I'm Feeling Lucky
The difference between system overshoot and system lag.
temperature swing
Used to prove that the combustion blower motor is operating before ignition.
sail switch
It's the measurement of current.
amps
What high pressure control contacts are normally.
closed
The ability to reduce the flow of electrons.
resistance
Rapid making and breaking of a contact.
detent
It's how the cold anticipator is wired with the mercury bulb cooling contacts and is energized during the off cycle.
parallel
The net oil pressure of a system where the suction pressure is 60 psig and the oil pump outlet is 85 psig
25 psig
It's used to describe when the temperature of a heated room falls below the thermostat's set point
system lag
It's used in some applications to sense temperature in a moving air stream.
helix coil
It's when the heat anticipator in the thermostat control circuit in the heating mode is active
when the heating contact is closed
When the heater in the thermostat control circuit in the cooling mode is active
when the cooling contact is open
The proper setting to turn on a system at 28 psig and shut down at 2 psig
High event: 28 psig, differential: 26 psig
Its attached to a large diaphragm to control ice build-up on a heat pump outdoor coil in the heating cycle.
micro-switch
A group of thermocouples wired in series with each other to provide a higher output voltage
thermopile
They must determine what the current flow is through the heating control circuit when the furnace is operating in a steady state condition.
heating technician
It's how to obtain an accurate reading of a fluid in a large pipe
use a permanently mounted thermometer in a well
Measures the difference in pressure to establish that positive oil pressure is present.
oil pressure safety controls
Where a water regulating valve that is controlling head pressure is installed.
water circuit at the inlet of condenser
It's used to describe when the temperature of a heated room rises above the thermostat's set point
system overshoot
Sensing elements used in line voltage thermostats with heavier contacts.
bimetal, bellows, and remote bulb
The manifold pressure of many natural gas fired heating units
3.5 in
It's why two different metals are used to produce movement in bimetal elements.
when metals expand and contract at different rates as temperature changes
Starts the cooling system early to allow the air-conditioning system to get up to capacity when needed.
cold anticipator
A battery produces 12.6 volts what would be the current flow for a 6 Ohm resistor?
2.1 amps