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4. Installation
4.8 Connections for the air and flue pipes
4.8.1. General
The MCA Pro boiler is suitable for sealed combustion
air. The boiler vent collar is equipped with a 3" or 4"
adapter suitable for imperial size air and flue systems.
Sealed combustion terminals should comply with the
local and national codes. Any horizontal pipe-work in
the flue gas discharge system should slope towards the
boiler. Horizontal pipe-work in the air supply system
should slope towards the supply opening and may
require a drain point at the low point. Care should
be taken when locating flue exit positions as a vapor
plume will be visible when the boiler is operational
(Flue gas temperature may be less than 133ºF/56ºC
resulting in the water vapor condensing out on contact
with the air).
CAUTION
Always follow the Installation instructions supplied
with the venting system.
Vent pipe connection
The boiler vent collar is a double assembly 3" or 4"
PVC/CPVC Schedule 40 vent pipe (A).
i
Use a converting adapter to connect imperial
sized piping to the metric sized vent collar.
3"
4"
4.8.2. Flue gas venting
Use only Certified category II (Negative vent pressure)
and Category IV (Positive vent pressure), metallic
or non- metallic vent material. Plastic vent material
(CPVC/PVC/PP) can be used where local/national codes
allow.
Special vent connector adapters are required: Consult
the vent supplier or DDR Americas Inc. for assistance.
•
In Canada: Vent types must be an approved type
ULC S636 type BH non metallic or metallic vent
system.
•
In USA:ULC S636 and/or UL1738 approved
vent types (non metallic solid PVC, CPVC or
othe approved non metallic vent system), or an
approved stainless steel vent system.
This boiler is factory set for the use of UL1738 or
ULC-S636 approved PVC venting material. To protect
the venting system for too high flue temperatures this
boiler is equipped with a flue temperature sensor. This
sensor will limit the boiler to the maximum allowed flue
temperature of PVC, 65°C. If the boiler will be installed
34
MCA Pro 35/45
MCA Pro 65/90/115
MCA Pro 45/65/90/115
with other (higher qualified) venting material the flue
temperature limit parameter should be changed to
the maximum allowed flue temperature of the venting
material, see table:
Venting
Max. Material
allowable
temp allowable
°F
PVC
149
CPVC
194
PP
248
SS
600
WARNING
It's not allowed to use venting systems other than
ULC-S636 and/or UL1738 certified venting materials!
DANGER
When using either PVC, CPVC, Polypropylene or
stainless steel venting the components must be
certified according to ULC-S636 and or UL1738. Read
the Installer and Service Manual prior to installing.
Failure to follow the instructions in the manuals
could lead to death, serious personal injury and or
substantial product and or property damage.
A
3"/ 80 mm
4"/100 mm
Concentric adaptor is optional and not supplied with
boiler
B
Combustion
air supply
Combustion
air supply
Standard 2 pipe adaptor supplied with boiler suited for
imperial size certified PVC/CPVC flue systems.
Flue temp. Limit
parameter
°C
°F
65
149
65
90
194
90
120
230
110
315
230
110
Flue gas
outlet
Flue gas
outlet
MCA-Pro ISM Rv.4.1 2/2017
°C
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