Page 54
TABLE 30
OPERATING SEQUENCE
G61MPV, SignatureStattThermostat and Two−Stage Outdoor Unit
OPERATING
SEQUENCE
SYSTEM DEMAND SYSTEM RESPONSE
System
Condition
Step
Thermostat Demand Relative Humidity
Compressor
Blower
CFM
(COOL)
Comments
Y1 Y2 O G
W
1
W
2
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%
SignatureStatt thermostat
energizes Y2 and de−ener-
gizes D on a call for de−hu-
midification
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 be-
gins 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%
SignatureStatt thermostat
will keep outdoor unit en-
ergized after cooling tem-
perature setpoint has been
reached in order to main-
tain room humidity set-
point.*
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%
SignatureStatt thermostat
energizes Y2 and de−ener-
gizes D on a call for de−hu-
midification
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 be-
gins 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%
SignatureStatt thermostat
will keep outdoor unit en-
ergized after cooling tem-
perature setpoint has been
reached in order to main-
tain room humidity set-
point.*
Jumpers at indoor unit with a two stage outdoor unit
Cut factory jumper from Y1 to Y2 or cut W915 (Y1 to Y2) on SureLight
®
board
With Condensing unit − Cut W914 (R to DS) on SureLight
®
board
With Heat Pump − Cut W914 (R to DS) & W951 (R to O) on SureLight
®
board
*In Precision mode, SignatureStatt thermostat will allow room temperature up to 2 °F (1.2°C) cooler than room setting.
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