NOVUS N322S Temperature Controller, Electronic Thermostats User Manual

NOVUS N322S Temperature Controller, Electronic Thermostats User Manual

The N322S is a controller intended for solar water heating applications. It controls the water circulation system based on the difference of temperature between the solar collector and the thermal storage tank (or swimming pool). The instrument has 2 NTC-type temperature sensors and 2 outputs: a control output (output 1) for activating the water circulation pump and a backup output (output 2). It prevents pipe damage during winter and overheating, preventing pipe damage and thermal discomfort.

SPECIFICATIONS

SENSOR INPUT:

• Thermistor NTC, 10 k @ 25 °C; Range: -50 to 120 °C (-58 to 248 °F); Accuracy: 0.6 °C (1.1 °F); Maximum error in the interchangeability of original NTC sensors: 0.75 °C (33.35 °F). This error can be eliminated through the offset parameter of the equipment.

Note: The sensor comes with the equipment. Its operating range is limited to -30 to +105 °C (-22 to +221 °F). It has cable of 3 m in length, 2 x 0.5 mm², and can be extended up to 200 meters.

Installation recommendations: The temperature sensor wires should be installed through the system layout separately from the control output and power supply wires. If possible, in grounded conduits. The power supply to the controller should preferably come from a network proper for the instrumentation or from a different phase from the one used by the control output. It is recommended to use RC FILTERS (47 and 100 nF, series) in contactor coils, solenoids, etc.

ELECTRICAL WIRING

The following figure indicates the connection, power supply, and output terminals of the controller:

OUTPUT1 is the Circulation Output.
OUTPUT2 is the Backup Output.

• Serial communication feature is not always present in the controller.

OPERATION

Before use, the controller must be configured. To configure it, you must set values for the parameters that determine how the equipment will operate.
These configuration parameters are organized in groups or Levels, called Parameter Levels.

Level 1 ­ Setpoint Level Adjustment

Level 2 ­ Programming Level
This level displays the remaining parameters to be configured. The parameters are shown alternately and with their values. To program the desired value, use the and keys.

Level 3 ­ Calibration level
The controller leaves the factory perfectly calibrated. When a recalibration is necessary, it must be performed by a specialized professional.

To access this level, the key must be pressed for more than 4 seconds. This level also contains the configuration protection parameters.

If accessed by accident, it is recommended to go through all the parameters without changing them until the controller returns to the measurement screen.

As the solar collector receives energy, the temperature at sensor S1 increases. When this temperature reaches a value higher than the temperature measured at S2, the pump is turned on and circulates downward the heated water, storing it in the storage tank.
With the pump on, the hot water circulates downwards and the cold water circulates upwards. Therefore, the temperature difference between S1 and S2 tends to decrease. When this difference falls below a certain minimum value, the pump is turned off and the water circulation stops.
On the controller’s front panel, the P1 LED lights up when the control output is turned on. The P2 LED lights up when the backup output is turned on.

CONFIGURATION PROTECTION

The configuration protection system is designed to prevent undue changes to the controller’s parameters and, consequently, to its operating mode. This system is composed of parameters that define the degree of protection adopted (whether total or only partial). Parameters that define the protection:

Pas: Parameter to enter a password, which must allow changes in the other parameters.
Prt: Defines the parameter levels to be protected:
1 – Only the calibration level is protected (factory configuration).
2 – Calibration and configuration levels are protected.
3 – All levels are protected (calibration, configuration and setpoints).
PAC: Parameter that allows changing the current password. You can set a number between 0 and 1999 as the password.

Operation of the configuration protection
The PAS parameter appears at the beginning of the level that is protected. If you enter the password correctly, you can change the parameters of the protected levels. If you do not enter the password correctly or simply skip past this parameter, the parameters of the protected levels can only be viewed and not changed.

Important notes:
1 – If you enter an incorrect password five times in succession, the equipment prevents further attempts for 10 minutes. If you forget the current password, you can enter the master password, which allows you to set a new password only.
2 – The equipment leaves the factory with the password 111.

MASTER PASSWORD

The master password, which allows you to set a new password for the controller, uses the serial number of this equipment. It is composed as follows:

[ 1 ] + [ higher digit of SN2 ] + [ higher digit of SN1 ] + [ higher digit of SN0 ] The master password for an equipment with serial number 97123465 is: 1936
As follows: sn2= 97; sn1= 123; sn0= 465 = 1 + 9 + 3 + 6

How to use the master password:
1 – Enter the master password in the PaS parameter.
2 – In the PA( parameter, enter a new password, which must be different from zero (0).
3 – Use the new password.

ERROR MESSAGES

In its display, the controller presents messages that correspond to problems related to temperature measurement. Whenever they are displayed, the control output relay will be turned off immediately. If it is configured to show the differential temperature, the value shown will be zero, according to the table below:

WARRANTY

Warranty conditions are available on our website www.novusautomation.com/warranty.

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