Carrier 50HJQ016 Installation, Start-Up And Service Instructions Manual page 23

EconoMi$er Adjustment
LED INDICATION — The EconoMi$er controller features
an onboard diagnostic LED (light-emitting diode) that flashes
to indicate its status. See Table 12 for flash codes. The control-
ler also has terminal connections (LED) for remotely mounting
an LED, if desired. The flash code priorities are as follows:
1. On/Off or continuous flash
2. Critical fault
3. Non-critical fault
If any sensors are opened, shorted, or removed, the
EconoMi$er determines whether the failure is critical or non-
critical and flashes the appropriate code. If a non-critical sensor
fault occurs (i.e., outdoor air humidity), the EconoMi$er auto-
matically reconfigures its control strategy to a more appropriate
mode. If a critical sensor fault occurs (i.e., discharge air ther-
mistor), the EconoMi$er reverts to a safe mode of operation
until the sensor problem is resolved.
MANUAL CONFIGURATION PUSHBUTTON — The
EconoMi$er controller also features an onboard button (CON-
FIG) to help troubleshoot the system. See Fig. 17. The button
can perform 3 different functions.
Pressing the CONFIG button for more than three seconds,
but less than ten seconds and then releasing will start the auto-
matic test procedure. The damper will modulate fully open,
wait, and modulate closed. This process takes three minutes to
complete. Use this feature to determine if the actuator can be
commanded.
If the CONFIG button is pressed and held for ten seconds
and less than 30 seconds then released, the EconoMi$er con-
troller reconfigures its mode of operation based on the sensors
that are connected and functioning normally, and cancels the
automatic test procedure.
If the EconoMi$er controller recognized a non-critical
sensor fault, and flashed a code (i.e., FLASH 6, outdoor air
humidity sensor fault) the FLASH CODE will be cleared, and
normal operation begins. Ensure faulty sensor is removed
before clearing faults.
If the EconoMi$er controller recognizes a critical sensor
fault, and flashes a code (i.e., FLASH 4, discharge air thermo-
stat fault) the FLASH code will not be cleared, and the
EconoMi$er will remain in the safe operation mode. The
sensor fault must be corrected to enable EconoMi$er to revert
to normal operation.
Table 12 — EconoMi$er Control Module Flash Code Identification
FLASH CODE
Constant On Normal operation
Constant Off No power
Continuous CONFIG button pushed and held
Flash between 3 and 9 seconds
Flash One Control board fault
Flash Two Thermostat fault (i.e., Y2 without Y1)
Flash Three Actuator fault
Flash Four Discharge air thermistor fault
Flash Five Outdoor air temperature sensor fault
Flash Six Outdoor air humidity sensor fault
Flash Seven Return air temperature sensor fault
Flash Eight Return air humidity sensor fault
Flash Nine Carbon Dioxide (CO
Flash Ten Onboard adjustment potentiometer fault
CAUSE
) sensor fault
2
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If the CONFIG button is pressed and held for more than
30 seconds and released, the EconoMi$er controller will enable
the enthalpy comparison strategy (with outdoor air enthalpy
and return air enthalpy sensors installed).
Power Failure —
Dampers have a spring return. In event
of power failure, dampers will return to fully closed position
until power is restored. Do not manually operate damper
motor.
Refrigerant Charge —
is listed on unit nameplate and in Table 1. Refer to Carrier
GTAC II; Module 5; Charging, Recovery, Recycling, and Rec-
lamation section for charging methods and procedures.
Unit panels must be in place when unit is operating during
charging procedure.
NO CHARGE — Use standard evacuating techniques. After
evacuating system, weigh in the specified amount of refriger-
ant (refer to Table 1).
LOW CHARGE COOLING — Using appropriate cooling
charging chart (see Fig. 37 and 38), add refrigerant until condi-
tions of the chart are met. Note that charging charts are differ-
ent from those normally used. Charts are based on charging
units to correct superheat for various operating conditions. An
accurate pressure gage and temperature sensing device are re-
quired. Connect temperature sensing device to service port on
suction line and insulate it so that outdoor ambient temperature
does not affect reading. Indoor-air cfm must be within normal
operating range of unit.
TO USE COOLING CHARGING CHART — Take outdoor
ambient temperature and read the suction pressure gage. Refer
to appropriate chart to determine correct suction temperature. If
suction temperature is high, add refrigerant. If suction tempera-
ture is low, carefully recover some of the charge. Recheck suc-
tion pressure as charge is adjusted.
Example (Fig. 38)
Outdoor Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85 F
Suction Pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 psig
Suction Temperature Should be . . . . . . . . . . . . . . . . . . . . . .60 F
(Suction Temperature may vary ± 5 F.)
LOW CHARGE, HEATING — If outdoor ambient tempera-
ture is above 40 F, operate unit on cooling and refer to Low
Charge, cooling section above. If outdoor ambient is below
40 F, evacuate system and weigh in specified amount of refrig-
erant. (Refer to Table 1.)
ACTION TAKEN BY ECONOMI$ER
Normal operation.
No operation.
Outdoor air damper is stroked fully open, then closed
(automatic test procedure takes 3 minutes to complete).
System shutdown.
System shutdown until corrected.
Revert to mechanical cooling only.
Continue operation with damper at minimum position.
Revert to mechanical cooling only.
Continue operation with damper at minimum position.
Disable mechanical cooling lockout.
Continue operation with dry bulb or dry bulb differential switchover.
Continue operation with single enthalpy EconoMi$er
switchover or dry bulb EconoMi$er switchover (without
humidity sensor).
Continue operation with single enthalpy, differential dry
bulb, or dry bulb EconoMi$er switchover.
Continue operation without ventilation control.
Continue operation with default potentiometer settings.
Amount of refrigerant charge