Trane RT-SVX19A-E4 Installation Operation & Maintenance page 46

46
Operation
Unoccupied mode:
If the thermostat being used is
programmable, it will have its own
strategy for unoccupied mode and
will control the unit directly. If a
mechanical thermostat is being
used, a field applied time clock with
relay contacts connected to J6-11
and J6-12 can initiate an
unoccupied mode as follows:
• Contacts open: Normal occupied
operation.
• Contacts closed: Unoccupied
operation as follows - Fan in
auto mode regardless of fan
switch position. Economizer
closes except while economizing
regardless of minimum position
setting.
Table 34 - Cooling/Economizer Operation with Thermostat1,2
OK to Thermostat
Economize? Y1
No On
No Off
No On
Yes On
Yes Off
Yes On
Cooling/Economizer Operation:
If unit does not have an economizer,
the Cool/Econ Stage 1 and Stage 2
will call directly for mechanical
cooling (compressor) stages. If the
unit has an economizer, the
Cool/Econ stages will function as
follows.
Thermostat Call for Economizer
Y2 Cooling
Off Inactive
On Inactive
On Inactive
Off Active
On Active
On Active
Compressor Staging
Request
Compressor Output 1
Compressor Output 2
Compressor
Outputs 1 & 2
Off
Compressor off
Compessor
RT-SVX19A-E4