Page 47
TABLE 23
COOLING OPERATING SEQUENCE
SLP98UHV and Two−Stage Outdoor Unit
OPERATING
SEQUENCE
SYSTEM DEMAND
SYSTEM RESPONSE
System
Condition
Step
Demand
Relative Humidity
Compressor
Blower
CFM
(COOL)
Comments
1st
stage
2nd
stage
O
G
Status
D*
NO CALL FOR DEHUMIDIFICATION
Normal Operation −
Y1
1
On
On
On
Acceptable
24
VAC
Low
70%
Compressor and indoor
blower follow thermostat
demand
Normal Operation −
Y2
2
On
On
On
On
Acceptable
24
VAC
High
100%
ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING
BASIC MODE (only active on a Y1 thermostat demand)
Normal Operation
1
On
On
On
Acceptable
24
VAC
Low
70%
Thermostat energizes
2nd stage and de−ener-
gizes D on a call for de−
humidification
Dehumidification
Call
2
On
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
Low
70%
Dehumidification mode
begins when humidity is
greater than set point
Dehumidification
call
2
On
On
On
On
Demand
0
VAC
High
70%
Dehumidification
call ONLY
1
On
On
On
On
Demand
0
VAC
High
70%
Thermostat will keep out-
door unit energized after
cooling temperature set-
point has been reached
in order to maintain room
humidity setpoint.*
ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING
BASIC MODE (only active on a Y1 thermostat demand)
Normal Operation
1
On
On
On
On
Acceptable
24
VAC
High
100%
Thermostat energizes
2nd stage and de−ener-
gizes D on a call for de−
humidification
Dehumidification
Call
2
On
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
Low
70%
Dehumidification mode
begins when humidity is
greater than set point
Dehumidification
call
2
On
On
On
On
Demand
0
VAC
High
70%
Dehumidification
call ONLY
1
On
On
On
On
Demand
0
VAC
High
70%
Thermostat will keep out-
door unit energized after
cooling temperature set-
point has been reached
in order to maintain room
humidity setpoint.
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 SureLight
®
inte-
grated control.
With Condensing unit − Cut W914 (R to DS) on SureLight
®
integrated control;
With Heat Pump − Cut W914 (R to DS) & W951 (R to O) on SureLight
®
integrated control.
*ComfortSense
®
7000 thermostat only
