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Mini ECO-i System

PCB and Functions

Indoor Unit Control PCB Switches and Functions

Indoor unit control PCB

T10:

6P plug (yellow):

Used for remote control. (Refer to the remote control section.)

(CN061, 015) Control items:

(1)

tart/stop input

(2) Remote controller prohibit input

(

)

tart signal output

(4) Alarm signal output

Examples of wiring

(1) Relay junction PCB (ACC-DC24A)
(2) Power OFF reminder

EXCT:

2P plug (red):

Can be used for demand control. When input is present, forces unit to operate with

(CN07

, 009) the thermostat OFF.

DISP:

2P plug (white):

hort-circuiting this plug allows the unit to be operated by the remote controller,

(CN072

even if it is not connected to an outdoor unit.

010)

(In this case, alarm "E04," which indicates trouble in the serial communication between the indoor
and outdoor unit, does not occur.)

CHK:

2P plug (white):

Test pin.

hort-circuiting this pin allows the indoor FM (H fan speed), drain pump,

(CN071, 011) flap motor (F1 position), and electronic expansion valve full-open position to be checked.

However this function turns OFF if the indoor unit protection mechanism is activated. The unit can be
operated even if the remote controller and outdoor unit are not connected. However even if the
remote controller is connected, it cannot be used to operate the unit. This function can be used for
short-term tests.

JP001:

Jumper wire:

Allows selection of the T10 terminal start/stop signal. (Refer to the remote control section.)

tatus at shipment: Pulse signal

Jumper wire cut:

tatic signal (continuous signal)

FANDRIVE 2P plug (white):

This terminal sends a signal to the ventilation fan when the FAN button on the wired

(CN0

2, 017) remote controller is used to operate a commercially-available ventilation fan. (Refer to the remote

control section.)
Use a ventilation fan which can accept no-voltage A contact as the external input signal.

FILTER:

2P (white):

This terminal is used to connect contact input from the differential pressure switch which

(CN070, 012) detects filter clogging. When the contacts turn ON, “FILTER” is displayed on the wired remote controller.

Power LED: LED (red):

Illuminates when power is supplied. Blinks when there is a failure in the EEPROM (IC010,

002: nonvolatile memory).

EEPROM:

Nonvolatile memory:

Memory which stores the unit type data and other information. When the PCB

(IC010, 002) is replaced, remove the EEPROM from the old PCB and install it on the new PCB. If an IC failure

occurs, replace with the new IC which was provided with the service PCB, and set the necessary
information from the wired remote controller. (For the procedure, refer to the servicing technical materials.)

GRL:

For AC fan motor (CR-UXRP71B-B:

P (yellow))

(CN020)

For DC fan motor (CR-

XRP56B-B: 5P (blue))

The indoor unit power terminal plate may be a 7P,

P or 5P type. (Refer to the figure at below.) The basic wiring

diagram shows the 7P-type terminal plate. Therefore the terminal plate may differ from the illustrations.

Power
supply

Control

line