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Lennox SIGNATURE SL280UHV Installation Instructions Manual page 50

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SL280UHV, Non−Communicating Thermostat with Humidity Control Feature and Two−Speed Outdoor Unit
OPERATING
SEQUENCE
System
Ste
Condition
p
Y1
NO CALL FOR DEHUMIDIFICATION
Normal Opera-
1
On
tion − Y1
Normal Opera-
2
On On
tion − Y2
ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING
BASIC MODE (only active on a Y1 thermostat demand)
Normal Opera-
1
On
tion
Dehumidification
2
On On
Call
PRECISION MODE (operates independent of a Y1 thermostat demand)
Normal Opera-
1
On
tion
Dehumidification
2
On On
call
Dehumidification
1
On On
call ONLY
ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING
BASIC MODE (only active on a Y1 thermostat demand)
Normal Opera-
1
On On
tion
Dehumidification
2
On On
Call
PRECISION MODE (operates independent of a Y1 thermostat demand)
Normal Opera-
1
On
tion
Dehumidification
2
On On
call
Dehumidification
1
On On
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
With Heat Pump − Cut W914 (R to DS) & W951 (R to O) on SureLight
®
Dave Lennox ComfortSense
7000 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
OPERATING SEQUENCE
SYSTEM DEMAND
Thermostat Demand
Relative Humidity
W
W
Y2
O
G
1
2
On
On
Acceptable
On
On
Acceptable
On
On
Acceptable
On
On
On
On
Acceptable
On
On
On
On
On
On
Acceptable
On
On
On
On
Acceptable
On
On
On
On
®
7000 thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.
TABLE 19
Compressor
Status
D
24
Low
VAC
24
High
VAC
24
Low
VAC
0
Demand
High
VAC
24
Low
VAC
0
Demand
High
VAC
0
Demand
High
VAC
24
High
VAC
0
Demand
High
VAC
24
Low
VAC
0
Demand
High
VAC
0
Demand
High
VAC
®
control
Page 50
SYSTEM RESPONSE
Blower
CFM
Comments
(COOL)
70%*
Compressor and indoor
blower follow thermostat
demand
100%
ComfortSense
70%*
thermostat energizes Y2
and de−energizes D on a
70%**
call for de−humidification
70%*
Dehumidification mode
begins when humidity is
greater than set point
70%**
ComfortSense
thermostat will try to
maintain room humidity
setpoint by allowing the
70%**
room space to maintain a
cooler room thermostat
setpoint***
ComfortSense
100%
thermostat energizes Y2
and de−energizes D on a
70%**
call for de−humidification
70%*
Dehumidification mode
begins when humidity is
greater than set point
70%**
ComfortSense
70%**
thermostat will try to
maintain room humidity
setpoint by allowing the
room space to maintain a
cooler room thermostat
setpoint***
®
control
®
7000
®
7000
®
7000
®
7000

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