Hase Ottawa - Manual (Page 41)

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charcoal residue; in this case, the burn-off
phase was incomplete.
– The colour of the flue gases emitted at the
chimney pot
Here, the following applies: the more invisi-
ble the flue gases exiting the chimney, the
better the combustion quality.
During the transitional seasons (spring/autumn),
outdoor temperatures above 16°C can impair the
chimney draught. If a draught cannot be created at
these temperatures by rapidly burning paper or thin
wood shavings (quick fire), you should refrain from
lighting the stove.
14. Wood Moisture Content and
Calorific Value
Rule of thumb: the more damp the wood, the lower
the calorific value.
The calorific value of the wood depends largely on
the wood moisture content. The more moisture the
wood contains, the more energy expended to evapo-
rate it during the combustion
phase; this energy is then lost. The more damp the
wood, the lower its calorific value.
An example: freshly cut wood has a moisture con-
tent of approx. 50% and a calorific value of around
2.3 kWh/kg; in contrast, wood which has been effici-
ently air-dried has a moisture content of approx. 15%
and a calorific value of around 4.3 kWh/kg.
Accordingly, if you burn very moist wood, you will
have about half the thermal output with the same
quantity of wood. Furthermore, burning moist wood
results in substantial soot
build-up on the fire box window. Moreover, when
moist wood is burned, the resultant water vapour
can condense in the flue pipe or chimney, which can
lead to a build up of shiny soot on the chimney or
chimney creosote. Chimney creosote can cause un-
pleasant odours and damage brick chimneys, while
shiny soot poses a fire hazard (chimney fire). In ad-
dition, if the wood has a high moisture content, the
combustion temperature decreases, which prevents
complete com-
bustion of all the wood components and causes
considerable environmental pollution.
You can use a wood moisture meter to determine the
residual moisture content of your firewood.
15. Storing and Drying Wood
Wood needs time to dry. If stored properly, it will air-
dry in approx. 2 to 3 years.
Saw, split, and store the wood ready for use; this en-
sures rapid drying because smaller pieces of wood
dry better than larger, uncut logs.
Stack and store your wood logs in a ventilated loca-
tion that is as sunny as possible, ideally facing sou-
th, and ensure that the wood is protected from rain.
Leave a hand’s width between the individual piles of
wood so that air can flow between them and carry
away any escaping moisture.
Do not cover your wood stacks with plastic sheeting
or tarpaulins; otherwise the moisture cannot escape.
Do not stack fresh wood in a cellar or basement, sin-
ce it will rot rather than dry due to the lack of airflow.
Only store already dried wood in dry and well-venti-
lated cellar or basement rooms.
16. Cleaning and Maintenance
16.1 Steel Cladding
Hase stoves are coated with a heat-resistant open
pore lacquer that provides only limited corrosion
protection; accordingly, a rust film may develop in
some cases.
Do not use any detergents containing acid (e.g.
citrus or vinegar cleaners) to clean the steel parts.
The steel parts can be adequately cleaned by wiping
them down with a slightly moistened cloth.
Avoid using excessive water to clean the floor/floor-
plate. Any water that spills from kettles, boilers, or
dishes should be immediately mopped up.
Do not install the stove in “damp rooms”, e.g. con-
servatories or winter gardens. Do not temporarily
store the stove in an unheated building shell or ga-
rage.
NOTE!
Treat areas covered in a rust film with
the original Hase Stove Lacquer Spray.
Be sure and follow the instructions on the
spray can. Your authorised Hase dealer
carries the stove lacquer spray and can
give you tips on using it.