Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS - Manual (Page 35)

Installation and Service Manual
35
Relief Valve
This pool heater is supplied with a relief valve(s) sized in
accordance with ASME Boiler and Pressure Vessel Code,
Section IV. The relief valve(s) is installed in the vertical
position and mounted in the hot water outlet. Place no other
valve between the relief valve and the pool heater. To prevent
water damage, pipe the discharge from the relief valve to a
suitable floor drain for disposal when relief occurs. Do not
install any reducing couplings or other restrictions in the
discharge line. The discharge line will allow complete drainage
of the valve and line. Manually operate the relief valves at least
once a year.
Automatic Chlorinator and
Chemical Feeders
All chemicals must be diluted into the pool water being
circulated through the pool heater. Any concentration of
chlorine in the pool heater can cause damage to the pool heater.
Do not place chlorine tablets or bromine sticks in the skimmer.
High chemical concentrations will result when the pump is not
running.
Chlorinator must feed downstream of the pool heater and
have an anti-siphoning device to prevent chemical back-up in
the pool heater when the pump is shut off.
Water Flow Switch
A water flow switch is standard equipment. The wiring
connection installs the flow switch in the 24 VAC safety circuit
to prove water flow before main burner ignition. The standard
flow switch is installed in the outlet side of the piping loop
when shipped from the factory. These pool heaters require a
sufficient flow of 26 GPM to make the flow switch and start
burner operation.
IMPORTANT: High chemical concentrations from
improperly adjusted feeders and Chlorinator can
cause rapid corrosion to the heat exchanger. This
damage is non-warrantable.
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CAUTION: Avoid contact with hot discharge
water.
Figure 38 - Multi-Stack Frame - Heaters are Beyond 15 feet from Pool Piping