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Operating
Sequence
System
Y1
Condition
Step
NO CALL FOR DEHUMIDIFICATION
Normal
1
On
Operation − Y1
Normal
2
On
Operation − Y2
ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING
Normal
1
On
Operation
Dehumidificatio
2
On
n Call
Normal
1
On
Operation
Dehumidificatio
2
On
n call
Dehumidificatio
1
On
n call ONLY
ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING
Normal
1
On
Operation
Dehumidificatio
2
On
n Call
Normal
1
On
Operation
Dehumidificatio
2
On
n call
Dehumidificatio
1
On
n call ONLY
Jumpers at indoor unit with a two stage outdoor unit
With Condensing unit − R to O
With Heat Pump − none
Lennox SignatureStatt used for these applications are 51M27 − 2 heat / 2 cool or 51M28 − 2 heat / 2 cool heat pump.
*
During dehumidification, cooling air handler speed is as follows: 65% of COOL cfm for −41units, 60% COOL cfm for −51 and −61 units
** In Precision mode, SignatureStatt thermostat built BEFORE October 2003 will maintain the room temperature up to 3°F (1.8°C) cooler than room
thermostat setting. Precision thermostat built AFTER October 2003 will maintain the room temperature up to 2°F (1.2°C) cooler than the room ther-
mostat setting.
Table 8. CB31MV, SignatureStatt and Two−Stage Outdoor Unit
System Demand
Thermostat Demand
Y2
O
G
W1
W2
On
On
On
On
On
BASIC MODE (only active on a Y1 thermostat demand)
On
On
On
On
On
PRECISION MODE (operates independent of a Y1 thermostat demand)
On
On
On
On
On
On
On
On
BASIC MODE (only active on a Y1 thermostat demand)
On
On
On
On
On
On
PRECISION MODE (operates independent of a Y1 thermostat demand)
On
On
On
On
On
On
On
On
On
Relative Humidity
Status
D
Compressor
Acceptable
24 VAC
Acceptable
24 VAC
Acceptable
24 VAC
Demand
24 VAC
Acceptable
24 VAC
Demand
0 VAC
Demand
0 VAC
Acceptable
24 VAC
Demand
0 VAC
Acceptable
24 VAC
Demand
0 VAC
Demand
0 VAC
Page 13
System Response
Air Handler
CFM
(COOL)
Compressor and in-
Low
70%
door air handler fol-
low thermostat de-
High
100%
mand
SignatureStat ener-
Low
70%
gizes Y2 and de−en-
ergizes D on a call
High
60%/65%*
for dehumidification
Dehumidification
Low
70%
mode begins when
humidity is greater
High
60%/65%*
than set point
**SignatureStatt
will try to maintain
room humidity set-
point by allowing the
High
60%/65%*
room space to
maintain a cooler
room thermostat
setpoint
SignatureStat ener-
High
100%
gizes Y2 and de−en-
ergizes D on a call
High
60%/65%*
for dehumidification
Dehumidification
High
100%
mode begins when
humidity is greater
High
60%/65%*
than set point
**SignatureStatt
High
60%/65%*
will try to maintain
room humidity set-
point by allowing the
room space to
maintain a cooler
room thermostat
setpoint
Comments
CB31MV SERIES
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