Convection Blower Motors - Blodgett MT3255 Series Service And Repair Manual

MT3255 and MT3270

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 left to right from the oven's rear. Typically
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 rota-
tion amperage draw is approximately 1 amp. If the
measured amperage is less than .5, check for
proper motor rotation direction.
MT3270 BLOWER WHEEL ROTATION
Motor Motor
#1 #2
(Side view)
Motor #1 Motor #2
(CW) (CCW)
(Top view)
Blower
Motor
Control
Box
Motor
Motor
#3
#4
Control
Box
Motor #3 Motor #4
(CW)
(CCW)
TO CHECK LOW-LIMIT
1. Turn the oven on and let it heat up to approxi-
mately 200_F (93_C).
2. Shut the oven off. The blowers should come
back on in several seconds.
3. When the blowers shut off, turn the oven on.
If computer controlled 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 refer to the Troubleshooting
section page 5---3.
For standard controls, turn the blower switch
to on to record the temperature. Adjust the hi/
lo board if necessary. See page 4---6 for tem-
perature calibration procedure.
Slinger
Cooling Blade
MT3255 BLOWER WHEEL ROTATION
Motor
#1
Motor #1 Motor #2
(CW)
FIGURE 1
4---1
Control
Motor
Motor
#2
#3
(Side view)
Control
Motor #3
(CCW)
(CCW)
(Top view)
Box
Box