Scholar V VAIVA Maintenance & Service Manual 10/2017 Rev.2
36
Unit Overcools Room
1. When in the dehumidification mode, the unit stays in cooling but cycles the hot gas
valve to put hot refrigerant into the reheat coils. This valve cycles on and off to keep the
supply air temperature close to the cooling set-point.
ס This mode is active when the humidity has not been satisfied but the room
temperature has been satisfied OR, when the humidity has not been satisfied for 30
minutes (adjustable on HMI).
ס Check the hot gas valve (Item 8) to be sure it is cycling on and off. Hot gas should
be flowing when the valve gets energized. The cycle rate is controlled by the PLC
and the supply air thermocouple.
Water is on the floor
1. This is likely a condensate drainage issue
ס Check all condensate hoses and traps. Be sure connections are tight and not
leaking.
ס Traps are made from either PVC plastic or loops of PVC reinforced tubing. Clean
drain tubes and traps by blowing out with compressed air or by running appropriate
solvent through them.
Unit makes excessive noise
1. Rattles?
ס Check for loose fasteners on cover panels.
ס Check for missing panels.
2. Compressor noisier than usual?
ס Check for loose panels.
ס Check for refrigerant leak. This could cause compressor to run faster than normal to
compensate for capacity loss.
ס Air noise.
■ Grill louvers have been closed off.
■ Extremely dirty air filter makes blower run faster.