User Guide

6
WATER CONNECTIONS
Refer to gure 1 for typical installation. A suitable pipe thread
sealant must be used to prevent leakage.\
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 Figure 2
for suggested piping arrangement.
FIGURE 2
CLOSED WATER SYSTEM
A closed system will exist if a back-ow 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
Figure 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" (12.7
cm) W.C. for natural gas (11.0" (27.9 cm) W.C. for propane).
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER
THAN 14" (35.6 cm) 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
of screens, louvers and grills should be considered. Screens shall
not be of a mesh smaller than 1/4" (6.3 mm) square. If the free
area is not known, the National Fuel Gas Code, ANSI Z223.1/NFPA
54 or the Natural Gas and Propane Installation Code CAN/CSA
B149.1 recommends using gures of 20-25 percent free area for
wood louvers or 60-75 percent for metal grills or louvers.
UNCONFINED SPACE
In buildings of conventional frame, brick or stone construction,
unconned spaces may provide adequate air for combustion,
ventilation, and dilution air for power venter.
If the unconned 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 venter dilution must be obtained from outdoors. The
installation instructions for conned spaces must be followed.
CONFINED SPACE
When drawing combustion and dilution air from inside a conventionally
constructed building to a conned space, such a space shall be provided
with two permanent openings. ONE WITHIN 12" (30 cm) OF THE
ENCLOSURE TOP AND ONE WITHIN 12" (30 cm) OF THE ENCLOSURE
BOTTOM. Each opening shall have a free area of one square inch (6.5 cm²)
per 1000 Btuh (292.8 W) of the total input of all appliances in the enclosure,
but not less than 100 square inches (645 cm²).
If the conned space is within a building of tight construction, air for
combustion, ventilation and power venter 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 (6.5 cm²) per 4000
Btuh (1,171 W) 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 (6.5 cm²) per 2000 Btuh (585.6 W)
of the total input of all appliances in the enclosure.