* Follow the instructions from the gas supplier.
Gas connection
Gas flex lines are not recommended unless they are
sized for the maximum input kW (Btu/h • MJ) of each unit.
Do not use piping with a diameter smaller than the size
of the gas inlet to each unit.
After installation, check the gas line for any leaks before using.
* Ask a qualified plumber to perform the installation.
* Observe all applicable codes.
● The plumbing should be installed by a qualified plumbing contractor according to all applicable codes and regulations.
● Insulate or apply heating materials to the supply and hot water piping to prevent freezing during cold weather and to
prevent heat loss through the piping.
● Use a union coupling or flexible pipe for connecting the units to ease service and maintenance.
● Refer to the system diagrams for supply and hot water pipe sizing. Do not install piping that is smaller than the inlet or
outlet water connections on the units.
● If using an expansion tank, make sure it is correctly sized for the system.
● Use only copper or stainless steel pipe for all plumbing.
● Keep the plumbing as simple as possible.
● Avoid using pipes in which air can accumulate.
* Use only approved materials, and have the installation inspected upon completion.
Gas Valve
Install a gas shutoff valve for every unit installed.
Gas Meter
Select a gas meter capable of supplying the entire kW (Btu/h •
MJ) demand of all gas appliances that the meter serves. Size
the gas line for the entire kW (Btu/h • MJ) demand also.
Gas piping
Water piping
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