Panasonic U-72MF1U9 Service Manual page 109

2. Indoor Unit Control PCB
(1) The output signal is 12V DC. ("1" is "+" and "2" is "-".)
(2) A mistake in polarity while connecting might cause damage to both heater side and the PCB of the indoor unit.
(3) When installing the heater, be sure to turn OFF the power to the indoor unit.
(4) If it is wired to the HU connector, adjacent to the heater output terminal, by mistake, the heater signal can not be output correctly.
(5) The connector for this output is separately sold by the following part code: 623 312 1390
* Make connection inside the electrical component box.
*2 Wiring inside the electrical component box of the indoor unit should be carried out referring to the wiring diagram of each model.
Since it is necessary to wire to the low-voltage electrode, separate from the high-voltage.
Functions & Settings of External Heater Signal Output
Setting at factory shipment:
The external heater functions as a supplementary heater in the heating mode. The heater stops at the occurrence of alarm in the
system.
When the indoor EEPROM setting is set as emergency heater:
The external heater functions as a supplementary heater in the heating mode, and it can continue working, even when there is an
alarm in the system, except the type of the alarm is the following.
P01 or P12 (Failure in the indoor unit fan)
F10 (Failure of return air sensor)
In the case of EEPROM setting to the code 02 from the code 38, take caution as the indoor fan drives
CAUTION
during the alarm mode (regardless of the driving mode excepting P01, P12).
EEPROM setting for work as emergency heater:
If the item code "38" of the indoor EEPROM is changed from "0000" to "0002", the heater functions as emergency heater,
and keep on working, even when the system is in alarm. See the below how to select and change item code 38,
using remote controller, CZ-RTC2.
<Procedure of Indoor EEPROM Setting Changes>
Press and hold the
, unit No. (or
settings data are displayed blinking on the remote controller LCD display.
At this time, the indoor unit fan (or all indoor unit fans in the case of group control)
begins operating.
If group control is in effect, press the
(unit No.) of the indoor unit to set. At this time, the fan at the indoor unit begins
operating.
Press the temperature setting
to change.
Press the timer time
* For item codes and setting data, refer to the following page.
Press the button.
(The display stops blinking and remains lit, and the setting is completed.)
Press the button to return to normal remote controller display.
, and buttons simultaneously for 4 seconds or longer.
in the case of group control), item code
button and select the address
/ buttons to select the item code
/ buttons to select the desired setting data.
, and
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