Nortec GS Series - Manual (Page 34)

31 | GS Series Installation
Gas Piping
Installation of piping must be in accordance with local codes, and the National Fuel Gas Code ANSI Z223.1
in the United States or CSA B149.1 Installation Codes in Canada.
Refer to the indoor gas piping installation guidelines for gas line sizes, pressures, leak testing procedures,
and safety instructions.
Gas lines are to be routed to the outside connection on the right side near the back of the unit. The
installation of a sediment trap and a certified manual shut-off valve are required outside of the unit. The gas
piping must not block access to or prevent opening of the right side service door. Refer to Figure 22 for
details.
Nortec recommends that each Gas Fired Humidifier has its own regulator installed in line to the unit. The
operating Natural Gas pressure supplied for the GS units must be in the range of 5-9” of Water Column and
propane version 10-14” of Water Column.
Over pressure protection devices shall be provided to prevent the pressure in the piping system from
exceeding that value that would cause unsafe operation of any connected and properly adjusted Gas
utilization equipment. See Figure 23.
Figure 22: Gas Piping Figure 23: Gas Piping with Over Pressure Device
If the system has a pressure that is higher than the max working pressure of our humidifier, then an Over
pressure protection system is required. If there is an Over pressure protection device installed, it MUST
consist of 2 devices in Series. (A pressure regulator plus one other device) Both these devices must be able
to work on their own without damaging any downstream piping or appliance, and the only way the
downstream system can be damaged is by the failure of both devices.