Carrier T--298 - Manual (Page 28)

T--298 3-4
3.4 CEILING UNIT -- DUCTED SYSTEMS
3.4.1 Filter Removal
The filters (Figure 3-9) are located in the ceiling grill. To
remove the filters, do the following:
a. Grasp the edge of the filter at recess in the end of the
ceiling grill.
b. Pull filter completely out of the filter slot.
c. Vacuum filter or wash filter in luke--warm water.
Shake off excess water and dry thoroughly.
d. Replace filter by sliding the filter into the filter slot in
the ceiling grill until the filter frame is flush with the in-
terior grill.
Filters
Operation Indicators
Figure 3-9 Filter Removal -- Ducted Unit
3.4.2 Ceiling Grill Removal
To remove the ceiling grill (Figure 3--10) do the following:
a. Before working on unit place the master switch in the
OFF position and disconnect all electrical power.
b. Remove filters (Refer to paragraph 3.4.1).
c. Remove 4 screws located on the ceiling grill, (two are
under the filters) making sure to support the weight of
the grill.
d. Lower the ceiling grill from the ceiling panel.
e. To replace the grill, place the grill up against the ceil-
ing panel and align the screw holes in the grill with the
ceiling panel.
f. Replace 4 screws and 2 filters.
3.4.3 Control Box Assembly Removal
To remove the control box assembly (Figure 3-11 &
Figure 3-12) do the following:
a. Remove ceiling grill. Refer to paragraph 3.4.2.
b. Disconnect 115 volt (AC) and 12 volt (DC) power
wires.
c. Remove two screws securing control box cover to
control box assembly. See Figure 3-11.
d. Remove control box assembly cover.
Mounting Screws
Figure 3-10 Ceiling Grill -- Ducted
e. Disconnect blue furnace wires.
f. Unplug two connectors from upper unit.
g. Unplug DC power plug #1 (red/yellow/black wires)
See Figure 3-12
h. Unplug relay signal plug #2 (brown/red/orange/
yellow wires). See Figure 3-12
i. While supporting control box assembly remove two
screws securing control box assembly to ducted ceil-
ing unit.
j. Pull control box assembly from the ducted ceiling unit.
k. Reverse above procedure to reassemble.
Control Box
PCB Cover
Fuse
Control Box
Cover Screws
PCB Cover
Screws
Figure 3-11 Control Box & PCB Cover