507746-01
Issue 1821
Page 27 of 39
Unit Operating Sequences
This section details unit operating sequence for non-communicating systems.
NOTE:
For communicating systems, see the Comfort Sync thermostat installation instruction.
Table 14. BCE7S with Non-Communicating Thermostat and Single-Stage Outdoor Unit
Operating Sequence
Operating Sequence
System Demand
System Response
System
Condition
Step
Thermostat Demand
Relative Humidity
Comp
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%
Compressor and indoor air handler
follow thermostat demand.
BASIC MODE (only active on a Y1 thermostat demand)
Normal Operation
1
On
On
On
Acceptable 24 VAC
High
100%
Thermostat energizes Y1 and de-
energizes D on a dehumidification
demand. NOTE - No over cooling.
Dehumidification
demand
2
On
On
On
Demand
0 VAC
High
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 setpoint.
Dehumidification
demand
2
On
On
On
Demand
0 VAC
High
70%
Dehumidification
demand ONLY
1
On
On
On
Demand
0 VAC
High
70%
Thermostat will keep outdoor unit
energized after cooling temperature
has been reached in order to
maintain room humidity setpoint.
NOTE - Allow to cool 2°F beyond
cooling setpoint.
