Trane ReliaTel - Page 76

76 RT-SVD03G-EN
Operation with a Conventional Thermostat (Constant Volume)
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 25. Cooling/Economizer Operation with Thermostat
OK to
Economize?
Thermostat
Y1
Call for
Thermostat
Y2
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 Off
Yes On On Active
Compressor
Output 1
40 to 50 ton CV only.
This unit has 3 stages of cooling if using a zone sensor or binary inputs as shown above.
If using a conventional thermostat it has 2 stages as follow:
Y1 = 1st stage
Y1 + Y2 = 3rd stage
VAV
Thermostat inputs are ignored on VAV units.