SUSPENDED INSTALLATION
Refer to Figure 1. Maintain clearances to combustibles as outlined in Table 1. The furnace may be suspended by field fabri- cating a cradle of angle iron and threaded rod. Secure the furnace with 2 inch minimum slotted angle or equiva- lent, as shown in Figure 1. The furnace must be supported in such a way as to not allow twisting or sagging of the cabi- net. Position the supports so as to not interfere with accessing the burner and blower compartments. Suggestion; as a measure to prevent fuel oil from accumu- lating in locations other than the fire pot, as could be the case in the event of noz- zle drip, install the furnace with an ap- proximate 2 degree slope from the oil burner casing towards the fire pot.
AIR CONDITIONING
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 en- tering 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.
Generally, a six-inch clearance between the air conditioning evaporator coil and the heat exchanger will provide adequate airflow through the evaporator coil.
The blower speed must be checked and adjusted to compensate for the pressure drop caused by the evaporator coil. Re- fer to Appendix B for recommended wir- ing and electrical connections of the air conditioning controls.
COMBUSTION AIR
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 op- eration. 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 construc-
tion, 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 communi- cating with a well ventilated attic or with the outdoors shall be provided, using a duct if necessary. Size all of the open- ings and associated ductwork by the standards provided in the latest Oil In- stallation Code editions; NFPA 31 in the United States, CAN/CSA B139 in Can- ada. Take all fuel burning appliances in the area into consideration when calcu- lating combustion and ventilation air re- quirements.
The Model CAS-2B-90E Furnace Boot manufactured by Field Controls, Inc. may be used with the furnace to obtain com- bustion 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.
CHIMNEY VENTING
The chimney must be sized correctly and be in good repair. If the chimney is over- sized, there is a high risk of the flue gases condensing resulting in damage to the chimney and other venting parts. This problem may be corrected by the use of an appropriately sized chimney liner.
If the chimney serves the P3DHX12F08001 furnace only, the vent should be sized at 4-inch minimum, 5- inch maximum. If the chimney serves the P2DHX16F12001 or P2LBX16F14501 furnace only, the vent should be sized at 4-inch minimum, 6-inch maximum. If the chimney serves the P4LBX20F19001 furnace only, the vent should be sized at 5-inch minimum, 7-inch maximum. The data provided in Table 3 is based on dedicated venting. If the furnace is to be co-vented with other appliances, refer to NFPA 211, Standard for Chimneys, Fire- places, Vents, and Solid Fuel-Burning Appliances, NFPA 31, Standard for the Installation of Oil Burning Equipment or CAN/CSA B139, Installation Code For Oil Burning Equipment for correct sizing information.
NOTE:This furnace is approved for use with L-Vent.
NOTE:Maximum temperature for L- Vent is 575°F (300°C).
IMPORTANT: The chimney must be capable of providing sufficient draft at all times for the safe removal of the prod- ucts of combustion.
The chimney should be tested under “winter” conditions; doors and windows closed, all other fossil fuel burning appli- ances on, clothes dryer on, bathroom fans on, etc. If the chimney cannot over- come the competition for air, it will be necessary to access the reason for it, and take corrective action. If the chimney is found to be sized correctly and in good repair, it will probably be necessary to re- evaluate the availability of combustion and ventilation air, and take corrective action.
The flue pipe should be as short as pos- sible with horizontal pipes sloping up- ward toward the chimney at a rate of one-quarter inch to the foot. The flue pipe should not be smaller in cross sec- tional area than the flue collar on the furnace. The flue pipe may be reduced in size to fit a smaller diameter chimney with the use of a tapered reducer fitting at the chimney inlet. The flue pipe should connect to the chimney such that the flue pipe extends into, and terminates flush with the inside surface of the chimney liner. Seal the joint between the pipe and the lining. The chimney outlet should be at least two feet above the highest point of a peaked roof. All unused chimney openings should be closed. Chimneys must conform to local, provincial or state codes, or in the absence of local regula- tions, to the requirements of the National Building Code.
See Figure 2 and Table 2 for common chimney problems and their remedies.
THE FURNACE MUST BE CON- NECTED TO A FLUE HAVING SUFFI- CIENT DRAFT AT ALL TIMES TO EN- SURE SAFE AND PROPER OPERA- TION OF THE APPLIANCE.
The flue pipe must not be routed through concealed space, because it must be visually checked for signs of deteriora- tion during the annual inspection and servicing. The flue pipe must not pass through any floor or ceiling, but may pass through a wall where suitable fire protection provisions have been in- stalled. In the United States, refer to the latest edition of NFPA 31 for regulations governing the installation of oil burning equipment. In Canada, refer to the latest edition of CAN/CSA B139 for rules gov- erning the installation of oil burning equipment.
