Repair manual

MT1828
3 --- 1
CONVECTION BLOWER MOTORS
TO CHECK MOTOR ROTATION
1. Remove the back of the oven body and verify
proper motor rotation. (See FIGURE 1)
For motor placement, the direction of rotation is
viewed from the oven’s rear, working from left to
right, beginning at the control box. In most cases,
the motor direction is referenced to the end of the
shaft (EOS). However, due to the vertical position-
ing of the motors in Mastertherm ovens, it is more
instructive to reference the end of the motor (EOM)
as looking from the rear of the oven. In FIGURE 1
all directions are taken from EOM. The correct ro-
tation amperage draw is approximately .6 amp
cold/.3 amp hot. If the measured amperage is less
than .3 amp cold/.1 amp hot, check for proper mo-
tor rotation direction.
TO CHECK LOW-LIMIT
1. Turntheovenonandletitheatuptoapproxi-
mately 200_F(93_C).
2. Shut the oven off. The blowers should come
back on in several seconds.
3. Wait for the blowers to shut off.
4. Oncetheblowersareoff,turntheovenback
on. Press the “ACT TEMP” key to verify that the
blowers shut off between 135_F(57_C) and
170_F(77_C). If the blowers do not shut off re-
fer to the Troubleshooting section page 5---6.
Motor #1
CCW
(Side view rotation of Blower Wheel)
(Top view rotation of B lower Wheel)
Blower
Motor
Slinger
Cooling
Blade
Motor #2
CCW
Control
Box
Control
Box
Motor #1 Motor #2
Blower
Motor
FIGURE 1