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SAFETY
2.3 IMPORTANT NOTICE
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PLEASE READ THE MANUAL CAREFULLY BEFORE
STARTING TO WORK ON THE INSTALLATION OF THE
SANITARY HOT WATER HEAT PUMP SYSTEM. Failure to
observe the instructions for installation, use and operation
described in this documentation may result in operating
failure including potentially serious faults, or even the
destruction of the sanitary hot water heat pump system.
•
This sanitary hot water heat pump has been designed for
the production of sanitary hot water for human consumption.
Do not use it for other purposes such as for drying clothes,
heating foods or for any other heating process.
Refer to the codification of models to confirm the main
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characteristics of your system.
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Check and make sure that the explanations of each part of
this manual apply to your specific model of sanitary hot water
heat pump.
•
Verify that all the information required for the correct
installation of the system is correct according to the manuals
bundled with outdoor and indoor units. Contact your
distributor if it is not the case.
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Signal words (NOTE, DANGER and CAUTION) are used
to identify levels of hazard seriousness. Definitions for
identifying hazard levels are provided in the first pages of this
document.
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This manual should be considered as an integral part of the
sanitary hot water heat pump, and must be kept for future
reference.
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Both the indoor and outdoor unit must be installed at a
location, structure or support prepared to withstand a heavy
weight. Otherwise, noise and vibration may increase, and the
units may collapse and cause damage to property or physical
injuries, particularly in case of an earthquake or a similar
phenomenon.
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Keep the water temperature of the system above the freezing
temperature (above 5 ºC).
•
Please install a thermostat-type mixer tap in each hot water
supply spot to prevent scald accidents, and a drain trap in the
drainage piping.
•
Please use dielectric joints to prevent the electrolysis
phenomenon.
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Piping parts around the tank such as the pressure-relief valve
and the drain valve must be easily accessed for maintenance
and inspection.
2
PMML0451 rev.2 - 03/2018
Be sure to use the specified piping set for R410A. Otherwise,
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this may result in damage to copper pipes and operational
failure.
Make sure that nothing but the specified refrigerant (R410A)
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is inside the refrigerant cycle when installing or removing the
sanitary hot water heat pump. If air or moisture remain in the
refrigeration cycle, pressure may become abnormally high
and cause rupture.
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Ventilate the room if any refrigerant has leaked out during the
installation work. The refrigerant produces a poisonous gas if
exposed to fire.
The drainage gas flows backward if there is no drain trap,
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which may increase the corrosion of the hot water pump
considerably, leading to breakdown.
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Be sure to use a dedicated power circuit. Never use a power
circuit shared with another appliance.
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For wiring, use a cable long enough to cover the entire
distance with no intermediate connections. The power circuit
must be a dedicated one, without additional loads on the
power supply. Failure to do so may result in abnormal heat,
electrical shock, or fire.
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Be sure to connect both outdoor and indoor units to ground.
An improperly made or incomplete ground connection may
cause damage or short-circuits that could result in electrical
shock and fire. A high surge current from lightning or other
sources may cause damage to the outdoor unit. Ground
connections must not be made to utility pipes, gas pipes,
water pipes, surge absorb, lightning rods or telephone ground
connections.
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Be sure to install an earth leakage and a circuit breaker
according to local regulations. Failure to do so may result in
electrical shock.
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The operation modes of these units are controlled by the unit
controller.
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HITACHI pursues a policy of continuous improvement in
product design and performance. The right is therefore
reserved to vary specifications without notice. No part of this
manual may be reproduced without written permission.
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HITACHI cannot anticipate every possible circumstance that
might involve a potential hazard. If you have any questions,
contact your service contractor of HITACHI.
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