Heating Mode Blower Speed - Lennox G60UHV Service Manual

Switches 11 and 12 −− Heating Mode Blower Speed −−
Switches 11 and 12 are used to select heating mode blower
motor speed. The unit is shipped from the factory with the
dip switches positioned for medium low (2) speed indoor
blower motor operation during the heating mode. The table
below provides the heating mode blower speeds that will
result from different switch settings. Refer to blower data
tables at the front of this manual for corresponding cfm val-
ues.
TABLE 11
Heating Mode Blower Speeds
Speed
1 − Low
2 − Medium Low
(Factory)
3 − Medium High
4 − High
On−Board Jumper W914
On−board jumper W914 connects terminals DS and R on
the integrated control board. W914 must be cut when the
furnace is installed with either the Harmony II zone control
board, the CCB1 EfficiencyPlus humidity control or Lennox
SignatureStatt. Refer to table 21 for operation sequence
in applications including a G60UHV, CCB1 and single−
speed outdoor unit. Table 22 gives the operation sequence
in applications with a two−speed outdoor unit. Refer to table
23 for operation sequence in applications including a
G60UHV, SignatureStat and single−speed outdoor unit.
Table 24 gives the operation sequence in applications with
a two−speed outdoor unit.
Switch 11 Switch 12
On On
Off On
On Off
Off Off
On−Board Jumper W951
On−board jumper W951 connects terminals R and O on the
integrated control board. W951 must be cut when the fur-
nace is installed in applications which include a heat pump
unit and the FM21 FuelMaster control board.
Factory−Installed Jumper Y1 to Y2
A factory−installed jumper from Y1 to Y2 terminals on the
integrated control board terminal strip must be removed if
two−stage cooling will be used.
Diagnostic LEDs (DS1 and DS2)
Two diagnostic LEDs are located on the two−stage, vari-
able speed integrated control just to the left of the first bank
of dip switches. These lights' flashes correspond with diag-
nostic codes detailed on in table 6.
Status LEDs (HEAT, HI/LO, ON/OFF and CFM)
The integrated control includes four LEDs which indicate
operating status. The green ON/OFF LED is lit any time the
blower is operating. The green CFM LED indicates the
blower motor speed. Count the number of blinks between
the two−second pauses to determine the CFM. Each blink
represents approximately 100 CFM. The yellow HI/LO LED
is lit when the W914 (DS to R) jumper has not been clipped
for SignatureStat, CCB1 or Harmony operation. The yellow
HEAT LED is lit when the indoor blower is operating at the
HEATING speed.
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