Unit Cooler Troubleshooting - Turbo Air KUCTB2503 Installation & Operation Manual

filter/drier in the charging line. This extra drier
will insure that all refrigerant supplied to the
system is clean and dry. Weigh the refrigerant
drum before charging so an accurate record can
be kept of the weight of refrigerant put in the
system. Liquid refrigerant can be added directly
into the receiver tank and charging 90% of system
refrigerant capacity.
Start the system and finish charging until the sight
Start-up.
Use the following operating procedure after the installation has been completed,.
1) Check all electrical and refrigerant connections. Check if the electrical status is in manual and if
there are no holes in the refrigerant lines. Start-up
2) Check all fans on the evaporator and condensing unit to be sure they are operational and turning
the proper direction.
3) Check high and low pressure switch, pressure regulating valves, and adjust if necessary.
4) Continue charging until system has sufficient refrigerant for proper operation. Do not
overcharge. Bubbles in a sight glass may be caused by a restriction as well as a shortage of
refrigerant. Check service valve and open if refrigerant is sufficiently charged and you still have
bubbles in the sight glass.
5) Observe system and do not leave unit unattended until the system has reached normal operating
conditions.
WARNING : SCROLL COMPRESSOR IS DIRECTIONAL
DEPENDENT. IF NOISY, SWITCH ANY TWO SUPPLY LINES.

Unit Cooler troubleshooting.

Symptoms
Insufficient refrigerant
Cooling is
insufficient. (Room
Too much oil in unit cooler
glass indicates a full charge and the proper
amount have been weighed in. If the refrigerant
must be added to the system through the suction
side of the compressor, charge in vapor form only.
Liquid charging must be done in the high side
only and with liquid metering devices.
If R-404A is used, liquid must be charged and
read up refrigerant explanatory.
Possible causes
15
Solution
Add refrigerant
Check the easy oil return in suction line.