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2.5 SUPPLY AND RETURN PIPING
The Benchmark Boiler utilizes 4" 150# flanges for the water system supply and return piping
connections. The physical location of the supply and return piping connections are on the rear of
the unit as shown in Figure 2-3.
2" GAS INLET
BOILER HOT
WATER OUTLET
(SUPPLY)
AIR INLET
PRIMARY
WATER INLET
(RETURN)
EXHAUST
MANIFOLD
CONDENSATE
DRAIN PORT
2.6 PRESSURE RELIEF VALVE INSTALLATION
An ASME rated Pressure Relief Valve is supplied with each Benchmark Boiler. The pressure
rating for the relief valve must be specified on the sales order. Available pressure ratings range
from 30 psi to 160 psi. The relief valve is installed on the hot water outlet of the boiler as shown
in Figure 2-4. A suitable pipe joint compound should be used on the threaded connections. Any
excess should be wiped off to avoid getting any joint compound into the valve body. The relief
valve must be piped to within 12 inches of the floor to prevent injury in the event of a discharge.
are allowed in the discharge line. In multiple unit installations the discharge lines must not be
manifolded together. Each must be individually run to a suitable discharge location.
OMM-0097_0C
GF-142
Benchmark 1500 - 2000 Boilers
CHAPTER 2 – INSTALLATION
Figure 2-3: Supply and Return Locations
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
DRAIN VALVE
Page 19 of 184
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