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.
Install manual shut-off valve. Check local code for height requirement
Full-sized sediment trap
Union
Figure 38 Typical gas piping
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.
The gas valve is provided with pressure taps to measure gas pressure upstream (supply
pressure) and downstream (manifold pressure) of the gas valve. Note that manifold pressure
varies slightly in accordance with firing rates with the modulating series boilers, but will always
be close to 0" wc.
3.13 Electrical connections
All electrical wiring to the boiler (including grounding) must conform to local electrical codes and/or
to the National Electrical Code, ANSI/NFPA No. 70 – latest edition, or to the Canadian Electrical
Code, C22.1 - Part 1.
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