11
regulated to provide domestic hot
water between 100°F (38°C) and
176°F (80°C).
CAUTION!!!
Water
temperature over 125°F (52°C) can
cause severe burns instantly.
Since it is required that the heater
water temperature reach above 140°F
(60°C) 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 26,
27, 28, 30, 31, 32, 33, 36 and 36).
CAUTION!!!
Failure to install
a domestic side mixing valve will
result in severe burns!
CAUTION!!!
Piping and
components for domestic hot and
cold water, 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.
CAUTION!!!
The domestic
hot water circuit needs an ASME
approved pressure relief valve, set at
150 psi (10 bar), installed as close
as possible to the heater.
There must be no valves between the
relief valve and the heater. The relief
valve discharge pipe must not be
restricted or plugged (see figure 26)
3.17 - 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.
CAUTION!!!
Toxic
chemicals, such as those used for
heater treatment, should not come
into contact with the potable water
used for space heating.
3.18 - 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 panel of the
heater.
There are two possible situations:
A – the gas and the supply pressure
match the configuration of the heater.
In this case, it is possible to proceed
with connecting the heater;
B - the gas and supply pressure do
not match the configuration of the
water heater. In this case it is
necessary to convert the heater for
the type of gas and pressure of the
available supply.
The conversion kit is supplied
together with the water heater
- Install a manual gas cock outside
3 - INSTALLATION
of the heater. Refer to figure 4, 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 in chapter 8 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 psi,
(3.5 kPa).
- The appliance and its gas
connection must be leak tested
before placing the appliance in
operation.
- Before installation it is
recommended to perform a thorough
internal cleaning of the gas supply
line. Figure 4 shows the positioning
of the gas connection on the heater.
3.19 - Operating at
high altitudes
This heater has orifices which will
operate at an altitude of up to 2,000
feet (609 m). For installations in
higher elevations between 2,000 ft
and 4,500 ft, you must derate 10%
the heater. Up 4,500 ft follow the
local codes and the National Fuel
Gas Code. For Canada, you must
follow CAN1-2.17 standard.
