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
| 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.
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
For cold-chain and HACCP context in Australia, see AIRAH and their cold-chain guidance on maintaining ≤5 °C chilled and ≤-18 °C frozen product temperatures — useful when documenting HACCP events logged by the IR33.