CONNECT GAS PIPING
7. CONNECT GAS PIPING
A.INSTALL GAS TRAIN
1.The Gas Control Train(s) supplied with this boiler:
•Has been factory assembled and tested for tightness of joints.
•Must be
•Must be isolated from the gas supply piping during testing of the supply piping.
2.Assemble the Gas Control Train(s) to the Manifold with the ground joint union(s) provided. See Figure 7.1. Models
3.Support the Gas Control Train(s) with a permanent brace.
B.CONNECT PILOT GAS TUBING
1.Use 3/8" aluminum tubing or as required by local codes.
2.Connect the Pilot Line to the Pilot Cock Assembly supplied with the Gas Control Train.
3.Connect tubing to each pilot.
a.Connect electronic pilots to the Pilot Gas Valves.
b.Connect standing pilots (when supplied – see Table 2.2) to the thermopilot valves.
c.Install thermocouples in the standing pilots and connect to the thermopilot valves.
C.INSTALL VENT AND BLEED PIPING
1.Gas Pressure Regulator
a.Connect regulator vent outlet to outside atmosphere using 1/4" tubing or as required by local codes.
b.Terminate the tubing downward to prevent water from entering the tubing and protect from any obstruction.
c.Terminate the tubing above and well away from normal breathing level or building air intakes.
2.Diaphragm Gas Valves
a.Pipe diaphragm gas valve bleed lines to outside atmosphere unless the boiler is equipped with a standing pilot. On standing pilot boilers, pipe the valve bleed lines to the bleed piping
b.Use 1/4" tubing or as required by local codes. Always pipe the bleed lines separate from the regulator vent lines.
Figure 7.1: Gas Control Train and Burner Assembly, Single Natural Gas Control Train Shown (Models 211A-19 and Larger Use Two or More Gas Control Trains)
29
