CE52‑24F Central Controller Installation & Wiring Guide – SDHV / KDHV (KDHA Uses Different Method)

⚠️ Safety Notice – Reverse Cycle Air Conditioners

This equipment must only be installed, commissioned, serviced and repaired by suitably qualified and licensed personnel.


Before commencing work, complete a task-specific risk assessment and ensure electrical isolation procedures, safe access, adequate service clearances and appropriate PPE have been considered. All work must comply with applicable regulations, standards and manufacturer requirements.


Particular care must be taken when working around electrical systems, refrigerant circuits, moving parts, roof spaces, ceiling spaces, confined spaces and working-at-heights hazards where applicable.


Do not proceed if safe access, required clearances, confined space risks or appropriate safety controls cannot be achieved and maintained. 


Safety takes priority over diagnosis, repairs, installation schedules and customer expectations. If the task cannot be completed safely, it must not proceed until the risks have been adequately controlled.


 CE52-24/F9(C)


Overview

This guide explains, how to connect and set up a CE52‑24F Central Controller to non‑VRF single split systems using the SDHV / KDHV connection method.
⚠️ Important: KDHA indoor units are compatible with the CE52, however they do NOT use the SDHV / KDHV wiring configuration described in this article. KDHA units must be connected using their own dedicated CE52 connection method, which is not covered here.
The CE52 allows you to control multiple indoor units from one central controller when the correct wiring method is used for the indoor unit type.


Pdf Owner's Manual CE52-24F(C)-B   AU1906 attached for reference

What You Can Connect (Using This Method)

  • ✅ SDHV indoor units
  • ✅ KDHV indoor units
  • ✅ Up to 36 indoor units (IDUs) per CE52 controller

What You Will Need

1. Power Supply

  • The CE52 requires 240 V AC power
  • Minimum power cable size: 1.5 mm²

2. Communication Cable (Very Important)

This cable allows the CE52 controller and indoor units to communicate with each other.
Recommended cable type:
  • Twisted‑core communication cable
  • Shielded cable is strongly recommended
Cable size rules:
  • Total network length under 1000 m → 2 × 1.0 mm² (18 AWG)
  • Total network length over 1000 m → 2 × 1.5 mm² (16 AWG)
  • Maximum total length: 1500 m (do not exceed)

3. Adapter Cables (Mandatory)

You must use Adapter Cable – Part Number 420400060252.
Quantity required:
  • Number of indoor units plus one (IDUs + 1)

Adapter Cable Pt# 420400060252


Example:
  • 5 indoor units → 6 adapter cables required
⚠️ Note: Connectors are not supplied with the adapter cable.

How to Wire the System (Simple Explanation)

  1. Connect a suitable 100–240 V AC power supply to the CE52 controller
  2. Use the adapter cables to connect:
    • CE52 controller → Indoor units
  1. All indoor units are connected along the COM BMS communication line
  2. The system supports a maximum of 36 indoor units
  3. Fit a matched termination resistance at the end of the communication network


Using Individual Room Controllers (If installed)

  • If an indoor unit also has its own wall or room controller, connect it to:
    • H1 / H2 terminals on the indoor unit
  • The room controller does not replace the CE52 connection — both operate together

Models and Compatibility – Quick Clarification

  • ✅ SDHV – Supported using this wiring method
  • ✅ KDHV – Supported using this wiring method
  • ⚠️ KDHA – CE52 compatible but requires a different wiring method
➡️ Refer to the KDHA‑specific CE52 installation instructions before attempting connection.

Common Mistakes to Avoid

  • ❌ Wiring KDHA units using the SDHV / KDHV method
  • ❌ Connecting more than 36 indoor units
  • ❌ Exceeding 1500 m total communication cable length
  • ❌ Using incorrect cable sizes
  • ❌ Forgetting to install termination resistance

Quick Checklist Before Power‑Up

✅ Indoor unit model confirmed
✅ Correct CE52 wiring method selected
✅ Correct cable sizes installed
✅ Adapter cables fitted
✅ Total cable length within limits
✅ Termination resistance installed
✅ Power supply connected to CE52

Summary

The CE52‑24F Central Controller is straightforward when installed correctly:
  • One CE52 controller
  • Up to 36 indoor units
  • Correct communication cable and adapters
  • Correct termination
  • Correct wiring method for the indoor unit model
Following this guide will help prevent communication faults, mis‑wiring, and unnecessary service calls.