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Hi-E2
Figure 29. Burner fl ame (visible near top of heater in
mirror).
SECTION 4.
Maintenance and Service
WARNING
SERVICING SAFETY
Some of the servicing procedures for the Hi-E2 pool
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 qualifi ed professional service technician.
IMPROPER SERVICE HAZARD
The Hi-E2 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 qualifi ed professional service technician.
4A. General
A qualifi ed professional technician must service
the Hi-E
pool heater using Jandy service procedures.
2
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 effect on heater operation.
Confi rm that the Flex Temp heater control is
set to "pool" or "spa" and that the cor re spond ing
temperature knob is set high enough to make the
heater operate. Make sure the pump is operating, that
the fi lter and strainers aren't clogged, that there are no
mis-po si tioned water valves, that the gas or electric
power supplies aren't shut off and that time clocks are
properly adjusted. Also be sure that the combustion
air fi lter is clean and that there is no blockage of the
vent or com bus tion air inlet. See later section on
combustion air fi lter service.
4B. Induced-Draft Combustion System
The Hi-E
pool heater has an advanced
2
combustion system which makes it highly effi cient and
reliable. This system is il lus trat ed in Figure 30.
A special corrosion resistant high-speed blower
pulls fl ow through the system and exhausts it to
the outdoors. Air is pulled into the system through
a combustion air supply duct, when provided, and
through an air fi lter into a venturi. The venturi
functions much like an automobile carburetor venturi -
i.e. when air is forced through it, a "negative" pressure
is created at the venturi throat. This negative pressure
pulls gas through a me ter ing orifi ce, resulting in an
optimal mixture of air and fuel gas. The air and gas
are thor ough ly mixed in the venturi tailpipe, pulled
through a special burner and ignited in the combustion
chamber. Hot combustion products are then pulled
through a highly effi cient downward-fl ow heat
exchanger. Combustion products are cooled below
their dew point and condensate water is formed and
drained away. Flow then enters the blower, where it is
forced out of the heater at the vent terminal or through
a vent pipe to the outdoors.
4C. Heater Components and Their Opera-
tion
Gas valve / Regulator - The gas valve controls
1.
gas fl ow into the venturi. It pro vides fl ow only
when the temperature control require heat and
only if all safety controls enable operation. It is
also a negative pressure regulator. It regulates
the gas pressure to 0.2" WC less than the air
pressure at the venturi inlet. This is necessary for
proper operation of the venturi system and cannot
be done with common (positive pressure) gas
valves.
Combustion blower - The combustion blower is
2.
a specially designed to handle moist combustion
products, having spe cial plastic housing and
impeller. It is powered by a brushless DC motor.
Temperature Control - The Flex Temp control
3.
is an electronic control which senses water
temperature by means of a thermistor and
controls heater operation to bring the water to
that selected. It has two temperature setting
knobs which are typically used to set pool and
spa temperatures. A selector switch determines
which setting is chosen.
Ignition Control - The ignition control provides
4.
energy for ignition of the air/gas mixture,
monitors the fl ame and controls the combustion
blower and gas valve. When the temperature
control requires heat, the ignition control
starts the blower, providing a pre-purge of the
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