Section 2. Installation Instructions; Heater Description; Sequence Of Operation - Pentair MASTERTEMP 200 HD Installation And User Manual

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
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.

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 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. A 2/2014
the British Standard Codes of Practice.
Air
Inlet
(Cold
Water)
Outlet
(Mixed
Water)
MASTERTEMP ™ Pool and Spa Heater Installation and User's Guide
Section 2. Installation
Blower
Mixer
Burner
Heating Coils
Figure 8.
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