Regulus RTC 12i User manual

www.regulus.eu
RTC 12i
RTC 12i
EN
RTC 12i Heat Pump
Installation and Operation Manual

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Installation and Operation Manual RTC 12i - www.regulus.eu
CONTENTS
1. GENERAL INSTRUCTIONS .................................................................................................... 3
1.1 Related Documentation .............................................................................................. 3
1.2. Safety Instructions ..................................................................................................... 3
1.3. Cleaning & Maintenance ............................................................................................ 3
2. CONNECTION VARIANTS ...................................................................................................... 3
2.1. Direct connection to a heating system, DHW heating in a hot water storage tank ........... 4
2.2. Connection with a thermal store (combination with other renewable heat sources) .. 4
3. CONSTRUCTION READINESS & INSTALLATION ................................................................ 4
3.1. Scope of supply ......................................................................................................... 5
3.2. Installation preparation and transport ........................................................................ 5
3.3. Minimum distances .................................................................................................... 6
3.4. Placement of the heat pump ...................................................................................... 7
3.5. Condensate drain ...................................................................................................... 8
3.6. Pipe installation ......................................................................................................... 9
3.7. Electrical wiring .......................................................................................................... 9
4. COMMISSIONING .................................................................................................................. 10
4.1. Initial start up ............................................................................................................. 10
4.2. Troubleshooting ......................................................................................................... 10
APPENDIX .................................................................................................................................. 11
Expanded view ................................................................................................................. 11
Internal wiring diagram ..................................................................................................... 12

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Installation and Operation Manual RTC 12i - www.regulus.eu
1. GENERAL INSTRUCTIONS
Read this manual carefully before operating and retain it for future reference. In case of loss, the
manual can be downloaded in pdf format from http://www.regulus.eu/.
1.1. Related Documentation
-Instructions for installation and operation of the heating controller according to the selected
application. Connection variants are shown in Chapter 2.
- Instructions for installation and operation of components that belong to the equipment (hot
water storage tanks, thermal stores, valves and actuators, etc.).
- Heat Pump Commissioning Report - issued by an authorized person authorized by the service
organization.
1.2. Safety Instructions
- Turno󰀨thepowerwithanomnipolarswitchbeforedoinganyworkontheproduct.
- The heat pump must be connected to protective earth.
- TheproductisclassiedasIPX4.
- When handling the product with a hoist ring or similar device, make sure that the lifting
equipment, eyebolts and other parts are not damaged. Never stand under the hoisted product.
- Never jeopardise safety by removing bolted covers, hoods or similar.
- Never jeopardise safety by deactivating safety equipment.
- Any work on the product’s cooling system should be carried out by authorised personnel only.
- Theproduct’selectricalsystemsshouldonlybeinstalledandservicedbyaqualiedelectrician.
- If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or
 similarlyqualiedpersonsinordertoavoidahazard.
- This device can be used by children from the age of eight years and above and by people
with reduced physical, sensory or mental ability or lack of experience or knowledge if they
have been taught, either with supervision or with the instructions provided, how to use the
device safely and understand the risks involved. Children should not play with the device.
Cleaning and maintenance should not be carried out by children without supervision.
- If these instructions are not followed when installing, operating and maintaining the system,
manufacturer’s commitment under the applicable warranty terms is not binding.
1.3. Cleaning & Maintenance
- Use a wet cloth to clean the outer metal and plastic parts. Do not use abrasive cleaners or
solvents.
- Check the condensate drain regularly (visual check).
- The condensate tray is included in the delivery of the heat pump. The delivery also
includes a heating cable intended for installation in a condensate tray. A heating cable
for the condensate drain pipe (code 18491) can be ordered as an optional accessory.
- Protect the air inlets and outlets from snow, fallen leaves and other dirt. Check them regularly,
and remove dirt with a soft brush very carefully if needed.
- Thefanstopsduringdefrosting.Waterowsfromtheevaporatorandhissesareheard.Steam
may escape from the heat pump. After defrosting, the fan starts again and the heat pump
returns to normal operation.
- The heat pump is NOT subject to regular refrigerant leakage checks.

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Installation and Operation Manual RTC 12i - www.regulus.eu
2. CONECTION VARIANTS
The heat pump is part of the energy system of the house. The correct design of a heat pump
depends on the energy needs of the building and should be carried out by a specialist. These
methods of connection are the most commonly used and serve as a basis for the project. If project
documentation exists, follow it.
2.1. Direct connection to a heating system, DHW heating in a hot water storage tank
The accessory is represented by an additional heat
source in the form of an in line heater (code 16166)
equipped with an electric heating element of up to 7.5
kW output and an optional indirect heated hot water
storage tank with a heat exchanger surface of min. 1.5
m2(e.g. Regulus RDC 300 – code 12759). The larger
the heat exchange area of the HW storage tank, the
faster the DHW heating will be and the heat pump will
be able to prepare hot water more economically, or it will
be able to heat DHW to a higher temperature.
Inthisdirectconnectiontotheheatingsystem,itisnecessarytokeeptheminimumowthrough
the heat pump at the level of min. 1335 l/h (0.37 l/s)withsu󰀩cientheatsupplyfordefrosting,i.e.it
isnecessarytohaveapartoftheheatingsystemwithoutshut-o󰀨valvesinstalled,e.g.thermostatic
valves. Approximately it is at least 5 radiators of normal size (e.g. 0.6 x 0.9 m), or at least 30 m2of
underoorheatingwithoutthepossibilitytobeshuto󰀨.
For system control, it is necessary to use an IR 14 RTC smart controller which controls the
entire heating and hot water system. It is equipped with an integrated web server permitting
control through a web browser, or via a smartphone or tablet with the IR Client application
(for Android and iOS).
2.2. Connection with a thermal store (combination with other renewable heat sources)
The accessories consist of a thermal store for heating only
(Regulus PS series), or a combination thermal store with
immersed DHW tank (Regulus DUO series), or a thermal store
with stainless steel tube DHW exchanger (Regulus HSK series).
TThis connection is suitable for combining a heat pump with
otherheatsources,suchasbiomassboilers,replaceinserts
and stoves with a hydronic heat exchanger, solar thermal
systems, solar photovoltaic systems, etc. The thermal store
shall be sized depending on the selected type and output of the
combined heat source, e.g. for combination with PV panels, the
total volume of the thermal store can be calculated using the
relationship 180 l / 1 kWp PV output. For example, for an array
of PV panels with a peak output of 5 kWp, the tank volume shall be 900 litres. Always have the size
and type of the thermal store determined by a specialist!
For system control, it is necessary to use an IR 14 RTC smart controller which controls the
entire heating and hot water system. It is equipped with an integrated web server permitting
control through a web browser, or via a smartphone or tablet with the IR Client application
(for Android and iOS).

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Installation and Operation Manual RTC 12i - www.regulus.eu
3. CONSTRUCTION READINESS & INSTALLATION
The installation may only be carried out by a person with a valid manufacturer‘s authorization. If any
of the subsidy titles are used to acquire a subsidy for the heat pump (e.g. boiler subsidies, or the New
Green Savings program), the installation company must meet the requirements of current legislation.
3.1. Scope of supply
- RTC 12i Heat Pump
- Installation and Operation Manual
- 2 compensators to protect the heat pump heat exchanger against frost rupture
- 2 G 1“M nipples incl. gaskets
3.2. Installation preparation and transport
Theinstallationmustbecarriedoutbyaqualiedpersoninaccordancewiththeapplicablestan-
dards and all regulations concerning occupational safety must be observed.
- The heat pump shall be transported and stored in an upright position only.
- Check that the product has not been damaged in transit. Report any transport damage to the
carrier.
- Transport the unit to the installation site before removing the packaging.
- Move the product with a pallet truck or forklift if possible.
- It is possible to use lifting straps tied around the pallet, however only if the packaging (the
wooden frame) had not been removed.
- MIND THE DIFFERENT WEIGHT OF THE RIGHT AND LEFT SIDE OF THE HEAT PUMP!

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Installation and Operation Manual RTC 12i - www.regulus.eu
3.3. Minimum distances
The heat pump itself is intended for outdoor
installation, it is usually placed to the outer wall of the
building, with the fan facing away from the building.
At least 2 m of free space must be maintained in
front of the heat pump. The location must be chosen
so that the air can flow completely freely through
the heat pump. Used cold air should not be sucked
again into the inlet on the back as this will cause
the performance parameters of the heat pump
deteriorate.
The heat pump does not need an additional roof.
If the product is placed in an area where it will be
exposed to particularly harsh weather conditions or
if there is a risk of damage from snow falling from a
roof, the product can be installed underneath a small
awning.
Follow the recommendations below when choosing
a heat pump location:
Location: make sure that the heat pump does not
disturb you or your surroundings with noise, avoid
installation at a bedroom window, patio or fence;
if possible, we recommend not installing the heat
pump in a corner; when placed in a corner, the
resulting sound pressure level may increase due to
reflections from the surrounding walls.
Material of surrounding surfaces: avoid using
materials with increased sound reflectivity; it is
unsuitable, for example, to line the surrounding
surfaces with ceramic tiles.

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Installation and Operation Manual RTC 12i - www.regulus.eu
3.4. Placement of the heat pump
a) Installation on concrete blocks
The heat pump is placed on the
legs at the factory and exibly
mounted on anti-vibration rubber
silent blocks. The heat pump
supplied in this way shall be
installed on concrete blocks. The
foundations of concrete blocks
should reach a frost-free depth.
The heat pump is placed on the
prepared foundation structure
and levelled with a spirit level
so that it is placed perfectly
horizontally. It is not necessary
to anchor the heat pump to the
base or to the outer wall of the
building.
b) Installation on wall brackets
The other option is to place
the heat pump on the house
structure using wall brackets
(code 17458).
Before mounting the bracket
on the wall, it is important to
verify its load-bearing capacity.
Depending on the composition
and thickness of the wall, it is
recommended to use a chemical
anchor or a through-wall anchor
for installation.
The brackets are galvanized and
the complete support is supplied
including steel ropes ensuring its
spatial rigidity.
Follow the instructions for the
wall mounting brackets.
Prior to placing the heat pump
on the brackets, unscrew the
silent blocks (30 mm high) that
come with the heat pump from
production and replace them
with silent blocks designed for
brackets (40 mm high). These
silent blocks are included in the
supply of wall mounting brackets.
Level the heat pump with a spirit
level so that it is placed perfectly
horizontally.
Wall brackets (code 17458)
condensate
drain
Ø40 mm
condensate
tray
concrete
blocks
coarse crushed stone,
32-63 mm
frost-free
depth
moisture barrier
condensate
drain
Ø40 mm
condensate
tray
condensate drain
Ø40 mm
condensate drain
Ø40 mm
P-trap

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Installation and Operation Manual RTC 12i - www.regulus.eu
3.5. Condensate drain
Water condensation normally occurs during heat pump operation; up to 50 litters of condensate can
be generated per day, depending on the operating conditions. The heat pump is equipped with a
condensate tray. A heating cable is installed in the condensate tray as a protection against freezing.
The condensate tray shall be connected to a drain pipe for condensate drainage. If necessary, it is
possible to place a heating cable in the drain pipe. The heating cable to the drain pipe is not included
in supply and can be ordered as an optional accessory (code 18491).
The drain pipe can be run:
a) to the ground to a frost-free depth –theoutletandthespacearoundthepipemustbelled
withcrushedstonetoensuresu󰀩cientcondensatedrain,theundergroundsectionofthepipecan
be perforated,
b) into the building, in its sewage system – the through-wall passage shall be above the ground
and a water trap shall be installed inside (see Fig. below),
c) to the building’s drainage system, e.g. downpipe drains or eaves
It is recommended to insulate the drain pipe with thermal insulation.
vana pro sběr kondenzátu
odvod kondenzátu Ø 40 mm
condensate tray
condensate drain Ø 40 mm
condensate
drain
P-trap

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Installation and Operation Manual RTC 12i - www.regulus.eu
3.6. Pipe installation
The hydraulic connection of the heat pump may only
becarriedoutbyaqualiedspecialist.
The horizontal sections of the connecting pipe shall
always be routed so that they can be air bled. The
connecting pipe shall be insulated. Pipes laid in the
exterior of the building shall be provided with thermal
insulation resistant to moisture with a minimum
thickness of 19 mm. Indoors the piping shall be
provided with insulation at least 13 mm thick.
The connection dimensions of the heat pump pipes
are G 1“ F. Compensators shall be tted to these
pipes to increase the frost protection of the heat
pump heat exchanger. Compensators are included
in supply. A G 1“ M nipple, which is included in supply
(incl. gaskets), is used to connect the heat pump
outlet pipe to the compensator.
To limit the transmission of vibrations to the house
structure, it is recommended to connect the heat
pumpusingbraideddi󰀨usion-tighthosesofsuitablelength.Hosesareincludedinthedeliveryonly
forheatpumpssuppliedasaSpecialO󰀨er,otherwisetheymustbeorderedseparately.Braideddif-
fusion-tight hoses with F/F or M/F threads for RTC 12i heat pumps can be ordered in lengths of 500,
700 and 1000 mm. To eliminate the transmission of vibrations to the adjoining pipeline and possibly
also to the house structure, it is recommended to run the braided hose loose in a slight bend.
When installing compensators and braided hoses, follow the instructions in the separate Installation
Manuals that will come with these products.
Continue after the braided hose with copper, stainless steel or other pipes of suitable size. The
appropriatedimensionofthepipeisprescribedbytheheatingdesigner,thedimensionspeciedby
him is binding and must be observed during installation. Below are only indicative recommended
pipe dimensions:
Distance
(total length of piping) < 30 m 30 - 40 m > 40 m
Indicative recommended
pipe diameter Cu 28x1,5 (DN25) Cu 35x1,5 (DN32) Calculation needed
Forthecorrectoperationofthedevice,itisnecessarytokeeptheminimumowthroughtheheat
pump at the level of min. 1335 l/h (0.37 l/s).
3.7. Electrical wiring
Electricalconnectionandanyinterventionsinitmayonlybecarriedoutbyaqualiedpersonwith
the appropriate authorization!
 - Checkthatthepowersupplytotheutilityroomissu󰀩cientandinaccordancewith
the project documentation, resp. according to valid standards and regulations. The
cross-section of the supply cable for the entire heating technology depends on the
application and the output of the auxiliary heat source.
- Connection of other devices (IR14 RTC controller, auxiliary heat source, circulation
pumps, valve actuators, etc.): connect according to the relevant instructions or project
documentation.
ow, warm out
return, cold in
condensate
drain

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Installation and Operation Manual RTC 12i - www.regulus.eu
4. COMMISSIONING
4.1. Initial start up
Commissioning must be carried out by a service provider with a valid authorization issued by
REGULUS.
Commissioning checklist:
- Checkthattheheatpumpandsystemarelledwithwater,airbled.
- Check connections for leaks.
- Check that both the sensors and the circulation pump are connected to the power supply.
- Switch on the heat pump through the controller.
- When the system heats up, check that the connections are properly tight, the system is
vented, supplying heat and possibly hot water (heating test and leak test).
- Set the required heating curves and time programs.
- Inform the future user about the location of the main switches, circuit breakers and their
function.
- Inform the future user about other safety features and indicators (safety valves, pressure
gauges, analogue thermometers, etc.) and their functions.
- Inform the future user about the controller control, user menu, etc.
Theserviceprovidershallllinthe Checklist and the heat pump owner shall sign it.
4.2. Troubleshooting
If a fault occurs, you should always contact the installation company that installed your unit. If the
supplier considers that the fault is caused by a material or design defect, the installation company
will contact the supplier and repair the defect. Always report the serial number of the heat pump
(indicated on the label on the back of the heat pump).
Air in system
If you hear a raspy sound from the heat pump, make sure that it is completely air bled. If necessary,
top up the system to operating pressure. If the problem persists, call a technician to determine the
cause.
Error messages
All error messages and information texts are displayed on the controller that controls the heat pump.
For more information, consult the instructions for the corresponding controller.
Heating water circulation
If the circulation between the indoor unit and the outdoor unit slows down or stops completely, the
high pressure switch closes. Possible causes are:
- defective / undersized circulation pump
- air in pipes
- clogged condenser
- otherobstaclestowaterow
Defrosting
The fan stops during the defrosting cycle, but the compressor is still running. Melted ice ows
into the condensate tray under the heat pump. As soon as defrosting is completed, the fan starts
up again and a cloud of fumes formed by moist air may form for a short time. This is a perfectly
normal phenomenon that disappears after a few seconds. On frosty days, check for ice in unusual
places (heat pump legs, condensate tray, fan, etc.). Possible causes can be: defective defrosting
automation, lack of refrigerant (leakage), extreme weather conditions.

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Installation and Operation Manual RTC 12i - www.regulus.eu
APPENDIX
Exploded View
Pos. Name Pos. Name Pos. Name
1Cover grille 14 Liquid refrigerant
separator 27 PFC, power factor correction
2Front cover panel 15 Suction gas sensor 28 Electronic expansion valve
actuator
3Front of fan housing 16 Hot gas sensor 29 Condensate tray
4Fan propeller 17 Compressor 30 Legs for RTC 12i
5Fan motor 18 Wiring box cover 31 Heating element
6Connecting part 19 Electric wiring box 32 Condenser heating
element
7Rear of fan housing 20 Side cover panel 33 Four-way valve
8Support 21 Refrigerant collector 34 Electronic expansion valve
sensor
9Installation box 22 Bottom cover panel 35 High pressure sensor
10 Top cover panel 23 Liquid refrigerant sensor 36 Low pressure sensor
11 Finned heat exchan-
ger - evaporator 24 Plate heat exchanger -condenser 37 High pressure switch
12 Outdoor temperature
sensor 25 Water temperature sen- sors
13 Ba󰀪e 26 Condenser mounting part

©2021 We reserve the right to errors, changes and improvements without prior notice.
REGULUS spol. s r.o.
E-mail: [e-mail]
Web: www.regulus.eu
v1.0-10/2021
Internal Wiring Diagram power supply communication
suction gas sensor
hot gas sensor
low pressure
switch
high pressure
switch
green/yellow
green/yellow
owswitch
temperature sensor
return temperature sensor
owtemperature sensor
suction gas sensor
outdoor temperature sensor
temperature sensor
hot gas sensor
low pressure sensor
high pressure sensor
PFC power
factor
correction
red
blue
black
condenser
heater
compressor
heater
4-way valve
transformer
Compressor PCB
PCB with PFC
RTC PCB