Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Catalog No. 534-80004
Printed in U.S.A.
Form 48/50-56SI
Pg 16
1-01
Replaces: 48/50-49SI
Book 1 1 1 4 4 4
Tab
1a 1b 5a 5a 6a 6b
Copyright 2001 Carrier Corporation
Table 7 — Troubleshooting (cont)
PROBLEM
CAUSE
REMEDY
Damper Position
Limited to
Minimum Position
Minimum Position Set
Incorrectly
Verify MIN POS (%) is set greater than zero. Adjust the 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 3.
Supply Air Temperature
Sensor Faulty
If STATUS light is flashing 4 flashes, the supply air temperature sensor is
faulty. Check the wiring from the sensor to the controller. Using Table 5 verify the
temperature versus resistance of the sensor if accurate at ambient conditions. Set
the multimeter in the resistance mode to 10k ohms. Disconnect the wires from the
sensor, and measure across the 2 terminals. If accurate, reconnect the wires. Dis-
connect the wires from DAT (violet) and COM (pink) at the controller.
Using the same technique, measure the resistance between the wires. The values
should be the same as the original test. If the temperature versus resistance does
not coincide with the appropriate value, replace the sensor. Make sure the violet
and pink wires are connected on both ends, at the sensor and the controller.
Outdoor Air Temperature
Sensor Faulty
If STATUS light is flashing 5 flashes, the outdoor air temperature sensor is
faulty. Check wiring from the sensor to the controller. Using Table 5, verify the tem-
perature versus resistance of the sensor is accurate at ambient conditions. Set the
multimeter in the resistance mode to 10k ohms. Disconnect the wires from the
sensor, and measure across the 2 terminals. If accurate, reconnect the wires. Dis-
connect the wires from OAT (tan) and COM (violet) at the controller.
Using the same technique, measure the resistance between the wires. The values
should be the same as the original test. If the temperature versus resistance does
not coincide with the appropriate value, replace the sensor. Make sure the tan and
violet wires are connected on both ends, at the sensor and the controller.
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 section. Verify correct
setting of the 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$er is operating correctly.
Damper Does Not
Close on Power Loss
Damper Travel
Restricted
Check to ensure the damper is not blocked.
Compressor(s) Do
Not Start
No Input Signal from
Thermostat
Check for 24 VAC on G, Y1 and Y2 (if applicable) at TB1. If not present, check the
set point at the T-Stat, and the connections between the T-Stat and the rooftop. If
present, check for 24 VAC at G, Y1 and Y2 on the EconoMi$er controller.
Mechanical Cooling
Lockout in Effect
The outdoor air temperature is below Mechanical Cooling Lockout set point. Dis-
able Mechanical Cooling Lockout by turning the set point to full counterclockwise
position (off). Compressor(s) should start. Adjust to the desired set point.
Minimum Off or Interstage
Delay in Effect
Minimum off time of 2 minutes of interstage time of 2 minutes may be keeping
compressor off. Wait for completion of the time delay before taking further action.
Status Light is
Flashing
Fault Condition
Refer to Table 6 for a list of Flash Codes and the appropriate action.
Power Exhaust Does
Not Start
No Primary Power Supply
Reset the MIN POS (%) to 100%. The OA Damper should open, and both fans
should energize. Reset MIN POS (%) to the correct setting.
Make sure line voltage was correctly installed, and proper voltage is present.
Verify the 2 auxiliary settings within the actuator are correct.
Make sure 3-pin and 4-pin Molex connections are tight and properly installed.
