38
RP-HRPD-IOM (07-22) 132210-B
Figure 22. Heat Exchanger V-Baffles Removal
MAINTENANCE—CONTINUED
Maintenance Procedures—Continued
Heat Exchanger Cleaning—Continued
2 . Clean heat exchanger inner surfaces (combustion gas side):
NOTES:
• For cleaning the inner surfaces of the heat exchanger, an air hose, a long (18- to 24-inch) stiff
brush of 1/2-inch diameter or heavy wire with steel wool securely attached, a flashlight, and a
mirror are needed.
• Furnaces designed to provide high-efficiency heating have V-shaped baffles in the top of each
heat exchanger tube. High-efficiency furnaces manufactured before MAR 1995 have a C prefix
in their model designation. All furnaces manufactured after FEB 1995 are designed for high-
efficiency and include the heat exchanger V-baffles.
a . Remove burner rack assembly in accordance with
section .
b . Remove heat exchanger V-baffles (see
):
(1) Remove ends of flue gas collection box .
(2) On control side of furnace, remove venter assembly and flue outlet duct to gain access to collection box end .
(3) For model RP unit sizes 125–300, remove screw that secures one tube baffle retaining angle on each
inside wall of collection box and remove angle .
(4) For model RP unit size 400, remove inner baffle from flue collection box: on control side, align inner baffle
with slot in collection box edge and pull inner baffle until it clears heat exchanger . Remove screw at each
end and slide flue diverter out of furnace .
(5) Pull V-baffles out of heat exchanger .
c . Clean inner surfaces using furnace brush or piece of heavy wire to which piece of steel wool is attached . Scrub
tube walls to remove any accumulated dust, rust, and/or soot .
d . Clean V-tubes and reassemble heat exchanger .
e . Install burner rack assembly in accordance with
section .
3 . Check furnace for proper operation .
