Basic Hot Water Heating Systems Flashcards
What is the maximum capacity of a Class 2 transformer?
100 VA
What is the purpose of a reverse acting aquastat?
To prevent cold water from circulating in a heating system
A boiler with standing pilot ignition will incorporate a flame rod to prove the pilot flame.
True or False
False
The biggest advantage of a multi-zone system is:
a) individual zone temperature control.
b) only one circulation pump.
c) dustless heat distribution.
a) individual zone temperature control.
Which is not a recommended safety and control devices for a boiler?
a) aquastat
b) flow switch
c) LWCO
d) zone valve
d) zone valve
A circuit breaker can be used as a disconnect for a boiler.
True or False
True
The three wire zone valve:
a) maintains its position in a power failure
b) requires a special thermostat
c) requires power to open and close the valve
d) all of the above
d) all of the above
Which system utilizes a high-temperature element to ignite the main burner?
a) flame rod and ignition
b) direct spark ignition
c) hot surface ignition
d) standing pilot ignition
c) hot surface ignition
An end-of-travel, or end switch, is normally open set of contacts that will close when the zone valve opens?
True or False
True
Which of the following is not considered a terminal unit in a hot water heating system?
a) radiator
b) radiant panel
c) solar panel
d) plenum mounted heat exchanger
c) solar panel
A gas-filled bulb/capillary tube device utilized as a temperature switch in a hot water heating system is referred to as a/an:
a) pressure relief valve
b) low water cut-out
c) end switch
d) aquastat
d) aquastat
To create a spark, the ignition transformer supplies the spark igniter with typically:
a) 24V
b) 120V
c) 10kV
d) either b or c
c) 10kV
Intermittent circulation boilers must use a pilot light to the main burner.
True or False
False
In a single zone continuous circulation boiler system, the thermostat controls the:
a) circulation pump
b) gas valve
c) zone valve
d) all of the above
b) gas valve
A light-sensitive flame proving device will:
a) experience a change in resistance when exposed to light
b) emit a small amount of light when exposed to heat
c) generate a small emf when exposed to light
d) provide the means to ignite the pilot flame
a) experience a change in resistance when exposed to light
When two-wire valves are de-energized they will:
a) open
b) close
c) either a or b
c) either a or b
CEC rules 26-800 to 26-808 apply only to forced air heating systems and do not apply to boilers.
True or False
False
A reverse acting aquastat would be incorporated into a boiler control circuit to create a/an ___________ circulation system.
a) intermittent
b) continuous
c) cavitating
d) hydronic
a) intermittent
Circulation pumps can be a single or variable speed depending on the system.
True or False
True
A pressure relief valve opens when the boiler exceeds its maximum allowable working pressure.
True or False
True
Seprate water flow circuits in a hot water heating system are known as:
a) circulation systems
b) multi-zone
c) radiant panels
d) zones
—— Come back to this, no answer in the key.
What is the typical voltage for zone valves?
a) 10 V
b) 24 V
c) 120 V
d) 240 V
b) 24 V
What is the purpose of a flame rod?
to detect a burner flame
What is an LWCO used for?
to shut off the burner if the boiler water is too low.
What are the two types of aquastats?
a) immersion
b) surface mount
What is a device that transfers heat from one system to another called?
a) a heat transfer switch
b) a hydronic
c) a heat circulator
d) a heat exchanger
d) a heat exchanger
