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R
R
W
B
BLUE
B
W
SERIES 90 MOTOR
SERIES 90
CONTROLLER
Fig. 2. Typical cooling hookup for the Q209E and a
Modutrol IV motor.
R
R
B
B
BLUE
W
W
SERIES 90 MOTOR
SERIES 90
CONTROLLER
Fig. 3. Typical heating hookup for the Q209E and a
Modutrol IV motor.
Q209
WHITE
RED
M3280
Q209
W
B
R
RED
WHITE
M3279
3
Q209E MODUTROL IV MANUAL POTENTIOMETERS
DAMPER MOTORS
4
C
1
T 1
R
L1
(H OT )
T 2
3
L2
4
2
3
EXTERNAL
CONTROL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLAOD PROTECTION AS REQUIRED.
2
IF MINIMUM POSITION POTENTIOMENTER IS NOT USED,
JUMPER TERMIALS 3 AND 4.
3
IF EXTERNAL CONTROL IS NOT USED, JUMPER TERMINALS
2 AND 4. IF CONTROL SWITCH IS OPEN, M7685A MOTORS
DRIVE CLOSED.
TRANSFORMER MAY BE INTERNAL OR EXTERNAL.
4
Fig. 4. Q209E with M7685.
CHECKOUT
After installation, check for proper operation of the system as
follows:
1. 1. With the potentiometer in the closed position (fully
counterclockwise rotation
be able to run the motor to fully close and fully open the
damper. Set the controller to close the damper and
adjust the Q209E to the open position (fully clockwise
rotation
). The motor should operate to open the
damper to the minimum open position (50% when using
a 150-ohm Q209 and 100% when using a 300-ohm
Q209).
2. After checking the system operation, adjust the potenti-
ometer to the desired setting.
OPERATION
The Q209E Manual Potentiometer limits the minimum position
of a Modutrol IV motor. A typical application is a cooling system
that uses the controller and a Modutrol IV motor to adjust
outdoor and return air dampers to obtain maximum use of
outdoor air for cooling. The Q209E is used to limit the minimum
position of the dampers so that a specified amount of fresh
outdoor air is admitted during the time the building is occupied.
When used with spring return motors, removing external power
overrides the minimum position potentiometer and returns the
motor to the normal mechanical position (either open or
closed, as applicable).
+
MODULATING
–
DC VOLTAGE
SOURCE
WHITE
RED
2
MINIMUM
POSITION
POTENTIOMETER
M27403
), the controller should
63-2226—02
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