Novus Automation N322S: Booster Output (Relay 2)
We receive lots of technical enquiries on our Differential Controller range. Please see below for some of our frequently asked questions on the Novus N322S.
What Is The Novus N322S?
The N322S is a Differential temperature controller which includes 2 sensors and 2 relay outputs. It can be used in Solar Heating, Air Circulation and Drying Applications. Heating water using solar panels can be achieved with the below layout:
What is difference between the N321S and N322S?
Quite simply, N322S has an extra relay output. This is a normally open relay rated to 5A for resistive loads. It operates based on the reading from Sensor 2 and the setpoint entered in parameter SP1. This could be used for a low or high limit.
But what can this Output be used for?
Output 2 can provide a backup to maintain the tank temperature. In a solar system it can be used to trigger auxiliary heating if the tank hits a lower limit. This could be because the solar panels are not providing sufficient heat. It could also be used to signal an alarm condition if there is no automatic backup.
How Can This Help In HVAC Applications?
Aside from Solar water heating, the N322S is a versatile solution for HVAC systems.
For air destratification, the additional relay can be used to trigger auxiliary heating. In this configuration, S1 is positioned at the top of the building and S2 located just above ground level (approx 2M). The normal working scenario is:
- Heat rises and builds at S1
- The differential setpoint dOn is reached
- Fans are activated
- Hot air is pushed back down to ground level
- dOff is reached and the fans turn off
In the event of SP1 being reached i.e. room temperature is too cold; a secondary heating system can be activated by Output 2.
How Can This Help In Drying Applications?
For grain drying the additional relay can be used to trigger auxiliary cooling fans or vents. S1 is used to measure the grain temperature. S2 is located outside the grain store to monitor ambient air. The normal working scenario is:
- Hot and humid air accumulates at S1
- The differential setpoint dOn is reached
- Fans are activated
- Hot air is extracted and replaced by cooler ambient air
- dOff is reached and the fans turn off
If SP1 is reached i.e. ambient air temperature is too cold; the overall system can be inhibited by Output 2. This helps to avoid cold air being drawn into the store which can lead to undesirable moisture.