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We reserve the right to make any changes due to technical modifications!
Installation and Servicing Instructions Logamax plus GB142-24/30/45/60 • Version 12/2004
Buderus Hydronic Systems • http://www.buderus.net
Electrical connections8
Fig. 25 Electric circuit diagram
38
39
62
70
55
61
11
12
13
14
2
4
3 2 1
1 2 3
1
2 3
P
6 7
5
41 2 3
1 2 3
5
6
L
N
PE
L
N
5
M
120
VAC
1
4
5
53
79
23
67
68
69
76
12
13
14
45
17
49
10
11
28
1
81
27
52
25
3
4
7
80
9
44
16
1 2
651 2 3 4
L
N
120 VAC
4
3
2
1
5
4
3
2
1
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
3
2
1
4
3
2
1
58
1
54
51
46
19
77
26
63
64
75
74
36
37
58
57
33
60
35
8
43
34
16
15
8
1
15
16
13
1
Pin 1
28
55
Pin 81
Pin 16
Pin 1
KIM
120 VAC
120 VAC
24 VAC
120 VAC
0 VAC
24 VRAC
24 VRAC
230 VAC
10 VAC
10 VAC
230 VAC
651 2 3 4
6 7 851 2 3 4
57
2
PK PS PZ Grid
61 63 24 25 13 14 N L
PE N L PE N L PE N L PE N L
53
79
23
PE
L
N
PE
L
N
Fan unit
Gas burner
fitting
Transformer
Hot
surface
ignitor
16-pole connector
(120 VAC)
81-pole connector
(AC 0, 10, 24 and 120 V)
81-pole connector
16-pole connector
Connection box UBA 3.0
Ionization
Earth
Pressure
sensor
Return sensor
Safety-temperature sensor
Supply sensor
Operating switch
Earth
120 VAC
Function module
Mains supply
120 VAC 60 Hz
Circulating pump
120 VAC, max. 100 VA
DHW circulator
120 VAC, max. 100 VA
Boiler circulator
120 VAC, max. 100 VA
External connection for specialist servicing company
External switch contact
Potential-free e.g.
for floor heating
DHW sensor
On/Off temperature
control, potential-free
Outdoor-temperature
sensor
Modulating room controller
BC10 connector
Bus
Function module
External 3-way valve
orange blue green grey red
white
whitegreen grey
lilac
120 VAC
Function module
3
212121212121
RC FA WA FW EV DWV
WARNING
Label all wires prior to disconnection when servicing.
Wiring errors can cause improper and dangerous operation.
26


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