Sanyo MINI ECO-i XHX1252 Service Manual & Test Run Service Manual page 166

1. Outdoor Unit Control PCB
CN15
CN50
CN33
CN028
The control operations that are shown below are when you short-circuit this cooling inspection
pin located on the outdoor unit control PCB.
1.Thermistor inspection
Thermistor
Discharge temperature (TD)
Outdoor temperature (TO)
Heat exchanger temperature (C1)
Heat exchanger temperature (C2)
Air inlet temperature (TS)
2. Turn ON the four-way valve for one second
3. Forced cooling operation
This pin is used to perform automatic address while operating the compressor. Normally,
automatic address can be performed in Heating mode, short-circuit this pin to perform
automatic address when operation is in Cooling mode.
3P plug (black): Terminal plug of the communications circuit
• A connecting socket (2P, black) for short circuiting is attached to the terminal plug at the
time of shipment from the factory.
• When multiple systems are operated in centralized control, leave the connecting socket in
place at only 1 of the outdoor unit in system address, and then replace the socket 2 to 3
from the outdoor unit (other than 1). If multiple connecting sockets are left in place while
operated in centralized control, communications trouble will occur.
• When there is only single (system address 0) connecting socket of 1 system, do not remove
the connecting socket. (It is for the warning "
2P plug (white): Silent mode operation pin
• Operates the outdoor fan and compressor frequency with a limitation.
• When relay turns ON, operating noise becomes low.
Relay
(field supply)
Silent
CN028
Outdoor unit control PCB
Note 1: Make the length of the wire between the outdoor unit control PCB to Relay within
6-9/16 ft.
• 2P socket with lead wire (Service parts: Parts code/623-161-2098)
• Relay field supply contact input specification DC5V and 0.5mA
(Recommended relay; The Fuji Electric Co. /HH62SW nano-contact point
correspondence)
• Use commercially available timer. (Omron "H5" daily time switch, etc.)
Detection results
Normal
LED1 lights up
LED2 lights up
LED1 lights up
LED2 lights up
LED1 lights up
".)
Power
source
External contact
(Timer input, etc.: field supply)
4-4
PCB and Functions
Error
LED1, 2 turns off