Economizer Troubleshooting - Carrier 48TF004-007 Installation, Start-Up And Service Instructions Manual

PROBLEM
Damper does not open. Indoor (evaporator) fan is Off.
No power to EconoMi$er
controller.
No power to G terminal.
Controller fault.
Thermostat fault.
Actuator fault.
EconoMi$er operation Minimum position set incorrectly. Verify that the MIN POS (%) is set greater than zero. Adjust MIN POS (%) to
limited to minimum
position.
EconoMi$er changeover set-
point set too high or too low.
Supply-Air Temperature Sensor
faulty.
OAT Sensor faulty
Damper position less Supply-Air Low Limit Strategy
than minimum position controlling.
set point.
CO
Damper does not return
controlling
to minimum position.
Damper does not close Damper travel is restricted.
on power loss.
LEGEND
OAT — Outdoor-Air Temperature
Table 36 — EconoMi$er Troubleshooting
CAUSE
Ventilation Strategy
2
Check to ensure that 24 vac is present at terminal C1 (Common Power) on the
IFC (Indoor Evaporator Fan Contactor) or that 24 vac is present at the IFO
(Indoor Evaporator Fan On) terminal. Check whether 24 vac is present at PL
(Plug) 6-1 (red wire) and/or PL6-3 (black wire). If 24 vac is not present, check
wiring (see unit label diagram).
Check proper thermostat connection to G on the connection board.
Check to ensure that 24 vac is present across Terminals 24 VAC and 24V COM
on the EconoMi$er control. If 24 vac is not present, check wiring (see unit label
diagram). If 24 vac is present, STATUS light should be on constantly.
If IFM is on, check to ensure 24 vac is present on G terminal of the EconoMi$er
controller. If 24 vac is not present, check wiring (see unit label diagram).
If STATUS light is flashing one flash, the EconoMi$er controller is experiencing a
fault condition. Cycle power to the controller. If condition continues, replace the
EconoMi$er controller.
If STATUS light is flashing two flashes, the EconoMi$er controller senses the
thermostat is wired incorrectly. Check wiring between the thermostat and the
connection board in the electrical panel. The fault condition is caused by Y2
being energized before Y1.
Check the wiring between the EconoMi$er controller and the actuator.
Hold CONFIG button between three and ten seconds to verify the actuator's
operation. (This process takes three minutes to complete.)
100% to verify operation, and then set to correct setting.
Set at correct value. See Table 3.
If STATUS light is flashing four flashes, the Supply-Air Temperature Sensor is
faulty. Check wiring or replace sensor.
If STATUS light is flashing five flashes, the OAT sensor is faulty. Check wiring or
replace sensor.
The supply-air temperature is less than 45 F, causing the minimum position to
decrease. Refer to the Start-Up instructions. Verify correct setting of MIN POS
(%). If correct, EconoMi$er is operating correctly.
If CO sensor is being used, and the damper position is greater than minimum
2
position, the ventilation control strategy is controlling. Refer to the Start-Up
instructions. EconoMi$er is operating correctly.
Check to ensure the damper is not blocked.
47
REMEDY