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INSTALLATION
GENERAL
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 unit 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.
The electrical connection requires a means of disconnection, to terminate power to the water heater 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 distance by local code
from any doorway or opening to prevent exhaust from entering a building. (Refer to pp. 11, 28, and 29.)
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 540P Indoor is to be installed indoors only. This water heater is equipped with a thermistor and hi-limit
switch for the exhaust gas, detecting excess temperatures within the flue and enabling the appliance
to safely stop operation if needed. These components are always monitoring exhaust gas conditions in
order to prevent heat damage to ABS, PVC, CPVC, or polypropylene (Plastic) venting. If the exhaust gas
temperature exceeds 140 °F (60 °C), these components will enable the appliance 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 30 for more detail.
•
Terminating the venting through a sidewall is recommended for the direct-vent system.
•
Running the exhaust vent and the intake pipe parallel is recommended.
•
Terminating the exhaust and intake on the same wall/surface is recommended. 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 water heater must be securely mounted to a wall or other suitable structure.
10.
The 540P Outdoor model is only to 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.)
INCORPORATED RECIRCULATION PUMP
This heater incorporates a recirculation pump for homes with an installed circulation system. The pump
provides several useful features:
•
The built-in controller and the remote controller (100276687/TM-RE43) offer two timer settings for pump
operation: PUMP TIMER 1 and PUMP TIMER 2. The pump will operate during the times set for TIMER 1
and/or TIMER 2.
•
The pump automatically turns on and off during set times depending on the set temperatures for pump
operation. The set point temperature can be set by the built-in controller or the remote controller
(100276687/TM-RE43).
•
Instead of the timers, the pump can operate by pressing the PUMP button on the built-in controller or the
remote controller (100276687/TM-RE43). A DIP switch must be turned on to use this control. (Refer to p. 57.)
The maximum pipe length* for the combined hot water supply line and return line is:
•
1/2” (13 mm) pipe: 200 ft (61.0 m)
•
3/4” (19 mm) pipe: 500 ft (152.4 m)
*These are equivalent length that includes head loss for elbows, tees, unions, etc.
Installation
Installation Manual
