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4.5 System and Ductwork Design
Good duct design and sizing are essential to every Brivis ICE cooling system. Use the Brivis “SuperSizeGuide”,
Technical Data Sheets or HB276. In general:
•
Ductwork should be airtight and have a minimum insulation rating of R1.0
•
It should also be properly sized, and curves and bends should be smooth enough to ensure that the air flows
through efficiently, quietly and with minimal resistance
•
The registers and diffusers should be large enough and of good design. They should minimise noise, while
providing the correct distribution pattern
•
The positive return air system should be fitted with a grille large enough to accept the full air capacity of the
system at low noise levels
•
Adequate air filtration must be provided
•
If the system uses high level outlets (e.g. ceiling diffusers), then the return air inlet should be at a low level
4.6 Brivis Heater Thermistor position (if applicable)
•
Mount heater thermistor in the
discharge (outlet) pop
of the cooling coil
•
Drill a 3/4” (20mm) diameter hole through the top of the evaporator coil’s outlet pop
•
Carefully insert the thermistor assembly (probe end first) into this hole and secure using the two screws provided
•
Ensure that the thermistor plug is facing upwards and is accessible for servicing
•
Connect the thermistor extension lead from the heater to the thermistor assembly and ensure that the plug is
connected securely
•
Ensure that the thermistor extension lead is secured to timbers or duct outer casing to prevent damage
4.7 Filtration
A filter must be fitted into the system, and should be easily accessible for regular cleaning. Please refer to the guidelines
for return air filter grilles accompanying the Gas Ducted Heater.
Note:
It is important that all ductwork and fittings be insulated. It is mandatory under some building codes to also install
fire rated duct. Check with your local authority.
