Step 2 Open Front Cover
4. Loosen, but
DO NOT REMOVE
(2) lower nylock nuts on
hinge bolts below burner.
5. Remove (3) upper nuts and support cover while opening.
6. Inspect burner head/end cone condition.
ANNUAL TUNE UP & INSPECTION
Annual Tune Up and Inspection
Ascent™ Combi & Ascent™
Plus Combi Oil Boilers
Please refer to owner and installation manual for complete details.
AIR BOX
Step 5 Close Front Cover
4. Install (3) upper nuts and washers.
5. Tighten nuts (5) uniformly
-
DO NOT overtighten.
6. Check and tighten (5) rear cover nuts.
4. Check Flue Pipe.
5. Check chimney base and clean if necessary.
Step 3 Inspect Flue Passage and Vent System
If passage is clean, no scale, then close cover and
tighten all hardware evenly.
Clean ONLY if dirty.
Check vent system joints for proper connections,
including Ascent Plus Combi flexible coupling clamps
and condensate drain.
Step 4 Clean Boiler
Remove stainless steel alloy combustion chamber using caution, it may
be hot. Brush and vacuum the heat exchange surface if needed.
Step 1 Initial Test (Draft Check & CO
2
)
If there is an optional Silent Burner Cover, make sure it is in place
before testing.
1.
Remove the 1/8” brass plug from the flue box plug (1) in the
top right corner of the front cover. Check draft at the flue box
(1) using a 12” long piece of ¼” O.D. steel or copper tubing
inserted approximately 8” into the boiler. Connect this tube to
your test probe using a piece of hose.
This must be negative for proper operation.
2. Check CO
2
through the “over fire” test port (2). Insert the 12”
long steel or copper tube approximately 8” in through the test
port.
Recommended settings at the test port:
Oil-fired: 10% to 11% CO
2
1
2
1
2
1
2
