Schreiber Chillers Modular Chillers - Manual (Page 32)

32
CRANK CASE HEATERS
This unit has a CRANK CASE HEATER on the compressor. It is important to the life of this compressor that
you follow the instructions. This low wattage heater protects the compressor when it is idle by producing just
enough heat to keep the Freon from accumulating in the compressor. Under certain specific conditions this
heater will prevent the compressor from slugging causing damage to its internal parts.
These Heaters were wired at our factory in such a way that allows the heater to be on any time the disconnect
switch on the chiller is on. When you want to turn the water pump or refrigeration compressor off, you must only
use the manual switches on the electrical enclosure as marked. When you use the disconnect to turn the unit
off you kill the power to the crank case heaters. ONLY use the disconnect to turn off power if you are going to
work on the electrical system.
AN IMPORTANT FACTOR- READ
SPECIAL INSTRUCTIONS FOR CRANK CASE HEATER
When the unit is first received, the power to the chiller should be on for 3 hours. That means you must at this
time have the unit disconnect on. The manual water pump and refrigeration switches should be off. This will
allow the refrigeration compressor to warm up, driving out the Freon (R22) that had migrated to the compressor.
The crank case heater is HIGH VOLTAGE. But it is only very low wattage. Caution should be taken when
working on the crank case heater to make sure the POWER is off.
Any question call for more details at Schreiber Engineering 562-926-3855.
MAINTENANCE INFORMATION
1. There are no lubrication points on the chiller. All motors have permanent lubrication in the bearings.
2. The water that is used in the chilled water circuit has no special requirements, except that deionized
water cannot be used. The water should be clean and some type of water conditioner can be used.
Nothing should be used in the chilled water circuit that could damage the all copper Heat Exchanger.
Deionized water may be used only if the water resistance is between 2,000 to 166,000 Ohms.
3. The air-cooled condenser should be cleaned on a regular basis, depending on the environment the
chiller is installed in.
4. The water level should be maintained as close to the level as marked on the water sight glass. You
cannot damage the refrigeration system by the water being at a low level; it will only affect the efficiency
of the unit.
5. Caution: The receivers and water pump motor could be hot enough to injure one touching these
components.
6. Please note: This is a hermetically sealed compressor. There are not necessary maintenance
requirements. Please read the service bulletins before making any repairs.