The N321S and N322S controllers are intended for solar water heating applications. They control the water circulation system based on the difference of temperature between the solar collector and the storage tank (or swimming pool). The instruments contain two NTC-type temperature sensors and a control output for activating the water circulation pump. It provides protections against overheating and freezing to the piping, preventing damages to the system.

Features & Specifications:

• N321S - One SPDT relay output for 1 HP (16A resistive) 250 Vac for pump control
• N322S – One SPST relay, 3A (5A resistive) 250 Vac for secondary output
• Temperature measuring range: NTC: -50 to 120°C (-58 to 248°F)
• Accuracy: NTC: 0.6°C (1,08°F),
• Resolution: 0,1°C or 0,1°F ranging from -19,9 to 199,9°C/°F
• Operational Temperature: 0 to 40°C
• Front panel with IP65 protection
• Operating temperature: 0 to 40°C (32 to 104°F)
• Sampling: 1.5 times per second
• Power supply: 100 to 240 Vac /dc ±10%
• Frequency: 50~60 Hz
• Consumption: 5 VA
• Differential control
• Anti-freeze setpoint
• Anti-overheating setpoint
• LED indicators 3 ½ digits
• Sensor offset adjustment
• Adjustable hysteresis
• Configurable setpoint minimum and maximum limits
• Configurable password for configuration lock
• Program retention during power failures
• Silicone keys with excellent durability
• CE and UL approved

NOTE: NTC sensor with 3 m cable is included in all NTC input thermostats