SCM CUBO2 SMART - User Manual

SCM CUBO2 SMART

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OEM Manual – CUBO

2

SMART

Pag. 1

OEM Manual (EN)

Version UMTT-MT OEM rev. 2.1 date 28/05/2019

Table of Contents

Questions and Answers

R
Raymond WebsterAug 5, 2025
What to do if MT compressor of SCM Heat Pump does not start?
- S
  Sharon CookAug 5, 2025
  If the MT compressor of your SCM Heat Pump isn't starting, there could be several reasons: * A blocking alarm might be active. Check for any active alarms and try resetting them. * The unit's regulation status might be OFF. Ensure the unit is switched ON. * Most of the evaporators might be undergoing defrosting. Verify the Defrost setting on mask FBB15, but only if evaporator controllers connect to the CDU via RS485. * It might be necessary to force the download settings from the Hecu Controller to the PSD (power+ driver).
P
patrickdelgadoAug 12, 2025
How to troubleshoot missing communication in SCM Heat Pump?
- T
  Tony FosterAug 12, 2025
  To troubleshoot missing communication in your SCM Heat Pump, consider the following: * Check the PSD power supply to ensure it is powered (power+/Inverter)/ HECU controller and PSD. * Verify the RS485 wiring between the HECU and PSD. * Confirm the serial address set in the PSD using the dip switch configuration.
M
Mary FosterAug 19, 2025
Why is there missing communication between Hecu and evaporators in my SCM CUBO2 SMART?
- C
  Christopher MartinAug 19, 2025
  Missing communication between the Hecu and evaporators in your SCM Heat Pump can occur due to: * Incorrect RS485 wiring/connection between the Hecu and evaporators. Check these connections. * An incorrect serial address setting in the evaporator controller (MPXPRO/ULTRACELLA). Verify the serial address.
W
Wesley MayAug 28, 2025
How to fix probes alarm or wrong connection in SCM CUBO2 SMART Heat Pump?
- C
  christianbergerAug 28, 2025
  To resolve probe alarms or wrong connections in your SCM Heat Pump: * Check the probe connection and reading. * Verify the probe configuration, including the range (for pressure probes), the type of probe, and wirings. * Ensure correct probe placement and range (min and max). * Compare the value read by the probe with the value read by a manometer. * If the issue persists, the probe might be broken.

Summary

Introduction

Safety issues with CO2 - Safe handling

Precaution

Safety measures and warnings for handling CO2 refrigerant and the unit.

Unit description & Main components

Unit installation

Piping details

Pipe Connections (Multi-Split)

Recommended piping setup for connecting multiple evaporators.

Oil traps

Guidelines for installing oil traps in piping for proper oil return.

Test and inspection before start-up

Control of the unit tightness

Procedures for leak testing the refrigeration system before operation.

Preliminary controls according to EN 60204-1, visual controls

Electrical safety checks and visual inspections before startup.

Management of the system. Configuration of the controllers

How the Carel controller manages system parameters and operations.

Inspection of the gas cooler

Ensuring proper airflow and cleanliness of the gas cooler for efficient operation.

Earth connection

Requirements and responsibilities for grounding the unit properly.

Commissioning

Evacuation and pre-charge

Steps for vacuuming the system and initial refrigerant pre-charging.

VACUUM, SW function details

Explains the software function for opening valves during the vacuum process.

Refrigerant & Oil Charging

Procedures for adding refrigerant and oil to the system.

Oil charge

Details on the initial oil charge and how to add more if needed.

Procedure for additional oil refill

Step-by-step guide for refilling the compressor oil.

Estimation of the refrigerant charge

Methods and charts to calculate the required CO2 refrigerant quantity.

Charging procedure

Instructions on how to safely charge the system with CO2 refrigerant.

User Interface and main Software features

User Interface

Description of the control panel display, buttons, and LED indicators.

On;Off unit

Steps to switch the unit's regulation on and off via the user interface.

Regulation set point

How to set and manage regulation parameters like suction pressure setpoints.

MPXPRO and ULTRACELLA;EVO CAREL configuration.

Setting up communication and configuration with evaporator controllers.

MPXPRO and ULTRACELLA;EVO CAREL regulation

Details on how these controllers manage regulation parameters.

Serial Communication (PSD drivers, Evaporators and Supervisory System)

Communication with evaporators (features and requirements)

Benefits and compatibility for serial communication with evaporators.

Serial connections and wirings

Diagrams and notes for serial communication wiring between components.

Recommended Annual Checks

List of alarms

Hecu alarm

Description and actions for alarms generated by the HECU controller.

PSD (Power+) alarm code

Explains alarm codes related to the PSD (inverter) and their causes/solutions.

PSD led status

How to interpret the LED indicators on the PSD for diagnosing issues.

Troubleshooting

Compressor Envelope

Refrigerant drawing (P&I)

HECU Controller layout

Terminals blocks connection

Dimensional drawing

General information and limits

Electrical details

Cooling capacity Table

Conversion pressure-temperature CO2 (R744)

Note

SCM CUBO2 SMART Specifications

General

Brand	SCM
Model	CUBO2 SMART
Category	Heat Pump
Language	English