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Operating Sequence
System Condition
Step
NO CALL FOR DEHUMIDIFICATION
Normal Operation Y1
1
Normal Operation Y2
2
ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING
BASIC MODE (only active on a Y1 thermostat demand)
Normal Operation
1
Dehumidification call
2
PRECISION MODE (operates independent of a Y1 demand)
Normal Operation
1
Dehumidification Call
2
Dehumidification Call
1
Only
ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING
BASIC MODE (only active on a Y1 thermostat demand)
Normal Operation
1
Dehumidification Call
2
PRECISION MODE (operates independent of a Y1 thermostat demand)
Normal Operation
1
Dehumidification Call
2
Dehumidification Call
1
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
*Normal operation first stage cooling blower speed is 70% COOL speed.
**Dehumidification blower speed is, reduced to 70% of COOL.
***In Precision mode, thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.
NF80XV, Thermostat with Humidity Control Feature and Two-Speed Outdoor Unit
31-5000734 Rev. 0
System Demand
Thermostat Demand
Y1
Y2
O
G
W1
W2
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 12. Operating Sequence
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
Low
Demand
0 VAC
High
Demand
0 VAC
High
control
®
control
®
Page 19
System Response
Blower
CFM
Comments
(cool)
Compressor and indoor
70%*
blower follow thermostat
100%
demand
70%*
Thermostat energizes Y1 and
de-energizes D on a call for
de-humidification
70%**
Dehumidification mode begins
70%*
when humidity is greater than
70%**
set point
Thermostat will try to maintain
room humidity setpoint by
70%**
allowing the room space
to maintain a cooler room
thermostat setpoint**
100%
Thermostat energizes Y2 and
de-energizes D on a call for
de-humidification
70%**
Dehumidification mode begins
70%*
when humidity is greater than
70%**
set point
Thermostat will try to maintain
70%**
room humidity setpoint by
allowing the room space
to maintain a cooler room
thermostat setpoint***
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