Midea M-thermal Manual

• Installing the equipment in any of the following places may lead to malfunction of the equipment (if it is inevitable, consult the supplier):
• The site contains mineral oils such as cutting lubricant. Seaside where the air contains much salt.
• Hot spring area where corrosive gases exist, e.g., sulfide gas. Factories where the power voltage fluctuates seriously.
• Place like kitchen where oil permeates.
• Place where strong electromagnetic waves exist.
• Place where acid or alkali gases evaporate.
• Other special environments.

• When install the main unit, please set a drain valve at the drain orifice of the unit by self.
• Pipeline Connection Explanation
• Installation of the water inlet or outlet pipes: The spec of the water inlet or outlet thread is G3/4" (internal thread). Pipes must be insulated and durable.
• Installation of the pipe for TP valve: The spec of the valve connecting thread is RC3/4" (internal thread). After installation, it must be confirmed that the drainpipe outlet is exposed in the air. When flexible drainpipe is jointed to the pressure relief orifice of this valve, it must be confirmed that the flexible drainpipe is downwards vertically and exposed in the air.
• To avoid backsiphonage, it is required to install a non-return valve on thewater inlet of the domestic hot water tank in accordance with the applicable legislation.

Explosive material

• The handle of TP Valve should be pulled out once per half year, to make sure that there is no jam of the valve.
• Please beware of burn, because of the high temperature of water.
  
• Do not pull on the handle of TP Valve. Do not dismantle the TP Valve.
• The drainage pipe should be well installed, in order to avoid freezing up in cold weather.
• Do not block off the drainage pipe.
• It will cause explosion and injury, if do not comply with the above instruction.
• Installation of the One Way Valve: The spec of the One Way Valve thread in accessories is RC3/4". It is used to prevent backflow of water.
• Installation of the Strainer: The spec of the Strainer thread in accessories is RC3/4". It is used to filtrate inlet water.
• After all the pipes installed turn on the cold water inlet and hot water outlet and start effusing the tank. When there is water normally flowing out from water outlet, the tank is full. Turn off all valves of outlet pipes and check all pipes. If there is any leakage, please repair it.
• If the inlet water pressure is less than 0.15 MPa, a pressure pump should be installed at the water inlet.
• For guarantee the long safety using age of tank at the condition of water supply hydraulic higher than 0.5MPa, a reducing valve should be mounted at the water inlet pipe.

NOTE
The above curves are the water resistance of this product under different flow rates, all resistance of the whole water system should not exceed the head of the pump
NOTE

• The total system (Indoor unit and outdoor unit) is designed for combination with a domestic hot water tank. In case another tank is being
• Used in combination with the indoor unit, we cannot guarantee neither good operation nor reliability of the system. For those reasons we cannot give warranty of the system in such case.
• Only this tank can be used in combination with the solar kit option.
• Domestic hot water quality must be according to EN directive 98/83 EC.
• A drain device should be installed on the cold water connection on the domestic hot water tank.
• It is important that the storage capacity of the domestic hot water tank meets normal daily fluctuations in consumption of domestic hot water without any fall of the water outlet temperature during use.
• Immediately after installation, the domestic hot water tank must be flushed with fresh water. This procedure must be repeated at least once a day the first 5 consecutive days after installation.

For safety reasons, it is not allowed to add ethylene glycol to the water circuit. Adding ethylene glycol might lead to contamination of the domestic water if a leakage would occur in the heat exchanger coil.

• In case of limited consumption of domestic hot water.
• e.g. At holiday residences or at houses that are occasionally not occupied, the domestic hot water tank installation must be fitted with a circulation pump.
• The circulation pump can be time-controlled.
• The circulation pump must operate to circulate the complete volume of the domestic hot water tank 1.5 times per hour.
• And the circulation pump must operate or be programmed for operation. during 2 uninterrupted hours per day at least.

• A main or other means for disconnection, having a contact act separation in all poles, must be incorporated in the fixed wiring in accordance with relevant local and national legislation.
• All field wiring and components must be installed by a licensed electrician and must comply with relevant European and national regulations.
• The field wiring must be carried out in accordance with the wiring diagram supplied with the unit and the in-structions given below.
• The domestic hot water tank must be earthed via the indoor unit.
  Power circuit and cable requirements.

• Be sure to use a dedicated power circuit. Never use a power circuit shared by another appliance.
• Use one and same dedicated power supply for the outdoor unit, indoor unit, backup heater and domestic hot water tank.
  For cable requirements and specifications. refer to "Field wiring" in the indoor unit installation manual.

NOTE
Select the power cable in accordance with relevant local and national regulations.

• Make sure all field wiring is insulated from the tank body and heater element or can resist temperatures to 90°C.
• Thermistor cable
  The distance between the thermistor cable and power supply cable must always be at least 5 cm to prevent electromagnetic interference on the thermistor cable.
• Procedure of Electric Wiring Illustration

• Switch off the power supply before making any connections.

TROUBLE SHOOTING

This section provides useful information for diagnosing and correcting certain troubles which may occur in the unit.

General guidelines

Before starting the trouble shooting procedure, carry out a thorough visual inspection of the unit and look for obvious defects such as loose connections or defective wiring.
Before contacting your local dealer read this chapter carefully, it will save you time and money.

When carrying out an inspection on the supply panel or on the switch box of the unit, always make sure that the Circuit breaker of the unit is switched off.
When a safety device was activated, stop the unit and find out why the safety device was activated before resetting it. Under no circumstances safety devices may be bridged or changed to a value other than the factory setting. If the cause of the problem cannot be found, call your local dealer.

General symptoms

• Symptom 1:Intermittent water dischange
  Table.9-1

  POSSIBLE CAUSES	CORRECTIVE ACTION
  The main water supply is off	Check that all shut off valves of the water circuit are completely open.

• Symptom 2: water from hot taps is cold
  Table.9-2

  POSSIBLE CAUSES	CORRECTIVE ACTION
  Thermal control failure	When discharge has stopped, check thermal controls, if the fault occurs, contact your local dealer for a replacement.

SAFETY PRECAUTIONS

Safely sign
Please thoroughly read and ensure that you fully understand the safety precautions (including the signs and symbols) in this manual, and follow relevant instructions during use to prevent damage to health or property.

indicates a hazard with a high level of risk which, if not avoided, will result in serious injury.

indicates a hazard with a medium level of risk which, if not avoided, could result in serious injury.

indicates a hazard with a low level of risk which, if not avoided, could result in minor or moderate injury.
NOTE
indicates a non-hazard risk which, if not avoided, may result indecreased device performance, abnormal functions, or damage to the device or property.

Symbols on the unit

	Read operation manual carefully first before any further action.
	Only the specialist is allowed to take action under the instruction of the installation manual.
	The information is available in the relevant documentation

Target group

• Ask the professional installer for installation of the air source heat pump water heating units, improper installation may result in water leakage, electric shock, or fire.
• Ask the professional service person for the repair and maintenance. Improper repair and maintenance may result in water leakage, electric shock or fire.
• In order to avoid electric shock, fire or injury, if any abnormality is detected, such as smell of fire, turn off the power supply and call your service agent for instructions.

• Never use the wire and fuse with wrong rated current, it may cause the unit to break down or a fire.
• The appliance shall be installed in accordance national wiring regulations.
• If the supply cord is damaged, it must be replaced by the manufacturer or its service agent or a similarly qualified person in order to avoid a hazard.
• This appliance can be used by children aged from 8 years and above and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved. Children shall not play with the appliance. Cleaning and user maintenance shall not be made by children without supervision.