Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS - Manual (Page 47)

Installation and Service Manual
47
High Water Temperature Limit Control
This pool heater is equipped with a fixed setting, auto reset
high water temperature limit control that is screwed into the
outlet head in the heat exchanger. This temperature limit
control has a maximum limit setting of 200°F (93°C). It is also
equipped with an adjustable setting, manual reset high water
temperature limit control. This temperature limit control has a
maximum limit setting of 230°F (110°C). If water temperature
exceeds the set point, the limits will break the control circuit
and shut down the pool heater. The auto reset limit control will
only be reset after the water temperature has cooled below the
set point of the limit. The manual reset limit control will
require an operator to push the reset button (located
immediately below the high limit dial) if this limit has tripped.
CLEANING AND
MAINTENANCE
Listed below are items that must be checked to ensure safe
reliable operations. Verify proper operation after servicing.
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CAUTION: Label all wires prior to
disconnection when servicing controls. Wiring
errors can cause improper and dangerous
operation.
Appliance Area
Keep appliance area clear and free from combustible materials,
gasoline and other flammable vapors and liquids.
Water Circulating Pump
Inspect the pump every six months and oil as necessary.
Use SAE 30 non-detergent oil or lubricant specified by the
pump manufacturer.
Burner Flames
Visually check the main burner flames at each start up after
long shutdown periods or at least every six months. Burner
view ports are located on the right and left sides of the pool
heater.
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WARNING: The areas around the burner
view ports are hot. Direct contact with the pool
heater could result in burns.
Figure 51 - Flame Pattern Illustration
Normal Flame: A normal flame is blue with slight yellow tips,
has a well-defined inner cone, and displays no lifting flames.
Yellow Tips: The usual causes for yellow tips on the burner
flame are burner air flow blockage or partial obstruction.
Yellow Flames: The usual causes for yellow flames are
primary air flow blockage to the burner(s) or excessive gas
input. Correct this condition immediately.
Lifting Flames: The usual causes for lifting flames are over
firing the burner(s), excessive primary air, or high draft.
If you observe improper flame patterns, examine the venting
system, ensure proper gas supply, and ensure adequate supply
of combustion and ventilation air.
Flue Gas Passageways Cleaning
Procedures
Any sign of soot around the refractory, at the burners or in the
areas between the fins on the copper heat exchanger indicates
a need for cleaning. The following cleaning procedures must
only be performed by a qualified serviceman or installer.
Proper service is required to maintain safe operation. Properly
installed and adjusted pool heaters seldom need flue cleaning.
IMPORTANT: All gaskets on disassembled
components must be replaced with new gaskets
on reassembly. Gasket kits are available from
your distributor.
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WARNING: Should overheating occur or the
gas supply fail to shut off, do not turn off or
disconnect the electrical supply to the pump.
Instead, shut off the gas supply at a location
external to the pool heater.