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Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 2 – INSTALLATION
2.6 SUPPLY AND RETURN PIPING
2.6.1 BMK 750 – 1000 Supply and Return Piping
Benchmark 750 and 1000 Boiler utilizes 3" (7.62cm) 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 2-4a. Refer to Appendix A for dimensional data.
When connecting the hot water outlet and cold water inlet to building piping, first make sure the
mating surfaces are thoroughly clean. AERCO recommends using Loctite ® 7649 to prime the
mating surfaces and then Loctite 567 as pipe dope. Do NOT use Teflon tape.
EXHAUST
MANIFOLD
1/4" ANALYZER
NPT PORT
2.6.2 BMK 1500 – 3000 Supply and Return Piping
All Benchmark 1500, 2000, 2500 and 3000 units have one 4" (10.2 cm) 150# flanges for the
water INLET (supply) and one 4" (10.2 cm) 150# flanges for the hot water OUTLET (return)
piping connections. Refer to Appendix A for dimensional data.
When connecting the hot water outlet and cold water inlet to building piping, first make sure the
mating surfaces are thoroughly clean. AERCO recommends using Loctite ® 7649 to prime the
mating surfaces and then Loctite 567 as pipe dope. Do NOT use Teflon tape.
OMM-0121_D • GF-205 • 5/9/2019
Figure 2-4a: BMK 750/1000 Supply and Return Locations
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
3" HOT WATER OUTLET
(SUPPLY)
1" (2.54cm) NATURAL GAS INLET
AIR INLET
3" WATER INLET
DRAIN VALVE
CONDENSATE DRAIN
Page 21 of 122
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