Heat exchanger overheating may damage the ASH and under some conditions a safety hazard may
result. An overheat shutdown occurs when the combustion air and ventilation air fan assemblies are
turned off at the same time when in the heating modes. Always set the control panel MODE SWITCH
to the VENT position for at least 2 minutes when shutting down the ASH from the heating modes.
Set control panel MODE SWITCH (1) to VENT position for at least 2 minutes prior to shutdown.
Set control panel MODE SWITCH (1) to OFF position to shut down ASH.
Install return air duct cover (2) if air hose (3) was not attached.
END OF WORK PACKAGE
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