User`s manual

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Table 23 — EconoMi$er Economizer Service Analysis
LEGEND
PROBLEM CAUSE REMEDY
Damper does not
open.
Indoor (Evaporator) Fan is
Off.
Check to ensure that 24 vac is present at Terminal C1 (Common Power)
on the IFC (Indoor [Evaporator] Fan contactor) or that 24 vac is present at
the IFO (Indoor [Evaporator] Fan On) terminal. Check whether 24 vac is
present at PL (Plug) 6-1 (red wire) and/or PL6-3 (black wire). If 24 vac is
not present, check wiring (see unit label diagram).
Check proper thermostat connection to G on the connection board.
No power to EconoMi$er
controller.
Check to ensure that 24 vac is present across Terminals 24 VAC and
24V COM on the EconoMi$er control. If 24 vac is not present, check
wiring (see unit label diagram). If 24 vac is present, STATUS light should
be on constantly.
No power to G Terminal. If IFM is on, check to ensure 24 vac is present on G Terminal of the
EconoMi$er controller. If 24 vac is not present, check wiring (see unit
label diagram).
Controller fault. If STATUS light is flashing on flash, the EconoMi$er controller is
experiencing a fault condition. Cycle power to the controller. If condition
continues, replace the EconoMi$er controller.
Thermostat fault. If STATUS light is flashing two flashes, the EconoMi$er controller senses
the thermostat is wired incorrectly. Check wiring between the thermostat
and the connection board in the electrical panel. The fault condition is
caused by Y2 being energized before Y1.
Actuator Fault. Check the wiring between the EconoMi$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.)
EconoMi$er
operation limited
to minimum
position.
Minimum position set
incorrectly.
Verify that the MIN POS (%) is set greater than zero. Adjust
MIN POS (%) to 100% to verify operation, and then set to correct setting.
EconoMi$er changeover
set point set too high or
too low.
Set at correct value. See Table 4.
Supply air temperature
sensor faulty.
If STATUS light is flashing four flashes, the supply air temperature
sensor is faulty. Check wiring or replace sensor.
OAT sensor faulty. If STATUS light is flashing five flashes, the OAT sensor is faulty. Check
wiring or replace sensor.
Damper position
less than minimum
position set point.
Supply air low limit
strategy controlling.
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$er is operating correctly.
Damper does not
return to minimum
position.
CO
2
ventilation strategy
controlling.
If a CO
2
sensor is being used, and the damper position is greater than
minimum position, the ventilation control strategy is controlling. Refer to
the Start-Up instructions. EconoMi$er is operating correctly.
Damper does not
close on power
loss
Damper travel is
restricted.
Check to ensure the damper is not blocked.
IFM —
Indoor (Evaporator) Fan Motor
OAT —
Outdoor-Air Temperature