40
120V / 60 Hz / 1 ph
L
X1-2 MAINS
X3 MAINS GND
w
P
g
F
HV
1 kohm
X1-4
X1-5
g
w
w
w
w
bk
bk
bk
g
X1-6
X1-1
X15-2
X15-1
X6-3
X6-2
X6-1
FS1
I
OT
SE
X7
X11-6
X11-5
X11-4
X11-3
X11-2
X11-1
o
r
o
r
p
bk
bk
CN1-1
CN1-2
CN1-3
CN1-4
CN3A-1
CN3A-2
CN3A-3
CE8|TBT
TBT
y
CE4|+
r
bk
o
+
B
A
_
X14-1
X14-3
X14-5
X14-4
+
B
A
o
bk
y
r
REC10
DISPLAY
bl
r
bl
r
gr
gr
br
X9-1
X9-2
X9-3
X9-4
X9-5
X9-6
RS
SS
APS
FS
MAINS X1-3
MAINS
MAINS
w
X11-5
X11-6
N
bk
w
r
bk
bk
bk
w
g
bk
bk
A K M 1 1
B E 2 1
GV
M3
M4
M4
M3
M8
M8
M8
g
M8
g
M3
NOTE 2
CE8|R
CE8|C
CE8|W
NOTE 1
W
R
C
FU
NOTE 3
M8
bk
w
bl
wire line type
factory wiring
field wiring
R
Room thermostat 24 VAC
C
Common
W
Room thermostat heating
GV
Gas valve
P
Pump
F
Fan (blower)
HV
High voltage
I
Ignitor
FS1
Flame sensor
OT
OpenTherm (OTbus)
SE
Outdoor temp. sensor
TBT
Low temp. limit
thermostat
+ B A -
Bus 485
RS
Return sensor
(thermistor)
SS
Supply sensor
(thermistor)
FS
Flue sensor
APS
Air pressure switch
TF
Thermal fuse
WHL
Water high limit
MOD
Gas valve modulator coil
PT
Pressure transducer
DHWT
Domestic hot water temp. sensor
FM
Flow meter
FPWM
Fan PWM signal
3W
3 way stepper valve
COMPONENTS LABELS
AKM11
Main board
BE21
24 VAC Thermostat
REC10
Control interface
M3-M4
Mains terminal strip
M8
Multi-clip ground plate
CE8-CE4
External links connectors
FU
Fuse
X19-8
X19-7
X19-6
X19-9
r
p
bl
gr
r
bl
y
w
X12-4
X12-3
X12-2
X12-1
3W
FPWM
X13-4
X13-3
X13-2
X13-1
X19-5
X19-4
X19-3
PT
br
bl
bk
X19-2
X19-1
gr
gr
MOD
M
P W M
1
0
wire color code
bk
black
w
white
bl
blue
br
brown
r
red
g
green
y
yellow
p
pink
v
violet
o
orange
gr
grey
Notes:
1. Remove jumper to connect 24VAC thermostat.
2. Remove jumper to connect TBT.
3. Fuse 4A T.
w
w
X25-1
X25-2
CN2-1
CN2-2
CN2-2
CN2-1
bk
_
CE4|B
CE4|A
CE4|-
CE8|TBT
CE8|SE
CE8|G
CE8|OT
CE8|G
DHWT
FM
r
r
bl
o
v
X19-10
X9-10
X9-9
w
w
bk
bk
t
WHL
THE
TF
THE
Thermostat Heat Exchanger
Family PRO 42 KIS - Combi Model
9.2
Ladder diagram
Summary of Contents for Family PRO 42 IS
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