Carel IR33 On/Off Temperature Controller, 76.2 x 101mm, 230 V ac Supply Voltage

Carel IR33 is a smart, trade-ready refrigeration controller for fridgies and contractors who want fast installs and fewer call-backs. Choose from pre-loaded applications, wire it in, and you’re away — fair dinkum simple.

This versatile controller offers multiple probe inputs and relay outputs, making it ideal for a wide range of commercial refrigeration systems. Its robust design and user-friendly interface ensure reliable temperature management and reduced maintenance needs, streamlining your projects from start to finish.

Why It Matters

Real job: you’re on a Brisbane bakery callout, freezer’s warm, staff are sweating bullets and it’s 38°C on the roof. With the IR33’s pre-loaded apps you can swap, wire, select the config and restore temp control before the pies turn. That’s a ripper result — and no worries about compliance thanks to the 4-relay model’s HACCP logging for cold-chain documentation. For more controllers and spares, see our Refrigeration category.

What's Included

• 1 × Carel IR33 smart refrigeration controller (selected model)
• Plug-in terminals (as supplied)
• Quick start info (on-unit/packaging)

Features & Benefits

• Pre-loaded configurations → Rapid commissioning with minimal parameter work, ideal for tight timelines.
• Up to 3 NTC/PTC probe inputs → Flexible sensor options for room, evap and condenser monitoring.
• 1–4 relay outputs → Control compressor, defrost, fan and aux without extra modules.
• 16A compressor output → Reliable switching for common commercial systems.
• Real-time clock + HACCP (4-relay version) → Timestamped events and alarm history for compliance.
• Optional RS-485 networking → Plug into monitoring/BMS for remote checks and fewer site visits.
• IP65 panel face with infrared receiver & buzzer → Durable front and clear alerts in noisy plant rooms.
• 115–230V AC supply → Broad input range simplifies spares and stock.

Applications

• Suitable for a wide range of commercial refrigeration systems, including supermarkets, bottle shops, coolrooms, display cases, and freezers.
• Supports both NTC and PTC thermistors for flexible sensing options.
• Available with 1-4 relays to precisely control compressor, defrost (electric/hot gas), evaporator fan, and auxiliary functions.
• Optional RS-485 networking for seamless integration into monitoring and building management systems (BMS).
• The 4-relay version provides HACCP-style timestamping, assisting in cold-chain documentation in line with Australian standards (e.g., ≤5 °C chilled, ≤-18 °C frozen).
• IP65 panel face ensures durability and resistance to dust and wash-downs, making it ideal for diverse Australian plant room conditions, from steamy Sydney summers to dry Adelaide environments.

Specifications

Feature	Detail
Inputs	Up to 3 × NTC or PTC (model dependent)
Relay Outputs	1 / 2 / 3 / 4 relays for compressor, defrost, fan, aux
Compressor Output	16 A
Supply Voltage	115–230 V AC
Networking	Optional RS-485 serial connection
Interface	Infrared receiver & buzzer
Enclosure (front)	IP65, panel mounting
HACCP/RTC	Available on 4-relay version

Specs drawn from the IR33 product listing and Carel IR33 documentation.

Tradie Pro Tip

Using multiple probes? Label each sensor and verify probe type (NTC/PTC) in the IR33 before handover. A 60-second check here saves a return trip later.

Pair With

• Need a spare NTC probe? This 3.0 m sensor is a helpful add-on for commissioning and replacements.
• Fitting out a panel? This enclosure keeps your controller tidy and protected on site.
• Need a simpler Carel option? This compact controller suits basic single-phase temperature control.

Keep Your Space Clean / CTA

Ensure your refrigeration systems run efficiently and reliably with the Carel IR33. Explore our full range of refrigeration controllers and accessories to keep your HVAC setup performing at its best, reducing downtime and ensuring peak performance.