A
CU MANUAL
IOM-14
32 of 46
Feb 06 R4
1 1/2" (40mm)
23.
Check system charge:
When thermostatic expansion valves (TX valves) are provided, the charge can be checked with the
liquid line sight glass. Under normal operating conditions the sight glass is clear of bubbles. Refer
to Charging Instructions.
NOTE: It is possible for conditions other than low refrigerant charge to cause the sight glass to
bubble. Bubbling may occur when condenser fans cycles on, superheat setting is too low or filter-
drier is plugged etc.
The TX valve superheat was checked and adjusted at the factory to maintain a superheat of 18°F
(10°C) plus or minus 3°F (2°C) measured on the suction line 10 inches (250mm) from the
compressor. This setting rarely requires readjustment. Should adjustment be necessary, refer to
the TX valve manufacturers recommendations.
24.
Condenser fan blades: Fan blades must
be correctly positioned within the orifice
for proper air flow.
25.
Set all controls to the settings indicated
on the wiring diagram.
26.
Re-install all access panels.
27.
Remove any packing material or debris and dispose appropriately.
