Benchmark 750/1000 Boiler
Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
OMM-0082_0J
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
19
of
192
GF-130
Ph.: 800-526-0288
05/21/2014
In multiple unit installations, it is important to plan the position of each unit in advance. Sufficient
space for piping connections and future service/maintenance requirements must also be taken
into consideration. All piping must include ample provisions for expansion
.
If installing a Combination Control Panel (CCP) system, it is important to identify the
Combination Mode Boilers in advance and place them in the proper physical location. Refer to
Chapter 5 for information on Combination Mode Boilers.
2.5 SUPPLY AND RETURN PIPING
The Benchmark Boiler utilizes 3” 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. Refer to Appendix F, Drawing AP-A-891 for additional
dimensional data.
Figure2-3: Supply and Return Locations
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.
The relief piping must be full size, without reduction. No valves, restrictions, or other blockages
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.
BOILER HOT
WATER OUTLET
1” NATURAL GAS
OR PROPANE
INLET
SECONDARY INLET
AIR INLET
PRIMARY INTLET
DRAIN VALVE
EXHAUST MANIFOLD
