Lennox SL280DFNV Installation Instructions Manual page 35

SL280DFV Non-Communicating Thermostat with Humidity Control Feature and Single-Speed Outdoor Unit
OPERATING SEQUENCE
System
Step
Condition
NO CALL FOR DEHUMIDIFICATION
Normal Operation 1
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
Jumpers at indoor unit with a single stage outdoor unit. 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
*Dehumidification blower speed is 70% of COOL speed for all units .
**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 O G W1
On On On
On On On
On On On
On On On
On On On
On On On
TABLE 17
Relative Humidity
Status D
24
Acceptable
VAC
24
Acceptable
VAC
Demand 0 VAC
24
Acceptable
VAC
Demand 0 VAC
Demand 0 VAC
Page 35
SYSTEM RESPONSE
Blower
Compre
CFM
ssor
(cool)
Compressor and
High 100% indoor blower follow
thermostat demand
ComfortSense® 7500
High 100%
thermostat energizes
Y1 and de-energizes
D on a call for de-
High 70%*
humidification
Dehumidification
High 100%
mode begins when
humidity is greater
High 70%*
than set point
ComfortSense®
7500 thermostat will
try to maintain room
humidity setpoint by
High 70%*
allowing the room
space to maintain
a cooler room
thermostat setpoint**
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