INSTALLING THE FURNACE
INSTRUMENTS REQUIRED FOR PROPER SETUP OF THE FURNACE
It is important that a set of instruments capable of the following requirements be used for the setup of this furnace to ensure proper and safe operation:
1.Oil pump pressure gauge that measures up to 150 PSI.
2.Smoke gun to pull smoke samples from flue.
3.Draft gauge that will measure
4.Duct static pressure gauge
5.Temperature gauge that can read from 50° F up to 700° F.
6.A gauge to measure CO2 or O2.
INSTALLATION
A typical installation is shown in Figures 4 and 5. All parts of the furnace installation (furnace, oil tank and piping systems, combustion and ventilation air, venting, etc.) must comply with NFPA31, Installation of Oil Burning Equipment
Check the furnace and your load calculation to verify that the unit is properly sized. (Refer to “Equipment Selection” section on Page 4.)
The correct size of unit needed may be substantially smaller than the unit being replaced due to home improvements and technology advancements since the initial installation.
INADEQUATE SUPPLY AIR and/or RETURN AIR DUCT SYSTEMS
Short cycling because of limit control operation can be created by incorrectly designed or installed supply and/ or return air duct systems.
The duct systems must be designed using ASHRAE or ACCA design manuals and the equipment CFM and external static pressure ratings to insure proper air delivery capabilities.
On replacement installations, particularly if equipment is oversized, the duct systems can easily be undersized. Modifications may be required to assure that the equipment is operating within the approved temperature rise range when under full rated input conditions, and that no short cycling on limit controls is occurring.
DUCT WORK
The air distribution system should be designed and installed in conformance with manuals published by Air Conditioning Contractors of America (ACCA) as set forth in Manual D, or ASHRAE publications.
IMPORTANT
When a furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air must also be handled by a duct(s) sealed to the furnace casing and terminating outside the space containing the furnace This is to prevent drawing possible hazardous combustion products into the circulated air.
INSTALLING A COOLING UNIT
When the furnace is used in connection with a cooling unit*, the furnace shall be installed parallel with or on the upstream side of the cooling unit to avoid condensation in the heating element. With a parallel flow arrangement, the dampers or other means used to control flow of air shall be adequate to prevent chilled air from entering the furnace, and if manually operated, must be equipped with means to prevent operation of either unit, unless the damper is in the full heat or cool position.
*A cooling unit is an air conditioning coil, heat pump coil or chilled water coil.
When installing a cooling unit above an FH or FL (below on an FC) series furnace, the coil must be spaced far enough from the furnace outlet to assure proper operation of the furnace. Bard supplied coils, when used with Bard supplied coil cabinets, are automatically positioned.
For top discharge FH and FL models, when coils are installed without using Bard coil cabinets or coils of another brand are used, the coil drain pan should be located a minimum of four (4) inches above the top of the furnace cabinet. If a greater clearance is specified by the coil manufacturer then it would apply.
NOTE: IF DRAIN PAN IS ANYTHING OTHER THAN A STEEL PAN PARTICULAR ATTENTION MUST BE GIVEN TO THE INSTALLATION INSTRUCTIONS FOR THE COIL TO MAKE SURE IT IS ACCEPTABLE FOR USE WITH THESE OIL FURNACES HAVING MAXIMUM OUTLET AIR TEMPERATURE OF 200° F.
See CFM versus static pressure curves on pages
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