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4-2
4.2 Quarterly Checks and Services
Check Digital Controller Set Point Accuracy
1. Fill the cookpot with water. Press the controller power switch. When the Heat Mode indicator
(decimal between the first and second digits of the display) goes out, insert a good-grade
thermometer or pyrometer probe into the cookpot, with the end touching the temperature probe
at the lower front centerline of the cookpot and wait one minute.
2. Press the Temperature Display switch once to display the temperature of the water as sensed
by the temperature probe. Press the Temperature Display switch again to display the set
point. The displayed water temperature should be within ±10°F (5°C) of the setpoint and the
temperature shown on the thermometer or pyrometer should be within ± 5ºF (2ºC) of the
displayed water temperature. If either set of readings is outside its range, contact a Factory
Authorized Service Center for assistance.
4.3 Semi-Annual Checks and Services
Clean Combustion Air Blower
1. Unplug the rethermalizer.
2. There are 4 wires (2 orange, 1 white, and 1 black) running from the motor. Remove the wire
nuts and disconnect these wires from the rethermalizer wiring harness, marking each to ensure
proper reconnection.
3. Remove the 4 nuts and bolts securing the blower to its mounting bracket and remove the blower
from beneath the rethermalizer.
4. Remove the 3 motor flange nuts from the side of the blower housing and remove the motor and
blower wheel from the housing.
5. Wrap the motor with plastic wrap to prevent water from entering it. Spray degreasing detergent
on the blower wheel and blower housing. Wait 5 minutes, then rinse under hot water, being
careful not to get water into the motor. Dry with a clean cloth.
6. Reverse steps 1-5 to reinstall the blower.
7. Light the rethermalizer in accordance with the procedure described in Chapter 3, Section 3.1.
8. After the burners have been lit for at least 90 seconds, observe the flames through the burner
viewing ports. The air/gas mixture is properly adjusted when the burner manifold gas pressure
is in accordance with the table on page 4-3 and the burners display a bright orange-red glow. If
a blue flame is observed, or if there are dark spots on a burner face, the air/gas mix requires ad-
justment.
On the side of the blower housing opposite the motor is a plate with one or two locking nuts.
Loosen the nut(s) enough to allow the plate to be moved, then adjust the position of the plate to