PF X4-400, Installation And Operation Manual

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5.7 Install vent lines from main gas regulator (if used) and diaphragm gas valve where applicable.
Vent lines should be run to the outside of the building, terminating clear of windows or fresh air
intakes. Outside termination of vent should have a screen to prevent insects from building nests
in vent pipe. The vent should terminate in a manner, which will preclude the possibility of water,
dirt or other foreign matter from entering the line.
Figure 3 UL Gas Piping Train (X4) – See Figure 11B, page 17, for X4M
5.8 Test gas lines for leaks using a soap solution. Your local gas service company may wish to execute or
witness this test. CAUTION – gas pressure above 14” w.c. may damage the standard diaphragm gas
shut-off valve. Do not exceed this value when pressure testing lines unless you cap off line upstream of
main gas cock and pilot take-off.
5.9 Check that side orifice size is correct according to burner specification sheet (See Figure 4). To gain
access to orifice, remove Plug A and withdraw spring and orifice. When reinserting or replacing the
orifice, ensure that it seats properly inside the tee and reinstall plug.
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