5
THE HEATER SHOULD BE LOCATED IN AN AREA WHERE
LEAKAGE OF THE TANK OR CONNECTIONS WILL NOT
RESULT IN DAMAGE TO THE AREA ADJACENT TO THE
HEATER OR TO LOWER FLOORS OF THE STRUCTURE.
When
such locations cannot be avoided, a suitable drain pan should be
installed under the heater, see fig. 1. The pan should have a
minimum length and width of at least 2 inches greater than the
diameter of the heater and should be piped to an adequate drain.
Drain pans suitable for these heaters are available from your
dealer or A.O. Smith Water Products Company, Product Service
Division, 5621 W. 115th Street, Alsip, IL 60803, 1-800-433-2545.
WARNING
DO NOT INSTALL THIS WATER HEATER DIRECTLY ON A
CARPETED FLOOR. A FIRE HAZARD MAY RESULT.
Instead
the water heater must be placed on a metal or wood panel
extending beyond the full width and depth by at least 3 inches
(76.2mm) in any direction. If the heater is installed in a carpeted
alcove or closet, the entire floor shall be covered by the panel.
Also, see DRAINING.
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
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-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 the situation.
Do not plug
the temperature and pressure relief valve.
GAS CONNECTIONS
The minimum gas supply pressure is 5.0" W.C for natural gas
(11.0" W.C. for propane).
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER
THAN 14.0'' 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 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
recommendations of serving gas supplier. Refer to the latest
edition of National Fuel Gas Code, ANSI Z223.1.
To prevent damage, care must be taken not to apply too much
torque when attaching gas supply pipe to gas valve inlet. The
thermostat inlet has a pad for use with back up wrench.
Apply joint compounds (pipe dope) sparingly and only to the male
threads of pipe joints. Do not apply compound to the first two
threads. Use compounds resistant to the action of liquefied
petroleum gases. Do not use teflon tape on gas valve fittings.
DISCONNECT THE APPLIANCE AND ITS INDIVIDUAL SHUT
OFF VALVE FROM THE GAS SUPPLY PIPING SYSTEM DURING
ANY SUPPLY PRESSURE TESTING EXCEEDING 1/2 PSI (3.5
kPa). GAS SUPPLY LINE MUST BE CAPPED WHEN
DISCONNECTED FROM THE HEATER. FOR TEST
PRESSURES AT 1/2 PSI (3.5 kPa) OR LESS, THE APPLIANCE
NEED NOT BE DISCONNECTED, BUT MUST BE ISOLATED
FROM THE SUPPLY PRESSURE TEST BY CLOSING THE MAIN
MANUAL GAS VALVE.
