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TABLE 3. CBA25UHV Thermostat and Single-Stage Outdoor Unit Operating Sequence
Operating Sequence System Demand System Response
System
Condition
Step
Thermostat Demand Relative Humidity
pressor
Air
Handler
CFM
(COOL)
Comments
Y1 Y2 O G W1 W2 Status D
NO CALL FOR DEHUMIDIFICATION
Normal Operation 1 On On On Acceptable 24 VAC High 100%
low thermostat demand
BASIC MODE (only active on a Y1 thermostat demand)
Normal
Operation
1 On On On Acceptable 24 VAC High 100%
gizes 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%
midity 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%*
midity setpoint by allowing the room
mostat 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 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.
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