Mitsubishi Electric EHST20C-VM6HB Service Manual page 79

Split-type, air to water heat pump
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11-8-1. Detail Contents in Request Code
[Operation state] (Request code :" 0")
Data display
C 4
Operation mode
Display
Operation mode
0
STOP • FAN
C
COOL • DRY
H
HEAT
d
DEFROST
[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 2
Frequency control state 1
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.
[Fan control state] (Request code :" 53 ")
Data display
0
0
Display
Correction value
− (minus)
−1
0
0
1
+1
+2
2
OCH533D
Relay output state
Display
Relay output state
Operation mode
State
Frequency control state
Display
Fan step correction value by heat sink temperature overheat prevention control
Fan step correction value by cool condensation temperature overheat prevention control
Power currently
Compressor
supplied to compressor
0
1
2
3
4
5
6
7
8
ON
A
ON
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
79
Four-way valve Solenoid valve
ON
ON
ON
ON
ON
ON
ON
ON
ON
Anti-freeze
Heat sink 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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