In Reliatel MZVAV has the ability to be able to reset the air air temperature to a high setpoint when needed.
The RTAM has the ability to use three different options of supply air reset.
1) Space temperature (Needs to be provided as a hardwire sensor) Dip switch setting is
Dip Switch setting on RTAM board #3 Dip switch 3= On Dip Switch 4= Off
2) Return air temperature (Needs to be provided as a hardwire sensor)
Dip Switch setting on RTAM board #3 Dip switch 3= Off Dip Switch 4= On
3) OSA temperature (Which for cooling is not a common option to use)
Dip Switch setting on RTAM board #3 Dip switch 3= On Dip Switch 4= On
There are the four things to consider
1) Reset Setpoint
Is the enable point when reset starts resetting the supply air
2) Reset Amount
It is the amount of reset that is used to raise the supply air setpoint
3) Reset Type
The 3 different types of reset listed above
4) Supply Air Cooling Setpoint
It is the setpoint that the unit is going to try and maintain
We will use space temperature as a example
Supply air cooling setpoint is 55 degrees
Reset amount of 5 degrees
Reset setpoint of 70 degrees
If the space temperature is above the reset setpoint then the reset is not active and the supply air cooling setpoint will be 55 degrees once the space temperature drops below the reset setpoint of 70 degrees the supply air reset will be activated and will start resetting the supply air setpoint by the reset amount so if the space dropped to 69 degrees then you add that one degree that was lost in the space temperature to the supply air cooling setpoint so now it would be 56 degrees. So, for every degree the space temperature drops from the reset setpoint the supply setpoint will rise the same amount and a maximum of 5 degrees which would allow the supply cooling setpoint to be a maximum of 60 degrees.
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.