G61Mpv, Signaturestatt And Single Stage Outdoor Unit - Lennox G61MPV Service Manual

OPERATING
SEQUENCE
System System
Step
Condition
NO CALL FOR DEHUMIDIFICATION
Normal Operation 1
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
Jumpers at indoor unit with a single stage outdoor unit Jumpers at indoor unit with a single stage outdoor unit
With Condensing unit Cut W914 (R to DS) 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
Dave Lennox SignatureStat to use for this application − 51M26 1 heat / 1 cool or 51M28 − 2 heat / 2 cool for heat pumps
*Dehumidification blower speed is 70% of COOL speed.
**In Precision mode, SignatureStats built before 10−2003 will maintain room temperature up to 3°F(1.8°C) cooler than room
setting. SignatureStats built 10−2003 and later will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.

G61MPV, SignatureStatt and SINGLE STAGE OUTDOOR UNIT

SYSTEM DEMAND
Thermostat Demand
W
Y1 O G
1
On On On
On On On
On On On
On On On
On On On
On On On
TABLE 23
Relative Humidity
Compres Compres-
Status D
24
Acceptable High
VAC
24
Acceptable High
VAC
0
Demand High
VAC
24
Acceptable High
VAC
0
Demand High
VAC
0
Demand High
VAC
Page 37
SYSTEM RESPONSE
Blower Blower
CFM
sor
(COOL)
Compressor and indoor
100% blower follow thermostat
demand
100%
SignatureStat energizes
Y1 and de−energizes D on Y1 and de−energizes D on
a call for de−humidification
70%*
100%
Dehumidification mode
begins when humidity is begins when humidity is
greater than set point
70%*
SignatureStat will try to
70%*
maintain room humidity
setpoint by allowing the setpoint by allowing the
room space to maintain a
room space to maintain a
cooler room thermostat
setpoint** t i t**
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