6.
Pry the bottom half of the heat exchanger apart by using the
designated prying tabs;
7.
Remove the bottom half of the heat exchanger through the front
of the furnace;
8. Pull the firepot up and out of the bottom half of the heat
exchanger;
9.
Remove the old sealing gasket from the flange of the upper half
of the heat exchanger;
10. Scrape any residual gasket material off the matching flanges of
the heat exchanger.
Replacing the firepot
1.
Align the slot at the front part of the firepot with the burner tube
sleeve and gently lower the firepot into the bottom half of the heat
exchanger;
2.
Holding the firepot near the perimeter, gently push the firepot all
the way into the bottom half of the heat exchanger until it is
properly seated;
3.
Thoroughly wet the gasket with water using a spray pump bottle,
position the tabs over the studs, and push the gasket upward
against the sealing flange of the upper half of the heat
exchanger;
4. Install the brass nuts on the studs by engaging only 2 or 3
threads;
5.
Position the bottom half of the heat exchanger underneath the
upper half and align the bottom half so that the slots in the bolting
tabs engage the stainless steel studs. There is no further need to
hold onto the bottom half as it will now be suspended on the stud
nuts;
6.
Push upward on the housing and thread the nuts finger-tight as
far as possible;
7.
Intermittently tighten the brass nuts with a wrench in a sequence
that will pull the heat exchanger halves together evenly. Tighten
all nuts to 90 inch-lbs torque once and then alternately re-tighten
all nuts again to 100 inch-lb.
THE RE-TIGHTENING SEQUENCE
IS ABSOLUTELY NECESSARY TO ENSURE A TIGHT JOINT
;
8. Re-assemble the front panel, breach plate, Limit Control and
burner in reverse sequence to their removal;
9.
Follow the instructions for starting the burner for the first time to
cure the firepot and perform combustion checks. See Section
2.3.
3.1.3) Drawer
assembly
Remove the drawer assembly. Clean all foreign matter from the
retention head and electrodes. If a Beckett AFG burner has been
installed, the burner will have to be removed to check the retention
head.
3.1.4) Nozzle
Replace the nozzle with the one specified in Table 4.
3.1.5) Oil
filters
Tank filter
The tank filter should be replaced as required.
Secondary filter
The 10 (or less) micron filter cartridges should be replaced annually.
3.1.6) Air
filters
Air filters are the disposable type. They should be replaced at least
once a year. Dusty conditions, presence of animal hair etc. may
require much more frequent filter changes. Dirty filters will impact
furnace efficiency and increase oil consumption.
3.1.7) Motor
lubrication
Do NOT lubricate the oil burner motor or the direct drive blower motor
as they are permanently lubricated.
3.1.8) CAS-2B combustion air kit (chimney
venting)
If used, check the CAS-2B combustion air kit for proper operation.
Check to see that the inlet screen is not plugged. Block the air inlet
completely and ensure that a zero smoke reading results. If a zero
smoke reading is not obtained, set up the burner as indicated in Part
2, section 3.
Gradually block off the intake. The CO
2
should increase to a maximum
of 0.5 percentage points at the fully blocked condition. If not, check
that the VRV gate is pivoting freely and that the pivot rod is in a
horizontal position. Also, check that the counterweight has been
properly adjusted in accordance with CAS-2B installation instructions.
3.1.9) Blocked Vent Shut-Off (BVSO)
Cleaning
For continued safe operation, the Blocked Vent Shut-Off System
(BVSO) is required to be inspected and maintained annually by a
qualified agency.
1.
Disconnect the power to the appliance.
2.
Remove the two screws holding on the BVSO assembly cover.
3.
Remove the cover.
4. Remove the two screws holding the thermal switch to the
assembly base.
6.
Without removing the electrical wires, remove the thermal switch
and remove any build-up from the thermal switch surface.
CAUTION
Do not dent or scratch the surface of the thermal
switch. If the thermal switch is damaged,
replacement is required.
6.
Clear and remove any build-up or obstruction inside the heat
transfer tube.
7.
Re-mount the thermal switch to the assembly base.
8.
Re-attach the assembly cover with the screws removed in step 2.
9.
Re-establish power to the appliance.
20
445 01 4024 05
Summary of Contents for OCF105A12C
Page 22: ...DNS 0589 Rev C FIGURE 5 Models ODH53F100LB 3MC OCF105A12C 23 445 01 4024 05...
Page 23: ...24 FIGURE 6 Wiring diagram ODH53F100LB 3MC OCF105A12C 445 01 4024 05...
Page 24: ...COMPONENTS AND REPLACEMENT PARTS 25 445 01 4024 05...
Page 25: ...PARTS LIST Model ODH53F100LB 3MC OCF105A12C B50030A 26 445 01 4024 05...
