Section 2. Installation Instructions - Pentair MASTERTEMP 125 Installation And User Manual

Section 2: Installation Instructions
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. If not fitted on the heater, the installer must
installed any safety devices according to the current local codes.
HEATER DESCRIPTION
Figure 10 shows a diagram of the heater and how it operates.
The blower draws the air and gas through the mixer and forces it
5 cm (2") PVC water piping connects directly to the manifold/
header on the heat exchanger using 4 cm (1.5") PVC slip unions
provided with the heater. The outer manifold remains cool; no
heat sinks are required. A thermal regulator and an internal bypass
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;
pressure switch (PS), which senses that the pump is running,
high limit switch (HLS), which opens if the heat exchanger outlet temperature goes above 55° C (131° F), and
automatic gas shut-off (AGS) switch, which opens if the heat exchanger outlet temperature goes above 60° C
(140° F).
inlet temperature control switch, which opens if the inlet temperature goes above 45° C (110° F).
heating, and features a digital display that indicates the water temperature.
P/N 460906 Rev. B 5/2014
(AFS
(SFS
hot surface igniter (HSI), which ignites the fuel mixture. On a call for heat,
Section 2: Installation Instructions
Air
Inlet
(Cold
Water)
Outlet
(Mixed
Water)
MASTERTEMP 125 Pool and Spa Heater Installation and User's Guide
™
Blower
Mixer
Burner
Heating Coils
Figure 10.
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