INLET AND OUTLET CONNECTIONS
General:
Use an open-end wrench, not a pipe wrench, to install accessories to the AutoSwitch system.
ALWAYS hold the bulkhead fitting with a wrench when installing the accessories to the
AutoSwitch system. Do not allow the bulkhead fitting to turn; otherwise, connections inside
the box may be loosened.
NPT connections require the use of PTFE tape on the threads to make
a gas tight seal (see Figure 6). CONCOA uses PTFE tape on all of its NPT connections. Follow
these rules when using PTFE tape.
a. Do not use oil or grease on fittings. This is especially important for oxidizing gas service.
b. PTFE tape must be used on NPT threads to ensure a gas tight seal. Avoid impinging on the gas stream.
On stainless steel connections, PTFE tape also helps to prevent the connections from galling together
when tightening or loosening.
c. Before applying PTFE tape, inspect the NPT threads, and, if necessary, clean the fitting to remove any dirt
or thread sealant that remains on the threads.
d. Start the PTFE tape on the first thread leaving a slight section of the chamfer exposed as shown in Fig. 6.
Make sure the tape does not overlap the end of the fitting.
e. As tape is wound in the direction of the thread spiral, pull tightly on the end of the tape so that the tape
conforms to the thread.
f. Apply at least 2 but no more than 3 layers of tape to the threads, and cut off excess tape.
g. Press the end firmly into the threads.
Figure 6 - Pictorial View of Tape Seal
Installing the inlet connection:
Warning: The left bank of the AutoSwitch system has a maximum working pressure of
600 PSI (41 bar). Do not install high pressure cylinders to the left bank of the
AutoSwitch system.
When using a Maniflex system:
The ½ male NPT end of the manifold connector will need to be installed in the inlet port of the
AutoSwitch. The other end of the manifold connector will be connected to the starter block of the
528 series Maniflex system. Please follow the instructions provided with the Maniflex system when
connecting and operating the manifold system.
Figure 7 - Manifold connector for the Maniflex system
-7-
1/2” NPT M
1/2” NPT M
