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TABLE 11
OPERATING SEQUENCE
SL280V, Non-Communicating Thermostat with Humidity Control Feature and Two-Speed Outdoor Unit
OPERATING
SEQUENCE
SYSTEM DEMAND
SYSTEM RESPONSE
System
Condition
Step
Thermostat Demand
Relative Humidity
Compre
ssor
Blower
CFM
(cool)
Comments
Y1
Y2
O
G
W1
W2
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%*
CS7500 thermostat
energizes Y1 and de-
energizes 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 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%**
CS7500 thermostat
will try to maintain
room humidity setpoint
by allowing the room
space to maintain a
cooler room thermostat
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%
CS7500 thermostat
energizes Y2 and de-
energizes 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%** CS7500 thermostat
will try to maintain
room humidity setpoint
by allowing the room
space to maintain a
cooler room thermostat
setpoint***
Jumpers at indoor unit with a two stage outdoor unit
Cut factory jumper from Y1 to Y2 or cut W915 (Y1 to Y2)
With Condensing unit - Cut W914 (R to DS) on SureLight® control
With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight® control
CS7500 thermostat to use for this application - Y2081 4 heat / 2 cool
*Normal operation first stage cooling blower speed is 70% COOL speed.
**Dehumidification blower speed is, reduced to 70% of COOL.
***In Precision mode, CS7500 thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.
