Jandy LG125 Installation And Operation Manual

Jandy LG125 Installation And Operation Manual Manual pdf 30 page image

Page 28SECTION 10.Professional Maintenance, Serviceand Diagnostic Trouble ShootingWARNINGSERVICING SAFETYSome of the servicing procedures for the Lite2model LG pool heater are hazardous becausethey involve fuel gas, moving parts andprocedures which require testing or temporarybypass of safety controls. For this reason, theheater must be serviced only by a qualifiedprofessional service technician.IMPROPER SERVICE HAZARDThe Lite2 model LG pool heater incorporatesunique design features. Incorrect service of thisheater can result in personal injury or damageto property. To avoid such hazards, the heatermust be serviced only by a qualifiedprofessional service technician.10.1 General InformationA qualified professional technician must servicethe Lite2 model LG pool heater using Water PikTechnologies, Inc. service procedures. Before callingfor service, however, the owner should check forobvious problems. The other components in the poolsystem, including pump, filters and strainers, watervalves, gas supply and time clocks have an effect onheater operation.Confirm that the LG heater control switch is setto 'ON' and that the temperature control knob is sethigh enough to make the heater operate. Make sure thepump is operating, that the filter and strainers are notclogged, that there are no mis-positioned water valves,that the gas is not shut off and that time clocks areproperly adjusted. Also be sure that there is no block-age of the vent or louvers which supply combustionair to the burners.10.2 Natural-Draft Combustion SystemThe Lite2 model LG pool heater has an atmo-spheric combustion system. This system is illustratedin Figure 23.As the heated exhaust gases rise out of thecombustion chamber, flow is created through thesystem and fresh combustion air is drawn into theheater through the louvers cut into the front and sidesof the heater. Gas is forced through an orifice into theopen end of a burner. When the gas flows into theburner, a “negative” pressure is created at the openingof the burner. This negative pressure pulls air into theburner with the gas and mixes the two together. As thegas/air mixture flow through the burner ports it isignited in the combustion chamber. Hot combustionproducts then rise through a highly efficient heatexchanger. Combustion products then enter a fluecollector and are directed to the outdoors through thegrate top of the heater or a vent pipe and cap.10.3 Heater Components and TheirOperation1. Gas Valve / Regulator - The gas valve controlsgas flow into the manifold. It provides flow onlywhen the temperature controls require heat andonly if all safety controls enable operation. It isalso a positive pressure regulator. It regulatesthe gas pressure in the manifold to specificationsaddressed earlier in this manual. This is neces-sary for proper operation of the burner system.2. LG Temperature Control- The Jandy LGcontroller is an electronic control which senseswater temperature by means of a thermistor andcontrols heater operation to bring the water to the