Honeywell PRESTIGE THX9321 System Installation Manual page 18

System Installation Guide
Economizer and TOD operation (ISU 2220)
Commercial use only
The Economizer can greatly reduce energy costs if configured properly. In some
climates the cooling system may run hundreds of hours, when it may not be
required to maintain indoor comfort. In some conditions, ventilation with outdoor
air can achieve the same level of comfort at lower cost. Tables below explain how
the Economizer feature maintains comfort while minimizing costs.
Thermostat Mode
Occupied
Occupied temporarily
Occupied
Occupied temporarily
Pre-occupancy purge
Unoccupied
Unoccupied temporarily
Standby
Unoccupied
Unoccupied temporarily
Standby
Non-programmable
Non-programmable
Occupied
Occupied temporarily
Temperature overrides
Unoccupied
Unoccupied temporarily
Standby
Non-programmable
69-2490—03
69-2490_B.indd 18
Equipment Operation
Heat/Cool/Fan running
Heat/Cool/Fan running
Heat/Cool/Fan NOT running
Heat/Cool/Fan NOT running
Fan running
Cooling system running
Cooling system running
Cooling system running
Cooling system NOT running
Cooling system NOT running
Cooling system NOT running
Fan running
Fan NOT running
Thermostat Mode
18
A-L/A terminal:
Economizer
ON
OFF
ON
OFF
A-L/A terminal:
TOD
ON
OFF
7/13/2011 1:42:00 PM