PTAC Service Manual
Service Manual
Technical Information
61
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.
Entry condition: if select low temperature protection valid with dial switch (see special function), if it detects that the indoor ambient
temperature is lower than 40
o
F(5
o
C),air conditioner will enter into pure electric heating mode; low temperature protection will be
started up.
Exit condition: when indoor ambient temperature is increase more than 50
o
F(10
o
C), low temperature protection will be stopped;
2. Users interface display and button
2.1 Button function:
There are ON/OFF, WARMER, COOLER, MODE, FAN SPEED, TIMER six buttons in all;
2.1.1 In OFF mode, press the ON/OFF button to turn on the unit: In OFF mode, if pressed the WARMER or COOLER button, the “dual
8” will be turned off after displaying the indoor temperature for 15s; If pressing the MODE button in OFF mode, the controller will
resume to the running status before turning off the unit. The running LED is displaying in green color.
2.1.2 In ON status, all the buttons are in valid.
1) ON/OFF: After pressing the ON/OFF button, the unit can be switched between ON and OFF mode.
2) MODE:
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3) FAN SPEED: In ON status, after pressing the FAN SPEED button, you can select the low, medium, high and auto fan speed.
4) WARMER, COOLER:
a. In TIMER setting status, the timer can be set within 0-24 hours. In 10 hour timer, the time is adjusted every 0.5 hour by pressing
the button. In timer above 10 hour, the time is adjusted every 1 hour by pressing the button.
b. In temperature setting status, the temperature can be adjusted every 2
o
F (1
o
C). Temperature setting range is 61-86
o
F (16-30
o
C)
and you can also select other setting temperature range through confi guration.
5) TIMER:
a. In the status without timer, it will enter timer setting by pressing this button.
b. In the status with timer, it can show the residual time by pressing this button.
c. Press this button to cancel timer when showing the time or setting timer.
2.2 Dual 8 Display and LED Display
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2.2.1 Mode LED display: when the A/C is running in a certain kind of mode, the corresponding LED is bight.
2.2.2 Running/power LED: In ON status, the controller is in green color; In OFF status, the controller is red color.
2.2.3 Fan speed display: when the A/C is running at high, medium, low and auto fan speed, the corresponding LED is bright.
2.2.4 Dual 8 display: In cooling and heating mode, it is default to the display the setting temperature (In fan mode, it displays the
indoor ambient temperature).
2.2.5 When the display data has three-position, the dual 8 is rolling to display. Display the “decimal” +“units place” at fi rst, and then
display “BLANK”+ “hundreds place”
2.2.6 Malfunction Display
After energization, STATUS LED is bright, while when theres malfunction or protection, STATUS LED will blink to display in any
circumstances.
The details are as below: priority is decreasing from 1 to 8.
In OFF mode, dual 8 wont display the error code (except the low temperature protection), and number 6, 7 protection marks will be
eliminated. When multiple protections are overlapped, it activates only the protection with the highest priority.
1
Indoor ambient temperature sensor is open
circuit and short circuit
Dual 8 displays "F1", STATUS LED blinks once and goes
out for 3s circularly.
2
Indoor tube temperature sensor is open
circuit and short circuit
Dual 8 displays "F2",STATUS LED blinks twice and goes
out for 3s circularly.
3
Outdoor tube temperature sensor is open
circuit and short circuit
Dual 8 displays "F4", STATUSLED blinks 4 times and
goes out for3s circularly.
4 Low temperature protection Dual 8 displays “FP”
5 Wrong wire connection for wired controller STATUS LED blinks9 times and goes out for3s circularly.
6 High temperature protection for evaporator STATUS LED blinks8 times and goes out for3s circularly.
7
High temperature protection for outdoor
condenser
STATUS LED blinks6 times and goes out for3s circularly.
8 Freeze protection for evaporator STATUS LED blinks5 times and goes out for3s circularly.
9 Frost protection(heat pump) STATUS LED blinks7 times and goes out for3s circularly.
STATUS indicator
7-bit dial switch