Page 15
E--Blower Speed Taps Leaded Motors
--2 Models
Blower speed tap changes are made on the SureLight
control board. See figure 2. Unused taps must be se-
cured on dummy terminals PARK M1 and or PARK
M2 on the SureLight board. The heating tap is con-
nected to the ACB HEAT terminal and the cooling tap
is connected to the ACB COOL terminal. The continu-
ous blower tap is connected to the ACB LOW termi-
nal.
To change existing heat tap, turn off power then switch
out speed tap on ACB HEAT with tap connected to
PARK M1 or PARK M2. See table 12 for blower mo-
tor tap colors for each speed.
TABLE 11
TABLE 12
FIGURE 19
BLOWER SPEED TAP SELECTION
Leadless Motors
HARNESS
CONNECTOR
MOTOR
DEPRESS TAB TO RELEASE
WIRE TERMINAL. SELECT
CONNECTOR LOCATION
FOR NEW SPEED (REFER TO
UNIT WIRING DIAGRAM).
INSERT WIRE UNTIL IT IS SE-
CURELY IN PLACE.
VI--MAINTENANCE
WARNING
Disconnect power before servicing unit.
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At the beginning of each heating season, the system
should be checked as follows:
Blowers
Check and clean blower wheels for any debris. Blower
motors are prelubricated for extended bearing life. No
further lubrication is needed.
Filters
All G27M filters are installed external to the unit. Filters
should be inspected monthly and cleaned or replaced
when necessary to assure proper furnace operation.
See table 13 for filter sizes. Replacement filters for
G27M--60/75 units must have a minimum velocity rat-
ing of 400 FPM. Replacement filters for G27M--100/120
units require a minimum velocity rating of 625 FPM.
TABLE 13
FILTER SIZE
MODEL NO.
UPFLOW / HORIZ.
(1 filter)
DOWNFLOW
(2 filters)
G27M--60/75 16 x 20 x 1 16 x 20 x 1
G27M--100/120 20 x 20 x 1 16 x 20 x 1
WARNING
Blower door must be securely in place when blow-
er and burners are operating. Gas fumes, which
could contain carbon monoxide, can be drawn
into living space resulting in personal injury or
death.
Flue And Chimney
Check flue pipe, chimney and all connections for tight-
ness and to make sure there is no blockage. Draft at flue
collar should always be negative.
Burners
Burners and burner flame should be inspected at the
beginning of each heating season. Clean burners, if
necessary, as outlined below:
1 -- Turn off electrical and gas supply to unit.
2 -- Disconnect gas supply piping and remove gas
manifold.
3 -- Disconnect ignitor and flame sensor leads.
4 -- Remove burner tray and burners.
5 -- Clean burner retention ring with wire brush as
shown in figure 20.
6 -- Use test tube brush to clea n inside of each burner.
7 -- Replace burners and burner tray, making sure
burners are properly seated in slots on tray and ori-
fice in manifold.
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