Allied A80US2V - Page 18

508155-01Issue 2108Page 18 of 49
Operating Sequence System Demand System Response
System
Condition
Step
Thermostat Demand Relative Humidity
Compressor
Blower
CFM
(COOL)
Comments
Y1 Y2 A G W1 W2 Status D
NO CALL FOR DEHUMIDIFICATION
Normal Operation
- Y1
1 On On On Acceptable
24
VAC
Low 70%*
Compressor and indoor
blower follow thermostat
demand
Normal Operation
- Y2
2 On On On On Acceptable
24
VAC
High 100%
ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING
BASIC MODE (only active on a Y1 thermostat demand)
Normal Operation 1 On On On Acceptable
24
VAC
Low 70%*
Thermostat energizes Y2
and de-energizes D on a
call for de-humidication
Dehumidication
Call
2 On 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
Low 70%*
Dehumidication mode
begins when humidity is
greater than set point
Dehumidication
Call
2 On On On On Demand
0
VAC
High 70%**
Dehumidication
Call ONLY
1 On On On On Demand
0
VAC
High 70%**
Thermostat will try to
maintain room humidity
setpoint by allowing the
room space to maintain
a cooler room thermostat
setpoint***
ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING
BASIC MODE (only active on a Y1 thermostat demand)
Normal Operation 1 On On On On Acceptable
24
VAC
High 100%
Thermostat energizes Y2
and de-energizes D on a
call for de-humidication
Dehumidication
Call
2 On 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
Low 70%*
Dehumidication mode
begins when humidity is
greater than set point
Dehumidication
Call
2 On On On On Demand
0
VAC
High 70%**
Dehumidication
Call ONLY
1 On On On On Demand
0
VAC
High 70%**
Thermostat 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
• Cut factory jumper from Y1 to Y2 or cut W915 (Y1 to Y2)
• With Condensing unit - Cut W914 (R to OS) on control
• With Heat Pump - Cut W914 (R to DS) and W951 (R to O) on control
*Normal operation rst stage cooling blower speed is 70% COOL speed.
**Dehumidication blower speed is reduced to 70% of COOL.
Table 12. A80US2V, Non-Communicating Thermostat with Humidity Control Feature and Two-Speed Outdoor
Unit