11
Proper air flow is required for the correct operation of this
furnace . Restricted air flow can cause erratic operation
and can damage the heat exchanger . The duct system
must carry the correct amount of air for heating and cool-
ing if summer air conditioning is used .
IMPORTANT:
When using outside air, design and adjust
the system to maintain a return air temperature ABOVE
55° F during the heating season .
NOTE: Return air grilles and warm air registers must not
be obstructed or closed .
UPFLOW INSTALLATIONS
1 . Position the unit to minimize long runs of duct or runs
of duct with many turns and elbows .
2 . For side return: Cut an opening in the side . The
opening should be cut the full width and height of the
knockouts on the unit . See Figure 6 .
3 . If summer air conditioning is desired, position the
indoor coil on the supply-air side of the unit . Ensure
that no air can bypass the coil .
4 . Connect the furnace to the supply air plenum . See
Figure 7 .
5 . Connect the return air ducting to the return-air open-
ing at the bottom and/or side of the unit . Make the
connections air-tight to prevent the migration of toxic
fumes and odors including carbon monoxide from mi-
grating into the living space .
6 . If a filter is installed near the furnace, be sure to have
adequate space for installation and removal of the
unit filter .
7 . NOTE: Where the maximum airflow is 1800 CFM or
more, BOTH sides or the bottom must be used for the
return air . Do not take return air from the back of the
unit .
NOTE: DO NOT take return air from furnace rooms, ga-
rages or cold areas . Avoid return air from utility rooms,
kitchens, laundry rooms and bathrooms .
DUCTING
Ducting
WARNING
BLOWER AND BURNERS MUST NEVER BE OPERATED
WITHOUT THE BLOWER DOOR IN PLACE . THIS IS TO
PREVENT DRAWING GAS FUMES (WHICH COULD CON-
TAIN HAZARDOUS CARBON MONOXIDE) INTO THE
HOME THAT COULD RESULT IN PERSONAL INJURY OR
DEATH .
WARNING
THE SOLID METAL BASE PLATE MUST BE IN-
STALLED IN THE FURNACE BOTTOM WHEN USING
SIDE AIR RETURN . FAILURE TO INSTALL A BASE
PLATE COULD CAUSE THE PRODUCTS OF COM-
BUSTION TO CIRCULATE INTO THE LIVING SPACE
AND CREATE POTENTIAL LY HAZARDOUS CONDI-
TIONS, INCLUDING CARBON MONOXIDE POISON-
ING OR DEATH . FOR BOTTOM RETURN, A SOLID
METAL BASE PAN MUST NOT BE INSTALLED . SEE
FIGURE 5 .
!
WARNING
SOME HEATING AIRFLOW VALUES MAY BE
HIGHER THAN THOSE REQUIRED FOR COOLING .
BE SURE TO SIZE DUCT FOR THE MAXIMUM POS-
SIBLE AIRFLOW VALUE .
SIZE AIRFLOW DISTRIBUTION SYSTEM TO AC-
CEPTABLE INDUSTRY STANDARDS AND METH-
ODS . TOTAL STATIC PRESSURE DROP OF THE
AIR DISTRIBUTION SYSTEM SHOULD NOT EX-
CEED .8 INCHES W .C . THIS WILL INCLUDE ANY
AIR CONDITIONER COIL, AIR FILTRATION SYS-
TEM, ZONING SYSTEM, DUCTWORK, ETC . REFER
TO ADDED EQUIPMENT TECHNICAL INFORMA-
TION TO OBTAIN PRESSURE DROP INFORMATION
WHEN EQUIPMENT IS OPERATING AT RECOM-
MENDED HEATING OR COOLING CFMS .
!
WARNING
ZONING SYSTEMS ARE NOT DIRECTLY SUPPORTED
IN THIS MANUAL . IF A THIRD PARTY SYSTEM IS USED
REFER TO THE MANUFACTURER OF THAT PRODUCT
FOR INSTALLATION AND OPERATION INSTRUCTIONS .
ZONING SYSTEMS USED ON THIS PRODUCT MUST
HAVE SENSORS TO PREVENT FURNACES AND/OR
HEATING ELEMENTS FROM CYCLING ON INTERNAL
LIMIT CONTROLS . THE ZONING SYSTEM MUST NOT
ALLOW THE EVAPORATOR COILS AND/OR HYDRONIC
COILS TO FREEZE .
!
!
Summary of Contents for 801C Series
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