13
Page Chapter
13
1:0
How the boiler is constructed
13
1:1
Technical data
13
2:0
How the boiler works
13
2:1
The functions of the control panel
14
2:2
Starting the LPG boiler
14
2:3
Shutting down the LPG boiler
14
2:4
Setting for maximum comfort
14
2:5
Setting the room temperature
14
2:6
Circulation pump
14
2:7
Electrical heating
14
3:0
External start
15
4:0
Water heater
15
5:0
Maintenance of the heating system
15
5:1
Bleeding the heating system
15
6:0
Useful facts about LPG
16
7:0
Troubleshooting
16
8:0
Guarantee
Read these instructions carefully before you use the boiler.
The instructions for use are approved in accordance with
CE no. 048 AO-0007 for LPG boiler type 2928.
Data plate and production number are located inside the
metal shell beside the expansion vessel.
1:0 How the boiler is constructed
The boiler operates with what is known as constant
temperature, i.e. there is always heated liquid in the boiler
to circulate in the system when the room thermostat calls
for heat. In other words there is no time lag when heat is
most needed.
From an air intake on the roof flue terminal, the combustion
air is passed through an aluminium hose into the
combustion chamber. The gas valve and the burner
assembly are attached to an easily removable plate
screwed to the combustion chamber at the bottom of the
boiler. The water jacket, which consists of an inner and
an outer pipe, is located above the combustion chamber.
The space between these pipes constitutes the reservoir.
Inside the inner pipe there is a flame damper which
consists of a folded sheet of metal. Its task is to convey
the hot exhaust gases from the burner out towards the
water jacket so that the water is heated. From the top of
the water jacket, a pipe goes up to the expansion vessel.
In the expansion vessel there is a 12-volt pump which
circulates the heated liquid in the system. On the front of
the boiler is the control panel with thermostat knob, cut-
out, power intake and changeover switch. At the top of
the boiler there is a terminal block for making the electri-
cal connection to the boiler. Beside the boiler, a ventila-
tion duct is attached that takes in fresh air from outside
and conveys it into the boiler but outside the combustion
part itself. The fresh air is heated by the body of the boiler
and convected through the ventilation grille in the front
panel out into the room.
1:1 Technical data
Gas:
Propane
Butane
Power:
5,8 kW
6.7 kW
Gas consumption: Max 420 g/h
Max 480 g/h
Gas pressure: I
3+
28-30/37 mbar, I
3B/P
30 mbar.
Liquid volume (glycol water) in boiler: 2.6 l.
Liquid volume (glycol water) in immersion heater: 1.0 l.
System temperature in the boiler: 35-75
°
C
2:0 How the boiler works
When the room thermostat calls for heat, the circulation
pump starts. The liquid in the system starts circulating,
and cold water comes into the boiler. The sensor on the
water jacket senses that the water is colder than the
temperature set on the boiler thermostat. The main bur-
ner ignites and heats up the water that circulates round
the system. When the heat inside the vehicle has reached
the temperature set on the room thermostat, the
circulation pump stops. The sensor on the boiler senses
that the water has reached the temperature set on the
boiler thermostat. It shuts off the main burner and goes
down to a pilot flame. When the water temperature has
fallen a few degrees in the boiler, the main flame is lit
again. In this way there is always heated water when the
room thermostat calls for heat.
2:1 The functions of the control panel
(fig 1)
A. Normal position for immersion heater. The heating ele-
ment is controlled by the room thermostat.
B. Constant position for the immersion heater. The heating
element is controlled by the immersion heater’s ther-
mostat. The changeover switch should be in this posi-
tion when the water heater is in use.
C. 1000 watts power on the immersion heater.
D. 2000 watts power on the immersion heater.
E. 240-volt circulation pump on the immersion heater.
F. 12-volt circulation pump on the boiler.
G. Normal position for 12 and 240-volt circulation pumps.
The selected pump starts and stops as indicated by
the room thermostat.
H. Constant position for 12 and 240-volt circulation pumps.
The pump runs constantly and the room temperature
is regulated by the boiler’s thermostat knob, in that the
boiler’s system temperature is adjustable. The constant
position uses for example when there are many per-
sons in the caravan. If one sits near the room thermo-
stat it can switch the circulation pump off, with cold
areas near the windows and floor as a result. In this
position the pump is constantly on and coldness is
avoided.
I. Cut-out 1 A fuse.
J. Power intake 12 V DC auxilary sockel (used for external
start etc. See chpt 3:0).
K. Warning light for ignition spark.
L. Thermostat knob.
GB