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Operation
RT-SVX19A-E446
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
Ye s On Off Active Off
Ye s Off On Active Compressor off
Ye s On On Active Compessor