Part 2 Venting; General Venting Guide; Category I And Category Ill Venting - Camus Hydronics DynaFlame DFW501 Installation, Operation And Service Manual

PART 2 VENTING
It is extremely important to follow these venting
instructions carefully. Failure to do so can cause
severe personal injury, death or substantial property
damage.
Foam Core Pipe, PVC, CPVC are not to be used in any
part of the venting system.
2.1

GENERAL VENTING GUIDE

Figure 5: Venting Configurations
The DynaFlame is a category I, 85% efficient unit, supplied
as a non-condensing appliance.
•
When supplied with the Condenser Heat Recovery
Module (CHRM).The DynaFlame is 95% efficient and
is considered to be a category II appliance.
•
Vent installations for connection to gas vents or
chimneys must be in accordance with Part 7, "Venting
of Equipment," of the latest edition of the National Fuel
Gas Code, ANSI Z223.1, in Canada, the latest edition
of CAN/CGA Standard B149 Installation Codes for Gas
Burning Appliances and Equipment or applicable
provisions of the local building codes.
•
The distance of the vent terminal from adjacent
buildings, windows that open and building openings
MUST comply with the latest edition of the National
Fuel Gas Code, ANSI Z223.1, in Canada, the latest
edition of CAN/CGA Standard B149 Installation Code
for Gas Burning Appliances and Equipment.
•
Vent connection is made directly to the flue outlet
opening on the back of the unit. The connection from
the appliance vent to the stack must be made as direct
as possible.
•
Appliances for outdoor installation are intended to vent
using a listed vent cap. For indoor installations venting
must be in accordance with Part 7, Venting of
Equipment, of the National Fuel Gas Code, ANSI
Z223.1, or Section 7, Venting of Equipment and Air
Supply for Appliances, of the CAN/CGA B149,
Installation Codes, or applicable provisions of the local
building codes.
•
Vent connectors serving appliances vented by natural
draft shall not be connected into any portion of
mechanical draft systems operating under positive
pressure.
•
Horizontal runs of vent pipe shall be securely
supported (approximately every 4 feet) to prevent
sagging and maintain a minimum upward slope of ¼"
per foot from the appliance to the vent terminal.
•
The weight of the venting system must not rest on the
unit. Adequate support of the venting system must be
provided in compliance with local codes and other
applicable codes.
•
All connections should be secured and sealed per the
vent manufacturers specifications. When a Positive
vent system is disconnected for any reason, the flue
must be reassembled and resealed according to the
vent manufacturer's instructions.
•
Do not use an existing chimney as a raceway if
another appliance or fireplace is vented through the
chimney.
2.1.1

CATEGORY I AND CATEGORY Ill VENTING

A Category I or Ill venting system for the flue products is
required on all non-condensing models (DynaFlame without
CHRM). A Category I venting system operates with a
negative pressure in the vent. The Category Ill venting
system operates with positive pressure generated by the
internal combustion air fan.
•
The Category I flues from multiple appliances can be
combined into a common vent using recommendations
from published venting tables.
•
Controls of single or multiple Category I appliances
may subject appliances to low fire operation for long
periods depending on control strategies being used.
Under this condition the venting does not reach the
temperatures required for evaporation of flue gas
condensation generated from initial start-up. To
prevent nuisance condensation, avoid this operating
condition or use corrosion resistant stainless steel
venting.
•
The Category Ill flues from multiple appliances CAN
NOT be combined into a common vent.
•
The Category Ill flue must be a dedicated stack.
•
The Category Ill Flue appliance must have all vent
joints and seams gas-tight. Unless a special venting
system made from AL29-4C or equivalent is used
which has integral seals, all vent connector seams and
joints must be sealed with pressure sensitive
aluminium tape or silicone sealant as specified by the
vent manufacturer. Aluminium tape must meet the
provisions of SMACNA AFTS -100-73 Standard.
•
The flue products in a category III vent system may be
cooled below their dew point and form condensate in
the flue. Corrosion resistant stainless steel must be
used for the venting.
•
When venting category III appliance thru unheated
spaces insulation should be wrapped around single
wall vent pipe to minimize the possibility of flue gas
condensation inside the vent unless AL29-4C or
equivalent special venting is used. The authorities
have jurisdiction must approve venting prior to
insulating.
•
The flue from a Category IIl vent system must have
provisions to properly collect and dispose of any
condensate that may occur in the venting system.
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