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SECTION 10.
Professional Maintenance, Service
and Diagnostic Trouble Shooting
WARNING
SERVICING SAFETY
Some of the servicing procedures for the Lite2
model LG pool heater are hazardous because
they involve fuel gas, moving parts and
procedures which require testing or temporary
bypass of safety controls. For this reason, the
heater must be serviced only by a qualified
professional service technician.
IMPROPER SERVICE HAZARD
The Lite2 model LG pool heater incorporates
unique design features. Incorrect service of this
heater can result in personal injury or damage
to property. To avoid such hazards, the heater
must be serviced only by a qualified
professional service technician.
10.1 General Information
A qualified professional technician must service
the Lite2 model LG pool heater using Water Pik
Technologies, Inc. service procedures. Before calling
for service, however, the owner should check for
obvious problems. The other components in the pool
system, including pump, filters and strainers, water
valves, gas supply and time clocks have an effect on
heater operation.
Confirm that the LG heater control switch is set
to 'ON' and that the temperature control knob is set
high enough to make the heater operate. Make sure the
pump is operating, that the filter and strainers are not
clogged, that there are no mis-positioned water valves,
that the gas is not shut off and that time clocks are
properly adjusted. Also be sure that there is no block-
age of the vent or louvers which supply combustion
air to the burners.
10.2 Natural-Draft Combustion System
The Lite2 model LG pool heater has an atmo-
spheric combustion system. This system is illustrated
in Figure 23.
As the heated exhaust gases rise out of the
combustion chamber, flow is created through the
system and fresh combustion air is drawn into the
heater through the louvers cut into the front and sides
of the heater. Gas is forced through an orifice into the
open end of a burner. When the gas flows into the
burner, a “negative” pressure is created at the opening
of the burner. This negative pressure pulls air into the
burner with the gas and mixes the two together. As the
gas/air mixture flow through the burner ports it is
ignited in the combustion chamber. Hot combustion
products then rise through a highly efficient heat
exchanger. Combustion products then enter a flue
collector and are directed to the outdoors through the
grate top of the heater or a vent pipe and cap.
10.3 Heater Components and Their
Operation
1. Gas Valve / Regulator - The gas valve controls
gas flow into the manifold. It provides flow only
when the temperature controls require heat and
only if all safety controls enable operation. It is
also a positive pressure regulator. It regulates
the gas pressure in the manifold to specifications
addressed earlier in this manual. This is neces-
sary for proper operation of the burner system.
2. LG Temperature Control- The Jandy LG
controller is an electronic control which senses
water temperature by means of a thermistor and
controls heater operation to bring the water to the
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