MP–129 Series Water-Saver
350545 4–3
TEMPERATURE SWITCH ADJUSTMENT
TOOLS REQUIRED
• Digital Thermometer
CHECK
1. Turn on the hot and cold water lines. Using the digital
thermometer set for °F, place the thermocouple probe in
the stream of the incoming water.
The temperature should read 120°F or greater.
2. Adjust the thermocouple to be approximately halfway down
into the tank.
3. When the tank is approximately three-fourths (3/4) full, the
solenoid valve (cold water supply) should also be admitting
water into the tank. Observe the water flow in the tank from
the valve.
4. Turn off the hot water supply to the tank.
As the water is cooled, the solenoid valve should be de-
energized (check with screwdriver).
5. Using the digital thermometer set for °F, take the
temperature of the water in the tank and record it on the
line in the left margin.
The water temperature should be less than 115°F.
ADJUST
6. If the water in the tank is not less than 115°F, r e m o v e t h e
cover of the temperature switch.
7. Using a 1/4” open end wrench, turn the stem
counterclockwise to lower the temperature setting.
8. Turn on the hot water and retest until the water solenoid is
energized whenever the water temperature rises above
115°F. Verify the solenoid valve turns off the cold water
supply when the tank temperature is lowered to
approximately 96°F.
9. Use the ball valve at the circulating pump inlet to drain the
tank then refill the tank as described above.
10. After the correct temperature is attained, replace the
temperature switch cover.
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