Flue Gas Vent Installation; Massachusetts Installations - Watts AERCO Benchmark BMK750 Installation And Start-Up Manual

Benchmark 750-6000 with Edge [i]: Install-Startup Manual
SECTION 2 – INSTALLATION

2.12 FLUE GAS VENT INSTALLATION

AERCO's Benchmark Venting and Combustion Air Design Guide, TAG-0022 (GF-2050) must
be consulted before any flue or combustion air venting is designed or installed. Suitable, U/L
approved, positive pressure, watertight vent materials MUST be used for safety and UL
certification.
Once you have selected the vent material, enter that material in the Edge Controller:
Main Menu → Advanced Setup → Unit → Unit
1. Go to:
2. Find the Vent Type parameter.
3. Set the value of this parameter to match your vent material: PVC, cPVC, Polypro or
Stainless Steel; the material sets the exhaust temperature limits. Note, PVC and cPVC are
allowed for BMK750 and 1000 ONLY, and only where governing codes allow.
Because the unit is capable of discharging low temperature exhaust gases, the flue must be
pitched back towards the unit a minimum of 1/4" per foot (0.64 cm per 0.3 m) to avoid any
condensate pooling and to allow for proper drainage.
While there is a positive flue pressure during operation, the combined pressure drop of vent and
combustion air systems must not exceed 140 equivalent feet (42.7m) or 0.8" W.C. (199 Pa).
Fittings as well as pipe lengths must be calculated as part of the equivalent length. For a natural
draft installation the draft must not exceed -0.25" W.C. (-62 Pa). These factors must be
planned into the vent installation. If the maximum allowable equivalent lengths of piping are
exceeded, the unit will not operate properly or reliably.

2.12.1 MASSACHUSETTS INSTALLATIONS

For Massachusetts installations, the following companies provide vent systems which conform to
all applicable requirements for installations within the Commonwealth of Massachusetts. Contact
information is as follows:
Selkirk Corporation - Heatfab Division
130 Industrial Blvd.
Turners Falls, MA 01376
Phone: 1-800-772-0739
www.heatfab.com
Glover Sheet Metal, Inc.
44 Riverdale Ave.
Newton, MA 02485
Phone: (617) 527-8178
www.gloversheetmetal.com
OMM-144_B • GF-217 •
5/25/2020
Watertown Supply
33 Grove St.
Watertown, MA 02472
Phone: (617) 924-2840
www.watertownsupply.com
Emerson Swan Co
Engineering Products Department
300 Pond St.
Randolph, MA 02368
Phone 781-986-2555
Fax 781-986-2027
www.emersonswan.com
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
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