MTA HAST 070 N - User Manual

Questions and Answers

M
meadowsjoshuaAug 3, 2025
Why is my MTA HAST 070 N showing a high pressure error?
- J
  John FordAug 3, 2025
  If your MTA Heat Pump is showing a high pressure error, several factors could be the cause. First, check the fans to ensure they are functioning correctly and rotating in the right direction; repair or replace them if needed, or invert two of the phase wires of the fan power supply. Secondly, prevent warm air from recirculating by repositioning the unit or removing any nearby obstructions. Also, inspect the coil for fouling and clean the condenser fins if necessary. Finally, ensure that the thermal load is within the prescribed limits.
M
matthew34Aug 10, 2025
How to troubleshoot an MTA HAST 070 N that fails to start?
- K
  Kyle RichardsonAug 10, 2025
  If your MTA Heat Pump unit fails to start, there are several possible reasons. First, check for any active shut-down alarms that might be preventing the unit from starting. If the unit is programmed to run by time band, activate start mode outside of those time bands in the User stage. Also, verify that supervision is not enabled by entering the supervision stage and disabling the supervision function. Finally, ensure that remote control is disabled to allow the unit to start.
J
jhoustonAug 26, 2025
Why is there insufficient water pressure at the outlet of the pump in my MTA HAST 070 N?
- L
  Larry WilliamsAug 27, 2025
  If there's insufficient pressure head at the outlet of the pump in your MTA Heat Pump, it could be due to a few reasons. If the water flow rate is too high, restore it to within prescribed limits, perhaps by partially closing a pump delivery cock. If there is ice in the evaporator, stop the unit, leave the pump running, edit the set-point value and add ethylene glycol to the water. Also, if the evaporator is blocked, supply a high flow rate of water in countercurrent conditions and install a filter upline from the unit.
D
Derek MartinNov 16, 2025
What to do if the water outlet temperature is higher than set-point in my MTA Heat Pump?
- K
  Kenneth StevensonNov 16, 2025
  If the water outlet temperature of your MTA Heat Pump is higher than the set-point, several issues could be responsible. You can increase the hydraulic circuit pressure drop, for example, by partially closing a pump discharge valve, if the water flow rate is too high. If the thermal load is too high, restore it to within prescribed limits. If the ambient temperature is too high, increase air recirculation. Clean the condenser fins if they are fouled and remove any obstructions from the front surface of the condenser. Invert the position of two of the three phase wires of the power supply if the fan rotation is incorrect. If the circuit has insufficient refrigerant charge, call a qualified refrigeration engineer to check for and eliminate any leaks and have the circuit charged. Finally, if ...

Summary

QUICK GUIDE

Power Up and Power Down

Instructions for powering the unit on and off.

Controller Keys

Explanation of the controller's key functions.

Setpoint Adjustment

Procedure for modifying the unit's setpoint values.

Alarm Management

How to view and interpret active alarms on the unit.

GENERAL INFORMATION

Model and Code Interpretation

Guide to understanding the unit's model designation and codes.

Data Plate and Conformity

Information on the unit's data plate and declaration of conformity.

Performance and Noise Data

Details on performance specifications and noise levels.

SAFETY

General Safety Guidelines

General safety instructions for all personnel interacting with the unit.

Precautions and Refrigerant Safety

Precautions for operation, maintenance, disposal, and refrigerant handling.

DESCRIPTION

Operating Principle

Explanation of how the unit functions in chiller and heat pump modes.

Unit Components

Detailed description of the unit's main components.

Hydraulic System

Details on the optional hydraulic system components.

INSTALLATION

Installation Foreword and Symbols

Introduction to installation and explanation of symbols used.

Installation Procedure

Procedures and considerations for proper unit installation.

START-UP

Start-up Procedure

Step-by-step guide for initial unit start-up and checks.

ELECTRONIC CONTROLLER

Technical Features

Overview of the controller's hardware and capabilities.

Display Operation

Navigating and interacting with the unit's display interface.

I;O Menu

Displaying input/output values and device status.

Setpoints Menu

Setting and editing temperature setpoints for unit operation.

User Menu

Configuring user-specific settings like autostart, language, and display.

Alarm Menu

Viewing and managing unit alarms and warnings.

Reserved Menu Access

Accessing advanced operational parameters requiring passwords.

FUNCTIONS AND COMPONENTS OF THE UNIT

Electronic Thermostatic Valve

Details on the optional electronic thermostatic valve.

Pressure Switches and Transducers

Information on high-pressure switches and transducers.

Flow Switch, Level Sensor, and Ventilation

Function of flow switch, level sensor, and electrical board ventilation.

Antifreeze Control

How the unit prevents freezing in the hydraulic circuit.

OPERATION AND MAINTENANCE

Basic Operation

Basic operational guidelines for the unit.

Maintenance Procedures

Procedures for accessing compartments and performing maintenance.

TROUBLESHOOTING

Unit Start-up and Operational Issues

Common problems related to unit starting and basic operation.

Performance and Pressure Issues

Troubleshooting performance deviations and pressure anomalies.

Component and System Faults

Diagnosing issues with fans, pumps, transducers, and control systems.

RISK ANALYSIS: RESIDUAL RISK

Residual Risk Assessment

Identification and assessment of residual risks associated with the unit.

APPENDIX

Sound Level Measurements

Data on sound pressure and power levels for various models.

Settings Table

List of editable parameters and their default values.

Alphanumeric String Explained

Explanation of the alphanumeric code on the unit's data plate.

Refrigerant Safety Data Sheet

Safety information and properties of the refrigerant used.

Operational Checklists

Checklists for general conditions, first start, hydraulic circuit, controller, and oil.

MTA HAST 070 N Specifications

General

Brand	MTA
Model	HAST 070 N
Category	Heat Pump
Language	English

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