Lennox SL280UHNX Series Unit Information page 35

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Ramping Option A (Factory Selection)
Motor runs at 50% for 30 seconds.
Motor then runs at 82% for approximately 7-1/2
minutes.
If demand has not been satisfied after 7-1/2 min-
utes, motor runs at 100% until demand is satisfied.
Once demand is met, motor runs at 50% for 30
seconds 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 min-
utes, motor 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
Motor runs at 100% until demand is satisfied.
Once demand is met, motor runs at 100% for 45
seconds then ramps down to stop.
100% CFM
OFF
COMPRESSOR
DEMAND
Ramping Option D
Motor runs at 100% until demand is satisfied.
Once demand is met, motor ramps down to stop.
100% CFM
OFF
COMPRESSOR
DEMAND
100%
OFF
CFM
1/2 MIN
50% CFM
100% CFM
OFF
100% CFM
OFF
45 SEC.
OFF
Page 35
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 8 for
switches 11, 12 and 13 that provided the corresponding
increases or decrease to both high and low heat demand.
TABLE 8
Heating Mode Blower Speeds
Heat Speed
Switch 11
Increase 24%
On
Increase 18%
On
Increase 12%
On
Increase 6%
On
Factory Default
Off
Decrease 6%
Off
Decrease 12%
Off
Decrease 18%
Off
Switches 14 and 15 -- Continuous Blower Speed --
TABLE 9 provides continuous blower speed adjustments
that will result from different switch settings.
TABLE 9
Continuous Blower Speed
Continuous
Blower Speed
28% of High Cool Speed
38% of High Cool Speed
(Factory Setting)
On-Board Links
Note: Communicating systems with a conventional out-
door unit (non-communicating), the on-board clippable
links must be set to properly configure the system.
IMPORTANT
Carefully review all configuration information
provided. Failure to properly set DIP switches,
jumpers and on-board links can result in improper
operation!
On-Board Link W914 Dehum or Harmony (R to DS)
On-board link W914, is a clippable connection between
terminals R and DS on the integrated control. W914 must
be cut when the furnace is installed with either the Harmo-
ny III zone control or a thermostat which features humidity
control. If the link is left intact the PMW signal from the
ZSV Variable Zoning System control will be blocked and
also lead to control damage. Refer to TABLE 10 for oper-
ation sequence in applications including SL280, a thermo-
stat which features humidity control and a single-speed
outdoor unit. TABLE 11 gives the operation sequence in
applications with a two-speed outdoor unit.
Switch 12
Switch 13
On
On
On
Off
Off
On
Off
Off
Off
Off
Off
On
On
Off
On
On
Switch 14
Switch 15
Off
On
Off
Off

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