Heater And Engine Shutdown; Positive Air Shutdown (Pas) - Generac Power Systems MAC400HC Owner's Manual

Operation
• For maximum fan, press MAX FAN
item B). Maximum fan produces a lower tempera-
ture at a higher air flow.
A
B
Figure 3-7. MANUAL Mode

Heater and Engine Shutdown

CAUTION
Equipment Damage. The emergency stop switch is
not to be used to power down the unit under normal
operating circumstances. Doing so will result in
equipment damage.
1. Press OFF. Heater stops; blower continues running
and a countdown displays. The screen displays
"Heater is cooling down — Please wait"
8).
Figure 3-8. Heater Cooling
NOTE: During cool down, the ON button (A) is disabled.
The blower stops when the countdown expires. The dis-
play indicates when it is okay to shut off the engine
ure 3-9).
14
(Figure 3-7,
C
2. Turn ignition key to OFF.
001579
Unit damage. Do not stop engine before heating
unit is cooled. Doing so could result in unit damage.
3. Disconnect air duct from airplane.
IMPORTANT NOTE: Do not detach air duct until all air
(000246)
pressure is emptied from the duct.
4. Retract air duct and place in storage area.
5. Turn main battery disconnect to OFF.
(Figure 3-

Positive Air Shutdown (PAS)

A
Equipment Damage. The emergency stop switch is
not to be used to power down the unit under normal
operating circumstances. Doing so will result in
equipment damage.
See Figure
activated positive air shutdown (PAS) on the air intake. If
the atmosphere contains combustible propane or natural
gas, a positive air shutdown can be activated to prevent
these gases from being drawn into the engine and ignit-
ing.
001582
The PAS system stops the engine by closing an internal
valve and obstructing intake air. See
PAS is activated by pulling the red T-handle outwards.
The reset knob rotates clockwise to block airflow.
(Fig-
Figure 3-9. Cooling Complete
CAUTION
CAUTION
3-10. This unit is equipped with a manually
Owner's Manual for Flameless Heat Cart
001583
(000240a)
(000246)
Figure 3-11. The