Dimplex A Class User manual

A Class Air Source Heat Pump
User Guide
Issue 1.04 - Draft
8/60476/0
User Manual

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1 Introduction 2
2 How the heat pump works 2
2.1 Tips and advice to follow when using your new heat pump 2
3 Heating system controller (UI) 4
3.1 Screensaver mode (when UI controls zone 1 temperature) 5
3.2 Home screen 5
3.2.1 Domestic hot water (DHW) 5
TABLE OF CONTENTS
3.2.2 Space heating 5
3.2.3 Information 5
3.2.4 Temporary mode 5
3.3 Space heating menu 5
3.3.1 Zone temperature 5
3.3.2 Comfort level 6
3.3.3 Operating modes 6
3.3.4 Settings 7
3.3.5 Other display information 7
3.3.6 Quiet mode 7
3.4 Domestic hot water (DHW) menu 7
3.4.1 DHW set-point temperature 7
3.4.2 Maximum achievable temperatures 7
3.4.3 Boost 7
3.4.4 Operating modes and settings 8
3.4.5 Disinfection 8
3.4.6 Other display information 8
3.5 Information menu 9
3.5.1 Login 9
3.5.2 Message list 9
3.5.3 Changing outside off temperature 9
3.5.6 Other display information 9
3.6 Temporary modes 11
3.6.1 Going Out 11
3.6.2 Home Early 11
3.6.3 Holiday mode 11

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WARNINGS
• Installation and any service work on the heat pump may only be performed by authorised and qualified installer
and after-sales service technicians.
• This device is not suitable for operation with an electrical generator and any attempt to do so will void warranty.
• If the heat pump may be disconnected from power supply for prolonged periods of time or where power
supplies are susceptible to failure, antifreeze must be added to the system.
• Additional heating may be required if heat pump is intended to dry out a new or renovated building, as the
initial heat load will be higher than the calculated load.
• Products not installed with the Dimplex hydraulics packs will not be supported by Dimplex. This includes but is
not limited to thermal stores.
• This appliance can be used by children aged from 8 years and persons with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge, provided that they have been given supervision or
instruction concerning use of the appliance in a safe way and understand the hazards involved. Children must
not play with the appliance. Cleaning and user maintenance must not be carried out by children without
supervision.
HEAT PUMP MAINTENANCE
IMPORTANT - DEFROST INFORMATION
During colder weather, frost builds up on the evaporator coil inside the heat pump. If this frost remains in the
evaporator, it will cause blockages and will prevent air from flowing efficiently through the heat pump, which will result
in poor performance. Therefore, when frost starts to form on the evaporator coil, the heat pump runs a defrost cycle.
This lasts for approximately 4 minutes and melts any frost that is present.
Approximately 2 litres of condensate water is drained from the system every time a defrost cycle occurs. Therefore, it
is essential that this water is drained correctly. The heat pump is supplied with a condensate pipe which must be fed
into a drain or soak away to allow for safe disposal of the excess water. This will prevent icy patches forming on
footpaths or patios in colder weather
Please see section 9 of the Installation manual for ‘System Health Checks / Maintenance’ advice.
NOTE: During the defrost cycle, the heat pump may operate more loudly than usual. Any extensive noise is due to
the compressor, and will stop when the defrost cycle is finished.
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1 INTRODUCTION
Thank you for choosing a Dimplex Heat Pump. Dimplex A-Class is designed specifically to maximise year-round
heating system efficiency, no matter the weather conditions. Its high efficiency means lower running costs and a
faster payback for the homeowner.
2 HOW THE HEAT PUMP WORKS
The operation of the heat pump is shown in figure 1. A heat pump works on the same principle as a fridge, using a
refrigerant fluid which boils at a low temperature. Free energy is taken from the air to boil the refrigerant in the
evaporator coil (1), changing it from a liquid to a vapour. This low grade heat is upgraded by the compressor (2)
increasing its pressure, and consequently its temperature, to a useful high temperature. The heat is transferred to
your heating system by the condenser (3), where the refrigerant becomes liquid once again. The liquid refrigerant is
then expanded using an expansion valve (4) to a low pressure fluid before repeating the cycle.
60-80% of the heat generated by the heat pump comes from the free energy taken from the air, compared to 20-40%
generated by the electricity used to power the heat pump. The internal layout of the Dimplex A Class heat pump can
be seen in figure 2.
2.1 T IPS AND ADVICE TO FOLLOW WHEN USING YOUR NEW HEAT PUMP
Glen Dimplex heat pumps are designed with efficiency in mind. As a result of using our renewable technology rather
than combustion or fossil fuels, the hot water used to heat your home is heated gradually, which allows the system to
only use as much energy as is required. Because of this however, it will be necessary to set your new heating system
to heat water/rooms a little earlier than you would have had to set a traditional oil or gas heating system, in order to
allow ample time for the desired temperatures to be achieved.
When using a Glen Dimplex heating system, it is important to remember that if the space heating and domestic hot
water are set to come on at the same time using the timer function, the domestic hot water will take priority. If, for
example, you require both hot water and heating in the morning, it is recommended to use the DHW (domestic hot
water) function first, followed by the space heating, as the DHW takes longer to heat up initially, but the insulation
used on our cylinders ensures that hot water will stay hot for as long as possible.
FIGURE 1: REFRIGERATION CYCLE

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3 HEATING SYSTEM CONTROLLER (UI)
The controller/user interface that is supplied with the Dimplex A-Class heat pump is used as a heat pump controller
as well as a heating and domestic hot water (DHW) controller. It is also the preferred option for use as a temperature
control device.
When your heat pump system was installed, the installer would have discussed with you the different temperature
control device options available. While only one user interface is currently available per system, there are additional
options of either temperature probes or mechanical thermostats, which can be used to control the temperature in up
to four zones.
Mechanical thermostats provide less control over the heating system, while the temperature probe option allows the
heat pump to sense changes in demand and adjust accordingly. The temperature probe option is generally
recommended over the mechanical thermostat option.
A zone is defined as the physical area of your home in which temperatures are controlled by each individual device.
For example, you might have the user interface installed in your living area, in which case this may be referred to as
zone 1. You may also install a temperature probe upstairs in the sleeping/bedroom area, which would then be
designated as zone 2, and so on. Extra zones are an additional, optional feature of the heating system. The standard
package comes with one User Interface and the possibility of four separate zones.
FIGURE 3: OPERATING THE MAIN USER INTERFACE (UI)

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3.1 S CREENSAVER MODE ( WHEN UI CONTROLS ZONE 1 TEMPERATURE )
If the UI is not in use, the screen will switch to screensaver mode after ten seconds, which displays the current and
set point temperatures, as shown in figure 3. When using a mechanical thermostat to control temperature in
zone 1, the screensaver feature will not be available. Turning the dial left or right will decrease or increase the
temperature. Clicking the middle of the dial confirms the new set point temperature for zone 1.
NOTE: If TIMER mode is set, this will override any manual temperature change attempts.
3.2 H OME SCREEN
If your UI is in screensaver mode (see figure 3), the home screen can be accessed by pressing confirm on the rotary
dial. Otherwise, the home screen is the default screen.
As well as the time and date, the home screen will show the following icons;
3.2.1 Domestic Hot Water (DHW):
This icon shows the current temperature of the hot water in the cylinder in °C. Clicking on this icon will
bring you to the DHW menu - see section 3.4 for details and functions.
3.2.2 Space Heating:
This icon shows the temperature of zone 1 and also the outside temperature, both in °C. Clicking on this
icon will bring you to the SH menu - see section 3.3 for details and functions.
3.2.3 Information:
Clicking on this icon allows you to view details on the heat pump, the current operation of the various
parts of the heating system, the system run time history and any warning messages that may occur. If
this icon is not white or green (i.e. orange or red), it may indicate a fault with the heat pump - see section
3.5 for more details.
3.2.4 Temporary Mode:
This icon indicates the temporary mode (if any) currently selected. The icon shown to the left is the
default (no temporary mode) setting. See section 3.6 for other options, including Going Out, Home Early
and Holiday mode.
3.3 S PACE HEATING MENU
3.3.1 Zone Temperature:
This icon shows the current set temperature for space heating in zone 1. Clicking this icon will bring you
to a menu where you can change the set point temperature for any zone, first by selecting the zone
name from the list, e.g. Zone 1, then using the rotary dial to change the temperature for the selected
zone.
Once you have selected a zone, you will be able to adjust the set temperature. There is also a Comfort
Level option in this menu - see section 3.3.2.

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3.3.2 Comfort Level:
If you feel that the desired room air temperature in your home is not being reached, it is possible to increase the
comfort level settings on your UI, which changes the water input temperature for your entire heating system.
Glen Dimplex heat pumps allow for weather compensation, and operate on a heating curve, which will set the flow
(water input) temperature automatically depending on outside conditions. The heating curves for each zone in your
home would have been set up by the installer during the heat pump installation. Changing the water input
temperature will change the response time for your heating system.
In the comfort level sub-menu it is possible to alter the water input temperature for your system within a range of 6°C
(-3°C to +3°C).
A warmer water input temperature will increase energy consumption and therefore running costs - every 1°C
reduction in the system’s water input temperature will reduce energy consumption by 2.5%.
You can set your comfort level to automatically remain set for anything from 1 hour to 14 days (for short term
changes or seasonal adjustments), or if you wish to keep your settings permanently, there is a permanent setting
option which will stay as set until you change it again manually. The default comfort level setting is 0.
3.3.3 Operating Modes
The clock icon indicates the current operating mode for the space heating.
There are three running modes available;
• TIMER
TIMER mode activates the pre-set timer programmes which can be modified in the Settings sub-menu
(see section 3.3.4).
• ON
ON mode turns the heating to constantly on. Heating will remain running constantly until the set point
temperature is reached or the outside off temperature is surpassed (see section 3.5.3 for information on
setting an outside off temperature).
• OFF
At initial start up, the heating will be set to OFF and will need to be set to either ON or TIMER mode as
required.
In OFF mode, you will be asked for a set-back temperature, which will be the OFF temperature
(minimum room temperature) when the system is idle or between TIMER periods. This is a frost
prevention feature and the default temperature is 15°C, however this can be modified to suit the climate
as often as required.
OFF

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3.3.4 Settings
Clicking on the Setting icon will allow you to edit the settings for TIMER options/periods.
A list of options will be displayed (Option 1-5). Clicking on one of the options will allow you to change the ON time,
OFF time and set point temperature for three individual time periods (per Option), as well as toggling the Quiet mode
option ON/OFF.
3.3.5 Other Display Information
*Only visible on UI when TIMER mode is set to ON
3.3.6 Quiet Mode
Runs the heat pump in quiet mode, which may be desirable at night if the heat pump is located near bedrooms.
Please note that in quiet mode it will take longer to reach the set temperature as the heat pump is running at a lower
capacity in order to reduce noise.
NOTE: During the defrost cycle, the heat pump may operate more loudly than usual. Any extensive noise is due to
the compressor, and will stop when the defrost cycle is finished.
3.4 D OMESTIC HOT WATER (DHW) MENU
3.4.1 DHW Set-point Temperature
This icon shows the set point temperature for the DHW. By clicking on this icon, you can adjust the
DHW temperature using the rotary dial.
NOTE: If TIMER mode is set, this will override any manual temperature change attempts.
3.4.2 Maximum Achievable Temperatures
A practical temperature for domestic hot water is 45°C. The A-Class cylinder and heat pump together can typically
achieve up to 60°C. The maximum achievable temperature for the heat pump is measured during commissioning,
and an indication is given when selecting the DHW set-point if the immersion will be required to achieve the set-point
(adjusting the temperature of the DHW above the maximum cylinder temperature causes the immersion to be used to
heat the water above this maximum temperature).
3.4.3 Boost
When using TIMER mode, you may want to use DHW before the next scheduled period, for example, if you arrive
home from work early and want to take a shower, but the DHW isn’t scheduled to run until later. In this case, the
Boost function can be used to override the TIMER until the water in the cylinder reaches the set point temperature.
Seng
Heater: ON or OFF - shows status of heating system
Timer: ON or OFF - shows whether the TIMER function is set or not
Programme:* The currently selecte option, e.g. Option 1
Currently:* ON or OFF - shows the status of the current programme, e.g. Option 1 is ON
Next Perio : The ue time an set temperature for the next programme change
Boost

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3.4.4 Operating Modes and Settings
The operating modes for the DHW menu function in almost the same way as the space heating operating modes and
share the same icons (see section 3.3.3).
The Setting icon for the DHW menu is also the same as that shown on the space heating, however rather than listing
Option 1-5, the DHW menu has only three modifiable options; Weekday, Weekend and Custom. Each of these
options, like the options for space heating, can have up to three separate time periods programmed.
3.4.5 Disinfection
Clicking on the Disinfect icon will take you to the disinfection menu. The disinfection menu displays the hot water
temperature, the details of the last disinfection that took place (date and time) and the date and time of the next
scheduled disinfection.
Disinfection is a function which keeps the level of legionella bacteria in the cylinder under acceptable levels. This is
carried out by heating the hot water in the cylinder to a high temperature for a minimum set time.
In the disinfection menu, you can change the frequency of disinfection (Daily, Weekly Eco, Weekly or Fortnightly),
choose a day for weekly disinfections (if applicable) and modify the disinfection ON time.
3.4.6 Other Display Information
Disinfect
DHW: ON or OFF - The current status of the domestic hot water function
Timer: ON or OFF - Shows whether the time function is set or not
Boost: ON or OFF - Shows whether the Boost function is active or not

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3.5 I
NFORMATION MENU
Clicking on the Information icon on the home screen will take you to the information menu. Here, the status of
different components of the heating system are displayed. The icons for these components are shown below. If the
icons are green, the component is ON. If the icon is white, the component is OFF.
NOTE: Some of the symbols displayed on this screen will depend on the set up of your heating system, therefore
some icons may not be visible.
If the information symbol on the home screen is highlighted orange, it means a minor fault has occurred. When the
message icon is highlighted in red on the home screen, it usually means there is an issue with the operation of the
heat pump. When you see this you must contact the heat pump installer and provide them with the error code.
3.5.1 Login
Clicking on this icon will allow you to input an access code using the rotary dial to scroll through numbers from 0-
1000 (you can scroll forwards or backwards, i.e. to input 998, scroll back from 0, rather than forward through all of the
other numbers). Entering the code 998 will allow you to access an additional menu where you can change the time
and date, the outside off temperature and view a list of any messages that have occurred.
You will also find a number of other sub menus in the ‘Login = 998’ menu. These menus display information about
temperatures in each zone, which may be required when speaking to a service agent.
3.5.2 Message List
If a message is active, it will be highlighted orange. Selecting the message will open a list of details about the system
operation the moment the message occurred.
Heat Pump Bivalent Boiler
Domestic Hot Water Space Heating
Backup Heater Cylinder Immersion
Login 0
Information Menu Screen