AFD/TFD Service

1. AFD/TFD Service

2. Agenda • Set-up • Fault code retrieval • Testing unit components • Testing the power door • Cleaning

3. Set Up Mode • In the Set Up Mode you can • Set the cleaning interval for the pre filter • Set the cleaning interval for the collector cells • Set the power level Pre Filter Collector Cells Power Level Dirty Dirty Dirty Clean Clean Clean

4. Set-Up Mode • Enter the set up mode by pressing and holding power and reset buttons for 5 seconds • The display will indicate how the unit is programmed • The factory settings are displayed • To change settings press power button once Dirty Factory Settings Clean

5. Scroll through the settings by repeatedly pressing reset button To save the settings and advance to the next setting press the power button once Exit the set up mode by pressing and holding power and reset buttons for 5 seconds Set-Up Mode Pre-Filter Collection Cells Power Level 3 Months 9 Months 9.6 KVDC Dirty Clean

6. Time Delays • 10 second time delay on a call for cooling • 90 second time delay on a call for heating • 10 minute time delay anytime the power to the air cleaner is turned off and on.

7. Normal Operation • During normal operation the green LED #1 with flash slowly when the blower is operating • There may be some other LED’s on based upon time to clean intervals

8. Three yellow flashing LED’s indicates the controls have detected 10 consecutive high voltage shut downs Three red flashing LED’s indicates the controls have detected the same fault 3 times in a row after a high voltage shut down Need for Service R3 R2 R1 Y4 Y3 Y2 Y1 G3 G2 G1

9. To enter the fault code log Go into the set up mode (press and hold power and reset for 5 seconds) Press and hold reset for 10 seconds Display goes out Green LED #1 and a combination of yellow and red LED’s indicate the first recorded fault in the log Fault Code Retrieval R3 R2 R1 Y1 G3 G2

10. Fault Code Log • Matching the pattern of LED flashes will give an indication of what fault has been posted to the fault code log • The column on the right of the chart will provide the recommended service procedure for that fault • An example is service procedure #5 is for repetitive arcing. The service procedure is to clean collection cell and field charger and check for arcing through plastic frame to cabinet

11. Clear Fault Code Log • To clear all 3 fault codes from the log • Press and hold the reset button 2 to 4 seconds while the fault codes are being displayed • The red and yellow LED’s will go out • The green LED will remain on to indicate which fault code number is being displayed • To exit fault code log press and hold the power and reset buttons for 5 seconds

12. Test Unit Components • There are 4 tests that can be performed using internal unit controls • High voltage relay test • LED test • High voltage output test • Thermostat input test

13. Test Unit Components • Entering the component test mode • Press and hold the power button until all ten LED’s come on then release the power button. The air cleaner is now off and LED’s should step off one at a time • Press the reset button 3 times in a row within 20 seconds of the LED’s stepping off • The pre-filter light will come on • Quickly press and hold the power and reset buttons at the same time • The pre-filter LED will begin to flash and continue to flash as long as the unit is in the component test mode. • The green LED #1 should be on

14. Test Unit Components The green LED’s will show which of the tests the controls are in

15. High Voltage Relay Test • Green LED #1 “on” indicates high voltage relay test mode • There are 3 tests within the high voltage relay section • Yellow LED’s indicate the test being performed

16. The red LED’s show the condition of each test The read out indicates High Voltage Relay test High voltage input current test Condition is within range High Voltage Relay Test

17. To advance from the high voltage relay test to LED test press the power button once All 10 LED’s will come on Press the reset button once to turn each individual LED off LED Test R3 R2 R1 Y4 Y3 Y2 Y1 G3 G2 G1

18. High Voltage Output Test • Pressing the power button once will advance the controls to high voltage output test • There are 4 high voltage output tests in this section • The tests range from 0 VDC to 9.6KVDC output

19. Green LED’s 1 & 2 will be on for these tests Yellow LED’s indicate which test is being performed Red LED’s indicate the condition of the test The display indicates High voltage output test (Green LED’s) 9.6KVDC output test (Yellow LED) Output is within range (Red LED) If test 1 is rerun after completing other tests it will take a few seconds for the condition to come into range High Voltage Output Test R3 R2 R1 Y4 Y3 Y2 Y1 G3 G2 G1

20. Thermostat Input Test • Press the power button once to advance to thermostat input test • There are 3 tests in this section • A thermostat call for heat (W) • A thermostat call for indoor blower (G) • 24VAC input to the air cleaner

21. This display indicates Thermostat input test (green LED) A thermostat call for indoor blower (G) (yellow LED) 24VAC input voltage is below minimum range (red LED) Low 24VAC input could be the result of VA rating of transformer Thermostat Input Test R3 R2 R1 Y4 Y3 Y2 Y1 G3 G2 G1

22. Exiting Component Test • There are 3 ways to exit the component test mode • Press and hold the power and reset buttons of 5 seconds • Remove 24 volt power supply to the air cleaner • Wait 5 minutes without touching any buttons

23. Tools required A high voltage probe and compatible volt/ohm meter or A screwdriver, jumper wire with alligator clips, tape and dry paper Turn off the air cleaner and remove the power door Form a piece of wire to be used to depress the door interlock switch Power Door Test

24. Power Door Test Caution high voltage is present for this test • Turn the air cleaner on and enter the set up mode • Adjust the power setting for normal (9.6 KVDC) • Exit the set-up mode and wait for green LED #1 to begin to flash • Connect the high voltage probe per manufacture instructions • Touch the center contact of the power door • The voltage should read 9.6KVDC +/- 600 volts

25. Power Door Test • Using a screwdriver, jumper wire, and dry paper • Tape a piece of paper to the screwdriver extending ½” beyond the end • Connect the jumper wire from the screwdriver shaft to the ground contact of the power door

26. Power Door Test • Form a piece of wire to depress the door interlock switch • Turn the air cleaner on and enter the set up mode • Adjust the power setting to normal (9.6KVDC) • Wait for green LED #1 to begin to flash • Take the plastic handle screwdriver move it close to center power door contact • When the paper touches the center contact the power supply should arc to the screwdriver • When the arc occurs the power supply will shut down for 10 minutes • If the arc occurs when the paper is near or touching the contact the power supply is good • If no arc occurs the power supply is bad. Replace the power door

27. Cleaning • Pre-filter cleaning • The pre-filter may be vacuumed or washed • It should be completely dry before re-installing • Collection cell cleaning • The collection cells may be vacuumed or washed • Vacuum both sides • Wash using low pressure sprayer. Warm water will remove some residue

28. Cleaning • Do Not • Use soap or detergents on collection cells • Immerse collection cells completely in water • Place collection cells into a dishwasher • If water is used in cleaning collection cells • Slightly tap the collection cell to remove water • The collection cell must be dry before re-installing • Reset filter timers • Reset pre-filter timer: press and hold the reset button until pre-filter LED goes out (1 to 2 seconds) • Reset collection cell timer: press and hold reset button until collection cell LED’s go out (4 to 5 seconds)

29. Cleaning • Cleaning field charger • Field charger should be cleaned annually • Turn air cleaner off and remove power door • Bend field charge locking tab down and remove field charger • Wipe face plate with dry shop towel or vacuum Field charger locking tab

30. Field Charger Cleaning • Power off for minimum 15 seconds • Remove from case and lay on flat surface • Bend locking tab down and remove field charger • Wipe face with shop towel • Do not disassemble the field charger • Use a piece of foam to clean ionizing pins and faceplate leading edges • Ionizing pins are easy to bend

31. Cleaning • Caution field charger pins are sharp • Do not bend pins • Wear gloves • Use a block of foam to clean the pins • Push the foam block over the pin • Rotate the foam block • Use the foam block to clean faceplate opening edges • Reinstall field charger and bend one locking tab

32. Trouble Shooting • Air Passing Through the Cleaner Emits a Slight Sound • Select Lower “Power Setting” in the “Set Up” Mode to Reduce • Minimal Impact on Cleaning Efficiency

33. AFD/TFD Summary • What we covered • Set-up • Fault code retrieval • Testing unit components • Testing the power door • Cleaning • There is a more detailed training available from Learning Resources. Look for details on Thursday during the general session.