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Lennox 16B27 Manuallines page 18

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Table 11. Air Handler with ComfortSense 7500 Thermostat and Two-Stage
Operating Sequence
System
Step
Condition
Normal
Operation
1
- Y1
Normal
Operation
2
- Y2
BASIC MODE (Only active on a Y1 thermostat demand)
Normal
1
Operation
Dehumidification
2
Call
PRECISION MODE (Operates independent of a Y1 thermostat demand)
Normal
1
Operation
Dehumidification
2
call
Dehumidification
1
call ONLY
BASIC MODE (Only active on a Y1 thermostat demand)
Normal
1
Operation
Dehumidification
2
Call
PRECISION MODE (Operates independent of a Y1 thermostat demand)
Normal
1
Operation
Dehumidification
2
call
Dehumidification
1
call ONLY
Outdoor Unit Operating Sequence
System Demand
Thermostat Demand
Y1
Y2
O
G
W1
W2
No Call for Dehumidification
On
On
On
On
On
On
On
Room Thermostat Calls for First-Stage Cooling
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
Room Thermostat Calls for First- and Second-Stage Cooling
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
Relative Humidity
Compressor
Status
D
Acceptable 24 VAC
Low
Acceptable 24 VAC
High
Acceptable 24 VAC
Low
Demand
0 VAC
High
Acceptable 24 VAC
Low
Demand
0 VAC
High
Demand
0 VAC
High
Acceptable 24 VAC
High
Demand
0 VAC
High
Acceptable 24 VAC
High
Demand
0 VAC
High
Demand
0 VAC
High
Page 18
System Response
Air
Handler
Comments
CFM
(COOL)
70%
Compressor and indoor air
handler follow thermostat
demand
100%
ComfortSense 7500
70%
thermostat energizes Y2 and
de-energizes D on a call for
dehumidification
70%
NOTE: No over cooling.
70%
Dehumidification mode begins
when humidity is greater than
set point
70%
ComfortSense 7500
thermostat will keep outdoor
unit energized after cooling
temperature setpoint has been
reached in order to maintain
70%
room humidity setpoint.
NOTE: Allow to over cool
20F from cooling set
point.
ComfortSense 7500
100%
thermostat energizes Y2 and
de-energizes D on a call for
dehumidification
70%
NOTE: No over cooling.
100%
Dehumidification mode begins
when humidity is greater than
set point
70%
ComfortSense 7500
thermostat will keep outdoor
unit energized after cooling
temperature setpoint has been
reached in order to maintain
70%
room humidity setpoint.
NOTE: Allow to over cool
20°F from cooling set
point.
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