Page 29
TABLE 14
Cooling Mode Blower Speed Ramping
Ramping Option
Switch 9
Switch 10
A (Factory)
Off
Off
B
On
Off
C
Off
On
D
On
On
Ramping Option A (Factory Selection)
D
Motor runs at 50% for 30 seconds.
D
Motor then runs at 82% for approximately 7−1/2 minu-
tes.
D
If demand has not been satisfied after 7−1/2 minutes,
motor runs at 100% until demand is satisfied.
D
Once demand is met, motor runs at 50% for 30 sec-
onds then ramps down to stop.
OFF
OFF
1/2 MIN
50% CFM
COOLING DEMAND
7 1/2 MIN
82% CFM
100%
CFM
1/2 MIN
50% CFM
Ramping Option B
S
Motor runs at 82% for approximately 7−1/2 minutes. If
demand has not been satisfied after 7−1/2 minutes,
motor runs at 100% until demand is satisfied.
S
Once demand is met, motor ramps down to stop.
OFF
OFF
82%CFM
100% CFM
COOLING DEMAND
7 1/2 MIN
Ramping Option C
S
Motor runs at 100% until demand is satisfied.
S
Once demand is met, motor runs at 100% for 45 sec-
onds then ramps down to stop.
OFF
OFF
100% CFM
100% CFM
DEMAND
45 SEC.
Ramping Option D
S
Motor runs at 100% until demand is satisfied.
S
Once demand is met, motor ramps down to stop.
OFF
OFF
100% CFM
COOLING
DEMAND
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 tables 16
through 25 for corresponding cfm values.
TABLE 15
Heating Mode Blower Speeds
Speed
Switch 11
Switch 12
1 − Low
On
On
2 − Medium Low
(Factory)
Off
On
3 − Medium High
On
Off
4 − High
Off
Off
On−Board Link W914
On−board link W914, is a clippable connection between ter-
minals DS and R on the integrated control. W914 must be
cut when the furnace is installed with either the Harmony
III
t
zone control or a thermostat which features humidity
control. If the link is left intact the PMW signal from the Har-
mony III control will be blocked and also lead to control
damage. Refer to table 27 for operation sequence in ap-
plications including G60UHV, a thermostat which features
humidity control and a single−speed outdoor unit. Table 28
gives the operation sequence in applications with a two−
speed outdoor unit.
On−Board Link W951
On−board link W951 is a clippable connection between ter-
minals R and O on the integrated control. W951 must be cut
when the furnace is installed in applications which include a
heat pump unit and a thermostat which features dual fuel
use. If the link is left intact, terminal O" will remain ener-
gized eliminating the HEAT MODE in the heat pump.
On−Board Link W915
On−board link W915 is a clippable connection between ter-
minals Y1 and Y2 on the integrated control. W915 must be
cut if two−stage cooling will be used. If the link is not cut the
outdoor unit will operate in second−stage cooling only.
Status LEDs (SPEED, CFM, STATUS, E−COM)
The green SPEED LED indicates circulating blower speed
in response to the DS signal. The LED is lit during normal
blower operation and is off during a dehumidification de-
mand. In Harmony III applications, the brightness of the
LED indicates the requested blower speed.
The green CFM LED indicates the blower air flow. Count
the number of blinks between the two−second pauses to
determine the CFM. Each blink represents approximately
100 CFM.
The STATUS LED flashes diagnostic codes, which are de-
tailed on page 43.
The green E−COM LED indicates that the control is receiv-
ing and processing of commands and inputs. The LED may
flash rapidly or may display a single flash, depending upon
the activity.
