York R-410A, Technical & Service Manual, Page: 294 / 385

Controller
___________________________________________________________________________________
- 293 -
2. Check, the check procedure is as follows:
3. CN14
，
Low pressure protection
（
L-PRO
）
, Check with +5vweak electric signal;
4. CN13 High pressure protection H-PRO, Check with +5vweak electric signal;
5. CN12
，
Inter-communication between indoor and outdoor units, RS-485 signal (COM).The
digital pipe will display “E2” malfunction when the indoor and outdoor units can’t communicate
for 1 minute.
6. Current protector, the one–phase current of fixed-speed compressor will pass this current
protector and when the current is more than 16A, it will cut the power supply immediately to
protect the compressor.
7. Current protector, the one–phase current of digital scroll compressor will pass this current
protector and when the current is more than 16A, it will cut the power supply immediately to
protect the compressor.
8. CN11
，
Discharge temperature sensor of digital compressor COM.PIPE
）
, which inside in the
digital compressor, the relevant temperature to sensor please see the appendix 2. If the
discharge temperature is more than 140
O
C, the compressor and all of the system will stop and
restart until the malfunction is eliminated.
9. CN6
，
Three-phase power supply input
，
only check the phase-sequence or loss-sequence
for the first time power on. The digital pipe display “E1” when first power on, the system will
recover until there is no phase-sequence or loss-sequence occur. If there is no phase-sequence
or loss-sequence occur for the first power on, the system will not check the phase-sequence or
loss-sequence until power on over again.