Generac Power Systems MLTS Owner's Manual page 41

Operation
1. See 3-51. Remove the motor cover (A).
Figure
Figure 3-51. Manually Lowering the Mast
2. Attach a drill chuck firmly to the exposed motor
shaft (B).
3. Using the drill, slowly rotate the motor shaft
counterclockwise to lower mast.
4. Detach the drill chuck and install the motor cover
after the mast is completely lowered.
Electronic Positive Air Shutdown
(PAS)
(If Equipped)
See Figure 3-52. This unit may be equipped with a
positive air shutdown (A) on the air intake. The PAS
system automatically stops the engine if an overspeed is
detected. Engine overspeed can occur if the atmosphere
contains elevated levels of combustible propane or
natural gas.
A
Figure 3-52. Positive Air Shutdown
The PAS system stops the engine by closing an internal
valve and obstructing intake air. Shutdown is triggered
automatically by an output from the controller or manually
by pulling the T-handle (B).
The reset knob (C) rotates 90° to block airflow. If the knob
is parallel to the pipe centerline (as shown), the valve is
open. If the knob is perpendicular to the pipe centerline,
the valve is closed and airflow is blocked.
36
Test the PAS
Test the PAS at least once a month to ensure optimal
A
valve performance. There are two methods:
1. Pull the T-handle. (NOTE: The valve must be open
before testing.)
B
2. Press the emergency stop button.
Testing the PAS triggers an actuator, closing the butterfly
valve inside the valve body. An audible click can be
heard when the actuator engages. Confirm that the valve
is closed by verifying that the knob has rotated
perpendicular to the pipe centerline. If valve does not
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close, contact Generac Mobile Technical Support.
Reset the PAS
IMPORTANT NOTE: Before resetting the PAS, turn
the control power switch OFF (O). This will prevent
unexpected engine start-up during the procedure.
1. Rotate the reset knob and hold it in place while
pulling the T-handle until reset knob rotates coun-
terclockwise into plunger detent. An audible "click"
indicates the reset knob has seated properly.
2. Verify that the reset knob is parallel to the intake
pipe centerline.
3. Release T-handle, and then release reset knob.
The reset knob should remain parallel to the intake
pipe centerline.
Coolant Heater or Engine Block
Heater (If Equipped)
The coolant heaters are designed to prevent engine
coolant from freezing in extreme cold weather conditions.
While the heater is designed to be operated overnight if
B
necessary, 2–5 hours of heating just prior to starting is
usually sufficient for proper engine starting.
NOTE: Use coolant heater only in its designated
location. Incorrect use can damage the engine.
Proceed as follows when operating a unit equipped with
a lower radiator hose heater.
C
1. Verify the unit is level to maintain correct orienta-
tion of the heater while it is in operation.
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2. Verify the cooling system is full of the correct
mixture of water and engine coolant before each
heater use.
3. Use only an undamaged, outdoor rated, three-
prong grounded 120VAC extension cord with a
minimum amperage rating of 10A. Connect the
cord to a properly grounded 120VAC GFCI outlet.
4. Before starting the engine, unplug the extension
cord from the power first, then unplug the heater
cord set from the extension cord.
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