Safety Precautions - Toshiba HWS-G1901CNMR-E Service Manual

Domestic Hot Water Heat Pump
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Safety precautions


The product shall be installed, commissioned, repaired only by qualified technicians. Incorrect installation can
result in damage to property and/or injuries to people and animals.

The unit shall be disconnected from the power supply when the cover is off.

The unit shall not be used by children or people with limited physical or mental capacity.

Children should be supervised to ensure that they do not play with the appliance.

Cleaning and maintenance shall not be made by children without supervision.

Do not place flammable materials in contact or close to the unit.

The water system and the air system should be installed as stated in the manual.

When in service, the unit should not be placed in sub-zero temperature areas.

When not in service, the unit can be placed in sub-zero temperature areas, but all the water in the tank or in the
condensate drain should be removed.

Hot water can cause serious burns if directly connected to the taps. The installation of a mixing valve is suggested.

The unit should be used only for its specified use. The manufacturer is not liable for any damages due to failure to
observe this manual.

Take all the possible precautions to avoid incidents.

The product contains HFC-R134a
 The electrical supply, for the domestic hot water heat pump, must be protected by an earth leakage breaker and an
overcurrent protection device (fuse or circuit breaker).
Failure to comply with this precaution may result in electric shock or fire
 This unit must be connected to the main power supply using a circuit breaker or switch with a contact separation of
at least 3mm
Introduction
The aim of this manual is to give information, instructions and warnings on the domestic hot water heat pump. The
manual is to be used by service engineers, since it contains important safety, diagnosis and operational indications.
The manual is a part of the domestic hot water heat pump and it is to be conserved with care, since it contains
important installation and maintenance instructions that can be useful to assure a long life time and an efficient
operation.
About the product
The product is a domestic hot water heat pump (DHWHP) that has been designed according to EU directives. The
product is intended for hot water production for domestic use or for similar applications. The unit has been designed to
be ready for installation.
General
The domestic hot water heat pump is composed of a water tank, a refrigerant circuit, a cabinet and a display
connected to a control board. The main scope of the appliance is to heat water stored in a tank.
Operation
The unit is programmed to start heating the water inside the tank when its temperature falls below a predetermined
level, BBT3 (T Tank Top) is 5K<SP. The unit stops when the water temperature reaches a set point (SP) that can be
regulated by the user. In general, the appliance is designed to produce enough hot water to cover the need of a
household of 4 persons or more.
There are two ways in which the DHW-HP can heat the water:
1) Heat pump operation
In the operation with heat pump, a heating cycle utilizes the operation of a compressor and the extraction of the
heat from the air to heat the water in the tank. This is the standard way used to heat the domestic hot water, since
it leads to lower electricity consumption, hence also lower running costs.
2) Electric heater operation
The water is heated using an electric heater. An electric resistance is powered to heat the water in a safe, fast and
flexible way. However, using the electrical heater can become an expensive way to produce hot water. This
operation should be used as a back-up or as integration of the standard operation.
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Service Manual