8
9
Figure 6 - Pictorial view of tape seal
installation
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 Teflon
tape on the threads to make a gas tight seal. (See Figure 6.) On stainless steel connections, the thread sealant helps
prevent the connections from galling together when tightening or loosening. CONCOA uses Teflon tape on all of
its NPT connections. Follow these rules when using Teflon tape.
Inspect the NPT threads and if necessary, clean the fitting to remove any dirt or thread sealant that remains on the
threads. Start the Teflon tape on the second thread as shown in Figure 6; make sure the tape does not overlap the
end of the fitting. As the tape is wrapped in the direction of the thread spiral, pull tightly on the end of tape so that
the tape conforms to the threads. Wrap the tape around the threads twice. Cut off the excess tape and press the end
firmly into the threads.
Installing the inlet connection:
For Maniflex Manifold system installation:
System 621 X12X-CGA (typical manifold setup with the manifold connector) – see Figure 7 for locations of
components:
1. Tape the male NPT connections on the manifold connector using the procedure outlined above in Figure
6.
2. After taping the male NPT connections, thread the 1⁄2 NPT of the manifold connector into the bulkhead
connector of the autoswitch as shown in Figure 7. Wrench-tighten.
3. Remove the tube fitting from the opposite end of the manifold connector. The tube-fitting nut and body
hex must each be held with a wrench when loosening the tube fitting.
4. Thread the 1⁄4 NPT connection of the tube fitting just removed into the starter block of the manifold as
shown in Figure 7. Wrench-tighten.
5. Insert the tube fitting of the starter block into the pre-swaged tubing of the manifold connector as shown in
Figure 7. While holding the hex of the tube-fitting nut and body hex, rotate the wrench until a significant
increase in torque is felt; after the increase is felt, tighten slightly. Note: do not use the gap inspection gauge
to verify proper fitting makeup; the tube fittings on the manifold connector are pre-swaged at the factory.
