STA-RITE SR200NA Service Manual page 45

SECTION FOUR – Routine Maintenance and Professional Servicing
Combustion Air Blower
(Continued from the preceding page)
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6. Disconnect the plastic tubes at the blower and
remove the Air Orifice and Grille (See picture
above).
N N N N O O O O T T T T E E E E : : : : Slit the tubing before removing it to avoid
breaking the hose barbs. Trim the tubing when rein-
stalling it.
7. Remove the four nuts connecting the Blower outlet
flange to the Blower/Adapter Plate.
8. Lift the blower off the four mounting studs.
9. Replace the Combustion Air Blower by reversing
Steps 1 through 7 above. See the following NOTE.
N N N N O O O O T T T T E E E E : : : : When replacing or reassembling the
Combustion Air Blower:
1. Install a new Adapter Plate/Blower Gasket. Tighten
the Blower outlet flange nuts onto the studs in a
criss-cross alternating sequence to a torque of
125-150 in-lb. Do not overtighten.
2. Use a soapy-water solution to leak test the Blower's
outlet flange. Note the following:
a. When checking for leaks, raise the Blower's out-
let pressure by blocking the flue or Vent Body
with your hand.
S S S S a a a a f f f f e e e e t t t t y y y y P P P P r r r r e e e e c c c c a a a a u u u u t t t t i i i i o o o o n n n n s s s s : : : :
Fire and explosion hazard. The Air
Orifice is sized specifically for the air/gas mixture
required by the burner. Do not modify the Air Orifice
or replace it with an orifice of a different size.
End Cap/
Air Orifice
1
3. Reconnect tubing to Air Orifice and Grille as shown
A A A A i i i i r r r r O O O O r r r r i i i i f f f f i i i i c c c c e e e e a a a a n n n n d d d d G G G G r r r r i i i i l l l l l l l l e e e e
The Air Orifice attaches to the Mixing Tube inlet.
It precisely meters the combustion air going into the
Combustion Air Blower. If the Air Orifice becomes
plugged or damaged, replace it with a genuine
Sta-Rite part. Do not modify it or try to use a different
orifice/grille. See Page 5-3 for part numbers.
Combustion Air Blower handles a combustible air/gas
mixture. When servicing this part, check all seals for
tightness to ensure the Blower is not leaking.
4-13
3
2
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P IL
b. Operate the blower with the gas turned off by
increasing the temperature setting on the
Membrane Pad.
above.
Fire and explosion hazard. The
R R R R u u u u n n n n t t t t u u u u b b b b i i i i n n n n g g g g a a a a s s s s
s s s s h h h h o o o o w w w w n n n n : : : :
1. From Air Flow
Switch to bottom of
Air Orifice.
2. From Combination
Gas Valve Vent to
Air Orifice Port.
3. From Air Flow
Switch to Air
Orifice Port.