Mammoth V-Cube - Manual (Page 49)

Appendix K: Troubleshooting
Table K1: Troubleshooting – V-Cube™
Symptom Possible Cause Corrective Action
General
Air supply too cold. Supply and exhaust air are unbalanced.
Check filters and enthalpy wheel for blockage. Balance flow
of supply and exhaust air so that exhaust air is equal or
greater than supply air. Install a post-heat module.
Noisy unit.
Blower wheel is rubbing on other parts. Adjust wheel or replace defective part.
Blower wheel is out of alignment. Remove the motor/blower assembly. Adjust the blower wheel.
Sheaves are out of alignment. Verify wheel alignment. Align belt using a straight edge.
Excessive belt tension causes bearings to screech. Adjust belt tension.
Low belt tension causes belts to squeal. Adjust belt tension.
Ducts are vibrating. Install flexible connections.
Unit is too close to occupants. Install a silencer.
Bearings wear down
too quickly. Excessive vibration. Replace shaft and bearings. Verify wheel alignment.
Belt too tight. Adjust belt tension.
Poor airflow.
Fan wheel is turning the wrong direction.
Reverse rotation or motor so that wheel turns in the
direction of the arrows shown on the fan.
Rotation speed is too low.
Increase speed by increasing the diameter of motor sheave
or installing a smaller fan sheave.
Filters are blocked. Replace filters.
Air leakage. Seal all leaks in ducts and unit walls.
Fan belt is slipping. Adjust belt tension.
Fan motor overload.
Low static pressure.
Verify presence of filters and other duct components. Set
balancing damper so that it reduces the passage of air.
Electric tension of motor is too low/high. Adjust tension.
Excessive fan speed. Reduce blower speed.
Low motor power. Install more powerful motors.
Exhaust fan not
working.
Unit equipped with recirculation defrost system is in
defrost mode.
Wait until the defrost cycle is over.
A wire is disconnected. Connect the wire.
Filters are out of filter
rack.
Filters are too dirty and have been sucked into the
unit. Clean or change the filters and consider revising
maintenance schedule.
Filters are wet.
Water infiltration or condensation. See Water Issues section
below.
Filter rack is damaged. Repair filter racks and reinstall filters.
Some filter clips are missing. Order new clips from Venmar CES.
Water Issues
Water carryover from
wet cooling coil onto
the floor, motor or fan
housing.
Airflow is too high. Lower airflow by adjusting the drive.
Drain pan not properly draining.
Clean drain pan and ensure suction into the unit is not too
high.
Coil bulkhead penetration. Be sure any field penetrations are sealed.
Missing or improper intermediate drain pan. Install or clean the intermediate drain pan.
Water inside the unit.
Unit was not properly sealed when installed.
Seal all section joints. Sections under negative pressure
require special attention to sealing.
Electrical or piping conduits not properly sealed.
Inspect and seal any holes made for electrical wires or
piping conduits.
Drain pan not properly
draining.
Trap is not properly installed. Revise trap installation and dimensions.
Unit is not installed on level. Revise the level of curbs.
Pressure exceeds the design.
Verify design pressure versus unit pressure and check the
segment which houses the drain pan.
VCES-V-CUBE-IOM-1A 49