Carrier 50TCA04-A07 - Manual (Page 42)

42
Use the Carrier network communication software to start
up and configure the PremierLink controller.
Changes can be made using the ComfortWORKSr
software, ComfortVIEWt software, Network Service
Tool, System Pilott device, or Touch Pilott device. The
System Pilot and Touch Pilot are portable interface
devices that allow the user to change system set--up and
setpoints from a zone sensor or terminal control module.
During start--up, the Carrier software can also be used to
verify communication with Premier--Link controller.
NOTE: All set--up and setpoint configurations are factory
set and field--adjustable.
For specific operating instructions, refer to the literature
provided with user interface software.
Perform System Check--Out
1. Check correctness and tightness of all power and
communication connections.
2. At the unit, check fan and system controls for proper
operation.
3. At the unit, check electrical system and connections
of any accessory electric heater.
4. Check to be sure the area around the unit is clear of
construction dirt and debris.
5. Check that final filters are installed in the unit. Dust
and debris can adversely affect system operation.
6. Verify that the PremierLink controls are properly con-
nected to the CCN bus.
Initial Operation and Test
Perform the following procedure:
1. Apply 24 vac power to the control.
2. Connect the service tool to the phone jack service
port of the controller.
3. Using the Service Tool, upload the controller from
address 0, 31 at 9600 baud rate. The address may be
set at this time. Make sure that Service Tool is con-
nected to only one unit when changing the address.
Memory Reset
DIP switch 4 causes an E--squared memory reset to
factory defaults after the switch has been moved from
position 0 to position 1 and the power has been restored.
To enable the feature again, the switch must be put back
to the 0 position and power must be restored; this prevents
subsequent resets to factory defaults if the switch is left at
position 1.
To cause a reset of the non--volatile memory (to factory
defaults), turn the controller power off if it is on, move the
switch from position 1 to position 0, and then apply power
to the controller for a minimum of 5 seconds. At this
point, no action occurs, but the controller is now ready for
the memory to reset. Remove power to the controller
again and move the switch from position 0 to position 1.
This time, when power is applied, the memory will reset
to factory defaults. The controller address will return to
bus 0 element 31, indicating that memory reset occurred.
Refer to Installation Instruction 33CS--58SI for full
discussion on configuring the PremierLink control system.
Operating Sequence, Base Unit Controls
COOLING, UNITS WITHOUT ECONOMIZER — When
thermostat calls for cooling, terminals G and Y1 are
energized. The indoor--fan contactor (IFC) and
compressor contactor are energized and indoor--fan motor,
compressor, and outdoor fan starts. The outdoor fan motor
runs continuously while unit is cooling.
HEATING, UNITS WITHOUT ECONOMIZER — When
the thermostat calls for heating, terminal W1 will be
energized with 24v. The IFC and heater contactor no. 1
(HC1) are energized.
COOLING, UNITS WITH ECONOMI$ER IV — When
free cooling is not available, the compressors will be
controlled by the zone thermostat. When free cooling is
available, the outdoor--air damper is modulated by the
EconoMi$er IV control to provide a 50 to 55_F supply--air
temperature into the zone. As the supply--air temperature
fluctuates above 55 or below 50_F, the dampers will be
modulated (open or close) to bring the supply-- air
temperature back within the setpoint limits.
Integrated EconoMi$er IV operation on single stage units
requires a 2--stage thermostat (Y1 and Y2).
For EconoMi$er IV operation, there must be a thermostat
call for the fan (G). This will move the damper to its
minimum position during the occupied mode.
If the increase in cooling capacity causes the supply--air
temperature to drop below 45_F, then the outdoor--air
damper position will be fully closed. If the supply--air
temperature continues to fall, the outdoor--air damper will
close. Control returns to normal once the supply--air
temperature rises above 48_F. If optional power exhaust is
installed, as the outdoor--air damper opens and closes, the
power exhaust fans will be energized and deenergized.
If field--installed accessory CO2 sensors are connected to
the EconoMi$er IV control, a demand controlled
ventilation strategy will begin to operate. As the CO2
level in the zone increases above the CO2 setpoint, the
minimum position of the damper will be increased
proportionally. As the CO2 level decreases because of the
increase in fresh air, the outdoor--air damper will be
proportionally closed. Damper position will follow the
higher demand condition from DCV mode or free cooling
mode.
Damper movement from full closed to full open (or vice
versa) will take between 1--1/2 and 2--1/2 minutes.
If free cooling can be used as determined from the
appropriate changeover command (switch, dry bulb,
enthalpy curve, differential dry bulb, or differential
enthalpy), a call for cooling (Y1 closes at the thermostat)
will cause the control to modulate the dampers open to
maintain the supply air temperature setpoint at 50 to 55_F.
As the supply--air temperature drops below the setpoint
range of 50 to 55_F, the control will modulate the
50TC