Overall View Of The Installation; Precautions And Warnings Regarding Your Installation; The Outdoor Unit; The Hydraulic Unit - Fujitsu Waterstage Comfort 5 Operation Manual

Air to water heat pump. split system
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Air to Water Heat Pump Split system

2 Overall view of the installation

2 1
Precautions and warnings regarding
your installation

2 1 1 The outdoor unit

The outdoor unit contains the equipment for capturing
energy from the ambient air.
Your installer has placed this unit in a location that
enables it to operate in an optimum manner.
Nothing should obstruct the air circulation through the
evaporator and from the fan.
The water that the air contains condenses and flows
from the external unit.
In cold periods, this water freezes in contact with the
exchanger and is drained away by regular defrosting
cycles. The control system automatically controls the
defrosting cycle, whose operation can lead to the quite
normal emission of steam.

2 1 2 The hydraulic unit

The hydraulic unit contains the heat pump complete
control system, in charge of controlling the heating
comfort level (and the production of domestic hot water -
if the installation is fitted with a DHW tank with electrical
back-up heating).
The heat pump is equipped with an electrical back-up
system, which is designed to provide additional heat
during the coldest periods.

2 1 3 Control system

Your installer has carefully adjusted your installation. Do
not modify setting parameters without his agreement. If
in doubt, do not hesitate to contact him.
The control system for your heating system is designed
in flow temperature for the water based on the outdoor
temperature (water control).
The installation of a room thermostat (option) allows to
improve operation of the regulation (the influence of the
room temperature is taken into account).
- 4 -

2 1 4 The radiators

To ensure the function of the regulation with room
influence, it's necessary that the room in which the room
thermostat is installed has no thermostatic valve or that
they must be completely open.
2 1 5 Floor-heating systems
New floor-heating systems require to be initially heated
slowly to avoid any problems with cracking. Check
with your installer that this initial heating procedure
has indeed been performed before using your heating
system freely.
The great stability in a regulation system for floor-heating
systems avoids sharp differences in temperature.
However, this stability involves a reaction time of the
order of several hours, (approx 6 hours).
Any changes to the setting must be made slowly, leaving
the installation time to react. Adjusting the system to
exaggerated setting or in an untimely manner always
results in significant temperature fluctuations during
course of the day.
Similarly if your dwelling has a floor-heating system,
do not reduce the heating or switch it off if you will be
absent for a short period. The reheating period is always
quite long (approx 6 hours).
2 1 6 Fan convectors / Dynamic radiators
with integrated control system
Do not use a room sensor in the area.
2 1 7 Domestic hot water (DHW)
When the DHW production is required, the heat pump
adapts to this demand with higher priority.
No space heating is produced while the domestic hot
water is being prepared.
Domestic hot water (DHW) is produced by the heat
pump and then topped up, if necessary, by electrical
backup heating or the boiler.
To ensure a DHW setting over 45°C, the electrical back-
up heating or the boiler must be left on (Optional boiler
connection kit).
The electrical back-up heating enables anti-legionella
cycles to be conducted efficiently.
Operation manual "1534 - EN"

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