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Section 3 • Installation
System Refrigerant Charging
After the system is leak-free and evacuation has been
completed, the entire operation of the refrigeration sys-
tem should be inspected before charging.
A. Low Side Equipment
1. Fans on air handling equipment running.
2. Pumps on water cooling equipment running.
3. Proper location and attachment of thermostatic ex-
pansion valve bulb to suction line.
4. Correct fan and pump rotation.
5. Evaporator pressure regulators and solenoid valves
open.
6. Water pumps and motors correctly aligned.
7. Belt drives correctly aligned and tensioned.
8. Proper voltage to motors.
B. Compressors
1. Proper oil level.
2. Voltage agrees with motor characteristics.
3. Properly sized motor fuses and heaters.
4. Direct drivers aligned and couplings tight.
5. All suction and discharge valves open.
6. All transducers and RTDs calibrated and reading
correctly.
C. Condensers
1. Water available at water cooled condensers and sup-
ply line valve open.
2. Water in receiver of evaporative condenser and
makeup water available.
3. Correct rotation of pump and fan motors.
4. Belt drives aligned and tensioned correctly.
5. Pump, fans and motors lubricated.
D. Controls
Controls should be at the initial set points. See micro-
processor manual for further information.
3 – 22
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
Initial High Side Charging
WARNING
When working with refrigerants, ensure there is
adequate ventilation and refrigerant vapor detectors
as per ASHRAE standards. Failure to comply may
result in serious injury or death.
WARNING
Avoid skin contact with any liquid refrigerant or oil.
Wear rubber gloves and a face shield when working
with liquid refrigerant or oil. Failure to comply may
result in serious injury or death.
CAUTION
Ensure compressor unit has been charged with
the correct amount of oil prior to initial refrigerant
charging. Failure to comply may result in damage to
equipment.
CAUTION
Do not apply fl ame or steam directly to drum, as this
can produce dangerously high pressures inside drum.
Failure to comply may result in damage to equipment.
There are two methods of charging refrigerant into the
system, through the "high side" or through the "low
side". High side charging is usually used for initial charg-
ing as filling of the system is much faster. Low side charg-
ing is usually reserved for adding only small amounts of
refrigerant after the system is in operation.
High side charging of refrigerant into the system is ac-
complished as follows:
1. Connect a full drum of refrigerant to the liquid
charging valve. This valve is generally located in the
liquid line immediately after the king or liquid line
valve. Purge the air from the charging line.
2. Close the liquid line or king valve, if it is not already
closed. Open the "Liquid" charging valve slowly to
allow refrigerant to enter the system. The vacuum
in the system will draw in the refrigerant.
3. It is important that during this operation air handling
units be running and water is circulating through
the chillers. The low pressures on the system can
cause the refrigerant to boil at low temperature and
possibly freeze the water if it is not kept circulating.
Water freezing in a chiller can rupture the tubes and
cause extensive damage to the system. It would be
desirable to charge the initial amount of refrigerant
without water in the shell and tube equipment to
eliminate the possibility of freeze up.
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Troubleshooting
