Daikin MPS020B - User Manual

Questions and Answers

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Denise MillerJul 25, 2025
What to do if my Daikin MPS020B Heat Pump unit will not run?
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  Julian MartinJul 25, 2025
  If your Daikin Heat Pump unit won't run, there are several potential causes: * A power issue: check for correct voltage at the compressor contactor in the control box, or replace blown fuses. * Thermostat calibration: try resetting the thermostat if it's set too high. * Contactor failure: check for 24 volts at the contactor coil and replace it if the contacts are open. * Transformer issue: check the wiring and replace the transformer if it's defective. * High pressure control: reset it, noting that it opens at 450 PSIG. See also High Head Pressure Remedy. * Damaged low voltage wiring: replace the thermostat wiring.
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Emily MooreAug 5, 2025
Why is my Daikin Heat Pump providing insufficient cooling?
- M
  Misty NguyenAug 5, 2025
  Insufficient cooling in your Daikin Heat Pump can stem from several issues: * Incorrect unit size: recalculate the load to ensure the unit is appropriately sized. * Improper airflow: verify airflow is approximately 400 CFM per ton. * Refrigerant issues: charge the unit per the procedure attached to the service panel, or recover refrigerant to evacuate and recharge, adding a filter drier if there's air, non-condensables, or moisture in the system. * Voltage problems: ensure voltage at the compressor terminals is within 10% of the rating plate volts when the unit is operating.
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Lisa PerryAug 14, 2025
What to do if the condenser fan runs, but the compressor doesn’t in my Daikin Heat Pump?
- A
  Aaron WelchAug 14, 2025
  If the condenser fan runs but the compressor doesn’t in your Daikin Heat Pump, consider these possibilities: * Loose connection: check for correct voltage at the compressor and tighten all connections. * Compressor issue: wait at least 2 hours for overload to reset. If still open, replace the compressor, as it may be stuck, grounded, have an open motor winding, or an open internal overload. * Low voltage: at compressor terminals, voltage must be within 10% of rating plate volts when unit is operating. You may need to add start kit components.

Summary

Introduction

Safety Precautions

Manufacturer's warnings and notices for safe installation and operation.

Mechanical Installation

Pre-Installation Requirements

Critical checks and conditions to meet before unit installation.

Installation Procedures

Ducting and Connections

Instructions for ductwork, gas piping, and condensate drain connections.

Electrical Installation

Power Supply and Wiring

Guidelines for power supply, branch circuit disconnects, and field wiring.

Wiring Diagrams

Accessories

Economizer Systems

Dampers and Exhaust Systems

Controls and Operation

Furnace Controls and Operation

Overview of furnace control system and normal operating sequences.

Cooling Section Operation

Maintenance

Furnace Section Maintenance

Cooling Section Maintenance

System Charge Charts

Charts for determining correct refrigerant charge based on operating conditions.

Troubleshooting

Cooling Troubleshooting

Guides for diagnosing and resolving common cooling system issues.

Furnace Troubleshooting

Flowcharts to diagnose and fix furnace operational problems.

Daikin MPS020B Specifications

General

Model	MPS020B
Category	Heat Pump
Cooling Capacity (kW)	2.0
Heating Capacity (kW)	2.5
Power Supply	220-240V, 50Hz
Refrigerant	R32
Operating Temperature Range (Heating)	-15°C to 24°C