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INSTALLATION
1. Follow all local codes, or in the absence of local codes, follow the current edition of the National
Fuel Gas Code: ANSI Z223.1/NFPA 54 in the USA or B149.1 Natural Gas, Propane Installation Code in
Canada.
2. All gas water heaters require careful and correct installation to ensure safe and efficient operation.
This manual must be followed exactly. Read the "Safety Guidelines" section.
3. The manifold gas pressure is preset at the factory. It is computer controlled and should not need
adjustment.
4. Maintain proper space for servicing. Install the water heater so that it can be connected or removed
easily. Refer to the "Clearances" section on p. 9 for proper clearances.
5. The water heater must be installed in a location where the proper amount of combustible air will be
available to it at all times without obstructions, or the indoor heater may be direct vented.
6. Electrical service to the water heater requires a means of disconnection. This will allow power to the
water heater to be shut off for servicing and safety purposes.
7. Do not install the unit where the exhaust vent is pointing into any opening in a building or where the
noise may disturb your neighbors. Make sure the vent termination meets the required clearance from
any doorway or opening to prevent exhaust from entering a building. (Refer to pp. 11, 25 and 26.)
Check local code requirements prior to installation.
8. Carefully plan the installation location of the heater and vent terminations. Contaminants such as
aerosols, lint, and fine powders (including flour) can clog the air intake and reduce the operation of the
fan. This, in turn, can cause improper combustion and reduce the life of the water heater. Regularly
ensure that the area around the water heater, vent termination, and air intake is free of dust, debris,
and other contaminants. In environments with a high level of contaminants (laundry facilities, hair
salons, pet salons, chemical plants, commercial kitchens, etc.), direct venting is required.
9. The 140 Indoor model is to be installed indoors only. The model is equipped with a thermistor and
hi-limit switch for the exhaust gas, detecting excess temperatures within the flue and enabling the
water heater to safely stop operation if needed. These components are always monitoring exhaust gas
conditions in order to prevent heat damage to ABS, PVC (solid core), CPVC (solid core), or Polypropylene
(Plastic) venting if ABS, PVC, CPVC, or Polypropylene is used. If the exhaust gas temperature exceeds
140 °F (60 °C) these components will enable the water heater to safely stop operation. (These
components are not installed on the outdoor model since the exhaust vent is built-in.)
• If the water heater is used as a direct-vent appliance, the unit requires 3 in (76 mm) or 4 in (102
mm) combustion air supply pipe. The intake pipe must be sealed airtight. Refer to pp. 13 to 27
for more detail.
• Air supply pipe can be made of aluminum flexible tube, ABS, PVC (solid core), CPVC (solid core),
Polypropylene, corrugated stainless steel, or Category lll / IV stainless steel. Regarding exhaust
pipe, please refer to pp.18 to 24 for detailed information.
• Use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel® (polyphenylsulfone) in non-
metallic venting systems is prohibited. Covering non-metallic vent pipe and fittings with thermal
insulation is prohibited.
• Terminating the venting through a sidewall is recommended for the direct-vent system.
Terminating in the same pressure zone allows for pressure balancing, which prevents nuisance
shutdowns.
• Only install the water heater in a heated area where below freezing temperatures cannot occur. The
warranty does not cover damage caused by freezing.
• The manufacturer recommends running the exhaust vent and the intake pipe as parallel as possible.
• The water heater must be securely mounted to a wall or other suitable structure.
10. The 140 Outdoor model must only be installed outdoors and only in the area with mild, temperate
climates. The Outdoor model shall be wall-mounted or mounted on a stand. Locate the Outdoor
model in an open, unroofed area and maintain the minimum clearances. (Refer to pp.9 and 11.)
GENERAL
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Installation Manual
Installation
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