INSTALLATION GUIDE • USER MANUAL
VERTICAL AIR SERIES
31
Clean the condenser coils. Refer to "Coil Cleaning" in this manual. Please refer to preventative maintenance (next
page) for items to verify the chiller is in perfect working order. Note that the fields highlighted in yellow are things
the owner/operator can perform. All other fields should be filled out by a licensed technician. Feel free to send the
completed form to
for review to ensure your chiller is to factory spec.
WARNING:
Position all electrical disconnects in the "OPEN" position and lock them to prevent injury of death due
to electrical shock or moving parts.
Clean the condenser fans. Check the fan assemblies for proper clearance in the fan shroud openings and for motor
shaft misalignment or abnormal end-play, vibration and noise.
CONDENSER MAINTENANCE
Clean the condenser coils at least once a year or more frequently if the unit is in a "dirty" environment. A clean
condenser coil will help to maintain chiller operating efficiency.
Follow the detergent manufacturer's instructions to avoid damaging the condenser coils.
To clean the condenser coils, use a soft brush and a sprayer such as a garden pump type or a high- pressure type. A
high-quality detergent is recommended.
Note: If detergent mixture is strongly alkaline (pH value greater than 8.5, an inhibitor must be added).
EVAPORATOR MAINTENANCE
G&D liquid chillers use brazed plate heat exchanger (BPHX) evaporators with factory-installed electronic flow switch
that is positioned in the evaporator fluid outlet pipe.
Note: Strainer maintenance is critical to proper operation and reliability. Any particles larger than 1mm entering the
BPHX evaporator may cause the evaporator to fail, requiring replacement.
The BPHX evaporator is difficult to clean should it become plugged with debris.
Indications of a plugged evaporator include "wet" suction due to lack of heat exchange, loss of superheat control,
depressed discharge superheat (superheat less than 63°F), compressor oil dilution and/or starvation and premature
compressor failure.
EVAPORATOR REPLACEMENT
If the evaporator requires replacement, it is very important that the new evaporator be replaced correctly and with
the correct refrigerant and fluid piping connections. The refrigerant inlet/liquid connection is at the bottom of the
evaporator and the refrigerant outlet/suction connection is at the top of the evaporator and both are on the same
side. Avoid cross-circuiting when installing the new evaporator.
WATER STRAINER MAINTENANCE
The field-installed strainer should be equipped with a blowdown valve. The strainer shall be 20 mesh or higher. For
maximum efficiency, a differential pressure gauge installed across the inlet and outlet will indicate pressure loss due
to clogging and may be used as a guide to determine when cleaning is required. Normally when differential pressure
reaches 5-1Opsi, the screen must be cleaned. To clean open the blowdown valve, and flush out until evacuation is
complete.
G&D CHILLERS, INC.
•
GD-VA-R2022C
