Table of Contents
13-2-1. Detail Contents in Request Code
Request code
Ref.address
Request code
Request: SELECT
Cursor
[Operation state] (Request code: "0" )
Data display
C
4
Operation mode
Display
Operation mode
0
STOP • FAN
C
COOL • DRY
H
HEAT
d
DEFROST
[Indoor unit – Control state] (Request code : "50 ")
Data display
[Outdoor unit – Control state] (Request code: "51" )
Data display
0
0
0
0
Normal
0
0
0
1
Preparing for heat operation.
0
0
0
2
Defrost
[Compressor – Frequency control state] (Request code: " 52")
Data display
0
0
Frequency control state
1
Display
Current limit control
0
No current limit
1
Primary current limit control is ON.
2
Secondary current limit control is ON.
OCH754A
Example) Request code "004"
Discharge temperature 156°F
Refrigerant address "00"
Relay output state
Display
Relay output state
Operation mode
Display
Unit No. 4 state
Unit No. 3 state
Unit No. 2 state
Unit No. 1 state
State
Frequency control state
Display
Frequency control state 2
Frequency control state 1
Power currently
Compressor
supplied to compressor
0
–
1
2
3
4
5
6
7
8
ON
ON
A
State
0
Normal
1
Preparing for heat operation.
2
–
3
–
4
Heater is ON.
5
Anti-freeze protection is ON.
6
Overheat protection is ON.
7
Requesting compressor to turn OFF.
F
There are no corresponding units.
2
Discharge temperature Condensation temperature
overheat prevention
overheat prevention
0
1
Controlled
2
Controlled
3
Controlled
Controlled
4
5
Controlled
6
Controlled
7
Controlled
Controlled
8
9
Controlled
A
Controlled
b
Controlled
Controlled
C
d
Controlled
E
Controlled
F
Controlled
Controlled
82
Four-way valve
Solenoid valve
–
–
ON
ON
ON
ON
ON
ON
ON
ON
ON
Anti-freeze
Heatsink temperature
protection control
overheat prevention
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
–
ON
ON
ON
ON
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
Controlled
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