43
MCA
Pro
45/65/90/115
MCA-Pro ISM Rv.4.1 2/2017
Combustion air supply requirements
The boiler must be provided with an adequate combustion
air supply, the combustion air supply requirements must
be determined and sized in accordance to national and
local codes having jurisdiction.
CSA B148 & ANSI Z223.1 - More than one combustion air
source may be required. Combustion air inlet vent must
terminate with either an approved termination or a 90º
elbow and must be provided with a debris/bird-rodent
screen.
CAUTION
The boiler requires a clean, fresh and adequate
supply of combustion air. Failure to provide sufficient
combustion air supply will result in carbon monoxide
(CO) production that could lead to personal injury
including loss of life or damage to boiler or property.
Do not store any flammable liquids, fluids, vapors or
materials near the vicinity of the boiler.
Special attention
• Quality of combustion air
• Dust, fumes, corrosive elements, hydrocarbons,
other unknown containments
• Paint, beauty, automotive, shops
Air supply structure
The air supply pipe must be airtight. Horizontal sections
in the air supply must slope away from the boiler
towards the supply opening and incorporate a drain
connection if the route rises from a lower point. It is
necessary to provide an easily removable air vent for
maintenance reasons.
Combustion air vent materials
Use metallic (aluminum or stainless steel) and non metallic
types of materials that comply with the construction
requirements of UL 181 or ULC S-110, Class 1.
WARNING
The boiler should never be operated in a negative
building pressure. Caution should be exercised with
exhaust fans, air handling and other devices, that
could affect the buildings air pressure or combustion
air supply. All venting must be arranged to avoid and
prevent the accumulationof flue gas condensation.
WARNING
An improperly sealed venting system could result in
carbon monoxide poisoning; ensure adequate support
and fastening of the system. Ensure venting can
safely exhaust all flue gases to the outside in a safe
and effective manner. Do not puncture or drill holes
in any portion of the venting, the boiler is equipped
with a pressure and emission test port.
Co-venting - Retrofitting
WARNING
• This boiler must not be co-vented with a category
I or III appliance.
• Do not co-vent the boiler, when venting the
boiler either direct vent (sidewall) or in sealed
combustion venting application.
At the time of removal of any existing boiler from a
common vent system, the following steps shall be
performed with each remaining appliance connected
to the common vent in operation and not in operation.
The boiler must have a vent damper installed when
coventing with other appliances.
a.
Any used opening of the vent system be properly
sealed.
b.
Visually inspect the venting system for proper
size and horizontal pitch. Determine there is no
blockage, restriction, leakage, corrosion and other
deficiencies that could cause an unsafe condition.
c.
Close all building doors, windows and all doors
between the appliances which remain connected
to the common venting system and other space of
the building. Turn on clothes dryers, exhaust fan at
maximum speed and any appliance not connected
to the common vent system, close fireplace
dampers. Do not operate a summer exhaust fan.
d.
Place in operation each of the appliances installed
in the common vent system being inspected. Follow
the lighting instructions. Adjust thermostat so
appliance will operate continuously.
e.
Test for spillage near and around each of the
gas appliances after 5 minutes of main burner
operation.
f.
After determining that each appliance remains
connected to the common venting system properly
vents when tested as outlined above, return all
doors, windows, exhaust fan, fireplace dampers
and any other gas burning appliance to their
normal positions.
g.
Any improper operating of the venting system must
be corrected so the installation conforms to both
ANSI Z223.1/NFPA 54 or CAN/ CSA B149.1 gas
installation codes. When resizing any portion of
the common venting system, the common venting
system shall be resized to approach the minimum
size as determined using the appropriate tables
in Part II of ANSI Z223.1/NFPA 54 gas code and/
or CAN/CSA B149.1 natural gas and propane
installation code.
4. Installation
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