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With the T641 controlling the ML6161 or equivalent
actuator, lower the set point of the thermostat to call for
cooling. Observe the operation of the motor. If the damper is
closed, it should begin to open. If not, adjust the set point of
the T641 higher to determine if the wiring is correct. If no
movement is observed, check for the presence of 24 Vac
between terminals C and Y during a call for cooling. With the
proper wiring and 24 Vac present, the actuator should operate
correctly. If 24 Vac is not present between C and Y on a call
for cooling, replace the T641.
To check out the ML6161 when controlled by the T641,
determine the direction the damper shaft moves to open the
damper (cw or ccw). See Fig. 7. Place 24 Vac across the
appropriate common-cw
terminals to energize the actuator. The ML6161 should
begin to open the damper. If the motor does not run, try
switching the 24 Vac across opposite common-cw or ccw
terminals to determine if the damper will begin to close.
Replace the ML6161 if the motor does not run in either
direction.
5
Checkout
or common-ccw
62-0101
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