Operating instructions

Part number 550-141-887/0800
29
AHE Series 4 Direct Vent Wall-Mounted Boilers — Boiler Manual
Service
continued
Cleaning boiler heating surfaces
Gas boilers burn cleanly — check to
see if flue cleaning is necessary.
1. Shut down boiler following “To Turn Off Gas To
The Appliance” instructions found on pages 24 and
25. Do not drain the system unless exposure to
freezing temperatures will occur. If antifreeze is
used with system, do not drain.
2. Remove entire jacket assembly and boiler
insulation. Pay attention to the WARNING on page
48 regarding working with insulation materials.
3. Unplug ignitor before removing. Carefully remove
ignitor (see Figure 20, page 28) and ignitor gasket.
Use caution — ignitor is brittle and can break.
Wait several minutes until ignitor
cools down before removing. Failure
to do so will cause severe personal
injury.
4. Remove burners:
a. Remove wires from rollout thermal fuse
element.
b. Remove burner plenum cover. (Figure 30, item
9, page 42.)
c. Pull off burner clips.
d. Remove main burners.
5. Remove cleanout plate from right side of boiler.
See Figure 21.
a. If no soot is present, proceed to Step 9.
b. If soot has accumulated, continue to the next
step.
6. Remove entire blower assembly:
a. Remove 2 screws on mounting plate.
b. Remove white and red tubing.
c. Pull unit from boiler.
7. Thoroughly clean all visible heating surfaces and
remove soot. See Figure 22.
8. Replace blower motor assembly:
a. Reseal all surfaces for gas-tight seal.
b. Replace screws and tubing.
9. Clean burners. See “Burners and base” on page 28.
10. Replace burners. See Step 3.
When replacing, burner tubes must
be seated in slots in the back with
the openings face up. Front of
burner tubes must rest fully over
main burner orifices. Main burner
orifices must inject down center of
burner. Failure to do so will cause
severe personal injury, death or
substantial property damage.
11. Reseal and replace cleanout plates.
12. Replace insulation and jacket assembly.
1. Perform start-up procedures given in this manual,
page 20.
2. Verify cold fill pressure is correct and that fill system
is working properly.
3. Verify antifreeze level (if used) is at the right
concentration and that inhibitor level is correct.
4. Check gas piping, per Manual Section 5, page 18
and Section 8a, page 20.
5. Read the “Operating instructions” on boiler label
or on pages 24 and 25, applying to your boiler.
6. Start the boiler following the “Operating
instructions” found on pages 24 and 25 of this
manual.
Start-up
Figure 22
Figure 21
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