Hydronic Heat Quiz Flashcards
- Which device protects the boiler from excessive pressure?
Pressure relief valve
- What is the purpose of the boiler operating control?
Mainrain normal operating temperature
- Which addictional device is required to protect finned tube or low mass heating blilers?
Flow switch
- Which device protects the boiler and heating system from water change due to thermal expansion?
Expansion tank
- What is the difference between a wet floor and dry floor radiant panel installation?
A wet floor panel is installed in concrete and the dru floorbis under a subfloor
- The ideal location for a pump is immediately
Downstream of the point of no preasure change
- The location where the compression tank and its piping join the system piping is called ?
Point of no pressure change
- A circulator that is oversized will:
Be noisy when it is operating
- Flow check valves are used to:
Stop thermo siphoning
- A differential pressure bypass is used to:
Ensure continuous flow
- A thermostat originates a demand for heat by:
Sensing air temperature
- An aquastat senses:
Water temperature
- A sensing device that opens its switch contacts when reaching a set temperature or pressure is:
Direct acting
- When a bimetal strip is subject to temperature increase, it:
Warps
- A boiler burner is turned on and off by an
Aquastat
- A zone valve is controlled by a:
Thermostat
- A zone valve controls the flow of:
Water
- A relief valve senses and reacts to water:
Pressure
- A high limit burner safety switch with a manual reset button is:
An aquastat
- A convector heats a room by heating the:
Air
- Convectors that have fans are called:
Unit heaters
- The heating element of a convector is usually made of:
Finned pipe
- The amount of heat given off by a hot gravity circulation convector is usually regulated by an adjustable:
Louvre
- The two types of unit heaters are
Vertical and horizontal
- Which type of tubing allows the most oxygen diffusion?
Ethylene propylene diene monomer
EPDM
- Which type of tubing has the thinnest walls of plastic tubing?
Polybutylene
PB
- Which type of tubing is most flexible?
EPDM
- Which type of tubing is highly resistant to chemicals including oils?
PEX
Which type of heat transfer is not normally installed under a window?
Unit heaters
Eccenstric reducers prevent
Air pockets
The lower the max cold temperatures is, the amount of glycol you need to put into solution:
Becomes greater
Where tubing passes through an expansion joint in a concrete slab, you must install:
A pipe sleeve
When installing radiant panel tubing within a structural slab, you should tie straight runs of tubing:
Every meter; (3’)
Insulation and a heat reflector must be installed when you install a radiant panel;
Under a wood floor
Radiant panel installation for large commercial products are zoned by:
A manifold
When sizing the boiler, you should add a minimum of ________ additional output capacity to the calculated heat requirements
15%
One series loop should be limited to:
60,000 btuh
If you are installing baseboard heat transfer units, divide the heat loss of a room by the
Units capacity per linear foot
The head pressure of a pump should be at least
The head of the longest circuit
The total equivalent length is:
1.5 times the length of the longest circuit
If the thermostat is not exposed to circulating air, what will happen?
the temperature will swing widely
if the transformer is defective; what will happen?
there will not be any heat
if the low voltage circuit is open, what will happen?
there will not be any heat
if the thermostat is directly exposed to sun, what will happen?
the temperature will swing widely
if the zone valve is not closing, what will happen?
there will be too much heat
you are required to replace a bearing and seal assembly on a 3 piece hydronic circulator, what are the correct steps?
b. power off, isolate pump, loosen the set screw on spring coupler, ……
How does a heating system provide a more comportable living space?
By controlling the rate at which radiant energy leaves out bodies
The flow of heat energy travels in which direction!
From hot to cold
Which factor that influences the size of heating systems takes into account tue notmal coldeat temperature dor the region?
Design temperature differnce
Fire tube boilers are well suited for :_____ water heating or ___\ heating
Hot wayer or steam heating
Boilers in hot water systems usually operate at ____ c
82 C; 180 F
High efficiency boilers reauire a _____ drain
Floor
Air vents on a heating system _____ air
Remove
Which type of tubing has the property of returning to its original shape?
Crosslinked polyethylene PEX
The min bend radius should be ____ times the diameter of the tube
10
Which system is the most balanced system that uses heat transfer units?
Reverse return
The max velocity through hot water pipes shoild be:
4 ft / sec
