Air Source Heat Pump Installation

What is an Air Source Heat Pump?

The air-source heat pump is a system that takes part of the energy that meets your heating, cooling and hot water needs from a part of renewable energy through electricity. It is usually preferred in places where there is a need for housing and hot water. Where hot water is not needed, they may be preferred only for heating or cooling purposes. If you purchase an air-source heat pump assembly and do not install it after installation, the assembly will be supplied by you. In fact, the installation process of the air source heat pump is simple and the heat pump becomes operational within a few hours.

In this article, installation of air welded assembly will be explained by taking Ekotec Energy 17kW air source heat pump as an example.

Before Installation

The decision of which functions of the heat pump should be used should be made in advance.The reason is that if the heating, cooling and hot water requirements are all eliminated, the type of material and connection to be used will change, and if heating and cooling are used, the installation and connection will vary.

Air Source Heat Pump

Heat transfer equipment (radiator, floor heating, fancoil, etc.) must be selected and connected to the premises to be pre-conditioned.

How to Install Air Source Heat Pump Assembly?

Electrical connection

Before making the electrical connection, the electrical cable is pulled to the required cable thickness according to the power of the heat pump to be connected and a suitable fuse is installed.

ModelVoltagePowerCable cross sectionInsurance
17 kW380 V(Three phase)Heating3.82 kWCooling4,45 kW3 * 6 mm 2 + 2 * 2.5 mm 232A

The air source heat pump is connected to the heat pump after the fuse and cable have been drawn according to the above table.

Heat Pump Terminal Connection

The terminal connection is connected as red – R phase, yellow – S phase, green – T phase, blue – neutral and ground, as shown above.

Circulation Pump and Flow Switch Connection

The circulation pump cable must be withdrawn and the cable used is 2 × 1.5 mm. The connection of the pump circulating through the heat pump from the heat pump to the yellow and blue connection of the contactor that writes the circulation pump in the figure is done.

If there is no flow switch connection after the connection of the circulation pump, connections 1 and 2 are bridged.

When the flow switch is connected to the heat pump outlet water, one end is connected to the first end and the second end to the second end.

Connections 3 and 4 are redundant electrical heater connections. The spare electric heater feature is used to boost efficiency in cold weather, but often this is not necessary.

Sensor Connection

You askTemperature Value
CN3Heat Pump Inlet (Cold)
CN4Heat Pump Output (Hot)
CN5Outside Air Temperature
CN6ACondenser Coil Temperature Sensor
CN8Heated Water Temperature (Boiler)
CN9Gas Emptying Temperature Sensor
CN11Control Board Connection

Then the sensors inside the heat pump are connected. The plastic tip sensor measures the outside air temperature and is connected to the (CN5) on the card. This sensor is pulled out of the pump to measure the outside air temperature. The copper-tipped sensor is retracted in the west.It is connected to the sensor (CN8) and measures the temperature of the heated water in the boiler. The latest control panel connection is made (CN11) and the system is energized.

When any sensor fault is detected in the control panel, the table and the picture above shows which sensor is in the cause of the fault.

3 Way Valve Connection

The purpose of using the heat pump is not to require a three-way valve if only heating and cooling are used. However, if hot water is needed, a three-way valve is needed.

Four-Way Valve: It is a switch operating with 220 volts. The duty system provides gas transfer by opening the valve that is connected to operate in the heating mode. The 4-way valve has 2 wires.One is attached to the brown cable on the electronic board, which writes 4WV. The other is the Neutral Cable. Since the 4-way valve works with 220 Volts, the disconnection must be made after the system is switched off.
Pressure Sensors: Low and High pressure switches operate with approximately 12 Volts DC.Working system; One input of the switch with 2 inputs is connected to HP-1 and LP-1 on the 12-volt other-end card. If the pressure rises or falls, the switch opens and the voltage does not fall where the connection in the card is, so that the system detects that the pressure switches have changed position and goes to the fault.

Compressor: It is the device that enables the heat pump to operate. The compressor operates the COMP1 contactor on top of the pump.

Phase Control Board: The phase control board controls whether the connected phases are correct. If the phases are wrong, the system does not switch on the control panel although the compressor and circulation pumps appear to be in circuit. When the phases are correctly connected, the system works correctly.

System Settings (Jumper Settings)

With the jumper settings, the heat pump features can be activated.

When installing the air source heat pump, only the X1 Jumper should be removed and all other jumpers should be installed.

No Jumper (No Link)Jumper Plugged (Connected)
X1Transaction definition.User editing is not allowed.
X2Two Compressor ModuSingle Compressor Mode

Caution: The jumper settings must be made after the system has completely cut off the electricity and the system should be powered 30 seconds after the settings are made.

Unit Errors and Precautions  

01Input water temperature sensor failureAll outlets are closed.
02 Outlet water temperature sensor failureAll outlets are closed.
03 Ambient air temperature sensor failureAll outlets are closed.
04 Evaporator coil temperature sensor 1failureAll outlets are closed.
05 Evaporator coil sensor 1failureAll outlets are open.
06FLOWERInsufficient water flowAll outlets are closed.
07HP1High pressure protection – Compressor 1Compressor 1 off.
08LP1Low pressure protection – Compressor 1Compressor 1 off.
09HP2High pressure protection – Compressor 2Compressor 2 is off.
10LP2Low pressure protection – Compressor 2Compressor 2 is off.
11th Heated water, temperature sensor malfunctionAll outlets are closed.
12UV1Compressor 1 overloadCompressor 1 off
13UV2Compressor 2 overloadCompressor 2 off
14Winter antifreeze protection 
15Very high outlet water temperaturetemperatureCompressor off
16SETVery low outlet water temperaturetemperatureCompressor off
17 Gas discharge temperature sensor 1failureAll exits are closed
18 Gas discharge temperature sensor 2failureAll exits are closed
19 Communication ErrorAll exits are closed
20 Gas discharge temperature 1 too high Compressor 1 off
21 Gas discharge temperature 2 too high Compressor 2 off
22BUSUnified faultAll exits are closed

If the error is displayed on the screen after correcting the error, the system will switch off the electricity and turn it on again.

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