Carrier 19QA - Manual (Page 11)

DISCHARGE
WATER
CONNECTIONS
Refrigerant Hose
Water Hose
Direct Coupled Connection
Factory-Installed Copper Tubing
Fig. 11 — Refrigerant Vapor Transfer/Evacuation Connections
TO TRANSFER REFRIGERANT - Open all valves be­
tween the chiller and storage tank. Turn on the water to the
tube-in-tube condenser. Turn on the pump. After a few min­
utes, the condensed vapor will be seen in its liquid form
flowing through the liquid indicator to the storage tank. The
end of the vapor transfer can be determined by observing
the liquid indicator. When liquid is no longer visible, the
transfer is complete.
A CAUTION
Be sure to run the chiller water pumps when removing
refrigerant vapor. Trapped liquid may boil and can cause
tube freeze-up.
The vapor recovery process is complete when the vac­
uum in the chiller has reached 29 in. Hg (25 mm Hg). Be­
fore turning off the pump, shut off the water to the tube-
in-tube condenser and then drain the water from the condenser.
As the condenser warms up, it will help drain any liquid
remaining in the condenser and refrigerant hose into the stor­
age tank. Turn off the pump. Close the valves to the stor­
age tank and chiller. Disconnect the refrigerant hoses. Any
refrigerant vapor remaining in the refrigerant hoses and the
tube-in-tube condenser are considered to be de minimis. See
Fig. 12.
Use the same process when transferring vapor refrigerant
from the storage tank to the chiller.
10 20 30
WEIGHT (Kg OF CFC-11)
Fig. 12 — Refrigerant Vapor Remaining
in Chiller After Removal
of Liquid Refrigerant (400 Ton Unit)
40
11