Lennox 16B27 User Manual

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

Lennox 16B27 Specifications

General

Brand	Lennox
Model	16B27
Category	Heat Pump
Language	English