Lennox SLP98UHV - Revisions; Document Changes

Page 40
Switches 8 and 9 - Cooling Mode Blower Speed
The unit is shipped from the factory with the DIP switches
positioned for high speed (4) indoor blower motor opera-
tion 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 16
Cooling Mode Blower Speeds
Speed Switch 8 Switch 9
1 - Low On On
2 - Medium Low Off On
3 - Medium High On Off
4 - High Factory Off Off
Switches 10 and 11 - Cooling Mode Blower Speed Adjustment
The unit is shipped from the factory with the DIP switches
positioned for NORMAL (no) adjustment. The DIP switch-
es may be positioned to adjust the blower speed by +10%
or -10% to better suit the application. Table 17 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
ramping proles and all delays and will immediately run
at selected COOLING speed upon a call for cool. LED will
continue to operate as normal. This mode is used to check
motor operation.
TABLE 17
Cooling Mode Blower Speed Adjustment
Adjustment Switch 10 Switch 11
+10% (approx.) On Off
Default Cool CFM Off Off
- 10% (approx.) Off On
Motor Test On On
Switches 12 and 13 - Cooling Mode Blower Speed Ramping
Blower speed ramping may be used to enhance dehu-
midication performance. The switches are factory set at
option A which has the greatest effect on blower motor
performance. Table 18 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 prole only
applies during heat pump operation in dual fuel applica-
tions.
TABLE 18
Cooling Mode Blower Speed Ramping
Ramping Option Switch 12 Switch 13
A (factory) On Off
B Off Off
C Off On
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
COOLING 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.
OFF
OFF
82%CFM
100% CFM
COOLING DEMAND
7 1/2 MIN
Ramping Option C
• 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.
OFF
OFF
100% CFM
100% CFM
COOLING DEMAND
45 SEC.
Ramping Option D
• Motor runs at 100% until demand is satised.
• Once demand is met, motor ramps down to stop.
OFFOFF
100% CFM
COOLING
DEMAND