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Installation Instructions
THIS PRODUCT MUST BE INSTALLED AND SERVICED BY A PROFESSIONAL SERVICE TECHNICIAN, QUALIFIED IN POOL
HEATER INSTALLATION. THE MASTERTEMP HEATER IS INTENDED FOR INSTALLATION WITH A METERED GAS PRESSURE
REGULATOR.
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. If not fitted on the heater, the installer must installed any safety
devices according to
the European Standard Codes of Practice.
NOTICE: UPON INSTALLATION THE INSTALLER MUST INSTRUCT THE
USER IN THE OPERATION AND SAFETY DEVICES AND PROVIDE A
COPY OF THE HEATER'S USER'S GUIDE (THIS MANUAL).
HEATER DESCRIPTION
Figure 8 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.
63 mm (2 in - UK) PVC water piping connects directly to the manifold/
header on the heat exchanger using 63 mm (2 in - UK) 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 55° C (131° 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 inlet temperature control switch, which opens if the inlet temperature goes above 45° C (110° 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.
P/N 475106 Rev. D 1/2016
All manuals and user guides at all-guides.com
MASTERTEMP
Section 2. Installation
Air
Mixer
Inlet
(Cold
Water)
Outlet
Burner
(Mixed
Water)
™
Pool and Spa Heater Installation and User's Guide
| 7
Blower
Heating Coils
Figure 8.
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