York R-410A, Technical & Service Manual, Page: 300 / 385

Controller
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14. CN3
―
PUMP
220 V output. When indoor unit starts to cooling operation, the pump starts at once and
running continue until stopping this mode. At any time, if the water-level in the water receiver
raises to the position point of the water-level switch, that is, the water-level switch signal is cut
down, the pump will start at once and forced running. If the water level falls to below the alarm
water-level (the drain pump delay 1 minute to be off), operation recovers according to former
setting mode. On the otherwise, after 3 minutes, indoor unit stops (Including pump) and display
water-level alarm signal, and indoor unit takes part in the whole system operation according to
standing-by mode. When again checking the water-level alarm signal is off, the protection will
be released and recover operation according to former setting.
15. CN2
―
Power input 220V (L, N)
16. CN4
―
Indoor Fan output
220 V output. There are four relays in the electric control board and four-speed output
(High/Middle/Low/breeze). The Low speed and Breeze speed have been short-connected, and
the indoor breeze speed have been deleted, so even the relay of breeze speed suck-in, the
indoor fan motor still operates in Low speed. That is, all indoor units have only three fan speeds;
even operate in Low speed in heating anti-cooling and oil-return period
17. CN11
―
Transformer output (TRANS OUT)
16 V AC output. Input 220V AC to transformer, then output 16V AC, and then input to the
electric board. There are two commute filter circuits, one is 7805, output 5V to the chip, the
other one is 7812, output 12V to 2003 and relays.
18. CN5
―
Water-level switch (WATER)
Disconnect when full of water and be close when water level recovers normal. For indoor
units without water-level switch, this switch needs be short connected.
19. CN7
―
Evaporator outlet temp. (T2B)
20. CN6
―
T1, T2
21. S2
―
Address setting (for CCM)
This setting presents the address relative to a CCM, match with S1 switch, the address range
is 0-63, Before using a CCM to group control indoor units or using YDS Intelligent Network Air-
Condition Control& Monitor System to control indoor units, the address setting must be finished
and the address setting of indoor units that match with the same CCM can’t be repeated.