Maintenance
Blowing Out Motors Blow dust and dirt out of motor windings with a maximum of 50 psi compressed air so that winding damage does not occur. Cleaning UV Scanner The UV scanner is an electrical device that monitors the status of the flame inside the burner by “looking” at the ultraviolet light produced by a flame. The scanner is mounted to the side of the burner next to the igniter (close to the gas pipe entry). The scanner has a glass lens that over time needs to be cleaned. The lens can be cleaned by using isopropyl alcohol and a soft lint free cloth. Cleaning Igniter The igniter is an electrical device that produces a spark inside the burner for approximately 10 seconds while the burner is attempting to ignite. Over time, the igniter can be fouled by soot and other debris. To clean the igniter, remove if from the burner and wipe off any build-up with a cloth. Inspect the igniter for cracks along the porcelain which could lead to ignition failure. Replace igniter if visible cracks are noted. Ductwork Inspection The ductwork inside the oven is used to evenly distribute the air from the re-circulation fan(s). Over time, debris can build up inside the ductwork which could present a potential fire hazard. Inspect the duct for any debris build-up and clean as needed. Also inspect the exhaust fan ductwork which is typically located on top of the oven, and allows hot air to leave the oven and exit the building. Cleaning The Burner Airfoils The airfoils are located inside the burner frame. There are two sets of foils (inner and outer). The outer foils can be accessed from inside the oven heater box. Clean the foils with a wire brush. If the foils appear to be clogged, use a small drill bit to open/clean the holes. The inner foils can be inspected from the back side of the burner by removing the combustion blower. After the blower is removed, use a flash light to inspect the holes in the foils. If the holes appear clogged, complete burner disassembly will be required to access the inner foils. Inspecting Door Seals The door seals surround the parameter of each door. Over time, the seals can become torn or worn to the point that they no longer create a seal between the oven frame and the door. Replace any sections that appear to be worn or not sealing properly against the door frame. Testing Operation of Gas Shut-off Valve The gas shut-off valve is an electrical device that turns on or off the flow of gas to the burner. The valve is an assembled part of the valve train which includes the pressure regulator, pressure switches, and proof of closure switch. To test the valves, turn the burner off, then close the downstream ball valve. Connect a manometer to the downstream test port. Allow the manometer to be connected to the test port for five minutes. After five minutes have passed, check the manometer reading – it should be zero. Cleaning Air Pressure Switch Tubing Remove the tubing from the + and – side of the pressure switch. Blow compressed air with a maximum pressure of 50 psi through the tubing into the oven. Do not blow compressed air into the pressure switch. The tubing should be inspected on the inside of the oven to ensure it has not broken off of its mounting locations. Replace any damaged tubing with 3/8” copper.
44
Made with FlippingBook - professional solution for displaying marketing and sales documents online