4
SEASONAL SHUTDOWN:
In preparation for seasonal shutdown, it is advisable to pump down the system and valve-off the bulk of the
refrigerant charge that might be lost due to any minor leak on the low-pressure side of the system.
1.
Close the liquid line shutoff valve at the condenser and start the system. When the suction pressure drops to
the cutout setting of the low-pressure control, the compressor will stop.
2.
Open the compressors electrical disconnect switch, to prevent the compressor from restarting and then front
seat the compressor discharge and suction valves.
3.
Using a refrigerant leak detector, check the condenser and liquid receiver, if used, for refrigerant leaks.
4.
Valve-off the supply and return water connections of a water-cooled condenser. Allow the condenser to
remain full of water during the off season. A drained condenser shell is more likely to rust and corrode than
one that is full of water.
A.
If the condenser will be subjected to freezing temperatures, drain the water and refill with an
antifreeze solution.
5.
Drain the cooling tower or evaporative condenser, if used, flush the sump and paint any rusted or corroded
areas.
6.
Open the systems master disconnect switch and padlock in the open position.
SEASONAL START-UP:
1.
Perform all annual maintenance on the air handling system and other related equipment.
2.
Fill the water sump of the cooling tower or evaporative condenser, if used.
3.
Open the shutoff valves of a water-cooled condenser.
4.
Make certain that the liquid line solenoid valve(s) is on automatic control.
5.
Open the liquid line shutoff valve.
6.
Back seat the compressor suction and discharge valves.
7.
Close the systems master electrical disconnect switch.
8.
Start the system.
