Vent Fan Shroud (continued)

TM-9-2540-207-14P Fire Control Material Manual
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TM 9-2540-207-14&P 5.2.3 Vent Fan Shroud (continued) Removal (continued) Note: The Combustion Air Duct should remain attached to the Vent Fan Shroud. Loctite 770 primer and Loctite 401 are used to seal the Combustion Air Duct to the Vent Fan Shroud. Tip: To start removal, a screwdriver blade may be used to gently pry the shroud tabs away from the Vent Fan Housing. Pull the Vent Fan Shroud evenly away from the Vent Fan Housing. 4. Pull the Vent Fan Shroud straight out from the Vent Fan Housing. The Combustion Air Duct will move up as it passes over the Vent Fan Housing. Installation 1. Ensure that the Combustion Air Duct is firmly attached to the Vent Fan Shroud and that it is not damaged. Replace if required. If necessary, re-attach the Combustion Air Duct to the Vent Fan Shroud by using Loctite 770 and 401. Follow the manufacturer's instruction for gluing. 2. Check that the Shroud Seal on the Vent Fan Housing is in place. Re-attach with Loctite 770 and 401 if necessary. 3. Line up the Vent Fan Shroud with the Vent Fan Housing and push into place. 4. Apply Loctite 242 (blue) to the threads of the three (3) flat-head screws. Use a #2 cross-tip screwdriver to secure the Vent Fan Shroud to the Vent Fan Housing. 5. Check that the Impeller is free to rotate. 6. Apply Loctite 242 (blue) to the four (4) hex-head screws, and secure the Dual Air Adapter in place using a 1/4" socket, or 1/4" nut driver. Ensure that the flat washers and lock washer are in place on each screw. (ref Fig. 2-1) 7. Install Vent Fan Assembly to the Heater. (ref. 5.2.1) 5-16

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