HWAM Autopilot IHS 3420, User Manual

18

in external circumstances. Nevertheless, it is important to use clean and dry wood (humidity approx. 
16-20%). Read more on www.hwam.com.

Cleaning the glass
We recommend wiping the glass after a fire. This is best done using a paper towel.

Types of fuel
The stove may be damaged by very high temperatures and the glass may turn white, for example. This 
can be avoided by never allowing the stove to burn with the ashpan open and taking great care with 
types of fuel that develop excessive heat, such as briquettes. If the flue gas temperature exceeds 580 

o

C, 

the HWAM Autopilot IHS

TM

 will revert to safety adjustments and automatically turn down the air valves 

to avoid overheating. When the temperature is reduced to 450 

o

C, the normal functions apply again.

It is recommended that you use birch or beech wood that has been chopped and stored for at least 
one year in an open shed exposed to sun and wind. The wood must be dry (max. 20% water contents) 
before it is stored indoors. It is recommended that kindling wood is stored indoors for a couple of 
days prior to use.

Briquettes give off a lot of heat. Certain types expand considerably, thus causing an uncontrollable 
combustion.

Coal burns at a high temperature and makes a lot of soot. Coal must be burned using the coal insert. 
Not suitable for fuel in these models.

Coke burns at a high temperature and makes a lot of soot. Coke must be burned using the coal insert. 
Coke causes severe wear and tear to stove and combustion chamber and, consequently, this consider-
ably reduces the life expectancy of the stove and chimney.
Not suitable for fuel in these models.

The stove is EN 13240 approved for firing wood only. No particle board, lacquered, painted 
or treated wood, plastics, or rubber may be burned.

M

AintEnAncE

Cleaning
Any maintenance of the stove should only be carried out when it is cold. Daily maintenance is limited 
to vacuum cleaning the stove externally, using the soft brush attachment. You can also dust the stove 
using a dry, soft cloth or brush. But remember, only when the stove is cold. Do not use water, spirit 
or any other kind of cleaner, as this will damage the lacquer.
Once a year, the stove should be thoroughly serviced. The combustion chamber should be cleared 
of ashes and soot. The hinges and the closing hook must be greased with liquid copper fat spray 
(heat-resistant up to 1100°C), see drawing F. Lift the door approx. ½ cm and spray copper fat onto 
the hinge leaf.

Service inspection
Your stove should be given a thorough, preventive inspection once every two years. This includes: 
•  Thorough cleaning of the stove.
•  Checking gaskets. Replace gaskets if they are not intact or have softened.
•  Checking of heat insulating material and possibly replacement.
•  Checking of the bottom/shaking grate.
•  Use copper grease for hinges and locking hooks (see drawing F).
All service checks must be performed by an authorised fitter. Use only original spare parts.