Page 26
Change
over setpoint
Thermostat
Demand
Blower CFM
(COOL)
Relative Humidity
(Efficiency
Plus
Lights)
Comments
Note−When changing unit mode of operation from cooling to heating, indicating lights that are on will stay on until the first thermostat heating
demand.
SYSTEM DEMAND
SYSTEM RESPONSE
Y1
Acceptable (None)
Y1
COOL
Dehumidification mode begins
when relative humidity is
greater than setpoint.
Y1
Y1
Over Setpoint
Change to
Acceptable (None)
COOL
None
Over setpoint
Off
Y1
Over setpoint
None
Over setpoint
(1 or more)
Change to
Acceptable (None)
Y1
Off
While unit is not operating (no thermo-
stat demand) slide switch is moved
down and back up. Blower operates at
COOL CFM.
When humidity demand is satisfied,
blower immediately shifts to the
COOL CFM in order to hasten the end
of the cycle.
TABLE 11
TYPICAL CBX32MV, CCB1 and SINGLE SPEED OUTDOOR UNIT OPERATING SEQUENCE
Step
OPERATING SEQUENCE
System
Condition
1
2
1
2
1
2
1
2
Call for humidity re-
moval during call
for cooling.
Humidity demand
satisfied during ther-
mostat demand.
Normal operation
*Call for cooling
after call for
humidity removal.
Humidity demand sat-
isfied between thermo-
stat demands (unit off
cycle).
1
Y1
Acceptable (None)
Compressor demand and indoor blower
speed follow thermostat demand.
* Reduced blower speed is 70% of COOL for 018/024 and 024/030, 65% of COOL for the −036 units; 60% of COOL for −048 and −060 series units.
COOL
*60%/65%/70%
of COOL
COOL
*60%/65%/70%
of COOL
*60%/65%/70%
of COOL
Dehumidification mode begins
when relative humidity is
greater than setpoint.
TABLE 12
CBX32MV, SignatureStat or ComfortSense 7000 and SINGLE STAGE OUTDOOR UNIT
OPERATING
SEQUENCE
SYSTEM DEMAND
SYSTEM RESPONSE
System
Condition
Step
Thermostat Demand
Relative Humidity
Compres-
sor
Blower
CFM
(COOL)
Comments
Y1
O
G
W
1
Status
D
NO CALL FOR DEHUMIDIFICATION
Normal Operation
1
On
On
On
Acceptable
24
VAC
High
100%
Compressor and indoor
blower follow thermostat
demand
BASIC MODE (only active on a Y1 thermostat demand)
Normal Operation
1
On
On
On
Acceptable
24
VAC
High
100%
SignatureStat energizes
Y1 and de−energizes D on
a call for dehumidification
Dehumidification
Call
2
On
On
On
Demand
0
VAC
High
60%/65
70%*
PRECISION MODE (operates independent of a Y1 thermostat demand)
Normal Operation
1
On
On
On
Acceptable
24
VAC
High
100%
Dehumidification mode
begins when humidity is
greater than set point
Dehumidification
call
2
On
On
On
Demand
0
VAC
High
60%/65%
70%*
Dehumidification
call ONLY
1
On
On
On
Demand
0
VAC
High
60%/65%
70%*
SignatureStat 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 single stage outdoor unit
With Condensing unit − Y1 to Y2 and R to O
With Heat Pump − Y1 to Y2
*During dehumidification, cooling blower speed is as follows: 70% of COOL cfm for 018/024, 024/030 & 068 65% for 036,
60% for 048 & 060 units.
** In Precision mode, Signature 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 thermostat setting.
