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)
• Motor runs at 50% for 30 seconds.
• Motor then runs at 82% for approximately 7-1/2 minu-
tes.
• If demand has not been satisfied after 7-1/2 minutes,
motor runs at 100% until demand is satisfied.
• Once demand is met, motor runs at 50% for 30 sec-
onds then ramps down to stop.
OFF___€
1/2 MIN
7 1/2 MIN __ 100% --I1_
82% CFM CFM OFF
COOLING DEMAND
Ramping Option B
• 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.
• Once demand is met, motor ramps down to stop.
(
__p 7 1/2 MIN _ 100% CFM
OFF 82%CFM /
COOLING DEMAND ---I1_
OFF
Ramping Option C
• Motor runs at 100% until demand is satisfied.
• Once demand is met, motor runs at 100% for 45 sec-
onds then ramps down to stop.
._p-- 100% CFM--
OFF OFF
-- DEMAND
Ramping Option D
• Motor runs at 100% until demand is satisfied.
• Once demand is met, motor ramps down to stop.
100% CFM _OFF
--t
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 27 for corresponding cfm values,
TABLE 15
Heating Mode Blower Speeds
Speed Switch 11 Switch 12
1 - Low On On
2 - Medium Low Off On
(Factory)
3 - Medium High On Off
4 - High Off Off
On-Board Jumper W914 -- Figure 56
On-board jumper W914, which connects terminals DS and
R on the integrated control board, must be cut when the fur-
nace is installed with either the Harmony Iti '" zone control
board or a thermostat which features humidity control. If
the jumper is left intact the PMW signal from the Harmony
III control will be blocked and also lead to control damage.
Refer to table 28 for operation sequence in applications in-
cluding G61MPV, a thermostat which features humidity
control and a single-speed outdoor unit. Table 29 gives the
operation sequence in applications with a two-speed out-
door unit.
On-Board Jumper W951 -- Figure 56
On-board jumper W951, which connects terminals R and O
on the integrated control board, must be cut when the fur-
nace is installed in applications which include a heat pump
unit and a thermostat which features dual fuel use. If the
jumper is left intact, terminal "O" will remain energized elim-
inating the HEAT MODE in the heat pump.
On-Board Jumper W915 -- Figure 56
On-board jumper W915, which connects terminals Y1 and
Y2 on the integrated control board, must be cut if two-stage
cooling will be used. If the jumper is not cut the outdoor unit
will operate in second-stage cooling only.
LEDs (SPEED, CFM, STATUS, E-COM) -- Figure 55
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 commands and inputs. The LED may
flash rapidly or may display a single flash, depending upon
the activity.
Page 42
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