Lennox SLP98UHV Installation Instructions Manual page 41

Switches 8 and 9 −− Cooling Mode Blower Speed −− The
unit is shipped from the factory with the DIP switches posi-
tioned for high speed (4) indoor blower motor operation
during the cooling mode. The table below provides the
cooling mode blower speeds that will result from different
switch settings. Refer to tables beginning on page 42 for
corresponding cfm values.
TABLE 17
Cooling Mode Blower Speeds
Speed
1 − Low
2 − Medium Low
3 − Medium High
4 − High (Factory)
Switches 10 and 11 −− Cooling Mode Blower Speed Ad-
justment −− 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 application. Table
18 provides blower speed adjustments that will result from
different switch settings. Refer to tables beginning on page
42 for corresponding cfm values.
With switches 10 and 11 set to ON, motor will bypass ramp-
ing profiles and all delays and will immediately run at se-
lected COOLING speed upon a call for cool. LED will con-
tinue to operate as normal. This mode is used to check
motor operation.
TABLE 18
Cooling Mode Blower Speed Adjustment
Adjustment
+10% (approx.)
DEFAULT COOL CFM
−10% (approx.)
MOTOR TEST
Switches 12 and 13 −− 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
blower motor performance. Table 19 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.
NOTE − The off portion of the selected ramp profile only ap-
plies during heat pump operation in dual fuel applications.
Switch 8 Switch 9
On On
Off On
On Off
Off Off
Switch 10 Switch 11
On Off
Off Off
Off On
On On
Cooling Mode Blower Speed Ramping
Ramping Option
A (Factory)
B
C
D
Ramping Option A (Factory Selection)
D Motor runs at 50% for 30 seconds.
D Motor then runs at 82% for approximately 7−1/2 minu-
tes.
D If demand has not been satisfied after 7−1/2 minutes,
motor runs at 100% until demand is satisfied.
D Once demand is met, motor runs at 50% for 30 sec-
onds then ramps down to stop.
OFF
1/2 MIN
50% CFM
S Motor runs at 82% for approximately 7−1/2 minutes. If
demand has not been satisfied after 7−1/2 minutes,
motor runs at 100% until demand is satisfied.
S Once demand is met, motor ramps down to stop.
OFF
S Motor runs at 100% until demand is satisfied.
S Once demand is met, motor runs at 100% for 45 sec-
onds then ramps down to stop.
OFF
Ramping Option D
S Motor runs at 100% until demand is satisfied.
S Once demand is met, motor ramps down to stop.
OFF
Page 41
TABLE 19
Switch 12
Off
On
Off
On
7 1/2 MIN 100%
82% CFM CFM
COOLING DEMAND
Ramping Option B
7 1/2 MIN
100% CFM
82%CFM
COOLING DEMAND
Ramping Option C
100% CFM
100% CFM
COOLING DEMAND
45 SEC.
100% CFM
OFF
COOLING
DEMAND
Switch 13
Off
Off
On
On
OFF
1/2 MIN
50% CFM
OFF
OFF