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If the unconfined space is within a building of tight construction
(building using the following construction: weather stripping, heavy
insulation, caulking, vapor barrier, etc.), air for combustion and
ventilation must be obtained from outdoors. The installation
instructions for confined spaces must be followed.
CONFINED SPACE
When drawing combustion air from inside a conventionally
constructed building to a confined space, such a space shall be
provided with two permanent openings. ONE WITHIN 12 INCHES
OF THE ENCLOSURE TOP AND ONE WITHIN 12 INCHES OF
THE ENCLOSURE BOTTOM. Each opening shall have a free
area of one square inch per 1000 Btu/hr of the total input of all
appliances in the enclosure, but not less than 100 square inches.
If the confined space is within a building of tight construction, air for
combustion and ventilation must be obtained from outdoors. When
directly communicating with the outdoors or communicating through
vertical ducts, two permanent openings, located in the above
manner, shall be provided. Each opening shall have a free area of
not less than one square inch per 4000 Btu/hr of the total input of
all appliances in the enclosure. If horizontal ducts are used, each
opening shall have a free area of not less than one square inch per
2000 Btu/hr of the total input of all appliances in the enclosure.
WATER CONNECTIONS
Refer to figure 1 for typical installation. A suitable pipe thread
sealant must be used to prevent leakage. Please note that the
side connection plugs are not factory installed. Plugs are supplied
in a kit with the water heater.
WATER (POTABLE) HEATING AND SPACE HEATING
1. All piping components connected to this unit for space heating
applications shall be suitable for use with potable water.
2. Toxic chemicals, such as those used for boiler treatment, shall
NEVER be introduced into this system.
3. This unit may NEVER be connected to any existing heating
system or component(s) previously used with a non-potable
water heating appliance.
4. When the system requires water for space heating at
temperatures higher than required for domestic water
purposes, a tempering valve must be installed. Please refer
to Fig. 2 for suggested piping arrangement.
FIGURE 2
CLOSED WATER SYSTEM
A closed system will exist if a back-flow preventer (check valve),
pressure reducing valve, or other similar device is installed in the
cold water line between the water heater and the street main (or
well). Excessive pressure may develop due to the thermal
expansion of heated water causing premature tank failure or
intermittent relief valve operation. This type of failure is not covered
by the limited warranty. An expansion tank may be necessary in
the cold water supply to alleviate this situation, see Fig. 1. Contact
the local plumbing authority.
If the temperature and pressure relief valve on the appliance
discharges periodically, this may be due to thermal expansion in
a closed water supply system. Contact the water supplier or local
plumbing inspector on how to correct situation. DO NOT PLUG
THE TEMPERATURE AND PRESSURE RELIEF VALVE.
GAS CONNECTIONS
The minimum gas supply pressure for input adjustment is 5.0"
W.C. for natural gas.
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER
THAN 14" WATER COLUMN SUPPLY PRESSURE. EXPOSURE
TO HIGHER GAS SUPPLY PRESSURE MAY CAUSE DAMAGE
TO THE CONTROL WHICH COULD RESULT IN FIRE OR
EXPLOSION.
If overpressure has occurred such as through
improper testing of gas lines or emergency malfunction of the
supply system, the control must be checked for safe operation.
Make sure that the outside vents on the supply regulators and
the safety vent valves are protected against blockage. These are
parts of the gas supply system not the heater. Vent blockage may
occur during ice storms.
IT IS IMPORTANT TO GUARD AGAINST CONTROL FOULING
FROM CONTAMINANTS IN THE GAS WAYS. SUCH FOULING
MAY CAUSE IMPROPER OPERATION, FIRE OR EXPLOSION.
All gas piping must comply with local codes and ordinances or
with the National Fuel Gas Code (ANSI Z223.1 / NFPA-54)
whichever applies.