Manual code 75803707A.0708
Page 60 of 64
13 GLOSSARY
• Proportional band: defines a temperature range of just a few degrees starting from the setpoint, within
which the system operates the control devices.
• Default: this term is used to describe the values (e.g. set-point and proportional band values) that will be
automatically applied by the system if the operator fails to set them.
• Free Cooling: introduction of external air into the environment by opening a damper or using cold water,
thereby cooling the environment and saving energy.
• Step: defines an area of the proportional band (of temperature or humidity) within which a device is
switched on and at the same time defines the values at which the device is switched on and off.
• Supply: the air delivered to the room by the air conditioner.
• Screen page: a page displayed on the screen.
• Ramp: the operating range of a modulating valve from 0% to 100%
• Range: range of values that may be assumed by a parameter.
• Return - Suction: air from the controlled environment returned to the air conditioner.
• Set-point: defines the temperature (or humidity) value to which the control system is set; the system
activates the hot or cold control devices until the temperature (or humidity) in the controlled environment
matches the set-point.
• 3-point valve - modulating valve: the 3-point valve is a commonly used valve that is operated by 2
relays:, one to control the opening and one to control the timed closing of the valve; the modulating valve is
controlled by a signal with voltage varying from 0 to 10 V.
• Dead band - neutral band: defines a very narrow temperature range between the set-point and the
proportional band within which the control devices are not operated.
To Next Page
Loading...
Need help?
General