Nortec MES2 - Manual (Page 23)

Installation | 20
Control Wiring
Figure 18: Control Wiring
24 VAC
On/Off
Safety Loop
Control
Signal
Cut-out
in cover
for wiring
Contactor
Tie wrap
wires to tabs
provided
Electrical Cover
(Enclosed electrical
models only)
Remote Fault
(NO)
Control (+)
Signal (-)
On/Off (Safety Loop) 24VAC
On/Off
Drain
Switch
24 VAC
P2
P5
P3
Fuse+Power Relay
Contactor
Mandatory Wiring:
1
,
2
3
Optional Wiring:
4
5
6
Use min. 18 AWG and keep as short as possible.
24 VAC to fuse connected to On/Off/Drain switch
and to power relay 0.25 in. spade connectors.
Ground wire from humidifier ground to air handler
ground.
On/Off/Safety input (24 VAC) input to point 2 of P3.
Modulating control input (0-10 or 2-10 VDC)to P5
(J10 must be removed for modulation).
500 ohm resistor between 1-2 of P5 for mA
modulating control input.
Remote Fault to P2.
Power Relay
Fuse
Contactor
Ground