York YH9FXH12BAH FX Series Service Manual page 20

7.1.8.2 If the switch is kept pressed for 5 seconds, buzzer ring two times and unit enter enter test run mode.
7.1.8.3 Press the switch again, and then closes.
7.1.8.4 Enter emergency operation from timer mode, then timer is cancelled.
7.1.9 Test run:
7.1.9.1 The temperature sensor of inlet air doesn't work, and compressor starts (but subject to the limit of
-minute delay excluding the first time), and high wind, cooling, and air door is open. The indoor fan motor runs, running
indicator lights up, compressor relay and the one of outdoor fan motor is closed
7.1.9.2 During test run:
The prevention of freezing of evaporator doesn't work.
Current cross control doesn't work.
The control of current cross peak expiration doesn't work.
Temperature control doesn't work.
Temperature expiration control doesn't work.
7.1.10 memory function
The memory function of power down is available, and the auto recovery function of power on is optional. (In auto,
heating, cooling, or defrosting status, press the "sleeping" button 10 times within 5 seconds, and the auto recovery
function of power on can be set on/off. If the buzzer rings 4 times, the the auto recovery function of power on is
available; If the buzzer rings 2 times, the the auto recovery function of power on is unavailable.)
If there is no EEPROM, the unit is taken off the 'off' function of the memory function of power down. But the
memory function of power down can also be set on/off, and the data is the default value of chip.
7.1.11 Alarm from indoor fan motor:
2 minutes later after the indoor fan motor is charged, and the impulse from fan motor is not detected, hen send
alarm signals.
7.2 Value of Thermistor
7.2.1 Indoor unit
R25 =23K ±3.5%
B25 /50 =4200K±3%
Temp.( )
-30
-29
-28
-27
-26
-25
-24
-23
-22
-21
-20
Max.(K ) Normal(K )
568.8372 501.0746
530.9600 468.6491
495.8488 438.5314
463.2850 410.5433
433.0683 384.5212
405.0156 360.3153
378.9588 337.7879
354.7440 316.8126
332.2300 297.2732
311.2873 279.0627
291.7969 262.0831
Room sensor
Min.(K )
440.8435
413.1441
387.3645
363.3602
340.9980
320.1558
300.7211
282.5905
265.6686
249.8676
235.1067
18
Functions and control
Tolerance( )
-1.97 1.75
-1.95 1.74
-1.93 1.72
-1.91 1.71
-1.90 1.70
-1.88 1.69
-1.86 1.67
-1.84 1.66
-1.82 1.64
-1.80 1.63
-1.78 1.62