Mammoth V-Cube - Manual (Page 50)

Table K1: Troubleshooting – V-Cube™
Symptom Possible Cause Corrective Action
Prefilter is wet.
Outside air hood is shipped loose and was not well
sealed when installed.
Reinstall hood, ensuring the flange is properly sealed.
Airflow exceeds design conditions and sucks water
into the unit.
Redesign the hood or lower the cfm of the unit.
Refrigerant Issues
Solenoid valve does
not open. No power to coil. Check circuit connections.
Defective solenoid coil. Replace solenoid coil.
Too much refrigerant
is being fed to the
evaporator and the
superheat is too low
(cannot be adjusted). Dirt or foreign material lodged in thermostatic
expansion valve.
Disassemble valve, remove dirt and re-verify superheat.
Defective thermostatic expansion valve. Replace thermostatic expansion valve.
Compressors lockout
on high head pressure
or run at higher than
design head pressure.
Insufficient fluid flow across condenser coil.
Clean dirty condenser coil. Comb damaged fin surface with
fin comb. Tighten loose fan belt(s).
Condenser fan failure.
Verify fan rotation. Verify fan rpm. Check fuses. Verify
overload. Check fan controls. Check for motor burnout.
High pressure control. Check for proper setting.
Service valve failure. Discharge valve fully back sealed.
Refrigerant overcharge.
Verify condenser subcooling (15ºF [−9ºC]). If above 15ºF
[−9ºC], adjust charge based on maintaining suction
pressure.
Supply water temperature may be too high.
Verify water temperature rise entering and leaving unit to
determine if adequate water is flowing.
Water control valves not operating properly. Verify and repair water control valves.
Condenser fan(s) short
cycling.
Improperly set sequencing control. Set for correct pressure and differential.
VCES-V-CUBE-IOM-1A 50