Gas Supply Piping; Gas Supply Specifications; Manual Gas Shutoff Valve - Watts Aerco BENCHMARK 750 User Manual

Benchmark 750 – 1000 Boiler User Manual - INTERNATIONAL

2.8 GAS SUPPLY PIPING

The AERCO Benchmark Gas Components and Supply Design Guide, GF-2035 must be
consulted prior to designing or installing any gas supply piping.
NEVER USE MATCHES, CANDLES, FLAMES OR OTHER
SOURCES OF IGNITION TO CHECK FOR GAS LEAKS
Many of the soaps used for gas pipe leak testing are corrosive to
metals. Therefore, piping must be rinsed thoroughly with clean
water after leak checks have been completed.
All gas piping must be arranged so that it does not interfere with
removal of any covers, inhibit service/maintenance, or restrict
access between the unit and walls, or another unit.
Benchmark 750 and 1000 units contain a 1 inch (2.54 cm) NATURAL GAS inlet connection on
the back of the unit, as shown in Figure 2-2 and 2-3.
Prior to installation, all pipes should be de-burred and internally cleared of any scale, metal
chips or other foreign particles. Do NOT install any flexible connectors or unapproved gas
fittings. Piping must be supported from the floor, ceiling or walls only and must not be supported
by the unit.
A suitable piping compound, approved for use with natural gas, should be used. Any excess
must be wiped off to prevent clogging of components.
To avoid unit damage when pressure testing gas piping, the unit must be isolated from the gas
supply piping. The gas pressure applied to the unit must never exceed 14" W.C. (3.49 kPa). A
thorough leak test of all external piping must be performed using a soap and water solution or
suitable equivalent. The gas piping used must meet all applicable codes.

2.8.1 Gas Supply Specifications

The gas supply input specifications to the unit for Natural Gas are as follows:
•
The maximum static pressure to the unit must not exceed 14" W.C. (3.49 kPa)
•
Supply piping and pressure to the unit must be sufficient to provide the following volume
of gas while maintaining a gas pressure of 4" W.C. (1.00 kPa) while operating at
maximum capacity:
o BMK 750: 728 CFH (20.6 m
o BMK 1000: 976 CFH (27.6 m

2.8.2 Manual Gas Shutoff Valve

A manual shut-off valve must be installed in the gas supply line upstream of the Heating Boiler
as shown in Figure 2-7. Maximum allowable gas pressure to the Heating Boiler is 14" W.C.
(3.49 kPa).
OMM-0119_0A
GF-130-I
CHAPTER 2 – INSTALLATION
--WARNING! -
--CAUTION -
NOTE
3
/hr).
3
/hr)
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
.
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11/03/2016