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<Branch box unit operation monitor function>
[When option part ‘A-Control Service Tool (PAC-SK52ST)’ is connected to branch box controller board (CNM)]
Digital indicator LED1 displays 2 digit number or code to inform operation condition and the meaning of error code by
controlling DIP SW2 on ‘A-Control Service Tool’.
SW2 setting
1
ON
23456
Display detail
Explanation for display Unit
Operation indicator SW2 : Indicator change of self diagnosis
<Digital indicator LED1 working details>
(Be sure that 1 to 6 in the SW2 are set to OFF.)
(1) Display when the power supply is ON.
When the power supply is ON, blinking displays by turns.
Wait for 2 minutes at the longest.
(2) When the display lights (Normal operation)
1The number of connected indoor units to this branch box (0 - 5)
1
ON
23456
(Initial setting)
SW2
1 second
interval
LED1
(Lighting)
1
ON
23456
Pipe temperature / Liquid (TH3)
– 40~90 (°C)
– 40~194 (°F)w
– 40~90 (°C), – 40~194 (°F)
(When the coil thermistor detects 0: or below, “–”
and temperature are displayed by turns.)
(Example)
When –10:; 0.5 secs. 0.5secs. 2 secs.
°C
°F(w)
10
1
ON
23456
Discharge temperature (TH4)
3~217 (°C)
37~327 (°F)w
3~217 (°C), 37~327 (°F)w
(When the discharge thermistor detects 100: or
more, hundreds digit, tens digit and ones digit are
displayed by turns.)
(Example)
When 105:; 0.5 secs. 0.5secs. 2 secs.
°C
°F(w)
1
05
1
ON
23456
Output step of outdoor FAN
0~15
Step
0~15
Unit number of this branch box
1~2
1 or 2
w Omit the figures after the decimal fractions.
Code
display
1
ON
23456
Compressor operating frequency
0~225
0~255
(When it is 100Hz or more, hundreds digit, tens
digit and ones digit are displayed by turns.
(Example)
When 125Hz; 0.5 secs. 0.5secs. 2 secs.
Hz
1
25
1
ON
23456
1
ON
23456
LEV-A opening pulse
0~500
0~500
(When it is 100 pulse or more, hundreds digit, tens
digit and ones digit are displayed by turns.
(Example)
When 150 pulse; 0.5 secs. 0.5secs. 2 secs.
Pulse
1
50
w SW1-8 : OFF (Unit: °C), SW1-8 : ON (Unit: °F)