External Gas Supply Regulator; Ac Electrical Power Wiring - Watts Aerco BENCHMARK 750 User Manual

Benchmark 750 – 1000 Boiler User Manual - INTERNATIONAL

2.8.3 External Gas Supply Regulator

An external gas pressure regulator is required on the gas inlet piping under most conditions.
Regulators must conform to the following specifications:
•
The external natural gas regulator must be capable of regulating 49,000 – 1,020,000
BTU/HR (14.3 – 299 kW) of natural gas while maintaining a gas pressure of 4.0" W.C.
(1.00 kPa) minimum to the unit.
•
A lock-up style regulator MUST be used when gas supply pressure will exceed 14"
W.C. (3.49 kPa)
For installations with 3 or more units that EXCEED 7" W.C. (1.74 kPa) gas pressure, an
external gas supply regulator, as shown in Figure 2-7, is highly recommended. No regulator is
required for gas pressures below 7" W.C. (1.74 kPa) of pressure. Consult the local gas utility
for detailed requirements concerning venting of the supply gas regulator.
MANUAL
SHUT-OFF
VALVE
NATURAL
GAS
INLET
DIRT TRAP
GAS PRESSURE REGULATOR
Figure 2-7: Manual Gas Shut-Off Valve Location
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 AERCO for more information.

2.9 AC ELECTRICAL POWER WIRING

The AERCO Benchmark Electrical Power Wiring Guide, GF-2065, must be consulted prior to
connecting any AC power wiring to the unit. External AC power connections are made to the
unit inside the Power Box on the front of the unit. Remove the front panel to access the Power
Page 22 of 170
11/03/2016
CHAPTER 2 – INSTALLATION
NOTE
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
OMM-0119_0A
GF-130-I