EUROKLIMAT HERA H P EC/II 35-1-1 R290 400 50+230/1/50... User manual

HERA
Air-to-Water reversible Heat Pump for outdoor installation
Installation & Operation manual
Rel.: 2.0
09/03/2021
Manual Code:
99980311
EN
TRANSLATION OF ORIGINAL INSTRUCTIONS
ORIGINAL LANGUAGE: ITALIAN

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Revision History
Release
Date
Action
1.0
01/07/2019
First release
2.0
09/03/2021
Update
General Information
This manual contains the information needed to use and configure HERA Heat Pumps. It is valid for the following
models:
-HERA H *P/**/**/EC/II 35-1-1 R290 400/**/50+230/1/50
-HERA H *P/**/**/EC/II 55-1-1 R290 400/**/50+230/1/50
-HERA H *P/**/**/EC/II 65-1-1 R290 400/**/50+230/1/50
-HERA H *P/**/**/EC/II 80-1-1 R290 400/**/50+230/1/50
-HERA H *P/**/**/EC/II 95-1-1 R290 400/**/50+230/1/50
-HERA H *P/**/**/EC/II 110-2-2 R290 400/**/50+230/1/50
-HERA H *P/**/**/EC/II 130-2-2 R290 400/**/50+230/1/50
-HERA H *P/**/**/EC/II 160-2-2 R290 400/**/50+230/1/50
-HERA H *P/**/**/EC/II 190-2-2 R290 400/**/50+230/1/50
For Technical Support, please contact the company:
EUROKLIMAT S.p.A.
Via Liguria, 8 27010 Siziano (PV) ITALY
web: www.euroklimat.it
Phone + 39 0382 610282
email: [e-mail]

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WARNING
Before starting any operation read this manual and pay particular attention to Chapter 4 “SAFE HANDLING
OF HYDROCARBON REFRIGERANTS”providing information on flammable refrigerants.
WARNING:
The refrigerant R290 (Propane) is flammable and
it must be handled only by competent and
responsible operators, under the
conditions specified in the safety regulations in
force.

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Table of contents
1. UNIT IDENTIFICATION........................................................................................................................................................... 6
2. WARRANTY .......................................................................................................................................................................... 8
3. GENERAL AND BASIC SAFETY INFORMATION........................................................................................................................ 9
4. SAFE HANDLING OF HYDROCARBON REFRIGERANTS .......................................................................................................... 12
4.0 INTRODUCTION TO HYDROCARBON REFRIGERANTS .........................................................................................................12
4.1 THE SAFE WORKING ENVIRONMENT .................................................................................................................................13
5. EQUIPMENT ....................................................................................................................................................................... 15
6. SITE PROCEDURES FOR HC REFRIGERANTS.......................................................................................................................... 15
7. APPLICATION INFORMATION.............................................................................................................................................. 17
8. OIL TYPE / QUANTITY FOR EACH MODEL ............................................................................................................................ 17
9. LIMITS OF USE –MAXIMUM CHARGE SIZES ........................................................................................................................ 18
10. AUTHORIZED OPERATORS .................................................................................................................................................. 21
11. ATTACHED DOCUMENTS AND ASSISTANCE......................................................................................................................... 22
12. MAINTENANCE LOGBOOK .................................................................................................................................................. 23
13. TECHNICAL INFORMATION ................................................................................................................................................. 24
13.1.1 REFRIGERANT CIRCUIT DIAGRAM ......................................................................................................................................24
13.1.2 OPERATING CONDITIONS...................................................................................................................................................25
13.1.3 EFFICIENT DEFROSTING......................................................................................................................................................26
13.1.4 LIMITATIONS OF USE..........................................................................................................................................................26
14. TECHNICAL DATA AND DOCUMENTATION.......................................................................................................................... 29
15. SAFETY DEVICES ................................................................................................................................................................. 29
16. ACCESSORIES AND CONFIGURATIONS ................................................................................................................................ 31
17. HANDLING AND TRANSPORT.............................................................................................................................................. 39
17.1 GENERAL INFORMATION FOR STORAGE ............................................................................................................................39
17.2 GENERAL INFORMATION FOR TRANSPORT........................................................................................................................40
18. INFORMATION FOR STORAGE AND TRANSPORT OF HC FLAMMABLE GAS R290.................................................................. 41
19. HANDLING.......................................................................................................................................................................... 42
19.1 EXAMPLE OF LIFTING WITH A LIFT TRUCK..........................................................................................................................42
19.2 EXAMPLE OF LIFTING WITH ROPES ....................................................................................................................................43
20. POSITIONING AND OPERATING SPACE................................................................................................................................ 46
21. UNPACKING AND VISUAL INSPECTIONS OF THE UNIT ......................................................................................................... 48
22. INSTALLATION AND CONNECTIONS .................................................................................................................................... 49
22.1 INSTALLATION AREA AND SAFETY CONDITIONS ................................................................................................................49
22.2 WATER CONNECTIONS.......................................................................................................................................................50
22.3 DISCHARGE OF PRESSURE RELIEF VALVES FITTED ON REFRIGERANT CIRCUITS........................................................................ 51
22.4 PIPING INSTALLED AT SITE ................................................................................................................................................... 53
22.5 WATER PUMP..................................................................................................................................................................... 54
22.6 FLOW SWITCH .................................................................................................................................................................... 54
22.7 ELECTRICAL CONNECTIONS................................................................................................................................................. 54

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22.8 SAFETY CHECKS AND POWER SUPPLY LIMITATIONS ..........................................................................................................57
23. FILLING THE CIRCUITS, START-UP AND CONTROL PANEL..................................................................................................... 58
24. START-UP AND PRELIMINARY CHECKS................................................................................................................................ 60
25. PAUSE, SHUT-DOWN AND PROLONGED INACTIVITY ........................................................................................................... 61
26. MICROPROCESSOR AND MAIN COMMANDS ...................................................................................................................... 62
27. MAINTENANCE AND FAULTS .............................................................................................................................................. 63
27.1 GENERAL INFORMATION AND MAINTENANCE LOGICS......................................................................................................63
27.2 ROUTINE MAINTENANCE ...................................................................................................................................................64
27.3 SUPPLEMENTARY MAINTENANCE......................................................................................................................................67
28. CALIBRATIONS AND TROUBLESHOOTING ........................................................................................................................... 67
29. FINAL CONSIDERATIONS..................................................................................................................................................... 68
29.1 REPLACEMENT OF COMPONENTS......................................................................................................................................68
30.REPLACEMENT OF EQUIPMENT .......................................................................................................................................... 68
31. SHUTTING DOWN, DECOMMISSIONING AND DISPOSAL ..................................................................................................... 68
32. SAFETY DATA SHEETS ......................................................................................................................................................... 70
ANNEX A ..................................................................................................................................................................................... 84
ANNEX B –GAS DETECTOR INSTRUCTION MANUAL..................................................................................................................... 85
ANNEX C –CALIBRATION KIT FOR GAS DETECTOR INSTRUCTION MANUAL.................................................................................. 85

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1. UNIT IDENTIFICATION
The equipment can be identified by the “Identification Plate (EC)”
located on the machine. It contains the unit SERIAL number and the main
technical and performance data.
The serial number is essential for spare part requests or technical
assistance.
We advise you to make a note of the machine number and keep it in a
safe place.
The plate is always fixed on the machine to provide anyone accessing it
with the basic information about the equipment. In the event of damage
to the Identification Plate (EC) request a duplicate from the
Manufacturer’s Technical Assistance Office.
A further element of identification is represented by the “machine
model”, which allows the type of construction, important configurations
and general characteristics to be traced. The machine model can always
be found on the identification plate and by putting together the
information obtained from these two elements, it is possible to gain a
clear understanding of the equipment being used. The letters that make
up the code consist of various digits, each of which has a precise
meaning. The example shown below indicates, conceptually, the
contents of the code and the different potential applications.
Nonetheless, the Company reserves the right to change the letters
without notice.

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The below legend allows you to easily select the proper configuration of HERA heat pumps.
Model:
H = Air/Water Heat Pump
Electricity supply:
400/3N/50
400/3/50
Refrigerant:
R290 = Propane
Hydronic Kit:
B = Base
P = Base with pump
T = Base with tank
I = Integrated Size:
035-1-1
055-1-1
065-1-1
080-1-1
095-1-1
110-2-2
130-2-2
160-2-2
190-2-2
Heat Exchanger (user):
P = Plates
Compressor:
II = VFD Compressor
Fan:
EC = EC Fan
Noise:
LN = Low Noise
SL = Super Low Noise
XL = Extra Low Noise
Configuration:
AS = Standard
SL = Desuperheater
XL = Extra Low Noise
All configurable models comply with current European Directives and Regulations
and are accompanied by a declaration of conformity and a CE mark.
HERA H BP/LN/AS/EC/II 035-1-1 R290 400/3N/50

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2. WARRANTY
The machine that is the object of this manual is subject to the guarantee form described below, which is considered to have been
accepted and signed automatically by the client in the order phase to the Manufacturer with the signing in acceptance of the order
confirmation. The supplying company guarantees the excellent construction and quality of the supply, undertaking, at its own
discretion, during the guarantee period specified below, to repair or resupply, as soon as possible, parts containing acknowledged
faulty materials, construction or workmanship, which make them unsuitable for their intended purpose. The foregoing provided
there is no negligence by the buyer, damage caused by natural wear and tear, negligence or misuse by the user, damage caused
by third parties, force majeure or in any case damage from other causes not attributable to defects in constructional quality.
The supplier shall not be under any liability to compensate for direct or consequential damage of any nature or due to any reason
whatsoever. In the event of the equipment being repaired or modified in some way by unauthorized personnel, the guarantee will
automatically be invalidated. The aforesaid guarantee conditions apply if the customer has complied with all of the contract
obligations, particularly those regarding payments. It shall be understood that none of the Manufacturer’s employees, workers,
sales agents, service centers or anyone else is authorized to grant derogations from the terms of the general guarantee conditions
stated above. For further details, refer to the contract conditions stipulated at the time of purchase, which constitute the only
valid conditions.
Any assembly/disassembly carried out by the USER that is not contemplated in this manual or authorised by the
Manufacturer will be considered as tampering, thereby jeopardising the safety functions and invalidating the
warranty of the unit.

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3. GENERAL AND BASIC SAFETY INFORMATION
During the design and construction phase, the machine manufacturer has paid attention to aspects which may constitute a risk to the health
and safety of those working on it. Besides complying with the laws on the subject, he has adopted all the good construction technique rules.
Nevertheless, caution is essential and safety is also in the hands of those working with the equipment. Read the instructions contained in this
manual carefully.
Inserting this machine into a system requires an overall project that takes legal and regulatory aspects into account. Do not tamper with, ignore,
eliminate or bypass the safety devices installed on the unit. Failure to comply with this requirement may lead to serious risks for people’s health
and safety. The aid of one or more assistants may be necessary in some phases; in this case, it is necessary to provide appropriate training.
Keeping the equipment in conditions of maximum efficiency with programmed maintenance guarantees reliability and safety for operators.
Handle the machine using appropriate means and perform manoeuvres without risks to operators and people directly involved. Use the
equipment only for the uses foreseen by the manufacturer; any other use may cause risks to users. To sum up the above and highlight potential
risks related to improper handling of the unit, below is a list of the most important points and information or restrictions considered essential
for general safety.
Handling of flammable refrigerants requires specific safety rules which are provided in the next chapter. See 4
This operating and maintenance manual describes the construction, operation and directions for use and maintenance of the units made
by the Manufacturer.
The contents of this manual must be read and fully understood before managing the units. This usage and maintenance manual
illustrates the operation and rules of usage and maintenance of the machines according to the Manufacturer’s criteria.
The Manufacturer of the equipment declines all responsibility for injury or damage resulting from failure to comply with the regulations
reported herein.
In the event of clarifications, further information or doubts of any kind, the Manufacturer is available to provide all the relevant
instructions through his qualified technical personnel.
In order to facilitate identification and recognition of the machine, always refer to the technical data reported on the plate outside the
units and, in particular, the serial number.
The machine must not be used under conditions other than those for which it was designed, not even for limited periods of time. The
incorporation of parts, which do not guarantee safety, is strictly forbidden.
Under no circumstances may parts be inserted that do not guarantee safety.
The refrigerant fluid is R290. If inhaled in low concentrations may cause narcotic effects, dizziness, headache, nausea and loss of co-
ordination. In high concentrations may cause asphyxiation. Symptoms may include loss of mobility/consciousness. Victim may not be
aware of asphyxiation. The fluid is highly flammable. See 32 SAFETY DATA SHEETS at the end of the manual.
The lubricating oil chemical properties and related hazards are listed in the safety data sheet at the end of this manual. See 32 SAFETY
DATA SHEETS.
The procedures set out in the following chapters of this manual must be complied with for all work relating to installation, start-up, use,
modifications of conditions of use and operating modes, routine maintenance, inspections and periodic maintenance. This manual must
always be kept at hand for consultation.

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This machine must only be used under the conditions foreseen by this usage and maintenance manual. Below we wish to draw USERS’
attention to various recommendations to avoid abnormal conditions of use; nonetheless, all other conditions of use not expressly
foreseen by this manual must be avoided.
Always replace any damaged or missing supply lines of the various energy sources.
The unit is fitted with fixed guards to protect its components. When installed outdoors, a canopy must be provided to protect the unit
from snow, which could create risks during operation if it freezes on the fan blades. Respect the indication of POSITIONING AND
OPERATING SPACE.
Do not climb onto the machine. Do not operate the machine unless it has been installed correctly in the prescribed position. Do not
start the machine without closing the doors of the electrical panel properly.
Avoid getting close to the feed-in and air expulsion points. Do not clean the machine when it is in operation. Do not install the machine
in corrosive and/or explosive environments.
Do not disconnect or remove safety components. The machine must not be used under conditions other than those stated in this
manual.
Do not start the unit without the fixed guards correctly mounted. Do not remove the guards while the unit is in operation or when is
powered.
Analysis of residual risks
The manufacturer has made a precise analysis of the risks during the whole design and engineering phase of the product. However, despite the
careful design choices and targeted technical measures implemented, a few remaining residual risks should be taken into consideration.
Consequently, below is a list of the main residual risks and possible preventive action to be implemented.
-MECHANICAL RISKS:
▪Risks due to moving parts (LOW): Fans and all moving parts are protected by casing or grills. Besides that, even if fans are
protected by grills, during maintenance blades could be moved by wind: to ensure safety and avoid risks related to this
occurrence the blades must be mechanically blocked during maintenance. Before restarting the unit unblock the blades.
-ELECTRICAL RISKS: None, as operations on the electrical panel may only be carried out by qualified and authorized personnel according
to the regulation and danger signs shown on the panel, which can only be opened using a special key with the main switch in the “OFF”
position.
-THERMAL RISKS:
▪Risk of burns (MEDIUM): on the Heat pump, the refrigerant reaches extremely high temperatures and pressures. The Heat
pump is provided with protective panels and the sections of the circuit that are particularly critical for the risk of burns have
been positioned to reduce the possibility of accidental contact with these sections to a minimum. Other areas have been
especially insulated and protected with special material. The condensing coils can also reach very high temperatures.
This risk can be reduced by wearing appropriate clothing such as a work overall and gloves, which are suitable for the area
where the unit is installed.
▪Risk of inhalation and burns (LOW): the Heat pump is fitted with safety valves, which are activated automatically in the
event of pressure inside the refrigerant circuit exceeding a set threshold caused by anomalies or faults. When the threshold
is exceeded, the valve releases a quantity of gas at high pressure and temperatures into the atmosphere. Remember that
the activation of these devices is an infrequent but serious event, as it indicates a problem with the machine. The
manufacturer has taken all the design shrewdness to ensure valves to be positioned in a safe way, to avoid being hit directly
by the discharge jet. Besides that, also considering other risks related to the flammability of R290 refrigerant, all pressure
relief valves must be equipped with discharge piping to ensure gas to be released in a safe area. Discharge from pressure
relief devices shall take place so that persons and property are not endangered by the released refrigerant. Discharge lines
for pressure relief devices shall be calculated according to EN 13136. Further information regarding discharge piping of
pressure relief valves are given in chapter 22.3 DISCHARGE OF PRESSURE RELIEF VALVES FITTED ON REFRIGERANT of this
manual.
-DANGERS FROM NOISE OR VIBRATIONS: None.
-DANGERS FROM HARMFUL SOURCES (electricity, static electricity, magnetic fields, radiation, lasers etc.): None
-OTHER SOURCES HARMFUL TO HEALTH (dust, gases, water, steam, fluids, mists, smoke, fire explosion, biological and microbiological
substances, chemical etc.):
The Manufacturer declines any responsibility for eventual damages caused directly or indirectly
to persons or property as a consequence of lacked compliance with present instructions.

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▪Risks of explosion (LOW): The manufacturer has made a precise analysis of the risks of the product to minimize risks due to
the use of flammable refrigerants: in case of leakage, power supply to the unit is switched off, to avoid electrical sources of
ignition and an alarm is activated by the R290 Gas Detector, which has its separate power supply. Moreover, some
components are ATEX certified. However, care must be taken during maintenance or when a leakage is detected, as the
leakage could generate potentially flammable areas around the Heat pump. Follow the instructions contained in this manual
and see 4 SAFE HANDLING OF HYDROCARBON REFRIGERANTS
-ERGONOMIC RISKS (safety distances, ergonomic sizes and geometries, etc.):
▪Risk of cuts (MEDIUM): the Heat pump is an assembly of mechanical parts made of metal; consequently, there is a risk of
cuts or minor injuries caused by these parts (especially by the wings that make up the condensing coil). In order to reduce
the possibility of accidental contact with the parts to a minimum, you are strongly advised to wear appropriate clothing, such
as work overalls and gloves, which are suitable for the area where the unit is installed.
▪No other risks identified, provided the instructions and provisions relating to installation of the Heat pump, set out in this
manual, are complied with.
Personal protective equipment PPE
All workers involved in activities carried out near the Heat pump (whether the manufacturer’s technicians or a third parties) must be equipped
with appropriate personal protective equipment (PPE). The PPE used must comply with the national standards of reference and be in a good
condition. Damaged, worn or unfit PPE does not guarantee the requested and desired level of safety.
According to standard EN 378-3:2016 (Annex A), the extent of personal protective equipment and equipment for emergency use provided should
be agreed with the local rescue service (fire brigade). Personal protective equipment and equipment for emergency use should be regularly
checked and maintained in accordance with the manufacturer's recommendations. When defects or deficiencies are discovered, the equipment
should be replaced without delay.
The following PPE represents the minimum compulsory equipment:
-Protective gloves, according to the specific risks, for example: welding, electrical risk, cut protection.
-Safety shoes
-Work clothes, according to the specific risks, for example: welding, electrical repairs, painting.
-Safety helmet, in the event of having to carry out activities involving the handling of suspended loads or activities involving
the need to work at a raised height from the ground.
-Harnesses or safety belts, in the event of having to carry out activities involving the need to work at raised height from the
ground.
-Acoustic protection devices (earphones or earplugs), in the event of having to carry out activities with the machine in
operation where noise levels exceed the maximum exposure requirements with reference to the national regulations.
-Protective eyewear, in the event of having to carry out activities, such as paining and welding.
-All other safety equipment required according to the risk evaluation developed by the subcontractors.
It is recommended that the compulsory safety devices (PPE) are identified correctly and indicated in these areas.
The equipment for personal safety should be readily accessible and carefully located free from improper interference.

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4. SAFE HANDLING OF HYDROCARBON REFRIGERANTS
4.0INTRODUCTION TO HYDROCARBON REFRIGERANTS
Hydrocarbons are good, efficient refrigerants with a low environmental impact. They are typically used in integral (plug in) appliances, in Heat
pumps which cool a secondary fluid such as water or glycol, in the high stage of cascade systems and in split air conditioning systems.
Refrigerant grade hydrocarbons (i.e. specified by R number or CARE designation) are high purity substances suitable for use in refrigeration
systems. They are un-stanched and therefore have no smell. LPG (fuel gas) should not be used in refrigeration systems as the impurities will
damage compressors and other components.
The pressure temperature relationship at saturation conditions for HCs and other refrigerants is shown in here
below diagram.
Flammability and Other Hazards
Hydrocarbon refrigerants are potentially flammable.
Combustion occurs when an HC is mixed with air in the ratio between approximately 1.7 (Low Flammable Limit) and 10.8% (Upper Flammable
Limit).
-1
4
9
14
19
24
29
-40 -20 0 20 40 60
temp, °C
pressure, bar g
R404A
R1270
Care 50
R290
R134a
Care 30
R600a

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According to the basic concept of “Fire triangle” combustion may occur only if three elements are available:
-Oxygen
-Fuel
-Source of ignition (can be a spark or anything hotter than 470°C)
The following are sources of ignition:
▪Flames, e.g. from brazing torches, matches, cigarette lighters;
▪On / off switches, e.g. on electrical sockets, vacuum pumps, recovery machines;
▪Contactors;
▪Light switches;
▪Standard thermostats;
▪Standard compressor relays and overload protectors (klixon);
▪Standard pressure switches (high pressure, low pressure, oil differential pressure);
▪Standard light starters (ballasts);
▪Standard timers (e.g. for defrost) and controllers;
▪Most electronic leak testers.
Electrical devices which comply with EN60079 part 15 are not sources of ignition.
This includes, for example, Ex”n” rated motors.
Other hazards of HCs include:
▪Liquid HC can cause freeze burns so you must wear gloves and safety glasses when handling these refrigerants.
▪HCs are asphyxiants, are heavier than air and are un-stenched (odourless).
4.1THE SAFE WORKING ENVIRONMENT
Before carrying out work on a Heat pump, it is necessary to check that the surrounding area is suitable for proceeding with the planned
operations and that all the appropriate safety precautions have been taken.
In particular, before starting work on the system, it is necessary to carry out safety checks to ensure that the risk of injury or accidents is reduced
to a minimum.
Technical operators must always read this usage and maintenance manual carefully to ensure that they are aware of any particular, specific
requirements related to the equipment in question. For further details regarding specific training required for refrigeration technicians using
flammable refrigerant see 10 AUTHORIZED OPERATORS.

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For safe operation the following instructions must be practiced:
▪All members of staff and other workers in the area must be informed of the type of work carried out; all members of staff
responsible for maintenance must be trained and understand the implications of the presence of flammable refrigerant
gas; all technicians working with the refrigerant must be competent and authorized;
▪The area should be marked as Temporary Flammable Zone. Local supervisor should be notified of the zone existence. All
appropriate signs must be present;
▪All the necessary and appropriate equipment and instruments must be available;
▪Ensure the refrigeration equipment’s power supply has been discontinued;
▪Work outside or in a well-ventilated area: open doors and windows to create a through draft, or use a suitable ventilation
fan (see photo –the fan motor is Ex rated and the lead is 5 m long so it can be plugged in outside the 3m zone);
▪Working in confined spaces must be avoided and at least one escape route clear of obstacles must be guaranteed;
▪Make sure there is no source of ignition –flames and sparks –within 3 m (a typical safe area when working on
refrigeration systems). This includes light and socket switches, heaters, other unsealed electrical switches, lit brazing
torches;
▪Use a hydrocarbon gas detector to check if there is HC in the air before and while you work on the HC system. The photo
shows examples of suitable simple hand held devices which have a visual and audible indication of HC in air, at a
concentration as low as 20 ppm –0.1% of the lower flammability level;
▪No smoking within this area;
▪Equipment for extinguishing flames (CO2 or dry type) must be available and serviceable in the surrounding areas.
ATEX | Portable fan
Portable leak detector for HC
If you can’t work safely, DON’T.
If you are unsure of anything DO NOT PROCEED.
Stop work and ask the question!

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5. EQUIPMENT
Some standard tools and equipment can be used safely with HCs, including gauge manifold sets.
Standard vacuum pumps can be safely used after having checked that the only potential source of ignition is the on/off switch and
providing they’re used according to procedures listed herein (see Safety Procedure for HC refrigerants). HCs discharged by the pump
are usually safely dispersed and do not result in a flammable zone providing the pump is located in a well-ventilated area.
As an alternative, use ATEX certified vacuum pumps.
Standard recovery machines cannot be safely used to recover HCs: unlike vacuum pumps there are several sources of ignition (e.g.
on/off switches, relays, pressure switches). In addition, a leak would result in a flammable zone around the machine. These hazards
cannot be avoided; therefore, the correct recovery machine must be used as specified in the section on recovery.
Most electronic leak detectors used for HFC and HCFC leak detection are not safe and sensitive for use with HCs, so electronic
detectors specifically for flammable gases (or leak detection spray) must be used, as described in the section on leak testing.
6. SITE PROCEDURES FOR HC REFRIGERANTS
The table below is a guide for most common installation and service procedures, as indicates how these operations should be carried out on
HC systems with the aim to minimize ignition and explosion risks.
Leak testing
Best method –soapy water or leak detection fluid.
Most electronic refrigerant leak detectors are not safe for use with HCs.
Flammable (combustible) gas leak detectors, Ex rated, are available.
Do not use halide lamp (naked flame) leak detectors.
Vent or recover the refrigerant before repairing leaks.
Accessing systems without
service or Schrader valves
Best method –use a line tap valve to remove the refrigerant, then braze a Schrader connection onto
process tube or fit a Lokring connector to evacuate the system and charge refrigerant.
See below for information about un-brazing.
Recovering refrigerant
Use a suitable (safe) recovery machine (see photo).
The recovery cylinder must be labelled to show it contains a flammable
substance.
The connection to a power source must be made outside the Temporary
Hazardous Zone.
Do not mix HCs with other refrigerants.
Ensure the recovery cylinder is evacuated before filling.
Do not mix HCs with air in a cylinder: do not pull system into a vacuum to
prevent accidental ingestion of air into the recovery tank.
Do not overfill the recovery cylinder –a cylinder which will hold 10 kg of HFC
will only hold 4.5 kg of HC.

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Un-brazing and brazing
connections
Ensure the area is well ventilated.
Before un-brazing connections, follow one the procedure below.
Remove HC from both sides of the system. Where solenoid valves are fitted, ensure they are open, for
example by uing a magnet.
Wear gloves and goggles when brazing / un brazing.
1. Recover the HC from the system.
2. Run the recovery machine for as long as possible so the system is under vacuum and as much of the HC
charge is removed from the system as possible.
3. Note - the machine commonly used for HC recovery can only be run for 5 minutes with the low-
pressure switch bypassed, but this should be sufficient.
4. Fill the system with dry nitrogen to a slight positive pressure.
5. Release the pressure and leave the system connected to the vent line and open.
6. Un-braze connections.
When re-brazing connections, purge system with dry nitrogen. Ensure at least one access point is open to
atmosphere to eliminate pressure build up in the system.
Alternatively, cut pipe work and re-join using Lokring.
Replacing components
Use the correct type of electrical devices and compressor (original equipment manufacturer spares like for
like components must be used). Ensure electrical boxes are correctly re sealed as found before putting the
system back into operation. Do not modify components or relocate components.
Evacuation
Check that the on / off switch of the vacuum pump is the only source of ignition. If this is the case the vacuum
pump can be safely used with HC refrigerant if you use it respecting the following:
▪Do not use the switch on the vacuum pump –use an extension lead at least 3m long and control the
pump at the remote switch.
▪Ensure the vacuum pump is outside or in a well-ventilated area.
Charging refrigerant
Ensure good natural or forced ventilation.
Best method: charge by weight (using accurate scales) or volume.
For critically charged systems, an accuracy of +/-5% is usually required. Do not adjust refrigerant charges,
always use the manufacturers indicated charge.
HC charge = 45% of HFC charge by weight.
Use the correct refrigerant grade hydrocarbon (for HERA range is R290).
Evacuate or carefully purge lines before charging.
Sealing systems without
service or Schrader valves
Best method –capped Schrader valve, ideally with a blind flare nut.
If brazing the process tube, crimp it twice at 90° before brazing.
Systems can also be sealed using Lokring.
Identification
Label the system with a flammable gas sticker (Symbol ISO 3864-B.3.2 caution: risk of fire).
Standard gauges can be used when working on HC systems.
Use a comparator to find the HC saturation temperatures for the pressure you measure.

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7. APPLICATION INFORMATION
HCs are compatible with most materials used in systems and tools/equipment. The Manufacturer has made an in-depth analysis of chemical
compatibility with HCs of the materials used in the construction of the Heat pump. The oil provided with semi-hermetic reciprocating
compressors is specifically tested for use with HCs, the safety data sheet is provided at the end of the present manual. See table below have
an indication of oil charge for each model.
8. OIL TYPE / QUANTITY FOR EACH MODEL
Units with FRASCOLD compressor(s)
HERA model (1 circuit, 1 compressor)
35-1-1
55-1-1
65-1-1
80-1-1
95-1-1
Oil type
PAG68
PAG68
PAG68
PAG68
PAG68
Oil charge [L]
1,6
2,9
4,0
4,0
4,0
HERA model (2 circuits, 2 compressors)
110-2-2
130-2-2
160-2-2
190-2-2
Oil type
PAG68
PAG68
PAG68
PAG68
Oil charge [L x no. of compressors]
2,9 x 2
4,0 x 2
4,0 x 2
4,0 x 2
Units with BITZER compressor(s)
HERA model (1 circuit, 1 compressor)
35-1-1
55-1-1
65-1-1
80-1-1
95-1-1
Oil type
PAG68
PAG68
PAG68
PAG68
PAG68
Oil charge [dm3]
2,6
2,6
4,5
4,5
4,5
HERA model (2 circuits, 2 compressors)
110-2-2
130-2-2
160-2-2
190-2-2
Oil type
PAG68
PAG68
PAG68
PAG68
Oil charge [dm3x no. of compressors]
4,5
4,5
4,5
4,5
The safety data sheets for lubricating oils used in HERA heat pumps are listed at the end of this manual.

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9. LIMITS OF USE –MAXIMUM CHARGE SIZES
EN378-1:2016 (Refrigerating systems and heat pumps –safety and environmental requirements) specifies maximum charge levels and the
practical limit for HC refrigerants. Refer to EN378 for full details.
The amount of flammable refrigerant which can be used in systems is restricted and depends on a number of factors:
▪Location of equipment, e.g. below or above ground level
▪Occupancy of area being cooled, e.g. unrestricted access by the public or authorized access only
▪Type of system, e.g. direct expansion or secondary system
Location classification of refrigerating systems
There are four classes of location for refrigerating systems:
Class I –Mechanical equipment located within the occupied space
If the refrigerating system or refrigerant-containing parts are located in the occupied space, then the system is considered to be of class I unless
the system complies with the requirements of class II.
Class II - Compressors in machinery room or open space
If all compressors and pressure vessels are either located in a machinery room or in the open air then the requirements for a class II location
shall apply unless the system complies with the requirements of class III. Coils and pipework including valves may be located in an occupied
space.
Class III –Machinery room or open air
If all refrigerant-containing parts are located in a machinery room or open air then the requirements for a class III location shall apply. The
machinery room shall fulfil the requirements of EN 378 - Part 3. Indirect systems where the heat-transfer fluid is in direct communication with
an occupied space and a refrigerant leak into the indirect circuit can enter into the occupied space are considered to be located in location class
or II.
NOTE: A pressure relief device (or purges) on a secondary circuit is an appropriate method to prevent refrigerant leaking into the
occupied space.
Class IV - Ventilated enclosure
If all refrigerant-containing parts are located in a ventilated enclosure then the requirements for a class IV location shall apply. The ventilated
enclosure shall fulfil the requirements of EN 378-2:2016 and EN 378-3.
Occupancy of area
Class
Location where…
Examples
A –General access
People may sleep;
The number of people present is not
controlled;
Any person has access without being
personally acquainted with the personal
safety precautions
Hospitals
Prisons
Theatres, Lecture halls
Supermarket, Restaurant, Hotels
Ice rinks
B –Supervised access
Only a limited number of people may be
assembled, some of them being
necessarily acquainted with the general
safety precautions.
Laboratories
Places for general manufacturing
Office buildings
C –Authorized access
Not open to general public where only
authorized people are granted access.
Authorized persons are acquainted with
general safety precautions
Cold stores and abattoirs
Refineries
Nonpublic areas in supermarkets
Manufacturing facilities

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Considering that the refrigerant gas is propane (R290), the charge shall be determined according to flammability and toxicity class.
According to EU standards, R290 is classified as A3 refrigerants, which means high flammability and low toxicity (see table below).
The most critical charge is due to flammability class, and the value of it must be determined in accordance with the table below.
The table is from EN 378-1:2016.
Access
Category
Application
Installation
Location Classification
I
II
III
IV
A
Human comfort
All
According to C.2 and not more than 1 kg
Not more
than 5 kg
Refrigerant
charge not
more than
5 Kg
Refrigerant
charge not
more than
5 Kg
A
Other
applications
Below
Ground
Only sealed systems:
20 % × LFL × Room volume and not more than 1 kg
A
Other
applications
Above
ground
Only sealed systems:
20 % × LFL × Room volume and not more than 1.5 kg
B
Human comfort
All
According to C.2 and not more than 1.5 kg
Not more
than 10 kg
B
Other
applications
Below
Ground
20 % × LFL × Room volume and not more than 1 kg
B
Other
applications
Above
ground
20 % × LFL × Room volume and not more than 2.5 kg
C
Human comfort
All
According to C.2 and not more than 1.5 kg
No charge
restriction
C
Other
applications
Below
Ground
20 % × LFL × Room volume and not more than 1 kg
C
Other
applications
Above
ground
20 % × LFL × Room volume and
not more than 10 kg
20 % × LFL × Room volume and
not more than 25 kg
C.2 is defined by formula:
M = 2.5 x LFL1.25 x h x  A
Where:
M = max charge, kg
LFL = Lower flammability Limit, kg/m3, (0.038 for R290)
h = height of unit, m, (0.6 for floor mounted, 1.0 for window, 1.8 for wall, 2.2 for ceiling)
A = floor area, m2
HERA Heat Pumps are only suitable for installation in open air.

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HERA HEAT PUMPS
Maximum allowable
charge depends on:
Gas Classification
A3(High Flammability, Low Toxicity)
Application Type
Human Comfort
Equipment Location
Machinery room or open air
Installation Characteristics 1
Other
Installation Characteristics 2
Above ground
Installation type
Floor location
Device type
Fixed system
Access Category
General, Supervised, Authorized
Access Category
Max. allowable R290 charge
General
5 Kg
Supervised
10 Kg
Authorized
…..
NO
LIMITS