Panasonic 26PEK2U6 26PEK2U6 Service Manual - Page 260

Table of Thermistor Characteristics, Check Pin, Outdoor Air Temp. TO, Intake Temp. TS

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4. Service procedures Check Pin Short-circuit the cooling check pin (or heating check pin) on the outdoor unit control PCB to perform the control described below. 1. Thermistor checks The checks listed below are performed for 1 second each, in order from the top down. The results are displayed by LED 1 and 2. Thermistor Discharge temp. (TD) Outdoor air temp. (TO) Heat exchanger temp. (C1) Heat exchanger temp. (C2) Intake temp. (TS) Check results Normal Abnormal LED 1 lit LED 2 lit LED 1 lit LED 1 and 2 OFF LED 1 lit 2. 4-way valve turns ON for 1 second. 3. Forced cooling (or heating) operation 4-4. Table of Thermistor Characteristics (1) Outdoor Air Temp. (TO), Intake Temp. (TS), Heat Exchanger Temp. (C1) Thermistor, Heat Exchanger Temp. (C2) Thermistor 40 Resistance (k ) 35 8 30 7 Resistance (k ) 25 6 5 20 4 15 3 10 2 5 0 -4 5 14 23 32 41 50 59 68 Temperature ( F) 1 0 68 86 104 122 140 Temperature ( F) (2) Discharge Temp. (TD) Thermistor 4 200 180 Resistance (k ) 160 140 120 100 80 60 40 20 0 32 50 68 86 104 122 140 158 176 194 212 230 Temperature ( F) 4-16

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4-16
4. Service procedures
Check Pin
Short-circuit the cooling check pin (or heating check pin) on the outdoor unit control PCB to perform the control
described below.
1.
Thermistor checks
The checks listed below are performed for 1 second each, in order from the top down. The results are displayed
by LED 1 and 2.
Discharge temp. (TD)
Outdoor air temp. (TO)
Heat exchanger temp. (C1)
Heat exchanger temp. (C2)
Intake temp. (TS)
Thermistor
Check results
Normal
Abnormal
LED 1 and 2 OFF
LED 1 lit
LED 1 lit
LED 1 lit
LED 2 lit
2.
4-way valve turns ON for 1 second.
3.
Forced cooling (or heating) operation
4-4. Table of Thermistor Characteristics
(1)
Outdoor Air Temp. (TO), Intake Temp. (TS), Heat Exchanger Temp. (C1) Thermistor,
Heat Exchanger Temp. (C2) Thermistor
(2)
Discharge Temp. (TD) Thermistor
Resistance (k
)
Resistance (k
)
Temperature ( F)
Temperature ( F)
40
35
30
25
20
15
10
5
0
-4
5
14
23
32
32
50
68
86
104 122 140 158 176 194 212 230
41
50
59
68
68
86
104
122
140
8
7
6
5
4
3
2
1
0
Resistance (k
)
Temperature ( F)
0
40
60
80
100
120
140
160
180
200
20
4