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TABLE 8
BLOWER DATA
CBA25UHV-048 BLOWER PERFORMANCE
0 through 0.80 in. w.g. External Static Pressure Range
“ADJUST”
Jumper
Setting
Jumper Speed Positions
“HEAT” Speed First Stage “COOL” Speed Second Stage “COOL” Speed
1 2 3 4 1 2 3 4 1 2 3 4
cfm cfm cfm cfm cfm cfm cfm cfm cfm cfm cfm cfm
+ 1375 1600 1820 2185 960 1125 1285 1620 1375 1600 1820 2185
NORM 1260 1455 1655 2085 885 1035 1185 1475 1260 1455 1655 2085
– 1125 1310 1490 1885 790 925 1060 1330 1125 1310 1490 1885
NOTES - The eect of static pressure, lter and electric heater resistance is included in the air volumes listed.
First stage cooling air volume is 70% of COOL speed setting. Continuous blower speed is approximately 50% of COOL speed setting.
Lennox Harmony III™ Zoning System applications - minimum blower speed is 450 cfm.
TABLE 9
BLOWER DATA
CBA25UHV-060 BLOWER PERFORMANCE
0 through 0.80 in. w.g. External Static Pressure Range
“ADJUST”
Jumper
Setting
Jumper Speed Positions
“HEAT” Speed First Stage “COOL” Speed Second Stage “COOL” Speed
1 2 3 4 1 2 3 4 1 2 3 4
cfm cfm cfm cfm cfm cfm cfm cfm cfm cfm cfm cfm
+ 1600 1835 2030 2190 1110 1285 1380 1615 1600 1835 2030 2190
NORM 1465 1675 1855 2085 1000 1160 1250 1470 1465 1675 1855 2085
– 1320 1500 1675 1890 895 1035 1115 1320 1320 1500 1675 1890
NOTES - The eect of static pressure, lter and electric heater resistance is included in the air volumes listed.
First stage cooling air volume is 70% of COOL speed setting. Continuous blower speed is approximately 50% of COOL speed setting.
Lennox Harmony III™ Zoning System applications - minimum blower speed is 450 cfm.
TABLE 10. CBA25UHV Thermostat and Single-Stage Outdoor Unit Operating Sequence
Operating Sequence System Demand System Response
System
Condition
Step
Thermostat Demand Relative Humidity
pressor
Air
Handler
CFM
(COOL)
Comments
Y1 Y2 O G W1 W2 Status D
NO CALL FOR DEHUMIDIFICATION
Normal Operation 1 On On On Acceptable 24 VAC High 100%
low thermostat demand
BASIC MODE (only active on a Y1 thermostat demand)
Normal
Operation
1 On On On Acceptable 24 VAC High 100%
gizes D on a call for dehumidification
Dehumidification Call 2 On On On Demand 0 VAC High
60%/65
70%*
PRECISION MODE (operates independent of a Y1 thermostat demand)
Normal Operation 1 On On On Acceptable 24 VAC High 100%
midity is greater than set point
Dehumidification Call 2 On On On Demand 0 VAC High
60%/65%
70%*
Dehumidification Call
ONLY
1 On On On Demand 0 VAC High
60%/65%
70%*
midity setpoint by allowing the room
mostat setpoint**
Jumpers at indoor unit with a single stage outdoor unit
With Condensing unit - Y1 to Y2 and R to O
With Heat Pump - Y1 to Y2
* During dehumidification, cooling air handler speed is as follows: 70% of COOL cfm for 018, 024, 030; 65% for 036; 60% for 042, 048 and 060 units.
** Thermostat will maintain the room temperature up to 2°F (1.2°C) cooler than the room thermostat setting in precision mode.
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