Page 22
31-5000723 Rev. 0
Operating Sequence
System Demand
System Response
System
Condition
Step
Thermostat
Demand
Relative Humidity
Compressor
Blower
CFM
(COOL)
Comments
1st
Stage
O
G
Status
D
NO CALL FOR DEHUMIDIFICATION
Normal Operation
1
On
On
On
Acceptable 24 VAC
High
100%
Compressor and indoor
blower follow thermostat
demand
BASIC MODE (only active on a Y1 thermostat demand)
Normal Operation
1
On
On
On
Acceptable 24 VAC
High
100%
Thermostat energizes Y1
and de-energizes D on a
call for de-humidification
Dehumidification
Call
2
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
High
100%
Dehumidification mode
begins when humidity is
greater than set point.
Maximum overcool from
cooling setpoint is 2°F.
Dehumidification
Call
2
On
On
On
Demand
0 VAC
High
70%
Dehumidification
Call ONLY
1
On
On
On
Demand
0 VAC
High
70%
Thermostat will keep
outdoor unit energized after
cooling temperature setpoint
has been reached in order
to maintain room humidity
setpoint. Maximum overcool
from cooling setpoint is 2°F.
•
On-board links at indoor unit with a single stage outdoor unit
•
With Condensing unit - Cut W914 (R to OS) on integrated control
•
With Heat Pump - Cut W914 (R to DS) and W951 (R to O) on integrated control
Table 13. Cooling Operating Sequence
NF97UM and Single Stage Outdoor Unit
