Stulz CyberOne EC CW - Page 22

CyberOne EC CW IOM Manual
17
Symptom Probable Cause Recommendation
will automatically reset.
4. Over-temperature of electronics.
5. Over-temperature of motor. After causes 4
and 5 are corrected, the fan(s) must be manually
reset by turning off power for 20 seconds.
Defective fan. Repair or replace.
Control is
Erratic
Wiring improperly
connected or broken.
Check wiring against schematic diagram.
System
Short of
Capacity
Low chilled water flow Locate leak and repair. Recharge system.
Supply water temperature
too high
Remove and clean or replace valve.
Clogged drier/strainer (feels
cold).
Replace with new drier/strainer.
Reduced airflow
Dirty coil
Check filters and dampers.
Clear coil fins of debris.
Electric
Heater
Inoperable
Circuit breaker tripped Check for short circuit; reset circuit breaker.
Temperature setpoint too
low
Increase temperature setpoint.
Overheat switch open
Insufficient air flow across heater elements.
Check for dirty filters or obstructions that may
reduce air flow. Correct or replace as needed.
Manual reset overheat
safety switch tripped
Reset manual overheat safety switch (see item
immediately above).
Heater element burned out
Check continuity with an ohmmeter Replace
heater element.
Defective contactor Repair or replace.
Hot Water
Heater
Inoperable
Low hot water flow
Check hot water flow at supply source. Inspect
piping for leaks or obstructions.
Hot water supply
temperature too low
Check hot water supply.
Temperature setpoint too Increase temperature setpoint.