Lennox SLP99UHV Series Unit Information page 25

Switches 10 and 11 -- Cooling Mode Blower Speed Ad-
justment -- Switches 10 and 11 are used to select blower
speed adjustment settings. The unit is shipped from the
factory with the DIP switches positioned for NORMAL (no)
adjustment. The DIP switches may be positioned to adjust
the blower speed by +10% or -10% to better suit the ap-
plication.
TABLE 7 provides blower speed adjustments that will re-
sult from different switch settings. Refer to blower tables at
the front of this manual for corresponding cfm values. With
switches 10 and 11 set to ON, motor will bypass ramp-
ing profiles and all delays and immediately upon a call for
cool, run at COOLING speed selected. LED will continue
to operate as normal. This mode is used to check motor
operation.
TABLE 7
Cooling Mode Blower Speed Adjustment
Adjustment Switch 10
+10% (approx.)
Default Cool CFM
- 10% (approx.)
Motor Test
Switches 12 and 13 -- Cooling Mode Blower Speed
Ramping - Switches 12 and 13 are used to select cool-
ing mode blower speed ramping options. Blower speed
ramping may be used to enhance dehumidification perfor-
mance. The switches are factory set at option A which has
the greatest effect on blower motor performance. TABLE 8
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 8
Cooling Mode Blower Speed Ramping
Ramping Option Switch 12
A (factory)
B
C
D
Switch 11
On Off
Off Off
Off On
On On
Switch 13
Off Off
On Off
Off On
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 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.
OFF
1/2 MIN
50% CFM
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
Ramping Option C
• 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.
OFF
COOLING DEMAND
Ramping Option D
• Motor runs at 100% until demand is satisfied.
• Once demand is met, motor ramps down to stop.
OFF
Page 25
7 1/2 MIN 100%
82% CFM CFM
COOLING DEMAND
100% CFM
COOLING DEMAND
100% CFM
100% CFM
45 SEC.
100% CFM
OFF
COOLING
DEMAND
OFF
1/2 MIN
50% CFM
OFF
OFF