Trane PTAC-SVX01C-EN User Manual

34

PTAC-SVX01C-EN

4.

Start the vacuum pump and 
open the shut-off valve to the 
high vacuum gauge manifold 
only. After the compound gauge 
(low side) has dropped to 
approximately 29 inches of 
vacuum, open the valve to the 
vacuum thermocouple gauge. 
See that the vacuum pump will 
bank-off to a minimum of 50 
microns. A high vacuum pump 
can only produce a good vacuum 
if its oil is not contaminated.

5.

If the vacuum pump is working 
properly, close the valve to the 
vacuum thermocouple gauge 
and open the high and low side 
valves or the high vacuum 
manifold set. With the valve on 
the charging cylinder closed, 
open the manifold valve to the 
cylinder.

6.

Evacuate the system to at least 
29 inches gauge before opening 
valve to thermocouple vacuum 
gauge.

7.

Continue to evacuate to a 
minimum of 250 microns. Close 
valve pump and watch rate of 
rise. If vacuum does not rise 
above 1500 microns in three 
minutes, system can be 
considered properly evacuated.

8.

If thermocouple vacuum gauge 
continues to rise and levels off at 
about 5000 microns, moisture 
and non-condensables are still 
present. A leak is present if the 
gauge continues to rise. Repair 
and re-evacuate.

9.

Close valve to the thermocouple 
vacuum gauge and vacuum 
pump. Shut off pump and 
prepare to charge.

Charge the system with the exact 
amount of refrigerant. Refer to the 
unit nameplate for the correct 
refrigerant charge. An inaccurately 
charged system will cause future 
problems.

1.

When using an ambient-
compensated calibrated 
charging cylinder, allow liquid 
refrigerant only to enter the high 
side. 

2.

After the system receives all the 
refrigerant it requires, close 
close the valve on the high side 
of the manifold.

3.

Start the system and charge the 
balance of the refrigerant though 
the low side. Do not charge in a 
liquid form.

4.

Close the low side valve on the 
manifold and pinch-off both 
process tubes. Remove the 
manifold set. Crimp shut the 
open ends of the process tubes 
and braze.

5.

Recheck for refrigerant leaks.

Do not use a refrigerant other than 
that shown on the unit nameplate. 
Follow all precautionary measures 
recommended by the refrigerant 
manufacturers.

Line piercing valves may be used for 
diagnosis but are not suitable for 
evacuating or charging due to the 
minute holes pierced in the tubing.

Line piercing valves must not be left 
on the refrigerant system. The 
connection between the valve and 
the refrigerant tubing is not 
hermetically sealed and will 
eventually leak.

Never leave refrigerant lines open to 
the atmosphere when processing the 
refrigeration system. Water vapor 
may enter the lines and cause 
improper evacuation.

The final step in a successful repair is 
an accurate operating test. Follow the 
cooling and heating performance 
tests on pages 36 - 37 to make sure 
the product is performing to design 
standards.

Place discharge and 
inlet air thermostats

Place inlet thermostat
in center of grille