10
Removing Motor and Blower Wheel
1. Shut off power to the unit.
2. Open transformer.
3. Remove motor wire.
4. Remove 2, 3/8" screws.
5. Remove motor and blower wheel.
6. Loosen 1/8" Allen screw and remove wheel. The wheel
will be down 3/4" on the shaft.
7. To replace, reverse steps 1-6. (See Figure 9, page 6
and Figure 16, page 7)
Installation Instructions CB-200A Base
The model CB-200A (901696) base allows for a non-sealed
combustion, central heating (without warm air ducts) instal-
lation of the CMF Series furnaces. This installation must be
done by a qualified installing agency in accordance with
local codes and ordinances.
Location
Allow clearance from adjacent materials as stated under
“Minimum Clearances.” Ample clearance should be pro-
vided to permit easy access for removal of filters, blower,
motors, controls and vent connections. Unit must be
installed in a level position on NORDYNE base model
CB-200A.
Minimum Clearances To Adjacent Materials
The furnace may be installed in a corner, or against an open
wall with the clearances not less than: Front 36 inches; Top
17 inches; Vent 9* inches for oil units, 6 inches for gas units;
3* inches for rear; and 2** inches for one side if in corner.
* Rear clearance may be 0 inches but vent clearance will be
reduced to 6 inches. Refer to table 8, appendix B of NFBA
No. 31 for requirements to achieve 6 inches vent clearance.
** The minimum clearance from warm air register in base
must be 36 inches. Use a 15 5/8" L x 7" W sheet metal blank
off panel to replace register when clearance is less than 36
inches.
Venting (CB-200A Base)
Unit must be vented through a permanent chimney or 4"
type L, low temperature venting system (oil units) or 4" type
BW venting system (gas units) selected and installed by the
installer. Check chimney for soot, leaks, obstructions and
proper height. If it is necessary to construct a new chimney,
local conditions such as necessary height, draft, and num-
ber of appliances served should be checked with local
building codes.
Horizontal distances to an existing chimney should be as
short as possible and the connecting pipe should slope
upward to the chimney at not less than a 45° angle. Total
length of the sloping pipe must not exceed 6 feet.
Barometric regulator (oil units)* is to be installed at the vent
connection of the furnace. All flue pipe joints should be
fastened with sheet metal screws for rigidity.
To prevent down-draft, the chimney should extend at least
2' above the peak of roof. The internal area of the chimney
should equal the area of the flue outlet on the furnace. The
chimney should have no obstructions or sharp bends where
soot and other foreign matter can accumulate. If inspection
shows it to be obstructed, the chimney should be cleaned.
The existing flue pipe should be cleaned or a new pipe
should be installed. Connect the flue pipe to the chimney with
few elbows as possible. Do not install hand dampers of any
type.
It is desirable that the furnace flue serves no other appli-
ances. However, when two or more appliances must vent
into a common flue, the area of the common flue should at
least equal the area of the largest flue connector, plus 50%
of the area of the additional flue and vent connectors. The
flue or vent connector must be inserted into, but not beyond,
the inside wall of the chimney flue liner.
Provisions must be made for adequate ventilation to prop-
erly support combustion and to maintain safe ambient tem-
peratures.
When buildings are so tight that normal infiltration does not
meet air requirements, one or more permanent openings
must be provided to supply outside air. The minimum cross
section of the duct is to be 1 sq. inch area-free for each 2000
Btuh input for horizontal duct installations, or 4000 Btuh input
for vertical installations. Refer to gas code book.
Installation
Base:
The base must be located on a hard surface. When
the furnace location is carpeted, use a hard surface platform
under the base.
Furnace:
Set the furnace on the base without damaging the
foam gasket material on the base top. Making sure the
furnace is seated on the back of the base, fasten the front of
the furnace to the base with 1/2" long sheet metal screws.
NOTE:
Front register is not adjustable and remains fully
open.
Fuel line piping, wiring, and thermostat: Refer to the instal-
lation and operation manuals provided with the furnace.
DANGER:
When using CB-200 A (Cottage Base), do not
install the furnace in a mobile home. Do not install the
furnace in a closet, alcove or other enclosed area.
Violation of the above may cause incomplete combus-
tion which may produce poisonous gases causing as-
phyxiation and resulting in sickness or death.
