Maximum Gas Pipe Length (ft)
Model 1¼" IPS 1½" IPS 2" IPS 2½" IPS
EX 700 (Natural Gas) 50' 100' 350' 800'
EX 700 (Propane) 150' 300' 900' 2000'
EX 850 (Natural Gas) 40' 80' 250' 600'
EX 850 (Propane) 100' 200' 700' 1600'
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.
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 shall 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 (see Figure 2 on page 1). Note that manifold pressure varies slightly in
accordance with firing rates with the modulating series boilers, but will always
be close to 0" wc. An adapter fitting is supplied with the boiler.
Figure 32 Typical gas piping
3.10 Electrical connections
All electrical wiring to the boiler (including grounding) must conform to local
electrical codes and/or to the National Electrical Code, ANS/NFPA No. 70 –
latest edition, or to the Canadian Electrical Code, C22.1 - Part 1.
3.10.1 Power quality and electrical protection
In areas of unreliable power, appropriate surge protectors and or power conditioning equipment should be
installed in power supply wiring circuits.
3.10 Electrical connections
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