Carrier 48VL-E Installation Instructions Manual page 29

48VL-(E, F): Installation Instructions
season. For the first heating season, inspect blower wheel bimonthly to
determine proper cleaning frequency.
To inspect blower wheel, remove draft hood assembly. Shine a flashlight
into opening to inspect wheel. If cleaning is required, remove
induced-draft blower assembly as follows:
1. Remove control access panel (See
2. Remove the 5 screws that attach induced-draft blower assembly to
the flue collector box cover.
3. Slide the assembly out of the unit. (See
wheel. If additional cleaning is required, continue with Steps 4 and
5.
4. To remove blower wheel, remove 1set screw.
5. To remove inducer motor, remove screws that hold the inducer
motor to the blower housing.
6. To reinstall, reverse the procedure outlined above.
Flue Gas Passageways
To inspect the flue collector box and upper areas of the heat exchanger:
1. Remove the induced draft blower assembly according to directions
in the Induced Draft Blower Assembly section.
2. Remove the 11 screws holding the flue collector box cover (See
Fig. 20) to the heat exchanger assembly. Inspect the heat
exchangers.
3. Clean all surfaces, as required, using a wire brush.
Limit Switch
Remove blower access panel (see
fan partition.
Burner Ignition
Unit is equipped with a direct spark ignition 100 percent lockout system.
Ignition module (IGC) is located in the control box (See
Module contains a self-diagnostic LED. During servicing, refer to label
diagram or Table 6 in these instructions for LED interpretation.
If lockout occurs, unit may be reset by either momentarily interrupting
power supply to unit or by turning selector switch to OFF position at the
thermostat.
NOTE: For Ultra Low NOx The combined flame sensor/sparker is
located on the right side of the burner box (See
sensor/sparker is accessible for service by removing the cover in the
right side panel. The burner thermal switch (BTS) is located on the top
of the burner box. For 60k heat sizes, the BTS switch is accessible
through the cover in the right side panel. For 90k heat sizes, the BTS
switch is accessible by removing the control access panel.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig. 21).
Fig. 20). Clean the blower
Fig. 21). Limit switch is located on the
Fig.
Fig. 19 The flame
Sparker &
Flame Sensor
Fig. 19 – Burner Thermal Switch (BTS) (Ultra Low NOx)
20).
BURNER BAFFLE BURNER BAFFLE
Fig. 20 – Blower Housing, Flue Collector Box and Burner Heat
Exchanger Assembly (Ultra Low NOx)
Ultra Low NOx Burner Baffle Inspection/Cleaning (See
Fig. 20.)
If the inlet side of the burner is required to be inspected and cleaned for
trouble shooting, the design allow accessing the burner without
removing the burner box from the heat exchanger assembly. This can be
done by removing the screws from the front cover of the burner box and
losing the screws on each side of the top cover to allow easy removal of
baffle from the burner box. Once the baffle is removed the inlet side of
the burner can be accessed and cleaned.
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90k BTS
60k BTS
Sparker &
Flame Sensor
REMOVE SCREWS
A200287
A200278