Operation – Trane RT-SVX19A-E4 User Manual
Page 46
Operation
RT-SVX19A-E4
46
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.
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.
Table 34 - Cooling/Economizer Operation with Thermostat1,2
OK to
Economize?
Thermostat
Y1
Thermostat
Y2
Call for Economizer
Cooling
Compressor Staging
Request
No
On
Off
Inactive
Compressor Output 1
No
Off
On
Inactive
Compressor Output 2
No
On
On
Inactive
Compressor
Outputs 1 & 2
Yes
On
Off
Active
Off
Yes
Off
On
Active
Compressor off
Yes
On
On
Active
Compessor