SystemAir MUB Series

Questions and Answers:

A
Andrew CampbellJul 27, 2025
Why is the SystemAir Air Conditioner's air output too low?
- S
  Spencer LeeJul 27, 2025
  The air output of your SystemAir air conditioner might be too low due to several reasons. The rotor could be rotating in the wrong direction; in this case, change the rotation direction if possible. Alternatively, pressure losses might be too high, so optimize the line routing. Also, check if the flow regulators are fully open. Finally, the intake or pressure ducts could be blocked, so remove any blockages.
P
Paul HopkinsJul 31, 2025
What to do if the SystemAir Air Conditioner motor does not rotate?
- E
  edwin03Jul 31, 2025
  If the motor of your SystemAir air conditioner isn't rotating, there are a few things to check. First, verify the supply voltage and re-establish it if necessary. Second, inspect the connection for any faults and correct it, after disconnecting from the power supply. Lastly, the temperature monitor might have been triggered; allow the motor to cool down and then identify and resolve the cause of the fault.
B
bradley00Aug 4, 2025
How to fix a SystemAir Air Conditioner fan that does not run smoothly?
- J
  Julie AyalaAug 4, 2025
  If your SystemAir air conditioner fan isn't running smoothly, consider these potential causes: a rotor imbalance (rebalancing by a specialist company is recommended), soiling on the rotor (clean carefully and rebalance), material decomposition on the rotor due to aggressive material conveyed (contact Systemair), the rotor rotating in the wrong direction (change direction of rotation if possible, otherwise contact Systemair), deformation of rotor due to excessive temperature (ensure that the temperature does not exceed the certified value/install new rotor), or vibrations/oscillations (check the installation of the fan/check the duct system).
B
Brian ChanAug 9, 2025
What to do if thermal contacts/resistors have triggered in SystemAir Air Conditioner?
- M
  Mr. Kenneth Pennington Jr.Aug 9, 2025
  If the thermal contacts or resistors in your SystemAir air conditioner have triggered, it could be due to several reasons. The rotor might be rotating in the wrong direction; change the rotation direction if possible, otherwise contact Systemair. The motor might be overheated; check the cooling impeller (if used), measure the motor winding (if possible) or contact Systemair. The capacitor (if used) might not be connected correctly; connect the capacitor correctly. The motor might be blocked; in that case, contact Systemair.
D
Douglas ButlerAug 13, 2025
Why SystemAir Air Conditioner fan does not reach nominal speed?
- S
  Stephanie DavisAug 13, 2025
  If your SystemAir air conditioner fan isn't reaching its nominal speed, the possible causes include: a defective motor winding, improperly aligned drive motor (in both cases contact Systemair), incorrectly set control units (such as frequency converter or transformer, so correct their settings), or a mechanical blockage (remove the blockage).
W
William HughesAug 17, 2025
Why are the electronics or motor of my SystemAir Air Conditioner overheated?
- K
  kim14Aug 17, 2025
  If the electronics or motor of your SystemAir air conditioner are overheating, it could be due to insufficient cooling (improve cooling), an overloaded motor (check if the correct fan is used for your application), or an ambient temperature that's too high (check if the correct fan is used for your application).
B
Brandon MedinaAug 21, 2025
How to stop grinding sounds in SystemAir Air Conditioner when starting or operating the fan?
- N
  Nicholas SkinnerAug 21, 2025
  To address grinding sounds when starting or operating the fan of your SystemAir air conditioner, loosen the duct connection (inlet side) and realign it.

SystemAir MUB Series Specifications

General

Brand	SystemAir
Model	MUB Series
Category	Air Conditioner
Language	English

Summary

General Information

Notice and Instruction Symbols

Explains the meaning of danger, warning, caution, and note symbols used in the manual.

Personnel and Safety Precautions

Details required personnel qualifications and general safety instructions for fan operation.

Warranty and Logistics

Warranty Claims and Conditions

Outlines the terms and conditions for warranty claims and product support.

Delivery, Transport, and Storage Safety

Safety guidelines for handling, transporting, and storing the fans to prevent damage.

Delivery, Transport, and Storage Procedures

Delivery and Transport Procedures

Covers checks for delivery completeness, transport damage, and unpacking instructions.

Storage Guidelines

Provides recommendations for storing fans in a dry, dust-free location, avoiding extreme temperatures.

Product Series Descriptions

MUB Fan Series Overview

Covers MUB fans with EC/standard motors, dimensions, and technical data, including airflow.

MUBT and MUBT-S Fan Series

Details MUB/T and MUB/T-S fans, their motors, airflow, dimensions, and technical data.

MUB-CAVVAV Fan Series Functions

Information on MUB-CAV/VAV fans, including constant air volume and pressure functions.

MUB-CAVVAV Control Module

Details the sensor control module for differential pressure and volume (PCA1000/6000D2).

MUB-CAVVAV Dimensions and Data

Presents dimensions and technical data for MUB-CAV/VAV fan models.

MUBF Fan Series Overview

Covers MUB/F fans, high-temperature motors, dimensions, and technical data for smoke extraction.

MUBF Dimensions and Technical Data

Presents dimensions and technical data for MUB/F fan models, including temperature resistance.

Motor Data and Intended Use

Explains motor data, intended applications, and usage guidelines for all MUB models.

Incorrect Use Warnings

Lists hazardous and incorrect applications of the fans, emphasizing safety risks.

Fan Identification and Accessories

Name Plate and Type Key Interpretation

Guide to understanding fan designation, model numbers, and identifying key specifications from the name plate.

Accessories for MUB, MUBT, MUBT-S, MUB-CAVVAV

Lists and describes accessories for MUB, MUB/T, MUB/T-S, MUB-CAV/VAV fan series.

Accessories for MUBF

Lists and describes accessories for MUB/F fans, including silencers and connection types.

Installation Procedures

Installation Safety and Preconditions

Critical safety warnings and essential requirements before commencing fan installation.

Installation Variations for MUBT and MUBT-S

Details permissible mounting positions for MUB/T and MUB/T-S models.

Installation Variations for MUB and MUB EC

Details permissible mounting positions for MUB and MUB EC models.

Changing Discharge Direction

Instructions on how to change the discharge direction for MUB/T and MUB/EC fans.

Weather Protection and Shafts

Weather Protection Roof Installation

Steps for installing the weather protection roof (WSD) to protect the motor from moisture.

Shaft Extension Procedures

Guidelines for attaching shaft extensions and dealing with potential rotor damage.

Rotor Assembly and Hubs

Steel Shaft Extension Steps

Detailed steps for disassembling and assembling steel shaft extensions.

Rotor Hub and Clamping Bush

Procedures for handling screw-down hubs and taper clamping bushes for rotor attachment.

Electrical Connection Procedures

Electrical Connection Safety and Wiring

Essential safety guidelines, preconditions, and connection steps for electrical wiring.

Electrical Details and Commissioning

Cable Entry, Grounding, and Motor Protection

Covers cable bushing, protective grounding, circuit breakers, and motor protection for fans.

Variable Speed Fans and Commissioning Tests

Safety, preconditions, and initial tests for commissioning the fan for standard and EC motors.

Operation and EC Motor Commissioning

EC Motor Commissioning Tests

Specific tests for EC motor fans during commissioning, including rotation and current checks.

Operation Safety and Preconditions

General safety guidelines and preconditions for operating the fan safely.

Troubleshooting and Maintenance Safety

Safety for Service Work

Safety precautions for personnel performing troubleshooting or maintenance on the fan.

Troubleshooting Common Fan Issues

Identifies common fan problems, their causes, and provides solutions for smooth operation.

Fan Maintenance and Service Intervals

Recommends periodic maintenance activities and checks to ensure fan reliability and longevity.

Spare Parts, Cleaning, and Disposal

Spare Parts and Cleaning Procedures

Procedures for obtaining spare parts, safe cleaning methods, and fan maintenance.

Deinstallation and Disposal Guidelines

Instructions for safely dismantling and disposing of fan components according to regulations.

EU Declaration of Conformity - Multibox

Multibox Compliance Details

Manufacturer's statement confirming Multibox compliance with relevant EU directives and harmonized standards.

EU Declaration of Conformity - Thermo Fans

Thermo Fans Compliance Details

Manufacturer's statement confirming Thermo fans compliance with relevant EU directives and harmonized standards.

EU Declaration of Conformity - Smoke Extract Fans

Smoke Extract Fans Compliance Details

Manufacturer's statement confirming Smoke extract fans compliance with EU directives and standards.

ERP Guidelines and MUB Product Fiche

ERP Guidelines for Ventilation Units

Explains ERP regulations (Reg. 1253/2014) for ventilation units and their operating modes.

MUB Fan Product Specifications

Provides detailed technical data and specifications for various MUB fan models.

MUB Series Technical Data

Presents further detailed technical data and specifications for MUB fan product series.

Product Fiche MUB EC

MUB EC Fan Product Specifications

Presents detailed technical data and specifications for MUB EC fan models.

Product Fiche MUB-CAVVAV

MUB-CAVVAV Fan Product Specifications

Presents detailed technical data and specifications for MUB-CAV/VAV fan models.

Commissioning Report

Reporting Installation and Operational Data

Forms for recording fan details, operational data, and commissioning success.

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