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valve must be marked with maximum set pressure not to exceed the marked maximum allowable
working pressure of the water heater (150psi). Install the valve into the opening provided and
marked for this purpose in the water heater, and orient it or provide the tubing so that any discharge
from the valve will exit only within 6 inches above, or at any distance below the structural floor and
cannot contact any live electrical parts. The discharge opening must not be blocked or reduced in
size under any circumstances.
q CAUTION: A relief valve is designed to discharge excessively hot water. THE CUSTOMER IS
RESPONSIBLE TO PROTECT PROPERTY AND PERSONNEL FROM HARM WHEN THE VALVE
FUNCTIONS.
q Install the T&P provided on hot water outlet of tank as shown in Figures 1 and 2.
q Care must be taken to be sure that the stem of the pressure-and-temperature relief valve is
immersed in the water within the top 6 inches of the tank.
q The drain line from the relief valve must not be concealed or blocked and must be protected from
freezing.
q WARNING: IF THE WATER SUPPLY IS FROM A WELL, OR KNOWN TO HAVE HARD WATER, IT
IS RECOMMENDED TO USE A PRESSURE RELIEF VALVE IN THE COLD WATER LINE AS
WELL AS A T&P VALVE IN THE HOT WATER LINE.
E. INSTALLING THE REMOVABLE HEAT EXCHANGER
q Heat exchanger is installed at the factory except for the AL119SL which is shipped loose. The
following is provided for servicing or removing the heat exchanger.
q Insert heat exchanger with plastic o-ring housing and align holes in cover plate with holes in flange
and plastic o-ring housing.
q WARNING: Plastic o-ring housing must be properly installed. (See Figure 3). Failure to do
this will void the warranty.
• Insert and secure the bolts to the nuts one at a time in the following manner:
• Place the nut beneath the flange opening.
• Hold the nut in place with one hand – insert the bolt with the other.
• Thread the bolt into the nut and tighten in proper order.
NOTE: Be sure to place bolts in all of the openings.
q Heat exchanger connections are 3/4" male threaded fittings, except for the AL119SL which has 1
inch male threaded fittings.
q Connect the supply line (from the boiler) to the "Hx In" fittings of the heat exchanger. It is recom-
mended to use a union as per Figures 1 and 2.
q Connect the return line (back to the boiler) to the "Hx Out" fittings on the flange of the heat
exchanger. It is recommended to use a union as per Figures 1 and 2.
WARNING: Plastic o-ring housing must be installed properly (See Figure 3) to prevent corrosive
action. Failure to do this will void the warranty. Must use new o-ring if replaced or removed.
F. WATER SUPPLY CONNECTIONS
q WARNING: Some local codes mandate the use of a backflow preventer or check valve or
pressure-reducing valve. An adequate expansion tank (or other adequate means) must be
installed to prevent pressure build up or damage from thermal expansion when a check valve
or backflow preventer or pressure-reducing valve is used. Failure to do so could result in
tank leakage and therefore void the warranty. (See Figures 1 and 2 for proper location)
q All water supply fittings on this heater are brass – do not over tighten or strip threads.
q It is recommended to use a union as per Figures 1 and 2.
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