Installation & Operation Manual
13
TABLE - 1B
MINIMUM RECOMMENDED COMBUSTION
AIR SUPPLY TO EQUIPMENT ROOM
Model
Number
FIG. 1-3
FIG. 1-4
FIG. 1-5
FIG. 1-6
*Outside Air from
2 Openings Directly from
Outdoors
1
*Outside Air from
2 Ducts Delivered from
Outdoors
1
Inside Air from
2 Ducts Delivered from Interior Space
2
*Outside Air from
1 Opening Directly
from Outdoors, in
2
(cm
2
)
1
Same Story
Different
Stories
Top
Opening, in
2
(cm
2
)
Bottom
Opening, in
2
(cm
2
)
Top
Opening, in
2
(cm
2
)
Bottom
Opening, in
2
(cm
2
)
Top
Opening, in
2
(cm
2
)
Bottom
Opening, in
2
(cm
2
)
Total
Opening, in
2
(cm
2
)
2500
625
(4033)
625
(4033)
1250
(8065)
1250
(8065)
2500
(16129)
2500
(16129)
5000
(32258)
833
(5381)
3000
750
(4839)
750
(4839)
1500
(9678)
1500
(9678)
3000
(19355)
3000
(19355)
6000
(38710)
1000
(6452)
3500
875
(5646)
875
(5646)
1750
(11291)
1750
(11291)
3500
(22581)
3500
(22581)
7000
(45162)
1167
(7530)
4000
1000
(6450)
1000
(6450)
2000
(12900)
2000
(12900)
4000
(25800)
4000
(25800)
8000
(51600)
1333
(8600)
5000
1250
(8062)
1250
(8062)
2500
(16129)
2500
(16129)
5000
(32250)
5000
(32250)
10000
(64500)
1667
(10750)
1
Determine boiler location
(continued)
The above requirements are for the
appliance only
; additional gas fired appliances in the equipment room will require an increase
in the net free area and/or volume to supply adequate combustion air for all appliances.
No combustion air openings are needed when the appliance is installed in a space with a volume NO LESS than 50 cubic feet per
1,000 Btu/hr of all installed gas fired appliances.
Buildings MUST NOT be of *“Tight Construction”
3
.
1
Outside air openings shall directly communicate with the outdoors.
2
Combined interior space must be 50 cubic feet per 1,000 Btu/hr input.
Buildings MUST NOT be of *“Tight Construction”.
3
”Tight Construction”
is defined as a building with less than 0.40 ACH (air changes per hour). For buildings of
“Tight
Construction”
, provide air openings into the building from outside.
DIR #2000529297 00
AIR FILTERS
LIFT AND SLIDE OUT BOTH
FILTER COVER PLATES
TO GAIN ACCESS TO
THE AIR FILTERS
Figure 1-8_Filter Access
Combustion air filter
This unit has two (2) standard air filters located at the combustion
air inlet as shown above in FIG. 1-8. These air filters are
provided to help ensure clean air is used for the combustion
process. Check filters every month and replace when necessary.
The filter size for Models 2.5 - 3.5 is 20” x 14” x 1” (50.8 cm x
35.5 cm x 2.5 cm) and for Models 4.0 - 5.0 it is 25” x 16” x 1”
(63.5 cm x 40.6 cm x 2.5 cm). You can find these commercially
available filters at any home center or HVAC supply store.
Follow the steps below when replacing the
combustion air filter:
1. Locate the combustion air filter box mounted
on the rear of the appliance.
2. Remove four (4) #10 hex head fasteners from
the filter cover plates (see FIG. 1-8).
3. Lift and slide out both filter cover plates to gain
access to the air filters.
4. Slide each air filter out the back slot openings
of the air filter box.
5. Inspect the air filters for dirt and debris, replace
if
necessary.
6. Replace the air filters and the filter box cover
plates. Replace the four (4) #10 hex head
fasteners to secure the filter cover plates to the
air filter box.
Replace filters with a MERV rating no greater
than 4.0.
NOTICE
CAUTION
During construction the air filter should be
checked more frequently to ensure it does
not become clogged with combustion dirt
and debris.
NOTICE
Sustained operation of an appliance with
a clogged burner may result in nuisance
operational problems, bad combustion, and
non-warrantable component failures.
