Lennox SL280UHNV - Page 33

Page 33
TABLE 12
Cooling Mode Blower Speed Ramping
Ramping Switch 9 Switch 10
A (Factory) O󰀨 O󰀨
B O󰀨 On
C On O󰀨
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 min-
utes.
• If demand has not been satised after 7-1/2 minutes,
motor runs at 100% until demand is satised.
• Once demand is met, motor runs at 50% for 30 sec-
onds then ramps down to stop.
OFF
OFF
1/2 MIN
50% CFM
COMPRESSOR DEMAND
7 1/2 MIN
82% CFM
100%
CFM
1/2 MIN
50% CFM
Ramping Option B
• Motor runs at 82% for approximately 7-1/2 minutes. If
demand has not been satised after 7-1/2 minutes,mo-
tor runs at 100% until demand is satised.
• Once demand is met, motor ramps down to stop.
OF
F
OFF
82%CFM
100% CFM
COMPRESSOR DEMAND
7 1/2 MIN
Ramping Option C
OF
F
OFF
100% CFM
100% CFM
45 SEC.
COMPRESSOR
DEMAND
• Motor runs at 100% until demand is satised.
• Once demand is met, motor runs at 100% for 45 sec-
onds then ramps down to stop.
Ramping Option D
• Motor runs at 100% until demand is satised.
• Once demand is met, motor ramps down to stop.
OFFOFF
100% CFM
COMPRESSOR
DEMAND
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 13 for
switches 11, 12 and 13 that provided the corresponding
increases or decrease to both high and low heat demand.
See Table 21 on page 57 for allowable heating speeds.
TABLE 13
Heating Mode Blower Speeds
Heat Speed Switch 11 Switch 12 Switch 13
Increase 24% On On On
Increase 18% On On O󰀨
Increase 12% On O󰀨 On
Increase 6% On O󰀨 O󰀨
Factory
Default
O󰀨 O󰀨 O󰀨
Decrease 6% O󰀨 O󰀨 On
Decrease
12%
O󰀨 On O󰀨
Decrease
18%
O󰀨 On On
Switches 14 and 15 -- Continuous Blower Speed
Table 14 provides continuous blower speed adjustments
that will result from dierent switch settings.
TABLE 14
Continuous Blower Speed
Continuous Blower Speed Switch 14 Switch 15
28% of High Cool Speed O󰀨 On
38% of High Cool Speed
(Factory)
O󰀨 O󰀨
NOTE - This instruction provides indoor blower CFM ta-
bles for bottom return air only. Refer to the Product Spec-
ications document for a complete list of CFM tables for
all applications.