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CBA38MV-060 BLOWER PERFORMANCE
0 through 0.80 in. w.g. External Static Pressure Range
“ADJUST”
Jumper
Setting
Jumper Speed Positions
“HEAT” Speed
“COOL” Speed
1
2
3
4
1
2
3
4
cfm
cfm
cfm
cfm
cfm
cfm
cfm
cfm
+
1640
1840
2075
2150
1640
1840
2075
2150
NORM
1465
1625
1800
2000
1465
1625
1800
2000
–
1250
1390
1560
1720
1250
1390
1560
1720
NOTES - The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
First stage cooling air volume is 70% of COOL speed setting. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper selectable) of the
same second-stage COOL speed selected, minimum 450 cfm.
Lennox iHarmony
®
Zoning System applications - minimum blower speed is 450 cfm.
Unit Operating Sequences
This section details unit operating sequence for non-communicating systems. For communicating systems, see the
iComfort
®
thermostat installation instruction.
Table 10.
Air Handler with ComfortSense 7500 Thermostat and Single-Stage Outdoor
Unit Operating Sequence
Operating Sequence
System Demand
System Response
System
Condition
Step
Thermostat Demand
Relative Humidity
Comp
Air Han
-
dler 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%
Compressor and indoor
air handler follow ther-
mostat demand
BASIC MODE (Only active on a Y1 thermostat demand)
Normal
Operation
1
On
On On
Acceptable
24 VAC
High
100%
ComfortSense 7500
thermostat energizes Y1
and de-energizes D on a
call for dehumidification.
NOTE:
No over cool-
ing.
Dehumidification
Call
2
On
On On
Demand
0 VAC
High
70%
PRECISION MODE (Operates independent of a Y1 thermostat demand)
Normal
Operation
1
On
On On
Acceptable
24 VAC
High
100%
Dehumidification mode
begins when humidity is
greater than set point
Dehumidification
call
2
On
On On
Demand
0 VAC
High
70%
Dehumidification
call ONLY
1
On
On On
Demand
0 VAC
High
70%
ComfortSense 7500
will keep outdoor unit
energized after cooling
temperature setpoint has
been reach in order to
maintain room humidity
setpoint.
NOTE:
Allow to over
cool 2
0
F from
cooling set
point.
Summary of Contents for 16B27
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