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CAUTION: REFRIGERANT!
If both suction and discharge pressures are low but sub‐cooling is normal, a problem other than refrigerant shortage
exists. Do not add refrigerant, as this may result in overcharging the circuit.
Use only the refrigerant specified on the unit nameplate. Contact G&D for the recommended oil type or refer to the
data plate on the compressor for your specific chiller. Failure to do so may cause compressor damage and improper
unit operation.
WARNING: HAZARDOUS VOLTAGE!
Disconnect all electric power, including remote disconnects before servicing. Follow proper lock‐ out/tagout
procedures to ensure the power cannot be inadvertently energized. Failure to disconnect power before servicing
could result in death or serious injury.
FREEZE PROTECTION
The chiller system must be protected from freezing by use of a freeze inhibitor. The solution must be strong enough
to provide protection against ice formation at the lowest anticipated ambient temperature, and at least 20° cooler
than the lowest set point.
A minimum of 35% Propylene Glycol is required. Do not exceed 40%.
NOTICE: Equipment Damage!
In order to provide freeze protection in the event of a power loss you MUST use sufficient freeze inhibitor in the
chiller.
NORMAL SHUTDOWN
1. Perform the normal unit stop sequence using the chiller pump down/run switch.
2. Verify that the chiller, and process pumps are cycled off.
3. Verify that the oil heaters are working.
Note: Do not open the external chiller disconnect switch. This must remain closed to provide control power from the
control power transformer to the oil heaters.
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