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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 thermostat demand)
Normal Operation
1
Dehumidification
2
Call
Dehumidification
1
Call ONLY
• 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
System Demand
Thermostat
Relative Humidity
Demand
1st
O
G
Status
Stage
On
On
On
Acceptable
On
On
On
Acceptable
On
On
On
Demand
On
On
On
Acceptable
On
On
On
Demand
On
On
On
Demand
Table 13. Cooling Operating Sequence
NF97UM and Single Stage Outdoor Unit
Compressor
D
24 VAC
High
24 VAC
High
0 VAC
High
24 VAC
High
0 VAC
High
0 VAC
High
Page 22
System Response
Blower
CFM
Comments
(COOL)
Compressor and indoor
100%
blower follow thermostat
demand
100%
Thermostat energizes Y1
and de-energizes D on a
call for de-humidification
70%
Dehumidification mode
100%
begins when humidity is
greater than set point.
Maximum overcool from
70%
cooling setpoint is 2°F.
Thermostat will keep
70%
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.
31-5000723 Rev. 0
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