Specifications

Page 20 of 40 12/03/2013
Benchmark Series Boilers
Venting and Combustion Application Guide
GF-2050
TAG-0022_0S
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Figure 9b: Vent Starter Section – Left Side View
BMK 2500 & BMK 3000 (Left) & BMK 6000 (Right)
1.20 Condensate Removal
The exhaust vent system must be pitched back toward the Benchmark unit by a minimum of
¼-inch per foot of duct length to enable condensate to drain back to the unit for disposal. Low
spots in the vent must be avoided to prevent the condensate from collecting.
The condensate trap assembly is located directly below the exhaust manifold. Plastic hose
should be connected to the trap assembly and run to drain. Care should be taken to avoid hose
kinks and to avoid raising the hose above the trap assembly. Condensate should flow freely to
drain. The condensate-to-drain run must not be hard-piped so the trap can be removed
periodically for maintenance purposes.
If the condensate must be lifted above the trap assembly to a drain, it should be drained into a
sump. From there, a pump can lift the condensate away.
Each unit will produce the following approximate condensate quantities in the full condensing
mode:
• BMK 750 = 6 gallons per hour
• BMK 1000 = 8 gallons per hour
• BMK 1500 = 9 gallons per hour
• BMK 2000 = 10 gallons per hour
• BMK 2500 = 15 gallons per hour
• BMK 3000 = 20 gallons per hour
• BMK 6000 = 40 gallons per hour
Condensate drain systems must be sized for full condensing mode.
In multiple boiler applications, it is common to manifold these drains together in a plastic pipe
VENT
STARTER
SECTION
VENT
STARTER
SECTION
EXHAUST MANIFOLD
EXHAUST MANIFOLD
ANALYZER
PROBE PORT
ANALYZER
PROBE PORT
CONDENSATE
DRAIN
CONDENSATE
DRAIN
BOILER BODY
BOILER BODY
MIN. 24”
STRAIGHT
VENT
STARTER
MIN. 24”
STRAIGHT
VENT
STARTER