P/N 475114 Rev. F 8/2020 MASTERTEMP 125 Pool and Spa Heater Installation and User’s Guide
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BASIC SYSTEM OPERATION
Start the pool pump, make sure the pump is running and is primed, this will close the water pressure switch and supply
power to heater. Be sure the pool and/or spa is properly filled with water. Follow the Lighting/Operating instructions below.
Section 2. Operation
FOR YOUR SAFETY: READ BEFORE LIGHTING
START-UP AND OPERATION
HEATER HSI ELECTRONIC IGNITION LIGHTING/OPERATION
If you do not follow these instructions exactly, a fire or explosion may result causing property
damage, personal injury or loss of life.
Do not attempt to light the heater if you suspect a gas leak. Lighting the heater can result in a
fire or explosion which can cause personal injury, death, and property damage.
WARNING
BEFORE START-UP
A. This appliance does not have a pilot. It is equipped
with an ignition device which automatically lights the
burners. Do not try to light the burners by hand.
B. BEFORE OPERATING, smell all around the appliance
area for gas. Be sure to smell next to the oor because
some gas is heavier than air and will settle on the oor.
WHAT TO DO IF YOU SMELL GAS
– Do not try to light any appliance.
– Do not touch any electrical switch; do not use any phone
in your building.
– Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
– If you cannot reach your gas supplier, call the Fire
Department.
C. Use only your hand to turn the gas control on or off.
Never use tools. If you cannot change the ON/OFF
setting by hand, don’t try to repair it, call a qualied
service technician. Forced or attempted repair may result
in a re or explosion.
D. Do not use this heater if any part has been under water.
Immediately call a qualied service technician to inspect
the heater and to replace any part of the control system
and any gas control which has been under water.
E. Do not operate the pool heater unless the pool or spa is
properly lled with water.
F. Before operating the appliance for the rst time or
after it has been off for an extended time, perform the
following checklist:
1. Remove debris or other articles from inside the heater
and the area around the heater and its exhaust vent.
Make sure the ventilation openings are clear of debris
or obstruction. For installations in an enclosed space,
make sure openings for combustion and ventilation
air are unobstructed.
2. Keep heater area clear and free from combustibles,
ammable liquids and chemicals.
3. Check that all water connections are tight.
4. Water must be owing through the heater during
operation. Make sure that pool/spa is lled with water
and have pump operating. Check that water ow is
unobstructed from the appliance. When operating
for the rst time or after an extended shut-down, run
lter pump for several minutes to clear all air from
Section 2. Operation
START-UP AND SHUTDOWN INSTRUCTIONS ARE ON THE LABEL ATTACHED TO THE COVER OF THE APPLIANCE CONTROL BOX.
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.
WARNING! DO NOT INTERFERE WITH ANY SEALED COMPONENTS. THIS CAN ONLY BE DONE BY A
QUALIFIED SERVICE PROFESSIONAL.
THE MASTERTEMP HEATER IS INTENDED FOR INSTALLATION WITH A METERED GAS PRESSURE REGULATOR.
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