Herrtronic
®
MD Series
Installation, Operation, & Maintenance Manual
34 www.herrmidifier-hvac.com
(TR)
(TL)
(COM)
BLK
WHT
43
44
36
35
BLK
BLK
6
WHT
GRN
7
RED
3
37
45
4
5
8
9
10
11
WHT
BLUE
ORG
RED
WHT
GRN
J5
BOARD PIN NUMBER
TERMINAL
BLOCK
BLUE
ORG
WHT
WHT
WHT
WHT
ORG
BLUE
BLK
BLUE
BLK
WHT
26
27
12
17
18
19
20
33
22
47
46
21
X1
TRANSFORMER
480
230
208
0
BLK
BLK
32
31
GROUNDED
TO CHASSIS
BLK
BLK
29
30
BLUE
BLK
46
15
ORG
38
34
RED
BLK
BLK
BLK
36
35
25
BLK
BLK
BLK
RED
RED
BOARD PIN NUMBER
J1
POWER ELECTRODES
T3
T2
T1
L3
L2
L1
BLK
BLK
BLK
POWER ELECTRODES
RED
RED
TOROID
3
RED
BLK
BLK
BLK
CONTACTOR
GND
GND
BLK
BLK
BLK
POWER DISTRIBUTION
BLOCK
L1
L2
L3
L1
L2
L3
T1
T2
T3
(24 VAC)
(24 RET)
28
26
BLK
WHT
BLK
BLK
1
2
3
4
CYLINDER FULL
INTERFACE
14
BLK
14
BLK
RED
CYLINDER
FULL
ELECTRODE
J3
BLK
WHT
ORG
BLUE
WHT
WHT
17
21
23
18
49
19
20
13
DRAIN
VALVE
FILL
VALVE
22
47
WHT
ORG
4
25
BLK
ORG
1
3
4
2
5 7
9
11
6 8
10
12
1
3
4
2
5
7
9
11
6
8
10
12
6
5
2
4
3
1
44
43
5
6
7
8
9
10
11
16
WHT
BLK
WHT
WHT
GRN
GRN
RED
BLK
45
12
BLUE
BLUE
- RS-485
+ RS-485
39
40
AIR FLOW SWITCH
(OPTIONAL)
DOOR
INTERLOCK
TERMINAL STRIP 1
41
42
BLK
BLUE
TERMINAL STRIP 2
(RDU)
42
41
36
35
38
33
WHT
ORG
BLK
BLK
BLK
BLUE
BARE
MDS / MDM WIRING DIAGRAM
POWER INPUT
24
34
48
ORG
RED
RED
RED
49
48
2
1
NOTE:
POWER DISTRIBUTION BLOCK
NOT USED ON SINGLE
CONTACTOR UNITS.
RED
RED
RED
RED
THESE WIRES NOT
USED ON SINGLE
CONTACTOR UNITS
THIS WIRE NOT
SUPPLIED ON
1 PHASE UNITS
WIRE #32 CONNECTED
TO INCOMING LINE
VOLTAGE LEG OF
TRANSFORMER
THESE WIRES NOT
USED ON SINGLE
CONTACTOR UNITS
G
H
O
N
M
A
B
C
V
W
X
BLK
BLK
BLK
O
N
M
ORG
51
BLUE
52
(NO)
(1)
CONTACTOR
(2)
153
TERMINAL STRIP 3
REMOTE ALARM
29
BLK
30
(TL)
BLK
(TR)
BLK
240
480
YEL/WHT
ALTERNATE TRANSFORMER
120
0
(24 VAC)
BLK
14
TERMINAL
BLOCK
YEL/WHT
BLK
27
BLK
277
27
YEL
2
1
6
4
8
53 7
10
12
9
11
WHT
ORG
BRN
GRAY
54
24VAC, 4 VA MAX.
TERMINAL STRIP 4
BLK
WHT
55
-
+
54
55
WHT
BLK
XF
X2
X3
11
10
9
6 875
4
32
1 1
32 65
4
7 8
10
9
11
1
32 65
4
7 8
10
9
11
BOARD PIN NUMBER
RED
ORG
ORG
I
CONTROLS
FUSE 2
(2A)
FUSE 1
(2A)
FUSE 3
(4 A FOR 100 VA)
A B
VARISTOR
V3
VARISTOR
V2
VARISTOR
V1
VARISTOR
V4
(6 1/4 A FOR 150 VA)
FUSE 1
(2A)
FUSE 2
(2A)
CIRCUIT
BREAKER
ALTERNATE CLASS 2
TRANSFORMER WITH
FLYING LEADS AND
CIRCUIT BREAKER ON
SECONDARY (24V)
SIDE
TRANSFORMER LEAD
CORRESPONDING TO INCOMING
LINE VOLTAGE IS CONNECTED
TO FUSE 1. UNCONNECTED
TRANSFORMER LEADS MUST BE
SEPARATELY INSULATED.
GROUND WIRE #153 IS NOT USED WITH ALTERNATE CLASS 2 TRANSFORMER
IF FUSE 3 IS MOUNTED ON TRANSFORMER,
WIRE 28 IS OMITTED AND WIRES 14, 27, &
54 CONNECT TO TRANSFORMER TERMINAL XF
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