Mitsubishi Electric PUHY-(E)P300, Service Handbook

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[
X
LED Monitor Display on the Outdoor Unit Board ]
- 249 -
HWE07010 GB
X LED Monitor Display on the Outdoor Unit Board [1] How to Read the LED on the Service Monitor
1. How to read the LED
By setting the DIP SW 1-1 through 1-10 (Switch number 10 is represented by 0), the operating condition of the unit can be
monitored on the service monitor. (Refer to the table on the following pages for DIP SW settings.)
The service monitor uses 4-digit 7-segment LED to display numerical values and other types of information.
Pressure and temperature are examples of numerical values, and operating conditions and the on-off status of solenoid valve
are examples of flag display.
2. LED display at initial setting
From power on until the completion of initial settings, the following information will be displayed on the monitor screen.
(Displays No. 1 through No. 4 in order repeatedly.)
After the initial settings have been completed, the information on these items can be checked by making the switch setting
that corresponds to No. 517 in the LED display table.
Only item No. 1 "Software Version" appears on the display if there is a wiring failure between the control board and the trans-
mission line power supply board or if the circuit board has failed.
1) Display of numerical values
Example: When the pressure data sensor reads 18.8kg/cm
2
(Item No. 58)
ΠThe unit of pressure is in kg/cm
2
ΠUse the following conversion formula to convert the displayed value into
a value in SI unit.
Value in SI unit (MPa) = Displayed value (kg/cm
2
) x 0.098
2) Flag display
Example: When 21S4a, 21S4b, SV1a are ON. (Item No. 3)
Example: 3-minutes restart mode (Item No. 14)
No Item Display Remarks
1
Software version
[0103] : Version 1.03
2
Refrigerant type
[ 410] : R410A
3
Model and capacity
[H-20] : Cooling/Heating 20 HP
For the first few minutes after power on, the capacity of
each outdoor unit is displayed. Thereafter, the com-
bined capacity is displayed.
4
Communication address
[ 51] : Address 51
SW1
ON
1 2 3 4 5 6 7 8
SW1-10 is represented as “0” in the table.
9 10
7SEG LED
LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8
Upper
Lower
LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8