Supply And Return Piping; Bmk750 - 1000 Supply And Return Piping; Bmk1500 - 5000N Supply And Return Piping - Watts AERCO Benchmark OMM-0137 Installation And Start-Up Manual

Benchmark Platinum-Edge [ii]: Installation Manual
SECTION 2 – INSTALLATION

2.6 SUPPLY AND RETURN PIPING

When connecting the hot water outlet and cold-water inlet to building piping, first make sure the
mating surfaces are thoroughly clean. Gaskets of appropriate size for the pipe flange must be
provided in the field.
2.6.1 BMK750 – 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 2-5a.
LIFTING
BAR
(Must be
removed)
1/4" ANALYZER
NPT PORT
Figure 2-5a: BMK750/1000 Supply and Return Locations
2.6.2 BMK1500 – 5000N Supply and Return Piping
Benchmark 1500 – 3000 units have the following inlets and outlets:
•
4" (10.2 cm) 150# flange water INLET (supply) and hot water OUTLET (return) piping.
•
One of the following gas inlet pipes:
o 2" (5.08 cm) Natural Gas inlet pipe.
o 1" (2.54 cm) Propane inlet pipe (BMK 1500-2000).
o 2" (5.08 cm) Propane inlet pipe (BMK 2500-3000).
•
8" (20.3 cm) Air Inlet adapter.
Benchmark 4000 and 5000N units have:
•
6" (15.2 CM) 150# flange water INLET (supply) and hot water OUTLET (return) piping.
•
One of the following gas inlet pipes:
o 3" (7.62 cm) Natural Gas inlet pipe.
• GF-210 •
OMM-136_H
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
1/6/2021
3" HOT WATER OUTLET
(SUPPLY)
1" NATURAL GAS INLET (SINGLE-
FUEL AND DUAL-FUEL MODELS);
1" PROPANE INLET (SINGLE-FUEL
MODELS)
3/4" (1.91cm) PROPANE INLET
(DUAL-FUEL MODELS)
3" SECONDARY WATER INLET
WARMER WATER RETURN
AIR INLET
3" PRIMARY WATER INLET
COOLER WATER RETURN
DRAIN VALVE
CONDENSATE DRAIN
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