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Operating Sequence
System
Step
Condition
NO CALL FOR DEHUMIDIFICATION
Normal Operation
1
- Y1
Normal Operation
2
- Y2
ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING
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
ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING
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 two stage outdoor unit
• Cut factory link from Y1 to Y2 or cut W915 (Y1 to Y2) on integrated control
• 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
507029-05
System Demand
Thermostat Demand
1st
2nd
O
G
Stage
Stage
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 25. Cooling Operating Sequence
A97DSMV and Two Stage Outdoor Unit
Relative Humidity
Compressor
Status
D
24
Acceptable
VAC
24
Acceptable
High
VAC
24
Acceptable
VAC
0
Demand
High
VAC
24
Acceptable
VAC
0
Demand
High
VAC
0
Demand
High
VAC
24
Acceptable
High
VAC
0
Demand
High
VAC
24
Acceptable
VAC
0
Demand
High
VAC
0
Demand
High
VAC
Issue 2241
System Response
Blower
CFM
(COOL)
Low
70%
Compressor and indoor
blower follow thermostat
demand
100%
Thermostat energizes
Low
70%
2nd Stage and de-
energizes D on a call for
70%
de-humidification
Dehumidification mode
Low
70%
begins when humidity is
greater than set point.
Maximum overcool from
70%
cooling setpoint is 2°F.
Thermostat will keep
outdoor unit energized
after cooling temperature
setpoint has been
70%
reached in order to
maintain room humidity
setpoint. Maximum
overcool from cooling
setpoint is 2°F.
Thermostat energizes
100%
2nd Stage and de-
energizes D on a call for
70%
de-humidification
Dehumidification mode
Low
70%
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.
Comments
Page 49 of 73
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