Lennox SL280DFNV Series Unit Information page 17

TABLE 8
Cooling Blower Speed Adjustment
Adjustment
+10% (approx)
Factory Default
-10% (approx)
Switches 9 and 10 -- Cooling Mode Blower Speed
Ramping -- Blower speed ramping may be used to en-
hance dehumidification performance. The switches are
factory set at option A which has the greatest effect on de-
humidification performance. TABLE 9 provides the cooling
mode blower speed ramping options that will result from
different switch settings. The cooling mode blower speed
ramping options are detailed below.
TABLE 9
Cooling Mode Blower Speed Ramping
Ramping
A (Factory)
B
C
D
Ramping Option A (Factory Selection)
• Motor runs at 50% for 30 seconds.
• Motor then runs at 82% for approximately 7-1/2 min-
utes.
• 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.
7 1/2 MIN
OFF
82% CFM
1/2 MIN
50% CFM
COMPRESSOR 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,mo-
tor runs at 100% until demand is satisfied.
• Once demand is met, motor ramps down to stop.
7 1/2 MIN
OFF
82%CFM
COMPRESSOR DEMAND
Switch 7 Switch 8
On Off
Off Off
Off Off
Switch 9 Switch 10
Off Off
Off On
On Off
On On
100%
CFM
1/2 MIN
50% CFM
100% CFM
• Motor runs at 100% until demand is satisfied.
• Once demand is met, motor runs at 100% for 45
seconds then ramps down to stop
OFF
• Motor runs at 100% until demand is satisfied.
• 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
provides factory default heat speed. Refer to TABLE 10 for
switches 11, 12 and 13 that provided the corresponding
increases or decrease to both high and low heat demand
Heat Speed
Increase 24%
Increase 18%
Increase 12%
Increae 6%
Factory
Default
Decrease 6%
Decrease
OFF
12%
Decrease
18%
Switches 14 and 15 -- Continuous Blower Speed --
TABLE 11 provides continuous blower speed adjustments
that will result from different switch settings.
Coninuous Blower Speed
28% of High Cool Speed
38% of High Cool Speed
OFF
(Factory)
70% of High Cool Speed
100% of High Cool Speed
Page 17
Ramping Option C
100% CFM
100% CFM
COMPRESSOR
45 SEC.
DEMAND
Ramping Option D
100% CFM
COMPRESSOR
DEMAND
TABLE 10
Heating Mode Blower Speeds
Switch 11 Switch 12
On On
On On
On Off
On Off
Off Off
Off Off
Off On
Off On
TABLE 11
Continuous Blower Speed
Switch 14
Off
Off
On
On
OFF
OFF
Switch 13
On
Off
On
Off
Off
On
Off
On
Switch 15
On
Off
Off
On