27 | Installation
Remote Fault Option Wiring
The NHTC (not NHPC) remote fault option includes 4 relays that can provide remote status
indication. The relays are mounted to a remote fault board which is located as shown in Figure
28: Remote Fault Wiring. The PCB with the relays includes markings which indicate the function
of each terminal on the board. The relays indicate the following status;
1 Unit On – The normally open relay is closed when the humidifier has power and the On/Off
switch is set to on.
2 Steam – The normally open relay is closed when the control board detects that the cylinder
is drawing current and steam is being produced.
3 Service – The relay can be wired to open (NC) or close (NO) when a warning is displayed on
the humidifier display and the yellow service LED is illuminated.
4 Error – The relay can be wired to open (NC) or close (NO) when a fault is detected by the
humidifier controls.
Figure 28: Remote Fault Wiring
Steam
Unit ON
Error
Service
NO
COM
NO
COM
NO
COM
NC
NO
COM
NC
Location on NHTC 050-200
Location on NHTC 005-030
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