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Model
All Models
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
Page 48 of 74
-15%
-7.5%
Allowed
Allowed
Table 19. Allowable Heating Speeds
Model
All Models
Table 20. Allowable Circulation Speeds
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 21. Cooling Operating Sequence
A98USMV and Single Stage Outdoor Unit
Default
Factory Setting
38% of Second Stage Cooling
Allowed
Compressor
D
24 VAC
High
24 VAC
High
0 VAC
High
24 VAC
High
0 VAC
High
0 VAC
High
Issue 2346
+7.5%
+15%
Allowed
Allowed
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.
508364-01
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