Operation Of Ignition Module; Temperature Setting / Maximum Temperature Set Point - Pentair MASTERTEMP MT125HD Installation And User Manual

6 | Section 1. Operation Instructions
SAFETY CONTROLS,

OPERATION OF IGNITION MODULE

, (see Figure 5),
The Ignition Module
and operates on 24VAC supplied by the transformer. The control
utilizes a microprocessor to continually and safely monitor,
analyze, and control the proper operation of the gas flame holder.
The module with the presence of the flame sensor, using flame
rectification, allows the heater to operate.
TEMPERATURE SETTING
The heater comes factory set at 25.6° C (78° F). for the pool mode and 37.8° C (100° F). for the spa mode. Using the up
and down arrows, you can set the pool/spa thermostats to a minimum temperature of 18.3° C (65° F.), or a maximum of
40° C (104° F). If you desire to heat only one body of water, the thermostat is capable of an off mode. As an example,
if you only wish to heat the spa and not the pool, simply depress and hold the pool down arrow, and the thermostat will
lower its setting to 18.3° C (65° F.) then go to an off mode. See below to change the heater's factory set temperature
settings.
MAXIMUM TEMPERATURE SET POINT
1. Unbolt and remove the door panels (see Figure 6).
2. Access the control panel board on the underside of the top cover.
Locate the yellow button on the corner of the control board.
3. Push the Max. Temp. Set Point button on the back of the
control board (see Figure 7).
The following sequence should happen:
1. The unit turns on and the POOL ON light will
turn on.
2. Press the
 TEMP or TEMP
control panel) to set maximum pool temperature.
3. Wait up to 30 seconds; the POOL ON light will turn off
and the SPA ON light will turn on. To override the time
delay, push the Max. Temp. Set Point button again.
4. Press the
 TEMP or TEMP
panel and set maximum spa temperature to 40°C
(104° F) or less.
Wait up to 30 seconds; the SPA ON light will turn off
5.
and the unit will shut down. To override the time delay,
push the Max. Temp. Set Point button again.
6. Reinstall the access door panels.
MasterTemp 125 Pool and Spa Heater Installation and User's Guide
(continued)
is microprocessor based
button (on TOP of the
button on the control
Diagnostic LED
Flame Current
Check Point
For Heat
Lockout
Door Acess Panel
1 Flash - Air Flow Fault
2 Flashes - Flame No Call
3 Flashes - Ignition
Figure 5.
Figure 6.
Top Panel
Door Acess Panel
Figure 7.