The P-T relief
valve discharge pipe must not be
restricted or plugged.
3.5 Water Hardness
In hard water areas (above 150 p.p.m), it is
recommended that a suitable water treatment
device (softener with filters) be installed.
Excessive buildup of minerals in the heat
exchanger can cause a non-warranty failure.
Water hardness can be determined by using
the standard test or by checking with your
local water authority.
Toxic chemicals, such as used for heater
treatment, should not be introduced into the
potable water used for space heating.
3.6 Gas Supply
Before making any gas connections, verify
that the heater is being supplied with same
gas type as indicated on the rating plate. The
rating plate is located on the front of the BMS,
and is located on the front door of the BTS.
This heater has orifices which will operate at
an altitude of up to 2,000 feet. For
installations in higher elevations, down-rate
the heater by 10%.
Install a manual gas cock outside of the
heater. Refer to Figures 1 and 3, item 3, for
the gas inlet location of the heater.
Gas piping to the heater must be sufficient
to guarantee a supply of gas to meet
maximum requirements. See Table 1 for
max. and min. values of gas pressure (Back
of manual).
All piping must comply with local codes
and ordinances or with the National Fuel
Gas Code, (ANSI Z223.1 NFPA No. 54),
whichever applies.
The appliance and its individual shutoff
valve must be disconnected from the gas
supply piping system during any pressure
testing of that system at test pressures
in excess of ½ psig, (3.5 kPa).
The appliance must be isolated from the
gas supply piping system by closing its
individual manual shutoff valve during any
pressure testing of the gas supply piping
system at test pressures equal to or less
than ½ psig, (3.5 kPa).