Grant Aerona 3 T205 - C User manual

IRL | DOC 0016 | Rev 01.00 | OCTOBER 2021
Grant Aerona³
Air to Water High Efficiency Heat Pump Range
User Instructions
Heating Controls

Special Text Formats
The following special text formats are used in this manual for the purposes
listed below:
GRANT ENGINEERING (IRELAND) ULC
Crinkle, Birr, Co Offaly
R42 D788, Ireland
www.grantengineering.ie
Email: [email protected]
Tel:[phone] Fax: [phone]
This manual is accurate at the date of printing but will be superseded and should be disregarded if specifications and/or appearances are changed in the interests of continued product improvement. However, no respon-
sibility of any kind for any injury, death, loss, damage or delay however caused resulting from the use of this manual can be accepted by Grant Engineering (Ireland) ULC, the author or others involved in its publication.
All good sold are subject to our official Conditions of Sale, a copy of which may be obtained on application.
© Grant Engineering (Ireland) ULC No part of this manual may be reproduced by any means without prior written consent.
WARNING
CAUTION
NOTE
Warning of possible human injury as a
consequence of not following the instructions
in the warning.
Caution concerning likely damage to
equipment or tools as a consequence of not
following the instructions in the caution.
Used for emphasis or information not directly
concerned with the surrounding text but of
importance to the reader.

CONTENTS
Introduction 4
About your Heat Pump 4
Heat Pump Display Pad 4
Heating System Controls 4
Cylinder Digital Stat 5
Grant Hot Water Boost Kit 5-9
To Switch the Heat Pump On or Off 10
(via the Display Pad)
To Switch the Heat Pump On or Off 10
(without the Display Pad)
Display Pad Panel 10
Weather Compensation 11
Frost Protection 11
Looking after your Heat Pump 11
Troubleshooting 11
Contents Page 3

User InstructionsPage 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 efficient 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 finned 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 fitted 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 first 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 flash 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’.

User Instructions Page 5
Cylinder Digital Stat Grant Hot Water Boost Kit
In addition to the programmer and cylinder thermostat, to control the ON and
OFF times of the water heating, you may also have a Grant Automatic DHW
Boost Kit 2 control fitted.
This optional control allows the cylinder immersion heater to periodically
raise the water temperature in the cylinder to 60°C to prevent Legionella. It
incorporates a timer allowing it to be pre-set to automatically operate the
immersion heater for the required period on either a daily or weekly basis.
Refer to the Installation and User Instructions supplied with the Boost Kit for
further information.
If fitted, the Boost Kit timer should have been set by the installer to suit your
installation when your heat pump was commissioned. Refer to Section 5.4 of
the Installation Instructions supplied with your Aerona³ heat pump for further
details if required.
NOTE
When setting the stat please set no higher than
47°C for most efficient running of domestic hot
water
NOTE
The Immersion heater switch or switched
isolator usually located on the wall next to
your hot water cylinder, MUST be switched ON
for the Boost Kit to automatically operate the
immersion heater.
WARNING
WARNING
If either the Immersion heater switch (on the
wall), or the timer override, is set to OFF the
anti-legionella function will not operate.
Do not set above 53°C at any stage without
consulting Grant Engineering as it will affect
your heating system

Page 6
Setting the Day and Time of the week
1. Press the 'TIME' button Setting for 2 seconds.
Day of week will start flashing (example shows 7 Day setting Dia.3)
2. Use the '+' or '-' button to change the display to the correct day of
the week.
3. Press the 'TIME' button and the hour digits will flash.(Dia.4)
4. Use the '+' or '-' button to set the hours.
5. Press the 'TIME' button and the minute digits will flash. (Dia.5)
6. Use the '+' or '-' button to set the minutes.
7. Press the 'TIME' button to save the setting and return to operating
mode.
Time boost kit for Legionella protection
• Timer Spur must not be mounted on a flammable surface.
• Ensure that the Timer Spur does not come into contact with
any combustible materials such as towels or bedding.
• Ensure at least a 300mm air space is allowed around the
Timer Spur switch.
• A 12mm pattress is provided if extra spacing is required
• Twin Earth terminal provided.
• Fixing screw caps must be installed to maintain class 2
status
Operating Instructions
Reset The Device
1. To fully reset this unit press the recessed
‘Reset’ button with a insulated blunt probe.
2. A full display will show when the battery is charged, then revert
to the default screen (- -: -- ). No display indicates that the battery
requires charging for a minimum 3 hour period. (Dia.2 - Full display)
NOTE
This unit should be installed by a competent
person in accordance with the current IET
Wiring Regulations. If in doubt consult a
qualified electrician.
NOTE
Where earthing termination is required this
must be connected to a earth terminal as
provided in a metal back box.
‘ON’ Indicator Programme
Button
Time
Button
Fuse
Holder
Front Cable
Entry
Double Pole
Isolation Switch
Reset
Button
‘+’ and ‘-’
Button
Dia.1
Dia.2
Dia.3
Dia.4
Dia.5
NOTE
If '+' or '-' button is held for more than 2
seconds, the selected time digit will add or
decrease quickly (about 5 steps per second),
if no key is pressed within 60 seconds the
display will return to operating mode.
User Instructions

Page 7
Programming the ON/OFF times
1. Press the ‘PROG’ button and hold for 2 seconds, after 2 seconds
the display will show (example shows 7 Day setting Dia.6)
2. Use the ‘+’ or ‘-’ button to change the day grouping (PROG) at the
top of the display. This will step through the following programming
options:
7 DAY - MON TUES WED THU FRI SAT SUN
All of them have the same programming.
OR
5 DAY - MON TUE WED THU FRI
Are grouped as one group, and they will all have the same
programming. SAT and SUN will be programmed individually.
OR
INDIVIDUAL DAY -
Each day will have its program set individually. MON followed
automatically in programming by each of the other days. To copy
times set for an individual day to another day (e.g. copy Sat set
times to Sun), please see PROGRAM
DUPLICATION below.
3. Once the desired day grouping is selected, press ‘PROG’ button to
move onto programming ON/OFF times. Display will show PROG 1
ON, and the hour digits flashing (24 hour clock) (Dia.7).
(Example shown is for 5 + 1 + 1 + day program)
4. Use the ‘+’ or ‘-’ to set the hours and the ‘PROG’ to change
between hours and minutes. Followed by ‘+’ or ‘-’ again to set the
Minutes. Press ‘PROG’ to change to program OFF time. (Dia.8)
5. Use the ‘+’ or ‘-’ to set the OFF time in the same way as for PROG
1 ON time.
6. Press ‘PROG’ to scroll through program 2 ON, program 2 OFF,
program 3 ON, program 3 OFF, program 4 ON, program 4 OFF, add-
ing in times as required. If you wish to omit programmes just leave
dashes in that ON/OFF location. Press ‘PROG’ to move to the next
linked day (SAT follows the 5 day group automatically)
(Dia.9).
7. Set ON/OFF times as before. Press ‘PROG’ to move to the next
linked day (SUN follows the SAT automatically) (Dia.10).
8. Set ON/OFF times as before.
9. Once program 4 OFF has been set, press ‘PROG’ to exit
program mode and return to operating mode.
Program Duplication
There are two copy functions: copy one day to another, or copy one
day to all other days. When programming for ‘Individual Day’ or ‘5
Day’ you can copy the programmed data from one day to another
day.
1. When setting ON time of ‘PROG’ 1, press ‘TIME’ button and then
use ‘+’ or ‘-’ to select the day you want to copy.
2. Press ‘TIME’ button twice to copy the data of the selected day to
current day. Or press ‘TIME’ button for 2 seconds to copy the data of
the selected day to the following days.
(Example shown for copying data TUE to THU)
When the ON/OFF times for WED are set, the display will show
‘THU’:- (Dia.11).
Dia.8
Dia.9
Dia.10
Dia.6
NOTE
Only ONE of the following options can be
used at one time.
Dia.7
User Instructions

Page 8
Dia.11
Dia.12
Dia.13
Dia.15
Dia.16
Dia.17
Dia.18
Dia.19
Dia.14
NOTE
Operating mode needs to be set to allow
programmed times to function
3. Press ‘TIME’ button then the icon ‘MON’ will be flashing (Dia.12).
4. Use ‘+’ or ‘-’ button to select ‘TUE’, then press ‘TIME’ button twice
to copy the data. The display will show: (Dia.13).
Modifying or adding new programmes
1. Press ‘PROG’ button and hold for approx 2 seconds, the display
will show: (Dia.14).
2. Use ‘+’ or ‘-’ button to select the day grouping which requires
modifying or a new day grouping for a new programme.
3. For modification press ‘PROG’ repeatedly to arrive at the pro-
gramme time requiring modification then use ‘+’ or ‘-’ button to
make the change. Press ‘PROG’ repeatedly again to arrive at the
next time requiring modification and use ‘+’ or ‘-’ button to make the
change.
Operating mode
1. Use’+’ button to set the output mode.
ON - Output to permanently ON and omit the program (Dia.15).
OFF - Output to permanently OFF and omit the program (Dia.16).
ON AUTO - Output to ON until next program OFF period (Dia.17).
OFF AUTO - Output to OFF until next program ON period (Dia.18).
One and two hour boost
1. Pressing ‘-’ (Boost) once in normal operating mode turns on for 1
hour period (Dia.19).
User Instructions

Page 9
2. Pressing ‘-’ (Boost) twice turns output on a for 2 hour period
(Dia.20).
3. Pressing ‘-’ (Boost) button three times cancels the (Boost) ON
period (Dia.21).
Operation
With the Automatic DHW Boost Kit 3 fitted, the HW cylinder
thermostat should be set to 47°C for optimum operation. When the
heat pump raises the cylinder to this temperature the cylinder
thermostat will be 'satisfied'
The time boost kit should be set as required to raise the temperature
in the cylinder to 60°C, usually for an hour or two weekly, or as
determined by the installer to match the occupants requirements.
If an amount of hot water drawn off is small, the temperature drop in
cylinder may be minimal and the cylinder thermostat may not detect
it. In this case the cylinder thermostat will continue to supply the
demand to the Boost Kit and the Immersion heater will continue to
operate.
FUSED TIMER SPUR SWITCH - 7 DAY
Ideal for control of towel rails, panel heaters, immersion heaters & fan
heaters.
• Energy saving
• Easy to program
• ‘Boost’ and ‘Advance’ controls
• Surface/flush mounting
• Front cable entry
• Will fit 25 - 47mm back boxes
SPECIFICATIONS
fused timer spur switch - 7 day
TECHNICAL DATA SHEET
TECHNICAL DATA SHEET
fused timer spur switch - 7 day
TECHNICAL DATA SHEET
TECHNICAL DATA SHEET
Spur Timer
12.5mm thick pattress front plate thickness 12.5mm
Dia.21
Dia.20
T205 - C
Product Finish White
Product Dimensions 86.5 x 86.5 x 40mm
(46.5mm including switch on front)
Product Weight 180 gms
Bar-code 5012739634949
Voltage 230V - 50Hz
Rated Impulse Voltage 2,500V
Pollution Degree 2
Display LCD
Operating Temp -5°C to +40°C
Battery Life 700 hrs
Max Load Resistive 13A inductive 6A
Isolation Double Pole Isolation Switch
Settings 28 ON and OFF
Easy set - day / 5 day / 7 day blocks
Max Wattage 3000W
Operating Temp -5ºC to +40ºC
Main housing material Polycarbonate
Fixings 2 x 35mm, 3.5mm/2 x 25mm, 3.5mm
Fixing screws
Guarantee 1 Year
Certification &
Conformity
BS 1363-4:1995+A4:2012,
BS EN 60730-1:2011,
BS EN 60730-2-7:2010,
BS 4662:2006+A1:2009
User Instructions

User InstructionsPage 10
To Switch the Heat Pump ON or OFF (via the Display
Pad)
To switch the heat pump ON:
1. First, check the power supply to the heat pump is switch ON at the
weatherproof isolator. This is usually located outside next to the heat
pump.
2. Press and hold the ON/OFF switch (1) for 3 seconds. Refer to Figure 3.
3. When the Green LED is lit the heat pump is ON.
To switch the heat pump OFF:
1. Press and hold the ON/OFF switch (1) for 3 seconds. Refer to Figure 3.
2. When the Green LED is no longer lit the heat pump is OFF
Figure 3: ON button with indicator LED
In order for the heat pump to start (when it is switched ON) there must also
be a ‘demand’ from the heating system controls. Refer to the ‘Heating System
Controls’ section of these User Instructions.
To Switch the Heat Pump ON or OFF (without the
Display Pad)
Your heat pump may have been installed without a display pad connected.
If this is the case, you can still switch the heat pump off by simply switching
the external electrical isolator to OFF. This isolator is usually located on the
outside wall of your house next to the heat pump.
To switch the heat pump back on: Switch the external electrical isolator back
to ON.
In order for the heat pump to start (when it is switched ON) there must also
be a ‘demand’ from the heating system controls. Refer to the ‘Heating System
Controls’ section of these User Instructions.
Display Pad Panel
The operation of the heat pump is indicated in the top right hand corner of the
display padscreen using the following symbols:
This indicates the frost protection is activate. Refer to the ‘Frost Protection’
section of these User Instructions.
This indicates the defrost cycle is active.
This indicates a heating demand. If this is displayed on the display pad
screen the programmer and room thermostat are ‘calling’
If the ‘sun’ symbol is flashing it indicates that the heat pump is in the
heating mode but the heating has stopped due to a hot water heating
demand that has priority.
This indicates a hot water demand. If this is displayed on the display pad
screen the programmer and cylinder thermostat are ‘calling’
This indicates the heat pump fan is running.
This indicates the circulating pump (in the heat pump) is running.
This indicates the heat pump compressor is running.
If this symbol is flashing it indicates that the operation of the compressor is
being delayed by the internal controls of the heat pump. This delay should
normally stop after a short period and the compressor (and heat pump)
will operate.
Figure 3: ON button with indicator LED
Green LED
NOTE
Whilst the heat pump is switched ON and
ready to operate it may not start!
NOTE
If the electrical supply to the heat pump is
switched off at the external isolator, the frost
protection function will NOT operate. Refer
to the ‘Frost Protection’ section of these User
Instructions.
Even when the heat pump is switched ON and
ready to operate it may not start!
NOTE

User Instructions Page 11
Weather Compensation
Your Grant Aerona³ heat pump has a built-in ‘weather compensation’
function that varies the heating system water temperature as the outdoor air
temperature changes, i.e. as the outdoor air temperature falls the system flow
temperature increases and vice versa . Refer to Section 3.7 of the Installation
Instructions supplied with the heat pump.
This function helps to improve the thermal efficiency of your heating system.
The heat pump is supplied with default settings for this weather compensation
functions and these should be checked and altered, if required, by the installer
during commissioning to suit your heating system.
When the actual outside air temperature is the above the ‘maximum outdoor
air temperature’ setting of the weather compensation function the heat pump
will NOT operate for heating, even if there is a demand from the heating
system controls.
This is not a fault with the heat pump but the normal operation of the Weather
Compensation function automatically preventing operation of the heat pump
(and heating system) when the outside air temperature indicates that use of
your heating system would be unnecessary and wasteful.
Frost Protection
Your Grant Aerona³ heat pump is fitted with automatic frost protection that
will operate when either the outside air temperature or the system water
temperature falls to a pre-set value (factory default setting 4°C). For further
details refer to Section 8.3 of the Installation Instructions supplied with the heat
pump.
This frost protection function will operate even when the heat pump is switched
OFF at the remote controller. See the ‘To Switch the Heat Pump ON and OFF’
section of these User Instructions.
As the heat pump frost protection involves the operation of the circulating
pump, it is perfectly normal to hear the circulating pump running (when the
heat pump is off) during periods of cold weather.
The circulating pump may operate for long periods, e.g. all night, when the
conditions dictate but as this pump has a very low power consumption, the
cost involved in protecting your heat pump is very small.
Looking after your Heat Pump
Grant Aerona³ Heat Pumps require very little maintenance but it is important
that the air inlet grille (at the rear and left hand side of the unit) is kept clear at
all times.
Remove any build-up of leaves, snow or any other debris from the air inlet
grille.
Also, ensure that the fan outlet is not obstructed at all times.
To ensure that it continues to operate efficiently your Grant Aerona³ heat
pump should be serviced annually, as detailed in Section 10 of the Installation
Instructions supplied with the unit. Contact your installer or service engineer to
carry out this work.
Troubleshooting
If your heat pump fails to operate:
First
check: Is the power supply is switched ON at the external isolator?
If YES:
Check that the heat pump is switched ON at the display pad (if fitted).
Refer to the ‘Heat Pump remote Controller’ section of these User
Instructions.
If YES: Check if there is a demand from the heating system controls.
Refer to the ‘Heating System Controls’ section of these User Instructions.
If YES:
Check if the outside air temperature is greater than the ‘maximum outside
air temperature’ setting of the Weather Compensation function, as this
would prevent the heat pump from operating to meet a heating demand.
Refer to the ‘Weather Compensation’ section of these User Instructions.
If YES: Check the display on the remote controller. Is an error code displayed?
If YES:
What is the error code?
Refer to Section 11 of the Installation Instructions supplied with the heat
pump for a full list of the error codes.
Contact your installer or service engineer for assistance.
Radiator temperatures
Your Grant heat pump is designed to work at lower operating temperatures
than traditional oil or gas fired boilers. Radiators will therefore feel cooler to
the touch, but this should not cause a problem with the heating of your house.
The system will have been designed to work at these lower temperatures and
the heat pump will be set to ensure the correct comfort levels are maintained.
Underfloor heating systems will require a longer pre-heat period to bring the
floor up to operating temperature.
The heat pump has been designed to be as efficient as possible and will
operate at a ‘set point’ temperature depending on conditions inside and
outside of your house. Due to this, your radiators will be warmer some days
and cooler others. This is normal and the heat pump is working correctly.
NOTE
This does not apply to the hot water heating
function of the heat pump. This will still operate
even if the outside air temperature is greater
than the maximum outdoor air temperature
setting of the Weather Compensation function.
NOTE
If the electrical supply to the heat pump is
switched off, e.g. at the external isolator, the
frost protection function will NOT operate.
CAUTION
Do not either:
Stack anything (e.g. garden furniture, bicycles,
etc.) either on or against your heat pump.
Do not place any cover over the unit.

GRANT ENGINEERING (IRELAND) ULC
Crinkle, Birr, Co. Offaly, R42 D788, Ireland
Tel: [phone] Fax: [phone]
Email: [email protected] www.grant.eu