Flue Gas Vent Installation; Exhaust Starter Kit And Stack Guard Sensor - Watts AERCO CFR 3000 Installation And Start-Up Manual

SECTION 2: INSTALLATION

2.11 Flue Gas Vent Installation

The CFR gas-fired boiler is a fan-assisted, hydronic-heating unit with the following venting capabilities:
1. Room Combustion Air, Vertical Discharge
2. Ducted Combustion Air, Vertical Discharge
It is critical that the flue gas vent be designed to prevent condensation in the flue gas vent for safe
operation. Condensation can occur in the CFR boiler, so each unit is fitted with a condensate removal trap
(see Section 2.7). However, with its advanced technology, the CFR boiler always delivers dry flue gas for
safe exhaust into Category I venting. A stack guard sensor is supplied with each boiler.
The CFR Boiler is a Category I listed appliance and must be vented with Type B gas vent or approved metal
pipe/masonry chimney. Exterior Masonry Chimneys, defined as masonry chimneys exposed to the
outdoors on one or more sides below the roof line, cannot be used due to high flue heat loss which can
affect the draft produced. When venting into interior masonry chimneys, refer and adhere to the latest
publication of NFPA54 for chimney lining material, sizing, and termination requirements. When using an
existing chimney, it must be approved for Cat I appliance, and inspected/cleaned to ensure it is structurally
sound and free of blockage for proper operation. If the condition of the existing chimney is deemed
unsuitable it must be relined, repaired, or replaced to comply with the latest publication of NFPA54.
Once you have selected the vent material, enter that material in the Edge Controller:
Advanced Setup → Unit → Unit
1. Go to:
2. Set this parameter to match your vent material: Category I; this sets the exhaust temp limits.
Horizontal vent runs slope upwards towards the direction of flue gas path at a minimum of ¼" per foot.
The exhaust system shall be sized in accordance with the latest publication of the National Fuel Gas Code
(ANSI Z223.1/ NFPA54) as a fan-assisted Category I appliance.
For individually vented units, the exhaust system must be designed so that the pressure measured at
every point is negative, within the range of -0.01 to -0.08" w.c.
For common vented units, the exhaust system must be designed so that the pressure measured at every
point is negative, within the range of -0.01 to -0.08" w.c.
Please consult the CFR Venting and Combustion Air Design Guide, TAG-0105 for additional vent and
combustion air installation details.
2.11.1 Exhaust Starter Piece, Vent Increaser, and Stack Guard Sensor
A vent starter section (P/N 99324) and a vent increaser is provided by AERCO to be field installed (see
Figure 2-13) based on the individual vent or connector size selected for the venting layout:
1. 8" x 10" vent increaser (P/N 99325-10): Use this when Category I vent sizing from NFPA54 tables
require the following individual vent or connection size: 9", 10", 12" and 14".
2. 8" x 18" vent increaser (P/N 99325-10): Use this when Category I vent sizing from NFPA54 tables
require the following individual vent or connection size: 16", 18", 20" and 22".
IMPORTANT: For retrofit applications, replacing a system with the same total BTU capacity does not
necessarily mean the existing vent size will work. Size the vent in accordance with NFPA54 as a fan-assisted
Category I appliance to determine the correct size.
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Settings. Find the Vent Type parameter.
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