Accorroni MEC25-85 Technical Information page 20

1.11 WIRING DIAGRAM MEC 25
[b]
1
[n]
Ef2
2
[m]
3
M1
L N 1a N
J1 J2
L N SB RS
NC
P
L
J22
N
J21
SB
J20
RS
J19
J18
Op
Ac = Control equipment
Br1 = Burner
Br2 = Second burner (MEC 85)
C1 = Fan motor condenser
C2 = Flue exhaust motor condenser (MEC 85)
Cs = Printed circuit board
Ea1 = Ignition electrode
Ea2 = Br2 ignition electrode (MEC 85)
Ef1 = Flue exhaust motor (MEC 25-57)
Ef2 = Flue exhaust motor (MEC 85)
Er = Flame detection electrode
Ev = Gas solenoid valve
Fr = Radio interference filter
M1 = Ef2 connection terminal boards (MEC 85)
Mvc1 = Centrifugal fan motor (MEC C 25-85)
Mvc2 = Centrifugal fan motor (MEC C 50-85)
Mvc3 = Centrifugal fan motor (MEC C 85)
Mve1 = Axial fan motor (MEC 25-85)
Mve2 = Axial fan motor (MEC 50-85)
Mve3 = Axial fan motor (MEC 85)
C2
1a N N 1a N 1a
J4
J3
Tr
Ts1
NO
Ef1
C
Ts2
Ev
T v
K3 K1 K2
R3
R1
2 1
Sb Rs
3
N
L
[g/ v]
[b]
[m] [ n]
J27 J26 J25
ELECTRICAL SCHEMA FOR AXIAL FAN
Er
Ea2 Ea1
Br2 Br1
common
J23 J25
C1
condenser
[m]
J26
J24
Mve1
max.
J27
R2
J28
J29
Cable colors
J30
J31
J32
J33
J34
J35
J36
3 (U)
N
L
1 (U)
Cs
Op = Jumper for auxiliaries
P = Differential pressure switch
R1 = Fan relay (MEC C)
R2-R3 = Fan relay (MEC C / MEC 85)
Rs = Reset button
Sb = Lockout signal
Tr = Br2 ignition transformer (MEC 85)
Ts1 = Safety thermostat
Ts2 = Second safety thermostat (MEC 85)
Tv = Fan thermostat
ATr = Autotransformer
= Fuse
- - - - - = Connection to be made
= Series connection
= Varying connection (model depending)
Warning:
- Install an omnipolar switch with a contact opening of at
least 3 mm.
- The 230 V ~ 50 Hz single-phase power supply must be
connected according to the phase-neutral polarity.
page 17
Ac
ATr
L M M 1 2 3 4 5 6
[n]
[b]
[b] = blue
[bi] = white
[g] = yellow
[g/v] = yellow/green
[gr] = grey
[m] = brown
[n] = black
Fr
230 V ~
(4)
N
50 Hz
L
(2)
Fig. 10