Alde Compact 3010 Service Manual - Page 4
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THE LPG BOILER
Starting
When the gas heater receives the signal to start, the system
commences with an auto-check period in which the fan starts
up at constant voltage and works at a speed of about 3000 rpm.
If the speed is within the tolerance at the end of the period, a
spark is generated, the solenoid valve opens the first step for
gas, and the speed of the fan reduces to 2150 rpm. When the
burner ignites, the electronics receive a signal via the sensor,
the ignition ceases and the burner burns at step 1 for at least
one minute before going over to the second power step if the
need for heat so requires.
If the burner does not ignite within 10 seconds after the gas
valve has opened, the attempt to start is discontinued and a
new cycle commenced. If this also does not succeed, no further
attempts to start will be made, and the text "GAS OUT" will be
shown in the panel. In order to reset the boiler, gas must be
shut off on the panel and switched on again.
Operation
When the burner is working, the flame is monitored via the
flame sensor pin. If the flame goes out, the signal from the
sensor is broken and the gas supply is shut off within 1 second.
After that, the heater attempts to start in accordance with the
description given above.
The burner fan speed is also continuously monitored when in
operation. At step 1, the fan speed is 2150 ±250 rpm and at
step 2 it is 3200±250 rpm. If the fan speed goes down to less
than 2950 rpm, the heater changes down to step 1, and if the
fans speed slows again so that it is below the permitted speed,
the heater is completely switched off and the text "FAN" is
shown in the display. In order to reset, it is necessary for the
main current to the boiler to be broken and then switched on
again.
Changing between power steps
The heater always ignites at step 1. In changing from step 1 to
step 2, the fan speed increases from 2150 to 3200 rpm over in
2.5 seconds. When the fan speed exceeds 2600 rpm, the gas
valve opens for step 2, while step 1 is kept open all the time.
In order to open the gas valve's step, the electronics send 12
volts to each respective coil's opening circuit for 1 to 2 seconds.
After this, the valve is kept open using the holding circuit. The
opening circuit has a current consumption of about 1.5A, while
the holding circuit's current consumption is only about 0.05A.
Regulation
The temperature in the vehicle is regulated with respect to the
difference between the actual temperature within the vehicle
and the required temperature set in the panel (Δt).
If electricity of 3kW + gas has been selected, the heater regula-
tes as follows:
Δt
Function
+0.7°C Pump 33 % El. 1 kW
+0.5°C Pump 66 % El. 2 kW
+0.0°C Pump 100% El. 3 kW
-0.5°C Pump 100% El. 3 kW Gas step 1 33%
-1.0°C Pump 100% El. 3 kW Gas step 1 66%
-1.5°C Pump 100% El. 3 kW Gas step 1 100%
-2.0°C Pump 100% El. 3 kW Gas step 1 100% step 2 33%
-2.5°C Pump 100% El. 3 kW Gas step 1 100% step 2 100%
If, for example, only gas has been selected in the panel, the
step for electricity goes out and gas step 1 33% comes in at
the top of the regulation.
The maximum radiator temperature when the circulation pump
is running is 82ºC. When the circulation pump stops, the maxi-
.
mum temperature is 75ºC
Warm water
The heater continuously keeps warm water at a basic tem-
perature of about 50ºC. If the temperature goes down below
this level, the heater increases power to a level in accordance
with the control steps above. This may mean the temperature
rising somewhat within the vehicle, which in turn means that
the pump stops and the heater goes over to only generating
warm water for a period of time.
If there is no need for heat, but the boiler is only working to
generate warm water, the heater works on the electrical power
selected; if only gas has been selected, the heater works at
gas step 1.
Fresh water
connection OUT
Electrical heating
cartridge 2kW
Fresh water
Electrical heating
connection IN
cartridge 1kW
:
TECHNICAL DATA
Measurements:
Height
Boiler size:
305 mm
Rec. Min. installation
dimensions.
310 mm
Weight:
14 kg (without liquid)
Gas:
Propane
Output step 1:
3,3 kW
Consumption:
245 g/h
Output step 2:
5,5 kW
Consumption:
405 g/h
Gas pressure
I
28-30/37 mbar
3+
I
3B/P
Liquid volume/Pressure
Liquid volume, glycol mix:
Liquid volume, fresh water:
Max pressure, heating system:
Max pressure, fresh water:
System temperature:
0 V ~
Output element :
(2 or alternatively 3 kW)
1 V DC
Current consumption:
Fuse:
Glycol mixture
Electronics
OUT
Burner fan
Solenoid valve
Glycol mixture IN
Width
Length
340 mm
490 mm
400 mm
500 mm
Butane
3.8 kW
275 g/h
6,4 kW
460 g/h
30 mbar
3,5 liter
8,4 liter
0,05 MPa (0,5 bar)
0,3 MPa (3,0 bar)
max 85°C.
1 x 1050 W
1 x 2100 W
1 amp (max)
3,15 amp+/3,15 amp-