LXi
™
Pool/Spa Heater Installation and Operation Manual Page 43
Section 10. Professional
Maintenance and Service
WARNING
SERVICING SAFETY
Some of the servicing procedures for the LXi heater
are hazardous because they involve fuel gas, elec-
tricity, moving parts and procedures which require
testing or temporary bypass of safety controls. For
this reason, the heater must be serviced only by a
qualifi ed professional service technician.
IMPROPER SERVICE HAZARD
The LXi heater incorporates unique design features.
Incorrect service of this heater can result in per-
sonal injury or damage to property. To avoid such
hazards, the heater must be serviced only by a
qualifi ed professional service technician.
AVERTISSEMENT
PRÉCAUTIONS LORS DES RÉPARATIONS ET
DE L’ENTRETIEN
Certaines procédures d’entretien et de réparation
des appareils de chauffage à faibles émissions LXi
et LXi présentent des dangers, car elles mettent
en jeu des gaz combustibles, des composants
électriques, des pièces mobiles et des procédures
qui nécessitent des mises à l’essai ou la dérivation
temporaire des commandes de sécurité. Pour cette
raison, l’appareil de chauffage doit être entretenu et
réparé uniquement par un technicien professionnel
qualifi é.
DANGERS D’UN ENTRETIEN INADÉQUAT
Les appareils de chauffage à faibles émissions
comportent des caractéristiques techniques
uniques. Une réparation ou un entretien inadé-
quat peut entraîner des blessures corporelles ou
des dommages à la propriété. Pour cette raison,
l’appareil de chauffage doit être entretenu et réparé
uniquement par un technicien professionnel qualifi é.
10.1 General Information
A qualifi ed professional technician must service
the LXi pool heater using Jandy's service procedures.
Before calling for service, however, the owner should
check for obvious problems. The other components in
the pool system, including pump, fi lters and strainers,
water valves, gas supply, electrical power and time
clocks, have an affect on heater operation.
Confi rm that the heater control is set to either
POOL or SPA and that the corresponding temperature
set point is set high enough to make the heater operate.
Make sure the pump is operating, that the fi lter and
all baskets are clean, that there are no mis-positioned
water valves, that the gas or electric power supplies are
not shut off and that time clocks are properly adjusted.
Also be sure that there is no blockage of the exhaust
vent grill or rear louvers, which supply combustion air
to the burners.
10.2 “Premix” Forced-Draft Combustion
System
The LXi pool and spa heater has a forced-draft
combustion system incorporating special burners and a
combustion blower. The burners are of special design
in which the combustion air passes through the burn-
ers, resulting in a "premix" process. When burning
natural gas, this process produces very little Nitrous
Oxide emissions. Air and gas are pushed into the
burner venturis where they are mixed and conveyed
to the combustion chamber. Hot combustion products
pass through a highly effi cient heat exchanger, where
water absorbs most of the heat. Exhaust is directed to
the outdoor air through a grill, or for indoor heaters,
through vent piping.
10.3 Heater Components and Their
Operation
1. Gas Valve / Regulator - The gas valve controls
gas fl ow into the manifold. It provides fl ow only
when the temperature control requires 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 specifi cations ad-
dressed earlier in this manual. This is necessary
for proper operation of the burner system.
2. Combustion Blower and Air Orifi ce – The
blower delivers air to the burners. This air is
used to combust the fuel. This air is also used to
purge the combustion chamber of unburnt fuel
before ignition and after the burners turn off. It is
normal for the fan to start before the main fl ame
starts and to continue operating after the fl ame
has ceased. The air orifi ce controls the amount of
air that is delivered to the burners. This orifi ce is
adjustable. The adjustment helps maintain proper
combustion. It should be adjusted to specifi ca-
tions addressed earlier in this manual.
3. Temperature Control - The LXi heater models
are equipped with an electronic control which
senses water temperature by means of a therm-
istor and controls heater operation to bring the
water to the temperature selected. It has an option
for two separate thermostat settings which are
typically used to set pool and spa temperatures.
4. Ignition Control - The ignition control provides
energy for ignition of the air/gas mixture, moni-
tors the fl ame and controls the gas valve. When
the temperature control calls for heat, the ignition
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