Dimplex LI 1422C User guide

Order no.: 452170.66.01-EN EN · FD 0303
LI 1422C
LI 1826C
Installation and
Operating Instruction
Air-to-Water
Heat Pump for
Indoor Installation
Glen
Dimplex
Deutschland
Dimplex

www.dimplex.de 452170.66.01-EN · FD 0303 EN-1
LI 1422C - 1826C English
Table of contents
1 Safety notes..................................................................................................................................................EN-2
1.1 Symbols and markings...................................................................................................................................................EN-2
1.2 General safety information ...........................................................................................................................................EN-2
1.3 Intended use......................................................................................................................................................................EN-3
1.4 Legal regulations and directives .................................................................................................................................EN-3
1.5 Energy-efficient use of the heat pump.....................................................................................................................EN-3
2 Intended use of the heat pump ...............................................................................................................EN-4
2.1 Area of application...........................................................................................................................................................EN-4
2.2 Operating principle..........................................................................................................................................................EN-4
2.3 Functional description for integrated thermal energy metering. ....................................................................EN-4
3 Scope of supply ...........................................................................................................................................EN-5
3.1 Basic device .......................................................................................................................................................................EN-5
3.2 Switch box ..........................................................................................................................................................................EN-5
3.3 Heat pump manager .......................................................................................................................................................EN-5
4 Transport .......................................................................................................................................................EN-6
5 Installation ....................................................................................................................................................EN-8
5.1 General.................................................................................................................................................................................EN-8
5.2 Condensate pipe ..............................................................................................................................................................EN-8
5.3 Sound ...................................................................................................................................................................................EN-8
6 Assembly .......................................................................................................................................................EN-9
6.1 General.................................................................................................................................................................................EN-9
6.2 Air connection ...................................................................................................................................................................EN-9
6.3 Connection on heating side ...................................................................................................................................... EN-10
6.4 Water Quality in Heating Systems........................................................................................................................... EN-10
6.5 Electrical connection ................................................................................................................................................... EN-12
7 Commissioning ......................................................................................................................................... EN-13
7.1 General.............................................................................................................................................................................. EN-13
7.2 Preparation...................................................................................................................................................................... EN-13
7.3 Procedure ........................................................................................................................................................................ EN-14
8 Cleaning / maintenance ......................................................................................................................... EN-14
8.1 Care.................................................................................................................................................................................... EN-14
8.2 Cleaning the heating system .................................................................................................................................... EN-15
8.3 Cleaning the air system............................................................................................................................................... EN-15
9 Faults / troubleshooting......................................................................................................................... EN-15
10 Decommissioning/disposal ................................................................................................................... EN-15
11 Device information .................................................................................................................................. EN-16
12 Product information as per Regulation (EU) No 813/2013, Annex II, Table 2........................... EN-18
13 Dimension Drawings................................................................................................................................ EN-20
13.1 Dmension Drawing ....................................................................................................................................................... EN-20
14 Diagrams .................................................................................................................................................... EN-21
14.1 Characteristic curves for heating operation LI 1422C ..................................................................................... EN-21
14.2 Characteristic curves for cooling operation LI 1422C ..................................................................................... EN-22
14.3 Characteristic curves for heating operation LI 1826C ..................................................................................... EN-23
14.4 Characteristic curves for cooling operation LI 1826C ..................................................................................... EN-24
14.5 Operating limits diagram heating ............................................................................................................................ EN-25
14.6 Operating limits diagram cooling LI 1422C ......................................................................................................... EN-26
14.7 Operating limits diagram cooling LI 1826C ......................................................................................................... EN-27
15 Integration diagram ................................................................................................................................. EN-28
15.1 Hydraulic integration diagrams ................................................................................................................................ EN-28
15.2 Hydraulic integration diagrams ................................................................................................................................ EN-29
15.3 Legend.............................................................................................................................................................................. EN-30
16 Declaration of Conformity ..................................................................................................................... EN-31

EN-2 452170.66.01-EN · FD 0303 www.dimplex.de
English LI 1422C - 1826C
1Safetynotes
1.1 Symbols and markings
Particularly important information in these instructions is
marked with CAUTION! and NOTE.
CAUTION!
!
!
Immediate danger to life or danger of severe personal injury or
significant damage to property.
NOTE
º
ºººº
Risk of damage to property or minor personal injury or
important information with no further risk of personal injury
or damage to property.
1.2 General safety information
The following warnings and safety notes must be observed in
all life phases of the device:
CAUTION!
!
!
Work on the heat pump must only be performed by
authorised and qualified after-sales service technicians!
CAUTION!
!
!
Failure to use personal protective equipment could result in
severe injury. Risk of injury!
Use of personal protective equipment (PPE) in
accordance with DGUV regulation 100-500 Chap. 2.35
Personal protective equipment consisting of safety
gloves, safety shoes, safety glasses and long, closed
clothing must be used.
CAUTION!
!
!
There is a risk of falling or slipping on trip hazards and leaking
operating materials. Risk of injury!
Trip hazards caused by cables, pipes and hoses must be
avoided.
Operating material leaks must be absorbed with suitable
binding agents and disposed of in accordance with the
hazard class.
CAUTION!
!
!
Before opening the device, ensure that all circuits are
powered down.
CAUTION!
!
!
Failure to observe the safety rules could result in electric
shock. Danger to life!
National and regional regulations on accident prevention
and carrying out electrical installations must be observed.
The five safety rules must be applied when carrying out
electrical installations:
- Disconnect,
- Secure against being switched on again,
- Ensure that there is an absence of voltage at all poles.
- Earth and short circuit,
-Cover or cordon off neighbouring live parts. After
disconnecting the power supply, you have to wait 5
minutes before all components are de-energised.
CAUTION!
!
!
It is forbidden to operate the heat pump without safety
devices (cover, grating).
CAUTION!
!
!
Please refrain from tampering with or altering the device.

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LI 1422C - 1826C English
1.3 Intended use
This device is only intended for use as specified by the manu-
facturer. Any other use beyond that intended by the manufac-
turer is prohibited. This requires the user to abide by the rele-
vant project planning documents.
1.4 Legal regulations and directives
This heat pump is designed for use in a domestic environment
according to Article 1, Paragraph 2 k) of EU directive 2006/42/
EC (Machinery Directive) and is thus subject to the require-
ments of EU directive 2014/35/EU (Low Voltage Directive). It is
thus also intended for use by non-professionals for heating
shops, offices and other similar working environments, agricul-
tural establishments and hotels, guest houses and other resi-
dential buildings.
The construction and design of the heat pump complies with all
relevant EU directives, and DIN/VDE regulations (see CE decla-
ration of conformity).
When connecting the heat pump to the power supply, the rele-
vant VDE, EN and IEC standards are to be adhered to. Any fur-
ther connection requirements stipulated by local utility compa-
nies must also be observed.
When connecting the heating system, all applicable regulations
must also be adhered to.
This unit can be used by children aged 8 and over and by per-
sons with limited physical, sensory or mental aptitude or lack of
experience and/or knowledge, providing they are supervised or
have been instructed in safe use of the unit and understand the
associated potential dangers.
Children must not play with the device. Cleaning and user
maintenance must not be carried out by children without su-
pervision.
NOTE
º
ºººº
When operating or maintaining a heat pump, the legal
requirements of the country where the heat pump is operated
apply. Depending on the refrigerant fill quantity, the heat
pump must be inspected for leaks at regular intervals by a
certified technician, and these inspections must be recorded.
More information can be found in the accompanying log book.
1.5 Energy-efficient use of the heat
pump
With the purchase of this heat pump, you are helping to protect
the environment. A prerequisite for energy-efficient operation
is the correct design of the heat source system and heating sys-
tem.
To maintain heat pump efficiency, it is particularly important to
keep the temperature difference between the heating water
and heat source to a minimum. For this reason, it is advisable to
design the heat source and heating system very carefully. A
temperature difference of approx. 1 Kelvin (1 °C) increases
the power consumption by around 2.5 %. When designing
the heating system, it should be borne in mind that special con-
sumers such as domestic hot water preparation should also be
taken into consideration and dimensioned for low tempera-
tures. Underfloor heating systems (panel heating) are opti-
mally suited for heat pump use on account of the low flow tem-
peratures (30 °C to 40 °C).
It is important to ensure that the heat exchangers are not con-
taminated during operation, as this increases the temperature
difference, which in turn reduces the coefficient of perfor-
mance (COP).
When set correctly, the heat pump manager is also an essential
factor in the energy-efficient use of the heat pump. Further in-
formation can be found in the heat pump manager operating
instructions.

EN-4 452170.66.01-EN · FD 0303 www.dimplex.de
English LI 1422C - 1826C
2 Intended use of the heat
pump
2.1 Area of application
The air-to-water heat pump is to be used exclusively for the
heating and cooling of heating water. It can be used in new or
existing heating systems.
The heat pump is suitable for mono energy and bivalent opera-
tion in outside air temperatures to -22 °C.
Proper defrosting of the evaporator is guaranteed by maintain-
ing a heating water return temperature of more than 22 °C
(+2 °C/-0 °C) during continuous operation.
The heat pump is not designed for the increased heat con-
sumption required when a building is being dried out. For this
reason, the additional heat consumption should be met using
special devices provided by the customer. If a building is to be
dried out in autumn or winter, we recommend installing an ad-
ditional electric heating element (available as an accessory).
In cooling operation, the heat pump is suitable for air tempera-
tures ranging from +15 °C to + 45 °C. It can be used for silent
and dynamic cooling. The minimum cooling water inlet temper-
ature see “Device information” on page 16.
NOTE
ººººº
The device is not suitable for operation with a frequency
converter.
2.2 Operating principle
Heat
Outside air is drawn in by the ventilator and fed via the evapora-
tor (heat exchanger). The evaporator cools the air, i.e. extracts
heat from it. This extracted heat is then transferred to the work-
ing medium (refrigerant) in the evaporator.
The heat is "pumped" to a higher temperature level by increas-
ing its pressure with the aid of the electrically driven compres-
sors. It is then transferred to the heating water via the liquefier
(heat exchanger).
Electrical energy is used to raise the temperature level of the
heat from the environment. Since the energy extracted from
the air is transferred to the heating water, this type of device is
referred to as an air-to-water heat pump.
Main components of the air-to-water heat pump are the evapo-
rator, fan, expansion valve, 4-way reversing valve, as well as the
compressor, the liquefier and the electrical control system.
At low ambient temperatures, humidity accumulates on the
evaporator in the form of frost, reducing the transfer of heat.
Uneven accumulation during this process does not indicate a
fault. The evaporator is defrosted automatically by the heat
pump as required. Under certain atmospheric conditions,
steam may be emitted from the air outlet.
Cooling
The functions of the evaporator and the liquefier are reversed in
the "Cooling" operating mode.
The heating water transfers its heat to the refrigerant via the liq-
uefier, which is now functioning as an evaporator. The refriger-
ant is brought to a higher temperature level using the compres-
sor. Heat is transferred to the surrounding air via the liquefier
(which, in heating operation, functions as an evaporator).
2.3 Functional description for
integrated thermal energy
metering.
The compressor manufacturer’s performance specifications for
different pressure levels are stored in the heat pump software.
Two additional pressure sensors for determining the current
pressure level are installed in the refrigerating circuit, one be-
fore and one after the compressor. The current heat output can
be calculated from the compressor data stored in the software
and the current pressure level. The integral for the heat output
over the runtime gives the quantity of thermal energy supplied
by the heat pump, which is displayed separately for heating,
domestic hot water preparation and swimming pool water
preparation on the heat pump manager display.
The integrated thermal energy metering must not be used for
heating cost billing purposes. EN 1434 is not applicable.

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LI 1422C - 1826C English
3 Scope of supply
3.1 Basic device
The heat pump contains the components listed below.
The refrigeration circuit is "hermetically sealed" and contains
the fluorinated refrigerant R410A incorporated in the Kyoto
protocol. Information on the GWP value and CO2equivalent of
the refrigerant is available under “Device information”. The re-
frigerant is CFC-free, non-ozone depleting and non-combus-
tible.
1) Evaporators
2) Fan
3) Switch box
4) Dirt trap
5) Liquefier
6) Filter dryer
7) Compressor
3.2 Switch box
The switch box located in the device can be folded out once the
bottom front cover has been removed and the fixing screw has
been loosened.
The power supply terminals, power contactors, the soft starter
units and the extended controller unit (refrigeration circuit con-
trol) are inside the switch box. The refrigeration circuit control
monitors and controls all heat pump signals and communicates
with the heat pump manager.
Communication and control or mains cables, which should be
routed apart from each other, are fed into the switch box
through the cable entry area on the side plate.
3.3 Heat pump manager
The heat pump manager included in the scope of supply must
be used to operate the air-to-water heat pump.
The heat pump manager is a convenient electronic regulation
and control device. It controls and monitors the entire heating
system based on the outside temperature, as well as domestic
hot water preparation and safety systems.
Sensors for heating demand and outside temperature to be in-
stalled on site, including mounting material, are included with
the heat pump manager.
The functions and usage of the heat pump manager are de-
scribed in the operating instructions supplied with it.
1
2
4
3
5
6
7

EN-6 452170.66.01-EN · FD 0303 www.dimplex.de
English LI 1422C - 1826C
4Transport
CAUTION!
!!
Risk of injury when lifting and setting down the load. Risk of
crushing!
Do not stand under the load when lifting and setting
down.
CAUTION!
!
!
Risk of injury if unsuitable lifting devices are used incorrectly.
Risk of falling and crushing!
People may only stand outside the danger area.
(Germany: DGUV regulation 100-500 Chap. 2.3)
Observe the load capacity of the lifting devices and slings
used. (Germany: DGUV regulation 100-500 Chap. 2.8)
CAUTION!
!
!
Risk of the heat pump tipping over if unsuitable attachment
points are used. Risk of falling and crushing!
The heat pump may only be lifted from the operator side
with a lift truck or forklift.
CAUTION!
!
!
Work may only be carried out on the device outdoors in dry
weather conditions. Risk of damage to the device or electric
shock!
In wet weather conditions such as rain, snow etc., the
housing of the heat pump must be kept properly closed
CAUTION!
!!
Do not stand near the device during storms. Risk of lightening!
Do not stand in the immediate vicinity of the heat pump.
CAUTION!
!!
Weather-related conditions on transport routes. Risk of injury
due to slipping!
Transport routes must be kept clear and weather-related
conditions such as ice and snow must not impair safe
transport.
CAUTION!
!
!
The heat pump must not be tipped during transport. The
machine must be secured to prevent the risk of tipping.
A pallet should be used to transport the heat pump to its final
installation location. The basic device can be transported with a
lift truck, hand truck or by means of 3/4" pipes fed through the
holes in the baseplate or frame.
Before using the transport holes in the frame, it is necessary to
remove the lower side panel assemblies. This is done by loosen-
ing each of the two screws at the base and then withdrawing
the panels by unhooking them from above. Rehang the panels
by gently pushing them in an upwards direction.
Be careful not to damage any components when inserting the
pipes through the frame.
Any transport holes are to be covered at the installation location
using the 8 black dust caps, which are included in the device’s
accessories pack.
After transportation, the transport fastening in the device is to
be removed from both sides of the base.
NOTE
º
ºººº
Before commissioning, the transport fastening must be
removed.
Opening the cover Closing the cover

1.
1.
3.
2.

3.
1.
1.
2.
Remove
(2 screw)
transport lock

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LI 1422C - 1826C English
For easier transportation into existing homes/buildings, it is
possible to separate the basic device into two parts.
Once the covering panels have been removed, please proceed
as follows:
1) Drain refrigerant
2) Remove condensate hose
3) Loosen the switch box from the frame
4) Remove the pipe insulation above the soldering points
5) Separate 4x soldering points chip-free.
6) Disconnect the fan cable in the switch box
7) Unfasten 4x screws in the corners in each case
8) Lift down the top part of the heat pump
9) Areas for lifting on the frame
10) Transport heat pump to the installation location
11) Join the parts
12) Re-solder the separation points again (with inert gas flush-
ing)
13) Evacuate the refrigeration circuit
14) Add refrigerant
15) Perform leakage tightness test
16) Re-attach pipe insulation
17) Re-connect fan
18) Bores for attaching a transport aid (e.g. lifting straps etc.)
19) Remove the transport locks on the base on both sides be-
fore commissioning
NOTE
ººººº
Do not lift by the condensate tray. This cannot withstand any
forces.
NOTE
º
ºººº
The condensate hose must be removed before the upper part
is put down.
2
4+5
18
3
7
8
9
18
1237
758

EN-8 452170.66.01-EN · FD 0303 www.dimplex.de
English LI 1422C - 1826C
5Installation
5.1 General
The air-to-water heat pump must be installed in a frost-free, dry
room on an even, smooth and horizontal surface. The entire
base of the frame should lie directly on the floor to ensure an
adequate soundproof seal. If this is not the case, additional
sound insulation measures may be necessary. The heat pump
must be installed in a way that allows maintenance work to be
carried out without hindrance. This is ensured when observing
the distances to solid walls as shown in the figure.
NOTE
º
ºººº
The heat pump is not intended for use above 2000 metres
(mean sea level).
Never install the device in rooms subject to high humidity. Con-
densation can form on the heat pump and air circuit if the hu-
midity exceeds 50 % and the external temperature is below
0°C.
Neither frost nor temperatures higher than 35 °C must occur in
the installation room at any time of the year.
If the heat pump is installed on an upper storey, the load-bear-
ing capacity of the ceiling should be checked. On account of
the acoustics, measures for isolating possible vibrations should
also be very carefully planned in advance as well. Installation on
floors above wooden ceilings is not recommended.
5.2 Condensate pipe
Condensate that forms during operation must be drained off
frost free. To ensure proper drainage, the heat pump must be
mounted horizontally. The condensate pipe must have a mini-
mum diameter of 50 mm and must be fed into a sewer in such
a way that it is safe from frost. Do not discharge the condensate
directly into clearing tanks or cess pits. The aggressive vapours
and a condensate pipe laid in an area which is not frost-free can
destroy the evaporator.
5.3 Sound
To prevent solid-borne sound from being transmitted to the
heating system, we recommend connecting the heat pump to
the heating system using a flexible hose.
Installed air ducts should be sound-isolated from the heat
pump to prevent the transmission of solid-borne sound to the
ducts.
0,6 m
1m
0,2 m
0,6 m