3.12.1 Gas pressure
The boilers require a minimum inlet gas supply pressure of 4.0" w.c. for natural gas or propane
during high fire operation. For either fuel, the inlet pressure shall be no greater than 14.0" w.c.
Confirm this pressure range is available with your local gas supplier.
The inlet gas connection to the boiler is ½" NPT (female).
Adequate gas supply piping must be installed with no smaller than ½" Schedule 40 (e.g., Iron Pipe
Size (IPS) and using a 1" w.c. pressure drop, in accordance with the following table.
Maximum Pipe Length (ft)
Model ½ inch IPS ¾ inch IPS 1 inch IPS 1¼ inch IPS
SL 10-85 G3, SL14-115 G3 (Natural Gas) 30 ft 125 ft 400 ft -
SL 10-85 G3, SL14-115 G3 (Propane) 90 ft 350 ft 1,000 ft -
SL 20-160 G3 (Natural Gas) 10 ft 70 ft 200 ft -
SL 20-160 G3 (Propane) 50 ft 200 ft 600 ft -
SL 30-199 G3 (Natural Gas) 10 ft 40 ft 150 ft 600 ft
SL 30-199 G3 (Propane) 30 ft 125 ft 400 ft 1,600 ft
Table 9 Maximum Gas Pipe Length (ft)
Gas piping must have a sediment trap ahead of the
boiler’s gas valve. A manual shutoff valve must be
located outside the boiler, in accordance with local
codes or standards. All threaded joints in gas piping
should be made with an approved piping compound
resistant to the action of natural gas or propane. Use
proper hangers to support gas supply piping as per
applicable codes.
Figure 47 Typical gas piping
Install manual shut-off valve. Check local code for height requirement
Full-sized sediment trap
Union
The boiler must be disconnected or otherwise isolated from the gas supply during any pressure
testing of the system at test pressures in excess of ½ psig. Dissipate test pressure prior to
reconnecting. The boiler and its gas piping must be leak-tested before being placed into operation.
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