Hallmark HBD1 15, Installation And Operation Instruction Manual

Thermostat Wiring Connections 

Locate the room thermostat on an interior wall in the natural circulating path of room air.  Do not 
locate the thermostat so it is exposed to cold air infiltration, drafts from windows or doors, air currents 
from supply or return air registers, behind obstructions, in a closet or in a corner. 
 
Ensure the thermostat won’t be exposed to heat from nearby fireplace, radio, television, lamp or rays 
from the sun.  Do not mount thermostat on a wall over a supply or return duct, chimney or vent. 
 
 

Oil Tank and Piping

                     Installation of oil tanks must meet all local codes and ordinances. Refer to NFPA-31 for 
complete guidelines on oil tank installations internal to the building, outside above and below ground 
tanks. 

WARNING

 
Oil tanks located inside the building shall not be in excess of 275 gallons individual capacity and shall 
not be located within 5 feet horizontally from any source of heat, either internal or external to the 
appliance being served or in a manner that the temperature of the oil in the tanks exceeds 25

º

F above 

room temperature.  

Connect burner to oil supply using the correct size heavy wall copper tubing, wrought iron, steel or 
brass fittings in accordance with the literature attached to the pump. All lines must have shut off 
valves, a good pipe joint compound approved for use with oil on all pipe threads, no kinks, no sharp 
bends, and be properly tested for leaks. 

Use flare fittings only when assembling oil lines

. Avoid use 

of fittings in inaccessible locations. Avoid running tubing against any type of heating unit and across 
ceiling or floor joists.  Piping shall be supported and protected from physical damage and where 
necessary, protected against corrosion as per code. Piping systems shall be maintained liquid tight.  A 
piping system that has leaks constitutes a hazard which must be repaired in an approved manner.  All 
oil feed lines to burners must be air tight.  The slightest air leak, caused by loose fittings, bad gaskets 
or any other reason, can cause a foaming oil stream which will cause any of the following conditions: 

a) Intermittent firing, causing safety shutdown. 
b) Poor starts. 
c) Smokey starts. 
d) Continual sooting of furnace and burner parts including the cad cell. 
e) Reduced firing rate, inefficient operation and erratic fire pattern. 
f) A dangerous combustion condition, allowing the combustion chamber to fill with a lean 

mixture (too much air in the oil stream) which could cause a delay in ignition of the fuel 
mixture until the danger point has been reached. 

This fuel unit when connected with a single pipe system is satisfactory only where the oil supply is on 
the same level or above the burner, permitting gravity flow of oil. When it is necessary to lift oil to the 
burner, a return line must be connected between the fuel unit and the tank. This requires the insertion 
of the "bypass" plug in the oil pump. The bypass plug and pump instructions are attached to the pump. 
Installation of a check valve in the suction line of a two pipe system is advisable under all 
circumstances. Be sure the check valve fittings are air tight.  If lift exceeds 10 ft. a two-stage pump 
must be installed with a two pipe system. 
 
If any part of the fuel oil tank is above the burner, an anti-siphon device must be used to prevent the 
flow of oil in case of an oil line breakage. 

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