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All installations and services must be performed by qualified service personnel.
6
2. The BTU output capacity of the furnace proposed for installation should be based on a heat loss calculation
made according to the manuals provided by the Air Conditioning Contractors of America (ACCA) or ASHRAE.
3. MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
TABLE 1
MODEL NO.
FROM SIDES OF
FURNACE & REAR
FRONT
TOP OF
PLENUM
FROM THE
FLUE OR VENT
SIDE OF
PLENUM
CHB1-50
0 IN.
6 IN.
0 IN.
0 IN.
1 IN.
CHB1-75
0 IN.
6 IN.
0 IN.
0 IN.
1 IN.
CHB1-100
0 IN.
6 IN.
0 IN.
0 IN.
1 IN.
CHB1-125
0 IN.
6 IN.
0 IN.
0 IN.
1 IN.
CDB1-50
0 IN.
6 IN.
0 IN.
0 IN.
1 IN.
CDB1-75
0 IN.
6 IN.
0 IN.
0 IN.
1 IN.
CDB1-100
0 IN.
6 IN.
0 IN.
0 IN.
1 IN.
CDB1-125
0 IN.
6 IN.
0 IN.
0 IN.
1 IN.
The CHB1-50, 75, 100 and 125 furnaces may be installed on combustible flooring. The furnace shall not be installed
directly on carpeting, tile or other combustible material other than wood flooring.
The CDB1-50, 75, 100 and 125 furnaces are to be installed on non-combustible flooring only. The non-combustible
floor bases model no. 50 DA base for CDB1- (50,75) model no. 100 CA base for the model no. CDB1-100 and
model no. 125 CA base for CDB1-125 are available for the counterflow furnaces to allow their installations on
combustible flooring.
These furnaces may be installed in an alcove or in a closet if the minimum clearances to combustible construction
(listed previously) are met. The CDB1 series furnaces may be installed in an attic or crawl space. Refer to section III,
B1 of this installation manual.
The minimum clearances are listed for fire protection. Clearance for servicing the front of the furnaces and to all
points on the furnace requiring access must be 24”*.
*For horizontal furnace installation, refer to section III, B1 of this installation manual.
Equipment must be installed in accordance with regulations of the National Board of Fire Underwriters.
Authorities having jurisdiction should be consulted before installations are made.
B. FURNACE LOCATION
: These high efficiency condensing furnaces are not certified for and shall not be vented into a
standard or any type of chimney.
The following shall be considered for locating the furnace:
1. For best performance locate the furnace so that it is centralized with respect to the duct system and as near as
possible to a floor drain since condensate drainage must be provided.
2. Place the unit so that proper venting can be achieved, with a minimum number of elbows, in accord with the
instructions in this manual.
3. The furnace must be located on a level, dry surface. The furnace must be installed so that the electrical
components are protected from water. If the area becomes wet or damp at times, the
furnace should be raised
above the floor using a concrete base, bricks, patio blocks, etc.
NOTICE: Ensure furnace is level after installation to ensure proper drainage and operation.