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5
UNCONFINED SPACE
In buildings of conventional frame, brick or stone construction,
unconfined spaces may provide adequate air for combustion,
ventilation, and draft hood dilution.
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, ventilation, and draft hood dilution must be obtained
from outdoors. The installation instructions for confined spaces
must be followed.
CONFINED SPACE
When drawing combustion and dilution air from inside a
conventionally constructed building to a confined space, such a
space shall be provided with two permanent openings. ONE IN
OR WITHIN 12 INCHES OF THE ENCLOSURE TOP AND ONE
IN OR WITHIN 12 INCHES OF THE ENCLOSURE BOTTOM.
Each opening shall have a free area of at least one square inch
per 1000 Btuh 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, ventilation and draft hood dilution 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 Btuh 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
Btuh of the total input of all appliances in the enclosure.
In calculating the free area of a vent opening, the blocking effect
of screens, louvers and grills should be considered. Screens
shall not be of a mesh smaller than 1/4 inch square. If the free
area is not known, the latest edition of National Fuel Gas Code
ANSI Z223.1 recommends using figures of 20-25 percent free
area for wood louvers or 60-75 percent for metal grills or
louvers.
WATER CONNECTIONS
Refer to figure 1 for typical installation. A suitable pipe thread
sealant must be used to prevent leakage.
WATER (POTABLE) HEATING AND SPACE HEATING
For WATER HEATING (POTABLE) 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 this 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 (11.0" W.C. for propane).
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER
THAN 10.5"-NATURAL, 13.0"-PROPANE WATER COLUMN (1/2
POUND PER SQUARE INCH [3.5 kPa]) 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 piping must comply with local codes and ordinances or with
the National Fuel Gas Code (ANSI Z223.1/NFPA-54) whichever
applies. Copper and brass tubing and fittings (except tin lined
copper tubing) shall not be used.
REFER TO FIG. 1 FOR CONNECTION DETAILS. BEFORE
ATTACHING THE GAS LINE BE SURE THAT ALL GAS PIPE IS
CLEAN ON THE INSIDE.
TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS
SUPPLY LINE, A DIRT LEG (SOMETIMES CALLED DRIP LEG)
MUST BE INCORPORATED IN THE PIPING, FIG. 1. The dirt leg
must be readily accessible. Install in accordance with