Allied A80US2VX - Page 19

508033-02 Issue 2135 Page 19 of 48
Operating Sequence System Demand System Response
System Condition Step
Thermostat Demand Relative Humidity
Compressor
Blower
CFM
(cool)
Comments
Y1 Y2 O 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 Y1 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 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 two stage outdoor unit
Cut factory jumper from Y1 to Y2 or cut W915 (Y1 to Y2)
With Condensing unit - Cut W914 (R to DS) on SureLight
®
control
With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight
®
control
*Normal operation rst stage cooling blower speed is 70% COOL speed.
**Dehumidication blower speed is, reduced to 70% of COOL.
***In Precision mode, thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.
Table 13. Operating Sequence
A80US2VX, Non-Communicating Thermostat with Humidity Control Feature and Two-Speed Outdoor Unit