Kentatsu KRFN1050CFAN3, Service Manual

Page: 112 / 128

Kentatsu Rooftop KRFN
112 Installation
9. Safety control
Functions

Minutes delay for the compressor start-up:
At the beginning of energizing, 3-minutes delay should be taken to start the compressor. While
after the stop of the compressor, 7-minutes delay should be taken to restart the compressor.
 Compressor discharge temperature protection:
When the temperature of compressor discharge is higher than 125°C (257°F), the compressor
will stop. Once the temperature is lower than 90°C (194°F), the compressor can be started
again.
 Reverse phase protection relay:
The reverse phase protection relay will make the unit not start, when the power supply source is
in correctly conneted.
The checking of phase order is just carried out at the first time of electrifying. If malfunction
happens then the checking will be going on until the order of phase is right, and the error code
will be displayed on the board. If there is no problem in the first checking, then it will be omitted.
 High pressure and low pressure protection :
When high pressure is equal or higher than 638 Psi, and lower pressure is equal or lower than
21Psi, the unit will stop.