Accel CS Boiler - Gas Heat - Eighth Edition – January, 2015 10
VENTING AND COMBUSTION AIR
Overview
The Accel CS boiler is a direct vented condensing boiler. Venting of the burnt flue gases requires approved flue piping
listed herein. Fresh air for combustion must be supplied to the boiler from outdoors using approved intake piping listed
below. The boiler cabinet doors must be in place and tightened during normal operation. When venting through the side of
a building, fresh air intake and flue gas venting must enter and exit on the same side of the building. When venting through
a chimney (where the chimney is used as a chase for a liner rated for positive pressure condensing operation), fresh air can
be piped alongside the liner inside the chimney chase or fresh air can also be taken from the basement.
The Accel CS boiler can be vented using the Energy Kinetics stainless steel sidewall vent system using Z-Vent III
stainless steel piping for the vent connections. The Energy Kinetics stainless steel sidewall vent system has been used for
many years to vent the System 2000 family of boilers and has a proven track record of operation.
The Accel CS boiler can also be vented using approved polypropylene venting systems such as manufactured by
Centrotherm and by DuraVent. The Accel CS boiler may not be vented using PVC, CPVC, or ABS piping.
BEST PRACTICE: Pipe the combustion Air Inlet directly to the outdoors, even if venting vertically through a liner inside a
chimney chase to avoid any of the contaminations often found in indoor air and to improve overall
efficiency of operation.
The installation of the flue vent and combustion air piping must comply with local codes and requirements and with the
National Fuel Gas Code NFPA 54, ANSI Z223.1 for installations in the USA or with CSA B149.1 or B149.2 for installations
in Canada
NOTICE: The Accel CS boiler requires a special venting system designed for pressurized venting rated ANSI Z21.13
Category 4. As such, the flue gas will condense in the flue and provision must be made to accommodate this.
DANGER: All flue piping must be tightly sealed as per the pipe manufacturer’s recommendation to insure against leakage
of noxious fumes, deadly carbon monoxide and/or condensate water.
WARNING: Sidewall venting (direct vent) requires outside air to be piped directly to the boiler.
WARNING: No solid fuel appliance or fireplace should be installed in a flue common with this heating appliance.
WARNING: You may use any of the vent and air piping options covered in this manual. Do not use any other method or
material when installing this appliance.
WARNING: Do not insulate the plastic flue pipes as excessive sagging of the plastic sections could result.
REMOVAL FROM COMMON VENT SYSTEM
DANGER: When any existing appliance, such as a boiler, is removed from a common venting system, the common
venting system is likely to be too large for proper venting of the appliances remaining connected to it. Testing
of the remaining venting system must be performed according to the following procedure.
At the time of removal of the existing appliance, the following steps shall be followed with each appliance remaining
connected to the common venting system placed in operation, while the other appliances remaining connected to the
common venting system are not in operation.
1. Seal any unused openings in the common venting system.
2. Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.
3. Insofar as is practical, close all building doors and windows, and all doors between the space in which the appliances
remaining connected to the common venting system are located and other spaces of the building. Turn on clothes
dryers and any appliance not connected to the common venting system. Turn on any exhaust fans, such as range
Model Firing Rate Range
EK1C
Standard 120,000 24,000 114,000 22,800
“Smart” Rate 90,000 18,000 85,500 17,100
EK2C
Standard 200,000 40,000 190,000 38,000
“Smart” Rate 150,000 30,000 142,500 28,500
EK3C
Standard 399,000 79,800 379,050 75,810
“Smart” Rate 300,000 60,000 285,000 57,000
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