Service Manual

Page 45
ID
Component
Description
Measuring Wire Colors Value Remarks
1
Ionization electrode White wire to ionization
electrode
Multimeter in position for
current measurement, with
scale for µA range of values
Ionization current > 0.5
µA
Note: Cables connected
in series between
ionization cable from
control unit and
electrode.
2 Combustion fan
Brown-Blue GND
~ 0 – 45 V
DC
Supply power
Red-Blue GND
~ 10.8 – 13.2 V
DC
Control power
Yellow-Blue GND DC~V (pulse frequency ~ Hz) Feedback from hall sensor
7
Mechanically
modulated
valve (MV1)
Red-Black
~ 4 – 12 V
DC
Resistance ~ 80 Ω
Modulation Valve
12
Main safety solenoid
valve (SSV)
Black-Black
~ 20.4 – 24 V
DC
(open)
Resistance ~ 120 Ω
Inlet Safety Valve
10
Solenoid valve
(SV1)
Blue-Blue
~ 12 – 13 V
DC
Resistance ~ 105 Ω
Burner Manifold
Segment 1
11
Solenoid valve
(SV2)
Black-Black
~ 12 – 13 V
DC
Resistance ~ 105 Ω
Burner Manifold
Segment 2
9
Solenoid valve
(SV3)
White-White
~ 12 – 13 V
DC
Resistance ~ 125 Ω
Burner Manifold
Segment 3
Table 14 – Component Electrical Measurements and Values
Figure 37 – Gas Valve Solenoids
1 - Gas inlet 3 – Modulation valve (MV1)
2 – Safety valve (SV1)
4 – Outlet gas
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