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TABLE 3. CBA25UHV Thermostat and Single-Stage Outdoor Unit Operating Sequence
Operating Sequence
System
Step
Condition
NO CALL FOR DEHUMIDIFICATION
Normal Operation
1
BASIC MODE (only active on a Y1 thermostat demand)
Normal
1
Operation
Dehumidification Call
2
PRECISION MODE (operates independent of a Y1 thermostat demand)
Normal Operation
1
Dehumidification Call
2
Dehumidification Call
1
ONLY
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 air handler speed is as follows: 70% of COOL cfm for 018, 024, 030; 65% for 036; 60% for 042, 048 and 060 units.
** Thermostat will maintain the room temperature up to 2°F (1.2°C) cooler than the room thermostat setting in precision mode.
System Demand
Thermostat Demand
Y1
Y2
O
G
W1
W2
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
Relative Humidity
pressor
Status
D
Acceptable
24 VAC
High
Acceptable
24 VAC
High
Demand
0 VAC
High
Acceptable
24 VAC
High
Demand
0 VAC
High
Demand
0 VAC
High
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System Response
Air
Handler
Comments
CFM
(COOL)
100%
low thermostat demand
100%
gizes D on a call for dehumidification
60%/65
70%*
100%
60%/65%
midity is greater than set point
70%*
60%/65%
70%*
midity setpoint by allowing the room
mostat setpoint**
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