9
6.4 Specification control box
Control box
: Satronic DKG 972-27
Mains supply
: 230 V – 50 Hz
Minimum ionisation current
: min 3 µA (DC)
Reaction time flame protection : 1 sec.
Safety time
:
≤
10 sec.
Maximum ambient temperature : 60 °C
Injector size pilot burner
: Ø 0.5 mm
Injector size main burner
: Ø 4.0 mm
Burner pressure full load
(high calorific gas)
: 14.0 mbar (100%)
Burner pressure part load
(high calorific gas)
: 5.0 mbar (60%)
Start repetitions
: 5x
Warning
: control box is phase / neutral sensitive.
6.4.1 Specification Ignition transformer
Ignition transformer:
Satronic ZT. 870
Ignition voltage:
16 kV
Distance electrodes:
3,5 ± 1 mm.
6.5 Functions
6.5.1 General
The following functions (standard and optional) will,
when activated, either lock out or shut down the boiler.
For all options full fitting instructions are included in the
option pack.
6.5.2 Flame control (lock out)
The flame is monitored using ionisation flame detec-
tion. In the event of a flame failure the boiler will lock
out. Manual intervention is required to reset the boiler
(on the control box) once the cause of the problem has
been rectified.
6.5.3 Thermostats (shutdown / lock out)
-
Control thermostat On/Off: shutdown (35°C-95°C);
The boiler will automatically resume operation when
the flow temperature falls below the set point.
-
Control thermostat High/Low: shutdown (35°C-
95°C);
The boiler will automatically resume operation when
the flow temperature falls below the set point.
-
High Limit thermostat: lock out at 110°C;
The boiler will lock out. Manual intervention is
required to reset the boiler (on the instrument panel)
once the cause of the problem has been rectified.
6.5.4 Water pressure switch - optional (shut down)
The boiler can be fitted with an optional water pressure
switch. If the water pressure drops below the set value
(0.8 bar), the boiler will shut down. When the water
pressure returns to 1 bar, the boiler will resume opera-
tion again.
Type: SIT
340
6.5.5 Gas pressure switch LD - optional (shut down)
The boiler can be fitted with an optional gas pressure
switch LD. If the supply gas pressure drops below the
set value (12 mbar; for natural gas
only), the boiler will
shut down. When the supply gas pressure returns above
this set value the boiler will resume operation again.
Type: Dungs
GW50
A5.
6.5.6 Down draught thermostat - optional (shut
down)
The boiler can be fitted with an optional down draught
thermostat. When the temperature in the draught divert-
er rises above the down draught thermostat set point,
the boiler will shut down. It automatically resets after 3
minutes, provided that the temperature also falls.
Type: Honeywell L6068A; fixed set point is 70°C.
7
ASSEMBLY AND INSTALLATION GUIDELINES
7.1 General
The boiler is suitable for operating at a maximum work-
ing pressure of 6 bar. It can be installed in open vented
system with a minimum pressure of 0.3 bar or in sealed
system with a minimum pressure of 0.8 bar.
7.2 Boiler
assembly
The boiler is supplied with full assembly instructions. On
request special assembly tools can be hired from Broag
on a daily basis. However, Broag (or a Broag approved
boiler erection engineer) can provide boiler assembly
services and / or building supervision.
7.3 Water
connections
The boiler water connections (2” male thread) are fitted
at the rear of the boiler (right hand connections only).
The two sections have a ¾” BSP tapping, the right hand
end section to accept a drain/off cock and the left hand
end section to accept a plug.
7.4 Pocket the thermostat capillaries
The multi pocket for the thermostat capillaries is fitted in
the flow connection of the boiler.
7.5 Water
pressure
Each section is hydraulically tested at 10 bar. Operating
pressure between 0.3 and 6 bar. The boiler can be fitted
with an optional water pressure switch, set at 0.8 bar.
