Page 33
ENGLISH
Installation and Operation Manual
|
Jandy® Legacy™ Model LRZM Pool/Spa Heater by Zodiac®
Section 10. Professional
Maintenance and Service
WaRNiNG
SeRviciNG SaFetY
Some of the servicing procedures for the Legacy
heater are hazardous because they involve fuel
gas, electricity, moving parts and procedures which
require testing or temporary bypass of safety con-
trols. For this reason, the heater must be serviced
only by a qualified professional service technician.
iMPRoPeR SeRvice HaZaRd
The Legacy 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.
aveRtiSSeMeNt
PRÉcautioNS LoRS deS RÉPaRatioNS et
de L’eNtRetieN
Certaines procédures d’entretien et de réparation
des appareils de chauffage à faibles émissions
Legacy et Legacy 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 qualifié.
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 qualifié.
10.1 General information
A qualified professional technician must service
the Legacy model LRZ millivolt pool heater using
Zodiac Pool Systems, 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 Legacy 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 Legacy model LRZ millivolt pool heater
has an atmospheric combustion system. This system is
illustrated in Figure 24.
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 flows through the burner ports it
is ignited in the combustion chamber. Hot combus-
tion 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.
VENT TOP
FLUE COLLECTOR
HEAT EXCHANGER
COMBUSTION CHAMBER
BURNER
BURNER TRAY SHELF
EXHAUST
AIR FLOW
Figure 24. atmospheric combustion System
Summary of Contents for Jandy Legacy LRZ Millivolt
Page 2: ......
