Instruction manual

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All Air From Outside The Building
When installed in a con ned space without utilizing the intake
air option two permanent openings communicating directly with,
or by ducts to, the outdoors or spaces that freely communicate with
the outdoors must be present.  e upper opening must be within 12
in, 305 mm of, but not less than 3 in, 76 mm from, the top of the
enclosure.  e bo om opening must be within 12 in, 305 mm of,
but not less than 3 in, 76 mm from, the bo om of the enclosure.
Where directly communicating with the outdoors or communicating
with the outdoors through vertical ducts, each opening shall have a
minimum free area of 1 in
2
/4000 Btu/hr, 550 mm
2
/kW of the
total input rating of all of the equipment in the enclosure.
Where communicating with the outdoors through horizontal
ducts, each opening shall have a minimum free area of 1 in
2
/2000
Btu/hr, 1100 mm
2
/kW of the total input rating of all of the
equipment in the enclosure. When louvers and screens are used, they
must have the same cross-sectional area as the free area of the
opening to which they connect.
When calculating the free area necessary to meet the make-up air
requirements of the enclosure,consideration must be given to the
blockage e ects of louvers, grills and screens. Screens must have a
minimum mesh size of 1/4 in, 6.4mm. If the free area through a
louver or grill is not known, ducts should be sized per Table 3.
Table 3 Make-up air louver sizing
Required Cross Sectional Area
Input
(MBH)
1/4 in 6.4 mm
Wire Screen
75% Free Area
Metal Louvers
25% Free Area
Wooden Louvers
in
2
cm
2
in
2
cm
2
in
2
cm
2
225 57 363 75 484 225 1452
300 75 484 100 645 300 1935
399 100 645 133 858 399 2573
600 150 968 200 1290 600 3870
750 190 1210 250 1613 750 4840
1050 263 1696 350 2258 1050 6773
1200 300 1936 400 2580 1200 7740
1480 370 2388 494 3182 1480 9546
1650 413 2662 550 3548 1650 10,643
1970 493 3179 657 4236 1970 12,707
2300 575 3711 767 4945 2300 14,835
Canadian installations must comply with CSA B149.1 when air
supply is provided by natural air  ow from the outdoors for natural
dra , partial fan-assisted, fan-assisted, or power dra -assisted
burners, there shall be a permanent air supply opening(s) having
a cross-sectional area of not less than 1 in
2
per 7,000 Btuh
(310 mm
2
per kW) up to and including 1 million Btuh, plus
1 in
2
per 14,000 Btuh (155 mm
2
per kW) in excess of 1
million Btuh.
Intake Air Option - General Guidelines
 is con guration provides combustion air directly to the boiler/
water heater’s air intake using a dedicated pipe to obtain combustion
air from the outdoors. Combustion air can be drawn in horizontally
through an outside wall or vertically through the roof, see Figures
4, 5, 6 & 7.
Common intake air systems may be used to provide
the common duct is sized properly and an intake
combustion air damper is installed in the intake air
pipe of each heater. Improper installation can result in
excessive levels of carbon monoxide which can cause
severe personal injury or death!
Single wall galvanized smoke pipe, single wall aluminum pipe or
 exible aluminum pipe can be used for the in-take air pipe. It must
be sized per Table 4. All joints in metal combustion air systems
must be secured using corrosion resistant fasteners and sealed using
a suitable Silicon caulk or tape.  e combustion air system
MUST be supported by the building structure not the
boiler/water heater.
Table 4 Combustion air pipe sizing
Model Size
Pipe Diameter
in mm
225 - 300 5 127
400 6 152
600 - 750 8 203
1050 10 254
1200 - 2300 12 305
A combustion air damper interlocked with the unit
should be installed in the intake air pipe when the
in ltration of sub-freezing air could occur, otherwise
the unit could freeze up voiding the warranty!
Intake Air Option - Horizontal Guidelines
 e maximum equivalent length for the horizontal combustion
air pipe on installations that used the Direct Vent option is 35  ,
10.8 m.  e maximum equivalent length for the horizontal
combustion air pipe on installations that use the Horizontal Vent
option is 100  , 30.5 m. Each 90° elbow and the combustion air
terminal are equal to 10 linear  , 3.0 m of pipe. If horizontal runs
exceed 5  , 1.5 m they must be supported at 3  , 0.9 m intervals
with overhead hangers.  e certi ed combustion air terminal from
RBI must be used and installed as shown in Figures 4 and 5.
Intake Air Option - Vertical Guidelines
 e maximum length for the vertical combustion air pipe is 30  ,
9.1 m plus two 90° elbows. A listed, nonrestrictive combustion air
cap must be used.  e combustion air cap must terminate as shown
in Figure 6.  e penetration point in the roof must be properly
 ashed and sealed.