Table 15; Switch 10; On Off; Factory) Off Off - Lennox SL280UHV Installation Instructions Manual

TABLE 15

Cooling Mode Blower Speed Ramping
Ramping Option
A (Factory)
B
C
D
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.
7 1/2 MIN
OFF
82% CFM
1/2 MIN
50% CFM
COMPRESSOR DEMAND
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.
7 1/2 MIN
OFF 82%CFM
COMPRESSOR DEMAND
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.
100% CFM
OFF
COMPRESSOR
DEMAND
Switch 9

Switch 10

Off Off
Off On
On Off
On On
100%
OFF
CFM
1/2 MIN
50% CFM
100% CFM
100% CFM
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
Switches 11, 12 and 13 −− Heating Mode Blower Speed −−
The switches are factory set to the OFF position which pro-
vides factory default heat speed. Refer to table 16 for
switches 11, 12 and 13 that provided the corresponding in-
creases or decrease to both high and low heat demand.
Heating Mode Blower Speeds
Heat Speed
Increase 24%
Increase 18%
Increase 12%
Increase 6%
Factory Default
Decrease 6%
Decrease 12%
Decrease18%
Switches 14 and 15 −− Continuous Blower Speed −−
Table 17 provides continuous blower speed adjustments
that will result from different switch settings.
OFF
Continuous Blower Speed
Continuous
Blower Speed
28% of High Cool Speed
38% of High Cool Speed
(Factory)
70% of High Cool Speed
OFF
100% of High Cool Speed
Page 37
100% CFM
OFF
COMPRESSOR
DEMAND
TABLE 16
Switch Switch Switch
11 12
On On
On On
On Off
On Off
Off Off
Off Off
Off On
Off On
TABLE 17
Switch 14 Switch 15
Off
Off
On
On
13
On
Off
On
Off
Off
On
Off
On
On
Off
Off
On