Harman Stove Company XXV, Installation & Operating Manual

31

XXV Pellet Stove

Addendum

Minimizing Smoke During Loss of Power Using Battery Back-up

Harman® strongly recommends installing battery back-up to minimize entry of smoke into the

room in the event of power loss.

Your pellet/biomass burning appliance relies on a combustion blower to remove exhaust. A power failure 

will cause the combustion blower to stop. This may lead to exhaust seeping into the room. Vertical rise 

in the venting may provide natural draft. It is, however, no guarantee against leakage.

There are two Harman® approved battery back-up options for your appliance:
Uninterruptible Power Supply (UPS) UPS

 battery back-ups are available online or at computer and

office equipment stores. Your Harman® appliance with Rev E or later software available beginning in

November 2010 may be plugged directly into a Harman® approved UPS:

•   The APC (American Power Conversion) model #BE750G and the TrippLite model

INTERNET750U are tested and approved. Other brands or models may not be compatible.

When power is lost, a fully charged UPS will power a safe, combustion blower only shut-down. Your

appliance will pulse the blower every few seconds to clear exhaust until the fire is out. 

NOTE: The UPS

provides safe shut-down only. It is not intended for continued operation.

Your appliance will recognize when power is restored. What happens depends on ESP temperature 

and whether it is equipped with automatic ignition:

•  

In “Automatic” setting,

 units equipped with automatic ignition will respond to the set point 

and ESP temperature and resume normal operation.

•  

In “Manual” setting

 or for units without automatic ignition:

•  If the ESP is cool, the appliance will remain shut down.
•  If the fire is out and the ESP is still warm, the feeder may restart. Since the fire is out, the 

ESP temperature will not rise. The unit will then shut-down, and may flash a six-blink status 

error. (See ESP error codes)

•  If the fire is still burning, it will resume normal operation.

Contact your dealer if you have questions about UPS compatibility with your appliance.

Harman® Surefire 512H Battery Back-up

 The 512H connects to a 12 volt deep cycle battery that will 

run your appliance for up to eight (8) hours. It includes a trickle charge feature that keeps your battery

charged when power is available. 

NOTE: If the power is out for longer than battery life, smoke

leakage may still occur unless your stove has been safely shut down.

CAUTION! Always keep appliance doors and hopper lid closed and latched during operation 

and during power failures to minimize risk of smoke or burn-back.
CAUTION! Use only Harman® approved battery back-up devices. Other products may not 

operate properly, can create unsafe conditions or damage your appliance.

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