Panasonic Inverter Air Conditioner R410A Technical Data And Service Manual

2-1 Room Temperature  Control .......................................................................................... 2-2
2-2 Cold Draft Prevention (Heating Cycle) ........................................................................ 2-4
2-3 Automatic Fan Speed (Indoor Unit) ............................................................................. 2-5
2-4 Control Functions ......................................................................................................... 2-6
2-5 Outdoor...

2-2
2. Processes and functions
Fig. 1
(THERMO.  OFF)
(THERMO.  ON)ROOM TEMP.
THERMO.  ON
5 MINUTES MORE THAN
5 MINUTES 3 MINUTES SET TEMP
COMPRESSOR
OUTDOOR FAN
(H   OR  M)
INDOOR FANF F O F F O
F F O F F O
1
1.  Refer  to  2-4  Outdoor Fan Speed ControlMORE THAN
3 MINUTES MORE THAN
5 MINUTES 
N O N O N O
N O N O N O
SET SPEED T+2°F
T–2°F .  T °F BODY SENSOR
1133_THS_I
THERMO.  OFF
Chart Summary and Explanations
Once the compressor starts, it keeps running for 5 minutes.
Once the compressor stops, it...

2-3
2. Processes and functions
Fig. 2
THERMO.  ON
THERMO.  ON
+2°F
F F O F F O 2
1.  Refer  to  2-4  Outdoor Fan Speed Control OFF
SET SPEED
N O N O N O
ON (REVERSING CYCLE)
ON TEMP.
OPERATION REMOTE CONTROL 
SENSOR
(Only for wireless 
remote controller)
BODY SENSOR
OFFOFF SET SPEED SET SPEED 3 SECONDSON OFF ONMORE THAN
3 MINUTES
OFF
ON OFFON OFF ON OFF OFF ON3 MINUTESMORE THAN
5 MINUTES 5 MINUTESTHERMO.  ON
THERMO.  ON THERMO.  ON THERMO.  ON
2.  Refer  to  2-2  Cold Draft Prevention (Heating)...

2-4
2. Processes and functions
Fig. 3
92
88
81
77
50
SET
FA N
SPEEDAUTO  OR  H
M
L LL LL/OFF LL L L LLL LL/OFF LL L M M LL LL/OFF LL L M HMAX.  6  MINUTES
“STANDBY”
INDICATOR INDOOR  UNIT
COIL TEMP.
E2 (°F)
LL= Very low speed
L= Low speedM= Medium speed
H= High speed “STANDBY” APPEARS
1135_THS_I
Chart Summary and Explanations
The main idea of this chart is to show that the indoor fan speed increases and gets closer to
the set fan speed as the coil temperature E2 rises.
The indoor unit fs coil temperature...

2-5
2. Processes and functions
Fig. 4
INDOOR FAN
SPEED
L H
MMH
1923_M_S
ROOM TEMP.
(deg)
SET TEMP.+3
+2
+1
H
M: High
: MiddleL: Low
Chart Explanations and notes
When the fan speed changes, it keeps the speed step for at least 3 minutes, even if the
temperature changes to another speed step during the time.
Fig. 5
INDOOR FAN
SPEED H
L MMH
1924_M_S
ROOM TEMP. 
(deg)
SET TEMP.
–2
–4
H
M: High
: MiddleL : Low
Chart Explanations and notes
When the fan speed changes, it keeps the speed step for at least 1...

2-6
2. Processes and functions
124 142
2-4 Control Functions
Electronic control valve control
Opening of the electronic control valve is controlled so
that the appropriate operating conditions are maintained,
based on the signal from each sensor (discharge
temperature [TD], intake temperature [TS], outdoor heat
exchanger temperature [C1], and indoor heat exchanger
temperature [E1, E2]).
Discharge temperature release control
(1) This control lowers the operating frequency of the
compressor when electronic...

2-7
2. Processes and functions
36
(36, 48 types)
Overcurrent protection control
(1) If the overcurrent protection circuit detects
abnormal current, the compressor is stopped. (Error
count = 1.) The compressor then restarts after 3
minutes.
(2) If compressor start/stop is repeated 4 times (error
count = 4), alarm P26, P29 or H01 (count = 2
in this case only) occurs. Operation stops and does
not restart.
Current release value shift control
(1) This control is intended to improve compressor
reliability by...

2-8
2. Processes and functions
1





2
3Defrost control
Defrost sequence
Heating operation 
(25-minute mask)
Frost detection
Defrost start 
(reverse cycle defrost)
Defrost in progress
Defrost cancel
Start-up operationOperating frequency: 61.8 Hz
Outdoor unit fan: OFF
Electronic control valve: step 300 
4-way valve: OFF
Indoor unit fan: OFF
Defrost control
(1) Frost detection
1. Outdoor heat exchanger temperature (C1) method (15-minute mask after operation start)
2. Outdoor air temperature is 7°F or...

2-9
2. Processes and functions
Fan motor plug (CN004)EEPROM IC MDC Heat exchanger temperature (C2) sensorHeat exchanger temperature (C1) sensorSuction temperature (TS) sensor
Outdoor air temperature (TO) sensor
Compressor discharge temperature (TD) sensor
Refrigerant recovery switch 
(S005)
Quiet mode plug (CN028)
EXCT plug (CN026)
Automatic address 
setting switch (S001)
Snowfall sensor
Cooling test
Test pin (CN036)
Operation circuit fuse 
(F002)
LED 1, 2 Serial 1 plug
Terminal plug (CN015)
Serial 2...

2-10
2. Processes and functions
Push-button switch (black): Automatic address setting switch
 If the system address switch (S002: set to 0 at time of shipment) setting is other than
0 (central control), press this switch once to automatically set the addresses at all
indoor units which are in the same system, and are connected to that outdoor unit.
During automatic address setting, the 2 LEDs (red) on the outdoor unit control PCB
blink alternately.
(Pressing this switch again stops automatic address...