Schwank STS-JZ Installation & Owner's Manual page 36

FIGURE 23 ORIENTATION OF FLEXIBLE GAS CONNECTOR
The flexible gas connector MUST be installed in the orientation shown below as
required by national installation codes and by the certification standard of this
heater. This orientation protects the flexible gas connector from damage due to
movement during heater expansion.
It is the responsibility of the installer to ensure correct installation of the flexible gas supply.
The flue vent, and combustion air duct (if installed) must also be configured in such a manner
that the normal expansion of the heater will be accommodated.
STS-JZ-F / IQ-F I&O Manual
IM101220
RD: MAY 2014
RL: 17A
36
See Section 11.