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Lennox DAVE SIGNATURE SL280DFV Installation Instructions Manual page 37

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SL280DFV, Non-Communicating Thermostat with Humidity Control Feature and Two-Speed Outdoor Unit
OPERATING
SEQUENCE
System
Step
Condition
NO CALL FOR DEHUMIDIFICATION
Normal Operation
1
Y1
Normal Operation
2
Y2
ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING
BASIC MODE (only active on a Y1 thermostat demand)
Normal Operation
1
Dehumidification
2
call
PRECISION MODE (operates independent of a Y1 demand)
Normal Operation
1
Dehumidification
2
Call
Dehumidification
1
Call Only
ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING
BASIC MODE (only active on a Y1 thermostat demand)
Normal Operation
1
Dehumidification
2
Call
PRECISION MODE (operates independent of a Y1 thermostat demand)
Normal Operation
1
Dehumidification
2
Call
Dehumidification
1
Call ONLY
Jumpers at indoor unit with a two stage outdoor unit
Cut factory jumper from Y1 to Y2 or cut W915 (Y1 to Y2)
With Condensing unit - Cut W914 (R to DS) on SureLight® control
With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight® control
Dave Lennox ComfortSense® 7500 thermostat to use for this application - Y2081 4 heat / 2 cool
*Normal operation first stage cooling blower speed is 70% COOL speed.
**Dehumidification blower speed is, reduced to 70% of COOL.
***In Precision mode, ComfortSense® 7000 thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.
OPERATING SEQUENCE
SYSTEM DEMAND
Thermostat Demand
Y1
Y2
O
G
W1
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
TABLE 18
Relative Humidity
W2
Status
D
24
Acceptable
VAC
24
Acceptable
VAC
24
Acceptable
VAC
0
Demand
VAC
24
Acceptable
VAC
0
Demand
VAC
0
Demand
VAC
24
Acceptable
VAC
0
Demand
VAC
24
Acceptable
VAC
0
Demand
VAC
0
Demand
VAC
Page 37
SYSTEM RESPONSE
Blower
Compre
CFM
ssor
(cool)
Low
70%*
Compressor and indoor
blower follow thermostat
demand
High
100%
ComfortSense® 7500
Low
70%*
thermostat energizes Y1
and de-energizes D on a
High
70%**
call for de-humidification
Low
70%*
Dehumidification mode
begins when humidity is
greater than set point
High
70%**
ComfortSense® 7500
thermostat will try to
maintain room humidity
High
70%**
setpoint by allowing the
room space to maintain
a cooler room thermostat
setpoint**
ComfortSense® 7500
High
100%
thermostat energizes Y2
and de-energizes D on a
High
70%**
call for de-humidification
Low
70%*
Dehumidification mode
begins when humidity is
greater than set point
High
70%**
ComfortSense® 7500
High
70%**
thermostat will try to
maintain room humidity
setpoint by allowing the
room space to maintain
a cooler room thermostat
setpoint***
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