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36 Cards in this Set
- Front
- Back
Define a Window type radiator
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Radiators for installation where height is limited such as under windows
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Define a Wall-hung radiator
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Radiator which is hung on the wall of the room
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Define a Floor type radiator
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Radiator equipped with legs which stand on the floor
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The device which allows condensate to drain from a steam heater but stops the steam from escaping is called a:
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Radiator Trap
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If a heating system condensate reciever is vented to atmosphere, the pressure in the condesate return piping will be:
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Atmospheric Pressure
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List three methods that may be used to improve condensate returns in building complexes covering large areas, such as shopping centers.
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1.Vaccum pumps
2.Higher steam pressures in steam suppy lines 3.Heat exchange equiptment to force the condensate through its piping |
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List the two functions of a vaccum pump
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1.It creates and maintains a vaccum in the retun piping to assist in condensate return
2.It returns condensate to the boiler |
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LIst three requirements of a steam heating piping arrangement in order to ensure adequate flow through the system. The piping must be arranged to:
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1.Allow steam to flow freely and in sufficent quanities to all heating units
2.The condensate to be removed freely from the units and returned to the boiler 3.The air can be expelled from the heating units and piping |
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In a two pipe variable vaccum system the steam temp can be controlled between ____ and ____. The vaccum in the return system should be _____ to _____ below the vaccum in the steam suppy
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1.55-105 degrees C
2.85-101.3 kPa |
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What two parties would normally inspect a new heating system before it is put into service
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1.The heating contracter
2.Provincial Inspector |
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What two items cause the most problems with radiators and convectors
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1.Valves
2.Traps |
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A hot water heating system is also called a:
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Hydronic heating system
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A hot water heating system boiler, piping and heating units are completely filled with water except for:
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Some air space in a conventional expansion tank
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List the disadvantages of using a pump for circulating water in a forced circulation heating system
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1.Noise of operation
2.Increased power costs 3.Increased maintenance |
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The temp of the hot water used in radiant heating systems should be limited to below ___ for ceilings and _____ for floors
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1.46 degrees C
2.30 degrees C |
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State what fluid is normally using in snow melting systems using liquid filled radiant heat panels.
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Ethylene Gylcol (Antifreeze)
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Give two reasons for using Nitrogen instead of air to charge an expansion tank for large heating systems
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1.Nitrogen is less soluble in water
2.Nitrogen does not cause corrosion |
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In any hot water heating system the pressure at the suction of the circulator must be kept above the pump's:
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Net Positive Suction Head
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List three types of heat sources or heat exchangers used in forced warm air heating systems
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1.Directly fired
2.Electric resistance coils 3.Fin-coil heat exchanger |
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The resistance coil type forced air heating systems uses electric coils which are usually supplied by:
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240 Volts
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A typical warm air furnace has a thermal efficiency of
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80-96%
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The acronym AFUE stands for:
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Annual Fuel Utilization Efficency
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List four improvements that have been made to forced air heating system furnaces in order to increase efficiency
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1.Installing a vent damper
2.Electronic ignition 3.Improved heat exchanger design 4.Addition of a secondary or terciary heat exchanger |
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In a pulse burner, the pulse combustion occurs at about:
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60-70 times per second
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Gas fired warm air furnaces commonly use:
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Atmospheric gas burners
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Name two methods of connecting the drive motor for a warm air furnace to the blower
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1.Metal clutches mounted on the motor shaft
2.A V-belt connection between pullys on the motor shaft and blower shaft |
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Two types of furnace filters use in warm air systems are:
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1.Mechanical
2.Electronic |
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After leaving the heat exchanger, the warm air is discharged through the _______ to the duct system which distributes the air to the building
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Plenium
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List three reasons that ventilation is important for comfortable living conditions
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1.Remove the stale air containing, odours, smoke, etc
2.To supply fresh clean air into occupied spaces 3.Needed to prevent condensation onn walls and windows |
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List two requirements of a ventilation system
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1.The air is evenly spead over the whole area
2.The air does not directly strike the occupants |
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The size of airborn contaminants is measured in
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Microns
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The best filters available for ventilation system lint removeal are:
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Dry Mechanical Air Filters
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State the advantages of bag type filters and multi-wedge filters when compared to flat dry filters used in ventilation
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1.Very large filtering area
2.Large dirt holding capacity 3.Longer service life then pad type filters |
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True or False: Reusable filters are produced in dry type but are not available as viscous filters
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False
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List two types of electronic filters used in ventilation systems
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1.Electrostatic precipitation
2.Charged-media electronic air cleaners |
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The most common material used for electirc heating elements is:
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Nickel-chromium resistance wire
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