Royal Appliance Air Furnace Manual De Usuario

 

29733 R2  06/01/2003

 

6

 

Maintain clearances to combustibles as outlined in Table 
1. Installation on a combustible floor requires a clearance 
of 1 inch. This can be done by using a noncombustible 
material such as one-inch thick channel iron or similar 
material. The furnace must be supported in such a way 
as to not allow twisting or sagging of the cabinet. 
Suggestion; as a measure to prevent fuel oil from 
accumulating in locations other than the fire pot, as could 
be the case in the event of nozzle drip, install the furnace 
with an approximate 2 degree slope from the oil burner 
casing towards the fire pot. Use shims made of 
noncombustible material. 

 

Refer to Figure 1. Maintain clearances to combustibles 
as outlined in Table 1. The furnace may be suspended by 
field fabricating a cradle of angle iron and threaded rod. 
Secure the furnace with 2 inch minimum slotted angle or 
equivalent, as shown in Figure 1. The furnace must be 
supported in such a way as to not allow twisting or 
sagging of the cabinet. Position the supports so as to not 
interfere with accessing the burner and blower 
compartments. Suggestion; as a measure to prevent fuel 
oil from accumulating in locations other than the fire pot, 
as could be the case in the event of nozzle drip, install 
the furnace with an approximate 2 degree slope from the 
oil burner casing towards the fire pot. 

If the furnace is used in conjunction with air conditioning, 
the furnace shall be installed in parallel with or upstream 
from the evaporator coil to avoid condensation in the heat 
exchanger. In a parallel installation, the dampers or air 
controlling means must prevent chilled air from entering 
the furnace. If the dampers are manually operated, there 
must be a means of control to prevent the operation of 
either system unless the dampers are in the full heat or 
full cool position. The air heated by the furnace shall not 
pass through a refrigeration unit unless the unit is 

specifically approved for such service. 
The blower speed must be checked and adjusted to 
compensate for the pressure drop caused by the 
evaporator coil. Refer to Appendix B for recommended 
wiring and electrical connections of the air conditioning 
controls. 
 

When a furnace is installed in the full basement of a 
typical frame or brick house, infiltration is normally 
adequate to provide air for combustion and draft 
operation. If the furnace is installed in a closet or utility 
room, two (2) ventilation openings must be provided 
connecting to a well ventilated space (full basement, 
living room or other room opening thereto, but not a 
bedroom or bathroom). One opening shall be located 6" 
from the top and bottom of the enclosure at the front of 
the furnace. For furnaces located in buildings of 
unusually tight construction, such as those with high 
quality weather stripping, caulking, windows and doors, or 
storm sashed windows, or where basement windows are 
well sealed, a permanent opening communicating with a 
well ventilated attic or with the outdoors shall be provided, 
using a duct if necessary. Size all of the openings and 
associated ductwork by the standards provided in the 
latest Oil Installation Code editions; NFPA 31 in the 
United States, CAN/CSA B139 in Canada. Take all fuel 
burning appliances in the area into consideration when 
calculating combustion and ventilation air requirements. 
 
The Model CAS-2B-90E Furnace Boot manufactured by 
Field Controls, Inc. may be used with the furnace to 
obtain combustion air directly from outdoors. Use of this 
device does not alter the need for ventilation air; 
however, it does provide a good direct source of 
combustion air and is connected directly to the oil burner. 

 

Figure 1: Typical Suspended Application