Cast Iron Rings (If Present); Calculation.of.the.thermal.power; Varnished Products (If Present); Enamelled Products (If Present) - La Nordica GEMMA Manual Del Usuario

vARNIsHED PRODUCTs (IF PREsENT)

After some years of product use a change in the varnished details colour is totally normal. This is due to the considerable temperature range
the product is subject to whenever in use and to the varnish ageing of time passing by.
ATTENTION: before any possible application of the new varnish, do clean and remove all the traces from the surface which has to be varnished.

ENAMELLED PRODUCTs (IF PREsENT)

For the cleaning of enamelled surfaces use soap water or not aggressive and not chemically abrasive detergents.
After the cleaning do NOT let soapy water or any cleanser dry but remove them immediately.
DO NOT use sandpaper or steel wool.

CHROMIUM-COMPONENTs (IF PREsENT)

If the components become bluish due to overheating, this can be solved with a suitable product for cleaning. DO NOT use abrasives or
solvents.

CAsT IRON RINgs (IF PREsENT)

The cast iron rings needs to be periodically cleaned by using sandpaper (grain 150) without touching the enamelled parts..
IMPORTANT : to avoid rust DO NOT forget pots or pans on the cold stove. This would create rust rings, unpleasant to see and
difficult to remove.
CALCULATION OF THE THERMAL POWER
There is not an absolute rule for calculating the correct necessary power. This power is given according to the space to be heated, but it
depends also largely on the insulation. On an average, the calorific value necessary for a properly insulated room is 30 kcal/h per m
external temperature of 0°C).
Given that 1 kW corresponds to 860 kcal/h, it is possible to adopt a value of 35 W/m
Let's suppose one wishes to heat a room of 150 m
W/m = 5250 W or 5,25 kW. As main heating, a 8 kW device is therefore sufficient.
3
Fuel
Dry wood (15% humidity)
Wet wood (50% humidity)
Wood briquettes
Brown coal briquettes
Normal anthracite
Coke
Natural gas
Naphtha
Electricity
28
(10 x 6 x 2.5 m) in an insulated apartment. In this case, it is necessary to have 150 m
3
Approximate combustion value
Unit
kcal/h
kg 3600
kg 1850
kg 4000
kg 4800
kg 7700
kg 6780
m 7800
3
L 8500
kW/h 860
ENgLIsH
.
3
Required quantity in relation to 1 kg of
dry wood
kW
4.2
2.2
5.0
5.6
8.9
7.9
9.1
9.9
1.0
3 (for an
x 35
3
1,00
1,95
0,84
0,75
0,47
0,53
0,46
0,42
4,19