LT-S-(L) Technical manual
Figure 10-10. Pressure Differential Switch
10.4
Electrical Accessory
10.4.1
INT69 HBY Diagnose Protection module
The INT69 HBY Diagnose protection module is developed for micro controller,
phase sequence and phase lack of the compressor.
Protection Module INT69 HBY Diagnose is an advanced product
microcontrollers for compressor-protection.
It can effectively extend the life of the
refrigeration system. INT69 HBY Diagnose automatically saves work and error data
in its memory. The data can be read on a personal computer and used for diagnostic
analysis through a specific transmission line.
Functional description
：
The series PTC thermistor enters the signal input side of the protection module
The protection module trips off if the resistance of any of the thermistors rises
above its trip value. The resistance of the PTC drops below the reset resistance.
After 5 minutes of reset time, the module is automatically reset. Within 24 hours
of the first trip disconnection, the second PTC resistance rises above the reset
resistance value and the reset time is 60 min. If the third PTC resistance rises
above the reset resistance within 24h, the module will lock up and cannot be
In normal case 1-2 is connected.
When pressure difference reaches set
point, 3-4 are connected.
When pressure difference is under set
point, push the manual reset button and
1-2 will be connected.
