Chapter 108 Flashcards
A device used to control the flow of fluid, gas, water, air or steam
Control valve
A device used to position dampers and control valves
Actuator
A device which reacts to pressure, humidity, temperature to provide a two position floating or pro portioning control of an actuator or relay
Controller
A device used to control the flow of air in a duct or through a wall louvre
Damper
A term that refers to the normal electric supply voltage
Line voltage
A device that connects an actuator to a damper or control valve
Linkage
A term that refers to wiring or other electrical devices using 30 volts or less
Extra low voltage
A device used to change AC voltage from one value to another
Transformer
Remote bulb thermostat thermostats sensing bulb/capillary tube/bellows combination contains what liquid?
Volatile
Thermostats should be mounted how many meters above floor on an inside wall?
1.5m
The sensing device of a humidistat consists of?
A hygroscopic element
Three way valves are used in hydronic heating systems for?
Either mixing or diverting service
An electric radiator valve is an?
On/off valve
On-off switches are equipped with an open?
Contact switch
A bimetal thermostat operating temperature range is between?
10-32 degrees Celsius
