Dimplex A12M User manual

8/60472/0
Issue 1
A Class Air Source Heat Pump
A12M / A16M: Installation Manual

ii
Overall view
Figure 1 (a): Outer dimensions of heat pump, (b) position of heat pump registration plate and details
(c)Internal components of heat pump
(a)
(b)
(c)

iii
Contents
1Introduction .......................................................................................... 1
2Scope of delivery ................................................................................... 1
3Pre-Installation advice .......................................................................... 5
3.1 Warnings .......................................................................................... 5
3.2 Intended use ..................................................................................... 6
3.3 Legal ................................................................................................ 6
3.4 Heat pump sizing ............................................................................... 6
3.5 Site selection..................................................................................... 6
3.5.1 Location of heat pump ................................................................... 6
3.5.2 Heat pump placement and fixing..................................................... 7
3.6 Plumbing –Preparation........................................................................ 8
3.6.1 Buffer tank................................................................................... 9
3.7 Electrical connections - Preparation ...................................................... 9
4Installation .......................................................................................... 10
4.1 Handling and transport ..................................................................... 10
4.2 Plumbing......................................................................................... 10
4.3 Electrical connections ....................................................................... 11
4.4 Opening the heat pump for electrical connections................................. 15
4.4.1 Heat pump electrical connection.................................................... 16
5Set to work .......................................................................................... 17
5.1 Location of indoor components .......................................................... 17
5.2 Set to work ..................................................................................... 17
5.3 Opening the UI ................................................................................ 17
5.4 Using the User Interface ................................................................... 18
6Pre-commissioning .............................................................................. 18
6.1.1 General/Schematic ...................................................................... 19
6.1.2 Message log ............................................................................... 19
6.1.3 Output Tests .............................................................................. 19
6.1.4 Defrost ...................................................................................... 19
6.1.5 Operating data ........................................................................... 19
6.1.6 History ...................................................................................... 19

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7Commissioning .................................................................................... 20
7.1.1 Waterside check.......................................................................... 20
7.1.2 Temperature check ..................................................................... 21
7.1.3 Electrical connections (SH) ........................................................... 21
7.1.4 Water flow check ........................................................................ 21
7.1.5 DHW setup................................................................................. 22
7.1.6 Electrical connections (DHW) ........................................................ 22
7.1.7 DHW Test................................................................................... 22
7.1.8 Disinfection ................................................................................ 23
7.1.9 Heating curves............................................................................ 23
8System health checks .......................................................................... 24
9Troubleshooting, FAQ .......................................................................... 25
9.1 Table of error codes and descriptions.................................................. 25
10 Technical Specifications ................................................................... 24
Appendices:
ARefrigeration cycle................................................................................A
BSchematic zone diagrams......................................................................B
Schematic 1: 10200110 - Space Heating Only .......................................... B
Schematic 2: 10220290 - Zone Space Heating & DHW............................... C
Schematic 3: 10300110 - Bivalent Space Heating .....................................D
Schematic 4: 10310290 - Bivalent Zone Space Heating & DHW .................. E
CWiring centre electrical connections.........................................................F
DInstaller controller cable connections...................................................... G
EInstaller menu flow chart.......................................................................H

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1Introduction
Thank you for choosing a Dimplex Heat
Pump. The Dimplex A class heat pump
combines outstanding performance to
maximise year-round efficiency no
matter what the weather conditions. It
can also deliver high output and high
temperatures even at outside air
temperatures of -7. The sophisticated
controller makes the system easy to
use and there are many more
technological innovations including a
scroll compressor that uses enhanced
vapour injection.
2Scope of delivery
Please ensure you check the scope of
delivery before signing any delivery
documentation. Claims for missing or
damaged parts after signing for the
delivery will not be accepted.
There are 3 options to select from when
installing a Dimplex Heat Pump:
Pack 1 - Space heating and Dimplex
A Class Cylinder
To install the heat pump and
Dimplex A class cylinder together
you must purchase Pack 1 which
contains necessary components
shown in the tables below. A
separate wiring centre is not
required as the wiring centre is built
into the cylinder. The ACCHYPK
Hydraulics pack contains the all of
the necessary hydraulic
components.
Pack 2 - Space heating and Dimplex
Standard Heat Pump Cylinder
To install the heat pump for space
heating and domestic hot water but
not using an A class cylinder you
must purchase Pack 2 which
contains the necessary components
shown in the tables below. A
separate wiring centre is required to
wire the circulation pumps and zone
controls since this is not supplied on
the cylinder. The ACCHYPK
Hydraulics pack contains the all of
the necessary hydraulic
components.
Pack 3 –Space heating only
To install the heat pump for space
heating only, you must purchase
Pack 3 which contains the necessary
components shown in the tables
below. A separate wiring centre is
required to wire the circulation
pumps and zone controls. The
ACSSHYPK Hydraulics pack contains
the all of the necessary hydraulic
components.

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PACK 1:
SPACE HEATING AND DIMPLEX A CLASS CYLINDER
Heat pump
A12M / A16M
Hydraulics Kit A which includes:
ACCHYPK
User interface (UI)
049179
Pump - UPM GEO 25-85 180 (70mm cable)
049148
2 x Pump Valve Gate 1"1/2 –28mm
2 x Washer 30.1x21x2mm
By pass valve (22mm)
Spring loaded
050557
3 port diameter valve
050564
Isolation valves -
(1) Flow
(2) Return with strainer
Flow 062801
Return
062815CR
4 x Blanking plugs for lifting holes
624105
Installation and User manuals
Dimplex DHW Cylinder Kit
Cylinder
Air vent
Drain
Safety group DHW side - expansion vessel,
hose and bracket, inlet group, tundish
3 x Copper pipes –Pump to buffer/cylinder
Pipe connections to coil, pipe, drain and vent
Pipe connections to pump

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PACK 2:
SPACE HEATING AND DIMPLEX STANDARD HEAT PUMP
CYLINDER
Heat pump
A12M / A16M
Hydraulics Pack A which includes:
ACCHYPK
User interface (UI)
049179
Pump - UPM GEO 25-85 180 (70mm cable)
049148
2 x Pump Valve Gate 1"1/2 –28mm
2 x Washer 30.1x21x2mm
Altecnic ERES straight by pass valve
(22mm 22mm) Spring loaded
050557
3 port diameter valve
050564
Isolation valves -
(1) Flow
(2) Return with strainer
Flow 062801
Return
062815CR
4 x Blanking plugs for lifting holes
624105
Installation and User manuals
Wiring centre Kit
Wiring centre module
049162
1 x Temperature probe (NTC10) for DHW

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PACK 3:
SPACE HEATING ONLY
Heat pump
A12M / A16M
Hydraulics Pack B which includes:
ACSSHYPK
User interface (UI)
049179
Pump - UPM GEO 25-85 180 (70mm cable)
049148
2 x Pump Valve Gate 1"1/2 –28mm
2 x Washer 30.1x21x2mm
Altecnic ERES straight by pass valve
(22mm 22mm) Spring loaded
050557
Isolation valves -
(1) Flow
(2) Return with strainer
Flow 062801
Return
062815CR
4 x Blanking plugs for lifting holes
624105
Installation and User manuals
Wiring centre Kit
Wiring centre module
049162
1 x Temperature probe (NTC10) for DHW

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3Pre-Installation advice
3.1 Warnings
When transporting the heat pump,
ensure that it is not tilted more than
45° (in any direction), for any
prolonged period of time.
Do not attempt to lift the heat pump
manually. It weighs 130kg and
should only be lifted using the
appropriate lifting devices.
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 suitable for mains
connection only: 230V, 1P&N, 50Hz,
and is not suitable for operation
with any electrical generator and
any attempt to do so will void
warranty.
This device shall be installed in
accordance with national wiring
regulations. The digital inputs are
volt free, if any voltage, such as a
switch live 230V is connected
irreparable damage will be caused
to the wiring centre. The local wiring
regulations should always be
followed paying particular attention
to mixing of low voltage and extra
low voltage cabling.
Before removing the cover of the
heat pump, cylinder or wiring
centre, ensure that all electrical
circuits are isolated.
Means for disconnection from the
supply mains must be incorporated
in the fixed wiring in accordance
with the national wiring regulations.
The heat pump contains refrigerant
at high pressure. Safety measures
are in place to avoid system
pressure build up:
Stage 1: Pressure transducer
stops compressor
Stage 2: Pressure switch switches
heat pump off.
The installation of a residual current
device (RCD) having a rated
residual operating current not
exceeding 30mA is advisable.
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.
If the heat pump can 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.
Never use cleaning agents
containing sand, soda, acid or
chloride as these can damage the
surfaces/components.
We recommend the installation of a
suitable filtration protection system
and a corrosion additive for the
heating system to prevent the
formation of deposits (e.g. oxide
and solids) in the condenser of the
heat pump. The return isolation
valve provided in the hydraulics
pack has a built in strainer for this
purpose.

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Products not installed with the
Dimplex hydraulics packs will not be
supported by Dimplex. This includes
but is not limited to thermal stores.
During the commissioning of the
domestic hot water cylinder, ensure
that the cylinder is full and no water
is drawn from the cylinder as this
will adversely affect the heat pumps
operation.
This appliance can be used by
children aged from 8 years and
above and persons with reduced
physical, sensory or mental
capabilities or lack of experience
and knowledge if they have been
given supervision or instruction
concerning use of the appliance in a
safe way and understand the
hazards involved. Children shall not
play with the appliance. Cleaning
and user maintenance shall not be
made by children without
supervision.
3.2 Intended use
This device is only intended for
domestic use, as specified by the
manufacturer. Any other use beyond
that intended by the manufacturer is
prohibited. This requires the user to
abide by the manufacturers product
information. Please refrain from
tampering with or altering the device.
3.3 Legal
The construction and design of the heat
pump complies with all relevant EU
directives (see CE declaration of
conformity).
When connecting the heat pump to the
power supply, the relevant EN and IEC
standards are to be adhered to. Any
further connection requirements
stipulated by the network operation
must also be observed.
When connecting to the heating system
all applicable regulations must also be
adhered to.
3.4 Heat pump sizing
Ensure that the correct size heat
pump has been selected in
accordance with the latest version of
MIS3005 (UK only) and with the
Dimplex Heat Pump Planning
Manual.
If a non A-Class heat pump cylinder
is being used, ensure that it has
been accurately sized with the
appropriate coil surface area of the
cylinder to match the heat pump’s
output, flow rate requirements and
that all necessary hydraulic
connections have been considered in
connecting it to the heat pump
system.
Ensure that suitable heat emitters
have been sized in accordance with
the Heat Emitter Guide (UK only)
and selected ensuring a low flow
temperature design. To maximise
system efficiency it is important to
design the system with the lowest
flow temperature possible.
3.5 Site selection
3.5.1 Location of heat pump
The heat pump must be installed
outdoors with adequate clearances
for ventilation and maintenance as
shown in figure 2. It is
recommended that the heat pump is
installed along the property wall, as
shown below.
There must be a minimum distance
of 1000mm in front of the fan to

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prevent air re-circulation.
Positioning the heat pump in a
confined space, frost hollow or well
will result in reduced heat pump
operating efficiency.
The fan should preferably not face
prevailing winds to ensure correct
air flow through the evaporator.
Figure 2: Required free space around heat
pump for ventilation and maintenance
Although the heat pump is within
noise and vibration regulations
outlined in MCS 007, it is
recommended to avoid positioning it
close to bedroom windows, as the
fan and compressor may be
operational at night.
3.5.2 Heat pump placement and fixing
Approximately 2 litres of condensate
water is drained from the system
every time a defrost cycle occurs.
Therefore, it is essential that the
condensate pipe is fed into a drain
or soak away to allow for safe
disposal of the excess water, away
from footpaths or patios.
The condensate pipe must be kept
frost free. Freezing of this pipe due
to incorrect installation can result in
irreparable damage and void
warranty.
Figure 3: Position of fixing holes and condensate drain

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The condensate pipe should not run
into sewer pipe as fumes may travel
into the heat pump and cause
corrosion to the evaporator coil.
The heat pump must be fixed onto a
level, stable base that is capable of
withstanding the unit’s weight of
130kg, with a minimum of 30mm
clearance around all sides of the
heat pump (recommended minimum
L x W x D = 1000 x 470 x 100mm).
It can be secured with M10 anchor
bolts, using the fixing holes shown
in figure 3.
Ideally the heat pump should be
located close to the property.
Positioning of the heat pump at a
distance from the property will
result in the need for extra insulated
pipe, which will lead to extra cost,
and result in additional heat losses.
3.6 Plumbing –Preparation
When selecting piping to install with the
heat pump please ensure:
The pipe sizes are adequate to allow
correct minimum water flow rate
through the heat pump.
Table 1: Maximum length of copper pipe
Nominal
Minimum
@ 2050 l/h
@ 1200 l/h
18 kPA
60 kPa
Diameter
(mm)
Max length
(m)
Max length
(m)
15
1
10
22
10
80
28
30
265
32
60
525
The pipe lengths given in table 1
include the straight length of the
piping and all elbows. The
equivalent straight length (L) of
each elbow is found by multiplying
the outer diameter of the pipe (D)
by 30:
External pipes should be adequately
insulated with vapour resistant
insulation and protected against
damage to prevent excessive heat
losses. All joints should be suitably
sealed and exposed pipework must
be avoided.
Existing hot water systems should
be flushed prior to connection to the
heat pump to remove all
contaminants and impurities, in
accordance with the latest version of
MIS 3005.
Make the water flow and return
pipes positioned correctly for
connection to the heat pump as
shown on the label in figure 4 and
on the back of the heat pump.
Isolation valves, supplied in the
Dimplex heat pump hydraulics pack,
allow the strainer to be removed
and cleaned without having to drain
the system (non-return valve and
ball valve with strainer). Installation
of these valves is discussed in more
detail section 5.2.
If heat emitters consist of underfloor
heating and higher temperature
heat emitters, a mixing valve must
be used to prevent high
temperature water entering the
underfloor heating manifold.
L = D x 30

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Figure 4: Plumbing with isolation valve with strainer to be fitted to return pipe
3.6.1 Buffer tank
The heat pump uses reverse cycle
defrost in order to defrost the
evaporator, which will happen
automatically when required in
cold/moist weather conditions.
Therefore, it is necessary to connect a
buffer tank in series with the heat
pump, as shown in the hydraulic
schematic diagrams (Appendix B). The
Dimplex A-Class cylinder range come
with an integrated buffer tank, which:
Provides sufficient energy for the
unit to carry out successful defrost.
Increases compressor life due to the
extension of minimum starts
It is recommended that a buffer with a
heating element is used as it may be
required if initial start-up and
commissioning are carried out in cold
weather.
3.7 Electrical connections -
Preparation
Ensure the incoming power supply
and the distribution board are
suitably rated.
Ensure that the regulations specified
by the local electricity supplier have
been adhered to.
The supply cable must be sized to
meet the requirements of national
wiring regulations for current
carrying capacity and disconnection,
a minimum cross sectional area of
6mm² steel wire armoured (SWA)
cable is recommended.
The required controller cable is a
shielded MODBUS cable RS485, for
example a 4 core 1mm² 24 AWG
(Nominal impedance 120Ω) Foil and
Braid, which can be purchased from
Dimplex as an accessory.

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The user interface acts as the
temperature probe in the primary
zone. For multiple zones,
mechanical thermostats or NTC10
temperature probes may be used.
4Installation
4.1 Handling and transport
Remember that the heat pump
should never be tilted by more than
45° during handling and transport,
as depicted on the registration plate
and in figure 5.
Figure 5: Tilt angle
Ensure that there is a clear pathway
for a truck to deliver the heat pump
as close to the selected location as
possible.
The heat pump weighs 130kg and
therefore should only be lifted by
means of a lift truck, hand truck or
lifting rods with straps that can be
fed through the holes in the base
plate and frame, shown in figure 6.
The installer must use a suitable
lifting method, in accordance with in
accordance with health and safety
regulations.
Straps must also be used with the
lifting rod to prevent the heat pump
from toppling.
Figure 6: Handling of heat pump
4.2 Plumbing
The system must be flushed, filled
and all trapped air should be
removed. Air bleeds must be
installed at every high point; in
particular, the installer must
remember an air bleed on the flow
pipe if it is a local high point since
there is no air bleed point on the
condenser.
The dirt strainer, supplied in the
Dimplex heat pump hydraulics pack,
is built into the return isolation
valve and must be installed on the
return pipe to prevent
contamination of the condenser heat
exchanger
If an alternative strainer is used, it
must be at least 7 microns in size
and connected with ball valves.
Fit flow and return isolation valves
(Flow 062801, Return 062815CR)
and piping to each of the water
ports on the back of the heat pump,
as shown in figure 7.

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Figure 7: Flow and return valves
The non-return valve built into
‘1062815CR’ allows the strainer to
be cleaned without draining the
system, by simply closing the flow
and return valves and removing the
strainer. The only water that is lost
will be that in the return valve.
System pressure must be checked
once valves are re-opened.
Direct condensate drain pipe to soak
away or drain, as illustrated in
figure 3 in section 3.5.2.
All piping must be properly
insulated.
4.3 Electrical connections
The heat pump system consists of the
heat pump, wiring centre and user
interface. If a Dimplex A Class cylinder
is also purchased, the wiring centre is
built into the cyinder. The user interface
contains a thermostat and is sufficient if
one heating zone is present.
Optional, additional UI’s, temperature
probes or room thermostats are
required for additional heating zones.
Figure 8 (a) –(c) shows the wiring
configuration of the 3 different
installation options (outlined in section
2: Scope of Delivery, at the beginning
of this manual).

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Figure 8 (a): Wiring configuration of space heating and hot water - Dimplex A Class cylinder

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Figure 8 (b): Wiring configuration of space heating and hot water –Dimplex standard
cylinder

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Figure 8 (c): Wiring configuration of space heating only

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4.4 Opening the heat pump for
electrical connections
To open the heat pump, follow the
procedure shown in figure 9:
1. Unscrew 2 screws holding bottom
panel, using a PZ2 screwdriver.
2. Pull the front panel down and then
out to remove.
3. Unscrew 5 screws holding the front
cover of the electrical box to open
and pull down towards you.
4. Remove 2 hex screws holding the
door flap in place to access cable
connections.
NOTE: Follow steps in reverse order to
close the heat pump. When closing the
heat pump front panel, ensure that the
top and bottom panels are interlocked.
Figure 9: Opening the casing to fit electrical connections
WARNINGS:
Before opening the heat
pump, ensure all circuits are
isolated.
Ensure that the components in
the electrical box do not get
wet when the electrical box is
opened.

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4.4.1 Heat pump electrical connection
To make electrical connections to the
heat pump:
1. Feed power cable and controller
cable through gland at the back of
the base panel.
2. Remove the cable access cover and
using the opening in the base panel
for access, pull power cable and
controller cable through the two
cable glands in base panel and
through the two glands on the side
of the electric box.
3. Allow sufficient cable to ensure the
connections are not strained when
the cover is opened. Armoured cable
must be stripped once it has been
pulled through the base cable gland
in order to pass through cable gland
in the side panel of the electrical
box.
4. Connect power cable and controller
cable as shown in figure 10.
Stranded cable must be ferruled to
insert into push in connections.
5. The controller cable is then
connected from the heat pump to
the wiring centre (see wiring
diagrams in Appendix C and D).
Figure 10: Heat pump electrical connections