4
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3.2 Safety Devices and Clearances
• All safety devices must be in place and functioning
properly when the equipment is in operation.
• All hydronic heater panels and doors must be kept
closed when the system is operating.
• The flue-gas exhaust pipe and rain-cap requires a
minimum of 6” (152 mm) clearance, from any type of
combustible material.
• Clearance from any obstructive objects must be
maintained to a minimum of 36” (914 mm) from both
ends of the Hydronic Heater.
• Do not allow anything to obstruct the “combustion air
intake”.
3.3 Heat Transfer Fluid
Precautions and measures to follow when working with
“heat transfer fluid” (Inhibited aqueous propylene glycol).
• Ventilation - Good general ventilation should be
sufficient for most conditions.
• Respiratory protection - No respiratory protection
should be needed.
• Skin protection - For brief contact, no precautions
other than clean body-covering clothing should be
needed.
• Use impervious gloves when prolonged or frequently
repeated contact should occur.
• Eye protection - Use safety glasses.
First aid measures.
• Eyes - Flush eyes with plenty of water.
• Skin - Wash off in flowing water or shower.
• Ingestion - Induce vomiting if large amounts are
ingested. Consult medical personnel.
• Inhalation - Remove to fresh air if effects occur.
Consult a physician.
• Note to physician - No specific antidote. Supportive
care. Treatment based on judgement of the physician
in response to reactions of the patient.
4 Specifications
4.1 Construction Specifications
• The HD308 includes an aluminum “enviro-
containment” base, with fork-lift pockets.
Length of Cabinet
inches (millimeters)
72 (1829)
Width of Cabinet
inches (millimeters)
22 (559)
Width of Fuel Tank
inches (millimeters)
31 (787)
Height of Cabinet
inches (millimeters)
48 (1219)
Height of Top of Rain Cap
inches (millimeters)
58 (1473)
Heat Transfer Fluid Capacity
US gallons (liters)
20 (76)
Fuel Tank Capacity
US gallons (liters)
116 (439)
Weight without Fuel Tank
pounds (kilograms)
600 (272)
Weight with Fuel Tank Empty
pounds (kilograms)
800 (363)
Weight with Fuel Tank Full
pounds (kilograms)
1700 (771)
• The exterior enclosure panels are made of stainless
steel.
• The framework for the enclosure and the base are built
of structural aluminum. A top center hoisting hook is
included.
• Primary access for operation and service is provided
for through hinged, lockable doors at the two ends of
the enclosure.
• Both side panels and both roof panels are fastener-
attached for potential removal.
• Then combustion chamber/heat exchange section is
fabricated from stainless steel.
• Access for cleaning the chamber is from the burner
end with minimal disassembly required. The procedure
consists of removing the burner and inside chamber
section.
• Temperature turn-down and condensing within the
chamber can not harm the chamber.
• The exhaust flue for the burner exits through the roof
of the enclosure. The exposed roof flashing is made
from aluminum. The rain cap and flue pipe are made of
stainless steel.
4.2 Dimensions and Capacities
4.3 Oil Burner and Fuel Specifications
(Fig. 3)
• The “oil burner” is a pressure-atomization type with
direct spark ignition.
• #1 or #2 light heating oil or diesel fuel may be used.
• A gauge is connected to a pressure-tap port on the
fuel pump of the burner to aid in setting the burner
and monitoring performance (Fig. 26).
• A fuel filter is mounted inside the enclosure (Fig.4).
• Supply and return fuel lines are equipped with quick
couplers for ease of connection to a fuel tank.
