SKG3 Gas Fired Humidifier
Installation Instructions and User Manual
31
Stage 9 – Electrical Control Connections
Electrical Control
Connections
The Neptronic® SKG3 Steam Humidifier has a modulating control system and
requires an analog control signal.
All controls connections have been grouped on a specific Interface P.C.B.
Electrical Control connection interface - Fig. 41
Humidifier
Interlocks
The Neptronic® SKG3 Steam Humidifier has three interlock entries:
Interlocks connections - Fig. 42
High level humidistat
contact must be wired between terminals TB1 2 & 3.
If this contact is open, operation of the humidifier will stop and an
Alarm
message will be displayed.
P.D. Switch
contact must be wired between terminals TB1 2 & 4.
If this contact is open, operation of humidifier will stop.
No Alarm
message will
be displayed.
A third interlock
switch can be wired between terminals TB1 2 & 5.
If this contact is open, operation of humidifier will stop and an
Alarm
message
will be displayed.
TB1
Interlock and control signal Terminal
DS1
Dip switch for adjustment of RS-485
No effect on SKG3 Humidifier operation
P1
RS-232 Connection
TB3
RS-485 Connection
Bacnet Port (2 wires twisted pair)
JP1 & JP2
Internal connectors
1
3
2
4
5
6
7
8
9
1
2
3
4
5
6
1 2 3
R
-
R
+
L
A
S
T
ANLG OUT
1
2
3
4
5
X
6
7
8
9
DUCT
HUMID.
ROOM
HUMID.
CTRL
DEMAND
INTER
LOCK
PD
SWITCH
HI-LIM
24 VAC
700MA
MAX.
TB1
TB2
J
P
2
J
P
1
DS1
O
N
P1
RS-232
A
+
B
-
TB3
RS-485
COM
NO
NC
COM
NO
NC
ALARM
FAN
TB2
Alarm contacts Terminal
HI LEVEL HUMIDISTAT
P. D. SWITCH
OTHER SAFETY INTERLOCK
2
4
V
A
C
-
7
0
0
m
A
m
a
x
1
3
2
4
5
6
7
8
9
1
2
3
4
5
6
1 2 3
R
-
R
+
L
A
S
T
ANLG OUT
1
2
3
4
5
X
6
7
8
9
DUCT
HUMID.
ROOM
HUMID.
CTRL
DEMAND
INTER
LOCK
PD
SWITCH
HI-LIM
24 VAC
700MA
MAX.
TB1
TB2
J
P
2
J
P
1
DS1
O
N
P1
RS-232
A
+
B
-
TB3
RS-485
COM
NO
NC
COM
NO
NC
ALARM
FAN
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