Rev. D 27-06-11
P/N 474131
9
Section 3.
Installation
Installation Instructions
Gas
Air
Mixer
Blower
Inlet
(Cold
Water)
Exhaust
Heating Coils
Outlet
(Mixed
Water)
Burner
Figure 1.
THIS PRODUCT MUST BE INSTALLED AND SERVICED BY A PROFESSIONAL SERVICE TECHNICIAN, QUALIFIED IN POOL
HEATER INSTALLATION.
Pentair strongly recommends that all vents, pipes and exhaust systems be initially and periodically tested for proper operation. This
testing can be accomplished by using a hand-held carbon monoxide meter and/or by consulting with a gas professional.
Pool heaters must be used in conjunction with carbon monoxide detectors installed near the pool heater. The carbon monoxide
detectors must be periodically inspected for proper operation so as to insure continued safety. Broken or malfunctioning carbon
monoxide detectors must be replaced immediately.
HEATER DESCRIPTION
Figure 1
is a diagram of the heater showing how it operates. Precisely
matched orifice plates meter the air and gas into the mixer. The blower
draws the air and gas through the mixer and forces it into the burner’s
flame holder. A sealed heat exchanger surrounds the flame holder,
discharging exhaust gases out the flue.
Five (5) cm PVC water piping connects directly to the manifold/
header on the heat exchanger using 5 cm PVC slip unions provided
with the heater. The outer manifold remains cool; no heat sinks are
required. A thermal regulator and an internal bypass regulate the water
flow through the heat exchanger to maintain the correct outlet
temperature. The heater operator control panel board assembly is
located on top of the heater.
SEQUENCE OF OPERATION
An electronic temperature sensing
thermistor
in the manifold adapter inlet controls the heater operation. When the inlet
water temperature drops below the temperature set on the
operating control
, the
burner controller
supplies power to
the combustion
air blower
through a series of
safety interlocks
. The interlocks consist of:
• the
pressure switch
(
PS
), which senses that the pump is running,
• the
high limit switch
(
HLS
), which opens if the heat exchanger outlet temperature goes above 53° C (127° F), and
• the
air flow switch
(
AFS
), which senses the pressure drop across the air metering orifice,
• the
automatic gas shut-off
(
AGS
) switch, which opens if the heat exchanger outlet temperature goes above 60° C (140° F).
• the
stack flue sensor
(
SFS
), which shuts down the heater if the flue gas temperature reaches 249° C (480° F).
The air flow switch (AFS) senses the pressure drop across the air metering orifice. As soon as there is sufficient air flow,
the AFS closes, closing the circuit to the
hot surface igniter
(
HSI
), which ignites the fuel mixture. On a call for heat, the
blower and HSI are energized. In about 20 seconds, the gas valve opens and ignition occurs. The HSI then switches to a
sensing mode and monitors the flame.
The heater is equipped with a digital operating control that enables the user to pre-set the desired pool and spa water
temperatures. The control enables the user to select between pool and spa heating, and features a digital display that
indicates the water temperature.
PUTTING THE HEATER INTO SERVICE
If the heater is installed below the level of the pool, or more than 0.6 meters (2 feet) above pool level, the pressure switch
setting should be adjusted. See “WATER PRESSURE SWITCH” in the “SAFETY CONTROLS Section” (
page 32
) and
the “CAUTION” under “BELOW POOL INSTALLATION Section” (
page 12
).
Before putting the heater into service for the first time, follow the instructions under “BEFORE START-UP” (
page 30
) in
the front of this manual. Check for proper operation of the heater by following the steps under “OPERATION
INSTRUCTIONS.”
Damage to equipment caused by improper installation or repair will void the warranty.
