Weil-McLain SlimFit 2 Series Manual page 91

SlimFit ® Series 2
Annual startup
Perform startup procedure per manual
1. Perform all startup procedures on pages page 82 through
page 85.
Check burner flame
1. Inspect flame through the observation window using the
procedure on page 82.
a. The high fire flame should be blue and should be stable.
The burner surface should be covered with orange dots.
b. The low fire flame should be stable and evenly distributed
over burner surface with a uniform orange color.
2. If the flame is unsatisfactory at either high fire or low fire, per-
form the testing specified on page 82. If the problem remains,
turn off the boiler and allow the boiler to cool down.
To access the burner:
The boiler contains ceramic fiber materials. Use
care when handling these materials per instructions
on page 87 of this manual. Failure to comply could
result in severe personal injury.
1. Shut off power to unit.
2. Disconnect the two wire harnesses from the blower.
3. Remove the wire harnesses (and ground wire) from the igniter
(burner end section) and flame sense assembly (piping end
section).
Use a Phillips-head screwdriver to remove the igniter
assembly (burner end section) and flame sense
assembly (piping end section, Figure 84, item 6)
before removing the burner. Damage to the burner
and or igniters can occur during this process.
4. Remove the piping end section combustion chamber access
cover (item 11 in Figure 84).
a. Items are: cover plate (item 1), three nuts (item 2),
refractory (item 3), screw-on refractory clip (item 4),
gasket (5).
Leave the refractory attached to the access plate
unless the refractory has to be replaced.
5. Remove plastic reference tube from venturi (Figure 81,
page 90) — Push in on the tube and the plastic ring on the tube
fitting. While keeping the ring pushed in, pull out on the tube.
6. Pull the air flow switch tube off of the hose barb on the venture
(Figure 81, page 90).
7. Disconnect the air inlet hose from Venturi (Figure 81, page 90):
a. SF1000 & SF1500 — Remove M5 flange bolts (4)
from venturi / air inlet hose connection with 8mm
socket.
b. SF2000 — Remove M8 bolts (4) from venturi / air
inlet hose connection with 13mm socket.
8. Remove the M5 bolts (4) from the gas valve to gas manifold
assembly with 4mm Allen wrench (Figure 81, page 90).
9. Remove the M12 Flange nuts(3) from Mixing adapter and front
section with 17mm wrench or socket (Figure 83, page 90).
10. Carefully slide blower/venturi/mixing adapter off of M12 studs,
the assembly can be placed nearby.
The blower/venturi/mixing adapter assembly is
heavy, weighing up to 60 pounds on larger units.
Handle carefully to avoid possible personal injury
or damage to the components.
11. Remove the burner gasket.
12. Remove the burner:
a. Place your hand and or arm inside the burner for
control and stability during removal.
Part number 550-100-561/0224
commercial condensing gas
(continued)
- — Boiler Manual
fired water boiler
Figure 84
Combustion chamber access cover removal
2 2
1 1
Figure 85
Burner end assembly
9 9
8 8
7 7
There may be sharp edges on and inside the burner.
Use proper protection on your hand and arm to pre-
vent possible personal injury.
b. Slowly pull the burner out, being careful not to drag
the Fiber mesh on the casting during the process.
13. Clean the burner:
a. Vacuum cleaner method — Vacuum inside and out,
being careful not to rub or scrape the fiber mesh.
Compressed air method — Take precautions, in-
cluding close-fitting eye protection, due to possible
airborne debris during use of compressed air.
b. Water flush —
the refractory disc needs to be removed from the
end of the burner (see Figure 85). Carefully twist the
screw-on clip (item 7) counter clockwise to remove
it from the burner (item 10). This should allow for
removal of the metal dish (item 8) and the refractory
disc (item 9). Then rinse the burner from inside out.
Allow to dry completely. Re-attach the refractory disc
and retainer to the burner after cleaning.
14. Re-install the burner:
a. Carefully insert the burner, avoid dragging fiber mesh
as its inserted.
b. Align small dowel pins at the 5 and 7 o'clock positions
with the notches in the burner flange.
5 5
3 3
4 4
6 6
10 10
— Before water can used,
Water Only!
11 11
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