Alke 81 Series Manual do utilizador, de serviço e de instalação - Página 7
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Operation
New heaters
New heaters need a cleaning period before they are ready for operation. Turn the ventilation to maximum
position or place the heaters outside in the open air. Fire the heaters for at least two hours on full capacity
to burn-off oily and greasy remnants of the production. Make sure that after two hours all smoke and
smell is disappeared. The smoke and smell can be unhealthy, so keep animals and human beings away
till the heaters and the environment air is clean.
Ignition of the heater
Warning: after a heater is extinguished (intentionally or unintentionally) wait always for 3 minutes before
(re)ignition. This is a worldwide safety rule and intended to ventilate unburned gases away and to leave
enough time for the thermocouple device to close.
Ignition shall always be done in high fire position only. After the heater is pre-heated for roughly a minute,
heaters that are allowed to operate in low fire position can be adjusted now to low fire or positions in
between. In poor quality gas conditions, cold ignition can be difficult. Partly covering the air inlet by hand
for a few seconds will help to stabilize the flame.
41, 61, 81 (F and FT versions):
1) Open all gas taps (and turn the thermostat or gas
pressure regulator on maximum).
2) Keep a flame of a BBQ lighter (or long match) in the
ignition hole of the burner gauze near the thermocouple.
3) Press the knob of the gas safety device and wait for
10-25 seconds after ignition before releasing the knob.
4) The burner will stay on now.
5) Repeat al steps again in case the burner directly
extinguishes.
Heat regulation of the heater
41, 61, 81 (F version):
The heat input of this heater can only be changed by adjusting the pressure of the gas supply. Check
the gas supply pressure information on the data plate of the heater for the minimum and maximum
values. If only one pressure per gas is mentioned, adjustment is not possible and only continuous
operation or on-off operation is allowed.
41, 61, 81 (FT version):
Make sure that the gas supply pressure remains constant at the value
indicated on the data plate. Adjust the heat input by setting the
thermostat knob at the desired value. Note that the temperature on the
ground will be several degrees higher than at the sensor. So, use the
setting on the thermostat knob as a rough guideline and always check
the real temperature on the ground
Extinguishing the heater
41, 61, 81 (F and FT versions):
Close the gas tap or the central gas supply. The burner will extinguish now. The thermocouple safety
valve will close within 60 seconds.
Visual examination of the flame
Check after every ignition (and also during regular barn inspection) if a heater still burns correctly. The
flame shall remain always under the burner gauze on the ceramic stone. The ceramic stone shall be
equal red/orange in high firing position after a pre-heating period of at least 5 minutes.
A burner does not operate well in case there is a (green)-blue cloud inside the reflector and under the
burner gauze. Or a (green)blue flame tongue is coming out the exhaust holes in the reflector. This is
only visible in dark conditions. Soot deposit on the reflector and yellow flames are also a sign of bad
functioning and are not allowed. Cleaning will solve these problems in most cases.
In case the burner makes a loud roaring noise and the burner ceramic does not become equal
red/orange but dark, the ceramic is damaged and the flame is burning inside the burner box (back firing).
Directly extinguish the burner and replace the damaged ceramic by a new one.
Version 1.0: March 2018
7
Approx. Temperature (T)
Δ = 15 °C
* = 20 °C
1 = 22 °C
2 = 28 °C
3 = 33 °C
4 = 36 °C
5 = 38 °C
manual number: 0009 0520EN