20
Installation
Burner connection
(cont.)
Two−stage/modulating burner extension
The function extension is supplied with the boiler.
Max. power consumption
H
Two−stage:
1 (0.5) A
H
Modulating:
0.1 (0.05) A
Observe coding addresses 02, 10 to 13, 15 to 18, 1A, 26 and 29 (see overview).
A
To control unit
B
To burner
C
Junction box with relays
K1 and K2
Terminal codes
T6, T7, T8 Control chain
Burner
stage 2 or modulation
controller
(for two−stage
operation via two−point
controller; for modulating
mode via three−point
controller)
T6
From the burner
T7
Mod. burner closed
T8
Mod. burner open/
stage 2 ON
B
Signal pass direction:
Control unit
→
burner
Y
Signal pass direction:
Burner
→
control unit
Colour coding to DIN IEC60757
BK
black
BN
brown
BU
blue
5862700GB
C
B
A
