Instruction Manual

Benchmark 750/1000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
OMM-0082_0J AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 23 of 192
GF-130 Ph.: 800-526-0288 05/21/2014
2.8.2 Manual Gas Shutoff Valve
A manual shut-off valve must be installed in the gas supply line upstream of the boiler as shown
in Figure 2-7. Maximum allowable gas pressure to the boiler is 14” W.C.
2.8.3 External Gas Supply Regulator
An external gas pressure regulator is required on the gas inlet piping under most conditions
(see sections 2.8.3.1 and 2.8.3.2, below). Regulators must conform to the following
specifications:
• NATURAL GAS: The external natural gas regulator must be capable of regulating
49,000 – 1,020,000 BTU/HR while maintaining a minimum gas pressure of 4.0” W.C. to
the unit.
• PROPANE: The external natural gas regulator must be capable of regulating 49,000 –
1,020,000 BTU/HR while maintaining a minimum gas pressure of 11.0” W.C. to the unit.
• A lock-up style regulator MUST be used when gas supply pressure will exceed 14” W.C.
2.8.3.1
Massachusetts Installations Only
For Massachusetts installations, a mandatory external gas supply regulator must be
positioned as shown in Figure 2-7. The gas supply regulator must be properly vented to
outdoors. Consult the local gas utility for detailed requirements concerning venting of the
supply gas regulator.
2.8.3.2
All Installations (Except Massachusetts)
For multi-unit installations (other than Massachusetts) that EXCEED 7” W.C. gas pressure, a
separate external gas supply regulator, as shown in Figure 2-7, is highly recommended. No
regulator is required for gas pressures below 7” W.C. of pressure. Consult the local gas
utility for detailed requirements concerning venting of the supply gas regulator.