Additional information
139
Wiring diagram
(continued)
120 V~ motherboard
(continued)
sÖ
Heating circuit pump
or
control output
sA
Circulation pump for heating the
DHW tank (accessory)
sK
DHW circulation pump (installed
on site)
sL
Shunt pump (installed on site)
fÖ
Mains connection, 50 Hz
fA
Oil/gas burner,
connection to DIN 4791
gÖ
Central fault indicator (installed on
site)
gS
Mixing valve motor for return
temperature control
or
3-way mixing valve for DHW tank
loading system
lÖ
Burner (2nd stage/modulating)
aBÖ
External equipment
a
External safety equipment
(remove jumper when
connecting)
b
External disable (remove
jumper when connecting)
c
External burner switch-on
(1st stage)
aBA
Safety circuit, potential free
aBH
Mains connection for accessories
F1, F2 Fuse
F6
Fixed high limit ”
E
” 110°C
(99°C)
F7
Adjustable high limit ”
R
” 95°C
K1-K10 Relay
S1
Heating system on/off switch
”
8
”
S2
TEST button
5285
941
-
0
1
