Please read the following safety precautions carefully.
Precautions that must be observed to prevent injuries or death.
Mitsubishi Electric is not responsible for the failure of locally-supplied and ﬁ eld-supplied parts.
Be sure to perform periodical maintenance.
Be sure to follow your local regulations.
Be sure to follow the instructions provided in this manual.
The hydrobox and outdoor units must not be installed, disassembled, relocated, altered or repaired by the user. Ask an authorised installer or technician. If the
unit is installed improperly or modiﬁ ed after installation by the user water leakage, electric shock or ﬁ re may result.
The outdoor unit should be securely ﬁ xed to a hard level surface capable of bearing its weight.
The hydrobox should be positioned on a hard vertical surface capable of supporting its ﬁ lled weight to prevent excessive sound or vibration.
Do not position furniture or electrical appliances below the outdoor unit or hydrobox.
The discharge pipework from the emergency/safety devices of the hydrobox should be installed according to local law.
Only use accessories and replacement parts authorised by Mitsubishi Electric ask a qualiﬁ ed technician to ﬁ t the parts.
All electrical work should be performed by a qualiﬁ ed technician according to local regulations and the instructions given in this manual.
The units must be powered by a dedicated power supply and the correct voltage and circuit breakers must be used.
Wiring should be in accordance with national wiring regulations. Connections must be made securely and without tension on the terminals.
Earth unit correctly.
Keep children and pets away from both the hydrobox and outdoor units.
Do not use the hot water produced by the heat pump directly for drinking or cooking. This could cause illness to the user.
Do not stand on the units.
Do not touch switches with wet hands.
Annual maintenance checks on both the hydrobox and the outdoor unit should be done by qualiﬁ ed person.
Do not place contains with liquids in on top of the hydrobox. If they leak or spill onto the hydrobox damage to the unit and/or ﬁ re could occur.
Do not place any heavy items on top of the hydrobox.
When installing or relocating, or servicing the hydrobox, use only the speciﬁ ed refrigerant (R410A) to charge the refrigerant lines. Do not mix it with any other
refrigerant and do not allow air to remain in the lines. If air is mixed with the refrigerant, then it can be the cause of abnormal high pressure in the refrigerant
line, and may result in an explosion and other hazards.
The use of any refrigerant other than that speciﬁ ed for the system will cause mechanical failure or system malfunction or unit breakdown. In the worst case, this
could lead to a serious impediment to securing product safety.
In heating mode, to avoid the heat emitters being damaged by excessively hot water, set the target ﬂ ow temperature to a minimum of 2ºC below the maximum
allowable temperature of all the heat emitters. For Zone2, set the target ﬂ ow temperature to a minimum of 5ºC below the maximum allowable ﬂ ow temperature
of all the heat emitters in Zone2 circuit.
Use clean water that meets local quality standards on the primary circuit.
The outdoor unit should be installed in an area with sufﬁ cient airﬂ ow according to the diagrams in the outdoor unit installation manual.
The hydrobox should be located inside to minimise heat loss.
Water pipe-runs on the primary circuit between outdoor and indoor unit should be kept to a minimum to reduce heat loss.
Ensure condensate from outdoor unit is piped away from the base to avoid puddles of water.
Remove as much air as possible from water circuit.
Refrigerant leakage may cause suffocation. Provide ventilation in accordance with EN378-1.
Be sure to wrap insulation around the piping. Direct contact with the bare piping may result in burns or frostbite.
Never put batteries in your mouth for any reason to avoid accidental ingestion.
Battery ingestion may cause choking and/or poisoning.
Install the unit on a rigid structure to prevent excessive sound or vibration during operation.
If power to the hydrobox is to be turned off (or system switched off) for a long time, the water should be drained.
Preventative measures should be taken against water hammer, such as installing a Water Hammer Arrestor on the primary water circuit, as directed by the manu-
In order to prevent condensation on emitters, adjust ﬂ ow temperature appropriately and also set the lower limit of the ﬂ ow temperature on site.
Precautions that must be observed to prevent damage to unit.