Arkansas HVACR NewsMagazine September 2022

HVACR NewsMagazine September 2022

Tech News

cleaned in place, you may quote a removal and clean the coil if it has no known leaks and is less than 7 years old. 18. Connect a wet vac to the drain outside. 19. Remove the panels from the air handler and begin pouring water into the drain pan, all the while helping any sludge in the pan get removed by moving it toward the pan outlet. Use duct tension straps or zip tie ends/small bottle brushes to help pull sludge out from the sides of the pan under the coil and clean all channels. 20. Run a minimum of 2 gallons of water through the pan, and then empty the vacuum. Run another gallon through and repeat the process until the pan is visibly clean and the water in the vacuum is clean. 21. Run 1 more gallon through the drain once done and ensure it runs out. 22. Spray and wipe down the inside and outside of the air handler, including wires, with a safe anti-microbial solution. 23. Remove any dust from the blower motor body and end bell with a vacuum, rag, or soft brush, being careful not to force dust further into the motor. When the dust buildup is severe, use compressed air or nitrogen and a vacuum to remove it. 24. Test the blower capacitor by removing the leads, testing with a capacitor tester, and reconnecting the leads. 25. Inspect the blower wheel for cleanliness. If it is dirty, check the applicable maintenance type to see if removing and cleaning the blower is extra or included. 26. Check the blower motor bearings for play.

27. Inspect all wires for rub out inside and outside the air handler. Inspect and disconnects and check any lugs for tightness. 28. Check low voltage wiring and dip switch/pin settings. If the system has an advanced interface, you will need to check for proper settings at the controller. 29. Check coil feeder tube location and condition. If tubes begin to rub out, isolate them and strap them together using foam tape and zip ties. 30. Inspect the float switch for proper installation and wiring. Test the float switch to ensure it breaks the circuit when the float rises. If there is no float switch, quote to install one at the end of service. 31. Check air handler panel insulation and glue or retape it as required. 32. Spray down the coil surface lightly with antimicrobial and add 3 pan tabs to the front of the drain pan away from the outlet. 33. Install a new air filter with the date and your name. 34. Replace the bottom air handler panels and turn the air handler breaker on. 35. Run the heat and test the heat strips on and off using an amp meter; note heater and blower amps. 36. Shut off the air handler, replace all panels, and double-check that the drain cleanout cap is in place and the float switch is in the correct position. 37. Put the system into cool mode and turn the air handler back on (condenser disconnect still off/out). 38. If the system has been checked during previous calls and has no history of leaks, then use the historical data to perform a non-invasive refrigerant test. If this is the first maintenance or if the system has a history of issues, then connect gauges.