Lennox G17Q2-50, Unit Information

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CLEANING HEAT
EXCHANGER
FIGURE 18
Connect chain to rod and drop chain
down through top of heat exchanger.
Connect at bottom to another rod. Move
rods up and down, back and forth to
clean heat exchanger.
Page 10
BLOWER SPEED SELECTION
G17Q3/4-100
G17Q2-50*
G17Q3-75
G17Q5/6-100
G17Q5/6-125
UNIT
Factory Connected
Speed Taps
Motor Speeds
Available
Cool Heat
2 3 3
2 4 4
2 4 4
3 4 5
3 5 5
*DO NOT USE LOW SPEED TAP ON Q2-50
BLOWER SPEED SELECTION
HI LOW
2 3 4 5
2 3 4 5 6
SPEE
D
TAPS
4
5
TABLE 7
◊
◊
◊
MOTOR PLUG SPEED TAP DESIGNATION
2 3 4
◊
3
9- Depress harness connector tab to release wire termiĆ
nal. Select connector location for new speed (refer to
unit wiring diagram). Insert wire terminal until it is seĆ
curely in place. See figure 16.
10- Replace harness connector to motor .
FIGURE 16
BLOWER SPEED TAP SELECTION
HARNESS
CONNECTOR
MOTOR
DEPRESS TAB TO RELEASE
WIRE TERMINAL. SELECT
CONNECTOR LOCATION
FOR NEW SPEED (REFER TO
UNIT WIRING DIAGRAM). INĆ
SERT WIRE UNTIL IT IS SEĆ
CURELY IN PLACE.
VII-MAINTENANCE
At the beginning of each heating season, the system
should be checked as follows:
A-Filters and Filter Springs
G17 units use a cleanable hogshair-type filter. Holding springs
lock filter in place by securing hook in holes provided in unit.
G17 units are factory shipped for side air return. Bottom filter
applications for use on G17Q5/6-100 and G17Q5/6-125 reĆ
quire an optional kit available from Lennox. G17X models are
factory equipped for use with bottom return air only. If side reĆ
turn air is desired, an optional kit is available. See figure 17.
Filters must be cleaned or replaced when dirty to assure
proper unit operation. Replace with same hogshair-type
filter material cut to specific measurements for each unit
as outlined in the specification table in this manual.
The factory supplied filter can be washed with cold water.
Direct water through filters in the opposite direction of air
flow. When dry, replace filter and reconnect springs. Refer
to figure 17 for spring position.
CRIMP THIS END
OF SPRING
FILTER RETENTION SPRING LOCATION
FOR BOTTOM RETURN AIR OPENING
CRIMP THIS END
OF SPRING
FILTER RETENTION SPRING LOCATION
FOR SIDE RETURN AIR OPENING
FIGURE 17
FINGER
LOOPS
FINGER
LOOP
FINGER
LOOP
CABINET
CABINET
B-Cleaning Heat Exchanger and Burners
NOTE-Use papers or protective covering in front of furĆ
nace while cleaning furnace.
To clean heat exchanger:
1- Turn off both electrical
and gas power supplies
to furnace. Refer to figĆ
ures 1 and 12 during disĆ
assembly and reassembĆ
ly procedures.
2- Remove upper and lower
access panels.
3- Remove screws holding
burner box damper in
place and remove burner
box damper assembly and damper prove switch covĆ
er.
4- Remove screws securing removable burner box covĆ
er and remove burner box cover.
5- Remove flue pipe and draft hood.