User Instructions
Page 4
Introduction
These instructions are intended to assist the user with the operation of a Grant
Aerona³ air source heat pump. Full details on the Installation, Commissioning
and Servicing of the heat pump are contained in the Installation Instructions
supplied with the unit.
About your Heat Pump
Your Grant Aerona³ air source heat pump is a highly effi cient and fully
automatic unit that extracts heat energy from the outside air to heat your
home.
The Grant Aerona³ is an ‘air to water’ heat pump. In operation, the fan (or
fans) draws air through the fi nned coil evaporating the refrigerant in the heat
pump. This refrigerant is then compressed to increase its heat energy before it
passes through a heat exchanger transferring that heat energy to the water of
your heating system.
Heat Pump display Pad
Your heat pump will usually be fi tted with a display pad(refer to Figure 1). This
will be electrically connected to the heat pump outside, but will be located in
a convenient position within your home.
Figure 1:
Heat pump display pad (with door closed)
The display pad has three principle functions.
•
The fi rst is to enable the heat pump operating parameters to be accessed
and adjusted as required by the heat pump installer.
•
The second is to provide a simple means of switching the heat pump ON
or OFF as and when required using the ON/OFF button (1). Refer to the
‘Switching the Heat Pump ON or OFF’ section in these User Instructions.
• Thirdly, in the event that a fault is detected, a red LED on the ON/OFF
switch of the display pad will fl ash and a warning icon and error code
will be displayed on LCD screen and also on the Terminal PCB display.
The heat pump is supplied with the operating parameters set to the factory
default values. However, these parameter settings should have been checked
by the installer when the heat pump was commissioned and adjusted where
necessary to ensure they are correctly set to suit your particular installation.
These heat pump operating parameters should NOT then be altered other
than by either the installer or a Grant Service Engineer if and when necessary.
When switched ON, the display pad screen will display both the outside air
temperature and inside air temperature (for the area where the display pad is
located).
The installer should have set the correct day and time that is also displayed on
the display padscreen. If not, refer to the instructions provided in Section 9.2
of the Installation Instructions supplied with the heat pump.
Heating System Controls
Your Grant Aerona³ heat pump is NOT controlled by the display pad but will
usually be controlled by a normal domestic heating control system.
This control system will typically consist of the following controls:
Room thermostats, programmable or non progammable, which keeps the
areas at the desired temperatures.
A room thermostat
This allows the required air temperature to be set. When the air temperature
is below this setting the thermostat will ‘call’ for the heat pump to operate to
provide heating. This is usually located in a downstairs area such as a hallway
or living room, but you may have more than one room thermostat if your
heating system is ‘zoned’.
Cylinder thermostat
This controls the temperature of the water in your hot water cylinder, provided
that your hot water cylinder is being heated by the heat pump. When the
water temperature in the cylinder is below the thermostat setting it will ‘call’
for the heat pump to operate to heat the hot water. Heating the hot water is
given priority on all heat pump systems and the recommended setting prior to
commissioning is 47°C.
The above is only a general description of the heating and hot water system
controls that you may have. You must refer to the manufacturers’ operating
instructions provided with these controls for full details of their correct setting
and operation.
The operation and setting of these system controls should be explained to you
by the installer.
NOTE
NOTE
The heat pump display pad does NOT control
the ON and OFF times or temperatures of
your heating system. These are controlled
by your heating system controls. Refer to the
‘Heating System Controls’ section of these User
Instructions.
In normal running mode your heating
system remains on all the time. To adjust
the temperature in house use the room
thermostats. For domestic hot water this is set
as hot water priority.
NOTE
With the Grant Aerona³ heat pump, Grant
recommends that the hot water heating
periods should be set to occur when the heat
pump is NOT operating to provide heating, i.e.
when the programmer is set to OFF for heating.
NOTE
For the heat pump to operate to provide
heating, the room thermostat must be ‘calling’.
