Nortec MH Series - Manual (Page 31)

Installation | 28
On/Off Control Wiring
Figure 26: On/Off Controls
Figure 27: Digital On/Off Humidistat
Note: 1
2
3
MH will run when circuit between
terminal 1 and 2 on MH is closed.
Terminal 1 is 24VAC Hot, turn unit off to
avoid shorting while wiring.
Digital Humidistat requires 24 VAC power
from terminals 1 and 3 of MH.
Humidifier Terminal Strip
Air Proving
Switch
On/Off Humidistat
2548731 - On/Off Wall Humidistat or,
2548732 - On/Off Duct Humidistat
OR
1 -
G
rou
nd
2 -
2
4
V
A
C
3 -
C
om
m
on
4 -
D
igi
tal
O
ut
8 -
N
T
C
S
en
s
or
7 -
N
T
C
S
en
s
or
Air Proving Switch
Wire to make when
sensing air flow
M
H
E
X
T
Connect 24 VA C,
terminal 1 of MHTC to
terminal 2 of controllers.
N/
O
Co
m
1- 24 VAC
2 - On/Off Loop
3 - Ground
4 - Control Signal
5 - N/A
6 - +5 VDC
7 - Ground 1
2
3
4
5
6
7
On/Off Humidistat
2548731 - On/Off Wall Humidistat or
2548732 - On/Off Duct Humidistat
OR