Lennox SL280UHNV Installation Instructions Manual page 33
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Also See for SL280UHNV:
- Unit information (53 pages) ,
- Manual (50 pages) ,
- User's information manual (7 pages)
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TABLE 12
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
Ramping Option C
100% CFM
OFF
COMPRESSOR
DEMAND
• 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.
Switch 9
Switch 10
Off
Off
Off
On
On
Off
On
On
100%
CFM
1/2 MIN
50% CFM
100% CFM
100% CFM
45 SEC.
• 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 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.
Heating Mode Blower Speeds
Heat Speed
Increase 24%
Increase 18%
Increase 12%
Increase 6%
OFF
Factory
Default
Decrease 6%
Decrease
12%
Decrease
18%
Switches 14 and 15 -- Continuous Blower Speed
Table 14 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)
OFF
NOTE - This instruction provides indoor blower CFM ta-
bles for bottom return air only. Refer to the Product Spec-
ifications document for a complete list of CFM tables for
all applications.
Page 33
Ramping Option D
100% CFM
OFF
COMPRESSOR
DEMAND
TABLE 13
Switch 11
Switch 12
On
On
On
On
On
Off
On
Off
Off
Off
Off
Off
Off
On
Off
On
TABLE 14
Switch 14
Off
Off
Switch 13
On
Off
On
Off
Off
On
Off
On
Switch 15
On
Off
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