MovinCool Office Pro W20 Service Manual - Manual (Page 33)

Operation Section
33
7. CONNECTION AND SETTING
7.1 Warning Signal Connection (Output Signal Terminal L+ and L-)
• The controller is equipped with a warning signal output relay type (Form C, normal open dry
contact) which can be used to monitor the failure conditions.
Relay contactor is closed when any of the following conditions has occurred:
- Tank Full
- Temperature sensor fails
- High pressure switch error
• The relay output contactor is rated 2 A at 30 VDC or 2 A at 30 VAC (resistive load) and it is
compatible with various warning devices such as alarm speaker, light indicators, etc.
Connecting warning signal from controller
1 ) Remove service panel from the rear of the unit.
3 ) Insert the warning signal wire through the hole in the rear panel.
2 ) Squeeze the inner latches and push out the black cap from inside the panel. (See drawing of
cap and inner latch shapes.)
Use recommended warning signal wire size from 16 AWG to 26 AWG or a solid wire, or 16
AWG to 22 AWG for a stranded wire with ring terminal for #6 stud size.
4 ) Connect warning device to terminal L+ and L- according to its polarities.
ILL00078-00
<Cap>
Latch
Unit Terminal
Input Signal Relay Output Contactor
Warning Device
E+
E-
L+
L-
ILL00079-00