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.

Key Features & Trade 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.

Why This Product 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.

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.

Compatibility & System Info

Works across commercial refrigeration — supermarkets, bottle shops, coolrooms, display cases and freezers. Supports NTC & PTC thermistors; versions with 1–4 relays for compressor, defrost (electric/hot gas), evap fan and aux; optional RS-485 for monitoring.

Food service teams: HACCP-style timestamping on the 4-relay version helps document temperature control in line with Australian cold-chain expectations (keep chilled foods ≤5 °C; frozen at ≤-18 °C).

Local Install Notes

In steamy Sydney summers or dry Adelaide plant rooms, the IR33’s IP65 front handles wash-downs and dusty spaces like a champ — just remember proper panel sealing and strain relief. She’ll be right.

What’s Included

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

Specifications

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

Warranty & Returns

Covered by HVAC Shop’s standard warranty & returns policy. If your controller arrives damaged or not as described, we’ll sort it — quick smart. See our Shipping & Returns page for details.

FAQs

Q: Do I need to program all the parameters from scratch?
A: No — select from pre-loaded configurations and fine-tune only what you need. Great for fast swaps.

Q: Can the IR33 log events for HACCP?
A: Yes — the 4-relay variant includes a real-time clock and HACCP functions for alarm/history.

Q: Does it support remote monitoring?
A: All versions can be connected via optional RS-485 for programming/monitoring.

Q: Which probes should I use?
A: The IR33 supports NTC and PTC thermistors. For standard room/evap sensing, many techs use NTC probes — confirm the required spec for your model and application.

Related Products

• 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.