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Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 2 – INSTALLATION
2.9.3 External Gas Supply Regulator
An external gas pressure regulator is required on the gas inlet piping under most conditions
(see, below). Regulators must conform to the specifications shown in the tables below.
The external natural gas regulator must be capable of regulating the following BTU per hour
while maintaining the minimum gas pressure listed below:
TABLE 2-3a: NATURAL GAS Regulator Capacity
Model
BMK 750/1000
49,000 – 1,020,000 (14.3 – 299)
BMK 1500
100,000 – 2,120,000 (29.3 - 621.3) 6.0" W.C. (1.49 kPa)
BMK 2000
100,000 – 2,120,000 (29.3 - 621.3) 8.5" W.C. (2.12 kPa)
BMK 2500/3000
150,000 – 3,180,000 (44 - 932)
TABLE 2-3b: PROPANE Gas Regulator Capacity
Model
BMK 750/1000
49,000 – 1,020,000
BMK 1500/2000
100,000 – 2,120,000 (29.3 - 621.3) 4.0" W.C. (1.0 kPa)
BMK 2500/3000
150,000 – 3,180,000 (44 - 932)
A lock-up style regulator MUST be used when gas supply pressure will exceed 14" W.C. (3.49
kPa).
2.9.3.1 Massachusetts Installations Only
For Massachusetts installations, a mandatory external gas supply regulator must be
positioned as shown in Figure 2-7a, 2-7b and 2-7c. 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.
2.9.3.2 All Installations (Except Massachusetts)
For installations with 3 or more units (other than Massachusetts) that EXCEED 7" W.C. (1.7
kPa) gas pressure, a separate external gas supply regulator, as shown in Figure 2-7a, 2-7b
and 2-7c, is highly recommended. No regulator is required for gas pressures below 7"
W.C. (1.7 kPa) of pressure. Consult the local gas utility for detailed requirements concerning
venting of the supply gas regulator.
NOTE:
It is the responsibility of the customer to source and purchase the appropriate gas regulator as
described above. However, AERCO offers for sale an appropriate regulator, which may be
ordered at the time of unit purchase or separately. Contact your AERCO sales representative
for more information.
OMM-0121_D • GF-205 • 5/9/2019
BTU/HR (kW)
BTU/HR (kW)
(14.3 – 299)
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Minimum Gas Pressure
4.0" W.C. (1.0 kPa)
8.0" W.C. (1.99 kPa)
Minimum Gas Pressure
11.0" W.C. (2.74 kPa)
4.0" W.C. (1.0 kPa)
Page 28 of 122
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