Watts Lync AEGIS User manual

Installation, Operation and
Maintenance Manual
Lync AEGIS
Disclaimer
The information contained in this manual is subject to change without notice
from Watts Heating and Hot Water Solutions LLC dba Lync by Watts ("Lync").
Lync makes no warranty of any kind with respect to this material, including,
but not limited to, implied warranties of merchantability and fitness for a
particular application. Lync is not liable for errors appearing in this manual, nor
for incidental or consequential damages occurring in connection with the
furnishing, performance, or use of these materials.
Hot Water Solutions
Lync • 425 W Everman Pkway, St. 101 • Fort Worth, TX 76134
USA: T: [phone]
Technical Support • [phone] (ext. 3) • Mon-Fri, 8 am - 5 pm CST
© 2022 LYNC
L-OMM-012_A •4/20/2022

Lync AEGIS
Table of Contents
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CONTENTS
1. SAFETY CONSIDERATIONS ..............................................................................................................4
1.1. General Warnings......................................................................................................................5
1.2. Safety Precautions....................................................................................................................5
2. INTRODUCTION................................................................................................................................... 6
2.1. Aegis Models.............................................................................................................................6
2.2. Unit Control ..............................................................................................................................6
2.3. Sequence Of Operation .............................................................................................................7
2.4. Version With Cool Recovery (Air Source Unit Only) .................................................................8
2.5. Domestic Hot Pump Management.............................................................................................9
2.6. Superheat Set Limit ...................................................................................................................9
2.7. High Inlet Temperature (Hit) Function.....................................................................................10
2.8. HighPressureSetPointCalculation.........................................................................................10
2.9. Anti-Legionella.........................................................................................................................10
2.1.1. Phase 1................................................................................................................................11
2.1.2. Phase 2................................................................................................................................11
3. INSTALLATION..................................................................................................................................13
3.1. Spaces For Installation............................................................................................................14
3.2. Anti-Vibration Mounts ..............................................................................................................14
3.2.1. Rubber Anti-Vibration Mounts ...........................................................................................14
3.3. General Recommendations For Hydraulic Connections.........................................................15
3.3.1. Recommended Hydraulic Circuit ........................................................................................16
3.3.2. Key Considerations For Water Piping .................................................................................16
3.4. Lifting And Transport ...............................................................................................................17
3.5. Removing Transportation Braces............................................................................................17
3.6. Lifting And Transport (Aegis A Air To Water Units).................................................................18
4. HYDRAULIC CONNECTION..............................................................................................................20
4.1. Hydraulic Connection To The Exchanger................................................................................20
4.2. Minimum Source Water Content In The Plant.........................................................................20
4.3. Water Composition .....................................................................................................................21
4.4. Discharge of Safety Valves .....................................................................................................21
4.5. Condensate Disposal ..............................................................................................................22
5. ELECTRIC CONNECTIONS...............................................................................................................23
5.1. Overview..................................................................................................................................23
5.2. Fan Speed Controller ..............................................................................................................23
5.3. Powering The Crankcase Heater ............................................................................................24
5.4. Potential Free Contacts...........................................................................................................24
5.5. Controller Function ..................................................................................................................24
6. STARTUP ...........................................................................................................................................25
6.1. Preliminary Verifications..........................................................................................................25
6.2. Verifications During Operation.................................................................................................25

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7. CALIBRATING CONTROL COMPONENTS......................................................................................26
8. DECOMMISSIONING .........................................................................................................................27
8.1. Seasonal Shutdown.................................................................................................................27
8.2. Emergency Stop......................................................................................................................27
9. PERIODIC MAINTENANCE AND INSPECTIONS .....................................................................................27
9.1. Overview..................................................................................................................................28
9.2. Protection Of The Environment ...................................................................................................28
10. DISPOSAL OF THE UNIT ..................................................................................................................29
11. REFRIGERANT ..................................................................................................................................30
11.1. Refrigerant Safety Data Sheets...............................................................................................30

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1: SAFETY CONSIDERATIONS
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1. SAFETY CONSIDERATIONS
IMPORTANT SAFETY NOTE
It takes only 5 seconds of skin contact with 140°F water to cause a second degree burn!
You must protect against high water temperatures in all lavatories, tubs, showers and
other points of hot water contact.
Accidental scalding from hot water is a greater risk in some types of installations. Some
examples are:
•Homes For The Mentally Handicapped
•Homes For The Physically Handicapped
•Hospitals And Nursing Homes
•Elder Care Facilities And Rest Homes
•Orphanages And Child Care Facilities
•Potable hot water should be tempered to no more than 110°F when used for
bathing or other personal uses in any installation where response to contact with
hot water may be slower or where the danger of hot water contact is greater.
I M P O R T A N T !
Always follow local code requirements and the authorities having jurisdiction.
Thermostatically controlled mixing valves must be used in the design of the potable hot water
system.
Good engineering practice mandates thermostatically controlled mixing valves set at 120°f or
less to keep the delivered water temperature below scalding temperatures.
If the information in this manual is not followed exactly, a fire, explosion or exposure to
hazardous materials may result, causing property damage, personal injury or death.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable liquids near this or any other appliance.
W A R N I N G !
If the information in these instructions is not followed exactly, a fire or explosion may result
causing property damage, personal injury or death. Do not store or use gasoline or other
flammable vapors and liquids in the vicinity of this or any other appliance.
W A R N I N G !
Installation and service must be performed by a qualified installer, or service agency who must
read and follow the supplied instructions before installing, servicing or removing the unit.
Refer to the information in this manual. Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury, exposure to hazardous materials or
death. Do not use matches, candles, flames, or other sources of ignition to check for gas leaks.
Fluids under pressure may cause injury to personnel or damage to equipment when released.
Be sure to shut off all incoming and outgoing water shutoff valves and carefully decrease all
trapped pressures to zero before performing maintenance.
The electrical connection cover must be installed at all times, except during maintenance.
A disconnect switch must be installed at the electrical service connection per local codes.

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1: SAFETY CONSIDERATIONS
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I M P O R T A N T :
This manual contains information required for installation, operation and maintenance of the
Lync AEGIS. Read and follow the information in this and all other provided instructions, labels
and markings before installing, operating or servicing this equipment.
1.1. General Warnings
Read before proceeding any further in the manual.
•This manual is an integral part of the product and must be kept for consultation.
•The controller must not be used with functions other than those described herein.
•Before continuing, check the application limits.
•The company reserves the right to change the composition of its products without
notice.
1.2. Safety Precautions
•Use the controller only within the intended operating limits.
•The electrical panel must not be opened by unauthorized personnel.
•Make sure cables for the probes and the power supply kept separate without twisting.
For applications in especially critical industrial environments, it may be useful to use
network filters.
C A U T I O N !
Disconnect all electrical connections before starting any maintenance work.

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2: INTRODUCTION
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2. INTRODUCTION
Aegis is a highly efficient, commercial heat pump solution that uses electricity and natural
refrigerant-grade CO2 to produce domestic hot water up to 185°F all year round.
Using electricity and the superior qualities of R744, a natural refrigerant-grade CO2, the Aegis
heat pump water heaters are one of the cleanest, most efficient and environmentally friendly ways
to heat domestic water.
2.1. Aegis Models
Aegis comes in two versions: Aegis A and Aegis W. Aegis A absorbs and moves heat from the
surrounding air at temperatures as low as -4°F to produce hot water. Aegis W produces hot water
by absorbing and moving heat from a connected water source at temperatures as low as 14°F.
The model, serial number, power voltage, etc. are shown on labels affixed to the machine.
2.2. Unit Control
The unit control software is responsible for regulating the outlet water temperature from
the appliance. The parameter displayed as " ST01 Set Hot Water" is user adjustable.
Additionally, the unit control manages the circulation of water in orderto ensure that the
correct temperature rise in the system is maintained and will determine the need for hot
water recovery by monitoring the water temperature in the storage tanks.
Please note that the delivery temperature is regulated by modulating the pump, therefore the flow
of hot water at the outlet is not constant.

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2.3. Sequence Of Operation
The hot water storage tanks used in this heating system must be equipped with the two provided
temperature sensors, or other sensors meeting requirements for a NTC 10k temperature sensor.
The BT2 sensor (hot side probe) is located in the top of the last storage tank in the series, near the
supply outlet. The (BT1) sensor (cold side probe) is placed in the bottom of the first storage, near
cold return water connection.
The optional BT3 sensor is locatedon the outlet of the external heat exchanger (see
dedicated section) andis needed tomodulate the inverter circulation pump placed
between the heat exchanger and the storage tanks. Installation of BT1, BT2, and BT3 probes
must be done by the installer prior to operation.
Note that the tanks must necessarily be hydraulically connected in series as shown
below, not in parallel.
Whenthe temperatureprobeBT1reachesthevalue"Set pointunitON", (set point (ST03) minus
differential (ST04) ), the unit will beturned on. The unit will continue toheatthe watertothe
settemperatureas long asthe temperature BT1 remains below the “Set point unit OFF” value
(ST03). Once BT1 reaches "Set point unit OFF" the unit will be turned off.
BT3 probe –secondary side
pump modulation

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2: INTRODUCTION
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To limit the possible discomfort that can be generated by excessive heat dissipation, or
excessive and rapid spillage of water from the top of the tanks, you can use the probe BT2
to operate a "comfort" function. Inthis case, even if the temperature BT1 is higher than the
value of "Set point unit OFF", the unit operate when the BT2 is lower than a value of "Set point
comfort ON".
Operation with only the BT1 probe is allowed, while the use of the BT2 probe requires the presence
of the BT1 probe. The unit will turn off only when both the BT1 and BT2 temperatures are greater
than the related set points.
I M P O R T A N T
The unit will begin to run with only the BT1 probe, regardless of BT2 probe. If the unit
runs based on the BT2 probe, regulation with BT1 probe will also start automatically,
even if the starting parameter (ST02) is OFF.
Please refer to Aegis Electronic Controller Manual (L-OMM-013) for information on enabling
and choosing between local analog and remote digital input.
2.4. Version With Cool Recovery (Air Source Unit Only)
Using the cool recovery option, heat can be drawn from a water stream rather than the ambient air,
thus providing cooling toa water loop. This can beusedtonot only increasethe performance of the
heat pump, but also increase the performance of water loops such as a central chilled water
system. See Aegis Electronic Controller Manual (L-OMM-013) for further details on how to
activate and control this function. NOTE: This option is available only for the Air source unit.
Set Point ON comfort
Set Point OFF comfort

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2: INTRODUCTION
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2.5. Domestic Hot Pump Management
The software also manages the domestic hot water pump. The start, minimum and maximum
speed can be adjusted separately for both pumps. The domestic hot water pump can be active
when the unit is in standby, but this setting is strongly not recommended, to avoid the
destratification of the temperature in the tanks.
Please note that the main unit pump and the domestic hot water
pump operate with coordinated set points in the sense that an
offset (that can be set by the user) is subtracted from the unit set
point ST1 and it is used to regulate the domestic hot water pump
referred to the BT3 probe. It is needed to apply a regulation offset
(it must be negative) to adjust the secondary pump set point to take
in consideration the temperature losses in the plate exchanger.
NOTE: Speed regulation of the secondary side pump is independent from regulation of the internal
pump. Please see Aegis Electronic Controller Manual (L-OMM-013) for details.
2.6. Superheat Set Limit
For inlet watertemperature > 30°C (>86°F) the superheating is managedby 3-way bypass valvein
combinationto specific software improvements. The High Inlet Temperature (HIT) Function
limits the superheat value with the use of the bypass valve, keeping in consideration both
the compressor oil temperature and the compressor discharge temperature.
In order to optimize the cycle efficiency and at the same time avoid too high temperatures to the
compressor, the target superheat value is not constant, but will be adjusted according to the
compressor discharge temperature and compressor oil temperature.
This superheat limit should not be changed by a user except under direction from the
manufacturer or an authorized manufacturer’s representative.

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2: INTRODUCTION
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2.7. High Inlet Temperature (Hit) Function
The HIT function allows the heat pump to operate even with inlet water temperatures above the
standard limits. It is utilized:
•for the anti-Legionella treatment (tank temperature > 60 °C (>140°F), see below)
•when domestic water recirculation is used with low water demand
•when heat pump stops for a long time and the tank thermally stratifies.
2.8. High Pressure Set Point Calculation
The high pressure set point is not fixed, but instead is calculated based on inlet water
temperature, outlet water temperature, and evaporation temperature. The pressure is managed
by the thermostatic valve.
The setpoint value is limited between a minimum and a maximum fixed value. Within these limit
values is also active a compensation curve based on the evaporator temperature that keeps the
compressor within the required operating envelope.
2.9. Anti-Legionella
Legionellosis is an infection caused by aerobic bacteria of the genus Legionella that mainly affects
the respiratory system. The name of the disease derives from the fact that the bacterium was first
identified in 1976 on a group of participants in a gathering of the American Legion in a
Philadelphia hotel, on that occasion 291 people contracted thedisease and 34 of them died.
The proliferation of Legionella depends on the water temperature. As can be seen from the chart
below, the disinfection is feasible through thermal shock.
Figure 1: Legionella Growth Chart
1
The anti-Legionella function consists in bringing the water storage tanks to a high temperature
and subsequently carrying out a recirculation to ensure complete disinfection of the system.
1
Freije, Matthew R. How to Make Plumbing Systems Less Conducive to Legionella and Other Bacteria. HC
Information Resources, 1998. .

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2: INTRODUCTION
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The anti-Legionella function, if enabled via “ALG01 Enable anti-Legionella” is activated based on
a time band (if “ALG02 Enable scheduler” is set) or manually via web interface / BMS (“ALG16
Manual start” and ”ALG17 Manual stop”).
More in detail, the conditions necessary to make the anti-Legionella function activable are:
• HP90 unit active (Unit ON)
• anti-Legionella function enabled (parameter ALG01 set to ON)
•no BTL probe alarm
•no BT1 probe alarm
• absence of expansion # 1 offline alarm
• absence of expansion # 2 offline alarm
The anti-Legionella cycle consists of two phases - it is emphasized that in phase 1 the compressor
is active, and the pump modulates as per standard thermoregulation (on “ALG10 Unit anti-
Legionella set”), while in phase 2 the compressor is inactive, and the pump forced to default
speed (on “ALG11 Unit phase 2 pump set”):
2.1.1. Phase 1
The "Anti-Legionella active" relay contact is closed.
The set point “ALG10 Anti-Legionella unit set” is forced (e.g.176-194°F [80-90 ° C]);
Phase 1 ends when the BT1 probe rises above “ALG08 Phase 1 set BT1” (default = 140°F [60 ° C])
and at the same time the BTL probe reaches at least the “ALG09 Phase 1 set BTL” (default =
131°F [55 ° C]).
2.1.2. Phase 2
1. The "Anti-Legionella active" relay contact remains closed
2. The "Anti-Legionella phase 1 completed" relay contact is closed
3. At the end of phase 1 the compressor switches off while the secondary pump is brought to
a fixed speed “ALG11 Unit phase 2 pump set” until the BTL probe reaches the “ALG09
Phase 2 set BTL” (e.g. 70 ° C). The anti-Legionella cycle is considered concluded when
this condition persists for a period of time “ALG12 Min. time phase 2” (e.g. 1 min).
4. At the end of the cycle, the "Anti-Legionella active" and "Anti-Legionella phase 1
completed" relay contacts are opened.

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NOTE: The maximum time parameter of the anti-Legionella cycle “ALG06 Anti-Legionella max
time” is provided (e.g. 120 min.) after which the unit returns to normal operation.
The Defrost function has priority over the anti-Legionella function.

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3: INSTALLATION
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3. INSTALLATION
The Aegis A is an air source model certified for indoor or outdoor installation. It should be installed
outdoors wherever possible, and with the maximum available space for air intake and
maintenance. A minimum of 9 ft (3 m) of overhead clearance is required to prevent the possible
recirculation of air between intake and exhaust. The Aegis W is intended for indoor installation.
The following must be taken into account when choosing the unit’s place of installation and
making the relative connections:
•size and origin of the hydraulic piping;
•location of the power supply;
•accessibility for maintenance or repair operations;
•solidity of the support surface;
•ventilation of the air-cooled condenser;
•orientation and exposure to solar radiation: keep the condensing coil out of direct sunlight
whenever possible;
•do not position the unit in a way that strong winds favor air recirculation at the condensing
coil;
•do not position the machine on dark colored land (e.g. tarred surfaces) so as not to cause
functioning overheating;
•possible sound reverberation
It is obligatory to observe the clearances specified in the dimensional drawing of the unit. The unit
must always be anchored to the ground.
Provide a solid base on which to position the unit. This support must be flat and horizontal with
dimensions suitable for the unit, especially if the unit is to be positioned on unstable ground.
Figure 2: Structure Of A Typical Support Slab
The slab should be in suitable foundation with a height of about 6-8 inches (15-20 cm) above the
surrounding land and at least 12 inches (30 cm) longer and wider than the machine.
Although the unit transmits low levels of vibrations to the supporting structure, it is recommended
to lay a sheet of hard rubber between the base of the unit and the supporting surface. If better
vibration isolation is required, beyond the included anti-vibration supports, contact a certified
seismic engineer. In the event of installation on roofs or intermediate floors, the unit and the piping
must be isolated from the walls and ceilings.

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The units should not be positioned in proximity of private offices, bedrooms or areas where low
sound emissions are required. To prevent excessive sound reverberation, do not install the unit in
narrow or confined spaces. For noise levels in specific operating conditions, please see the Aegis
Technical Data Sheet or contact your local Lync rep.
The machine equipped with standard coils should not be installed in a corrosive environment.
Particular care should be taken to avoid atmospheres containing sodium chloride, which can
aggravate corrosion due to galvanic currents; a machine with untreated coils must not, for any
reason, be installed in a marine environment unless provided with the optional coil coating for
coastal areas.
In the case of a marine or highly polluting industrial environment, it is necessary to request coils
with anti-corrosion surface treatment.
If there are any questions about applicability for a particular environment, contact your local Lync
representative.
3.1. Spaces For Installation
The service spaces to comply with are shown on dimensional drawings AP-A-1058, -1059, and -
1060, available at lyncbywatts.com.
The evaporating coil must be allowed adequate space for the airflow at both the intake and the
exhaust side.In order to prevent poor unit capacity or even interruptions in unit operation it is
absolutely essential to avoid the recirculation of air between the intake and the exhaust.
High walls near the unit may interfere with its proper functioning.Units should be installed a
minimum of 9 feet (3 meters) apart.
It is advisable to leave sufficient space between the units for removing their larger components
such as the exchangers, compressors or pumps.
3.2. Anti-Vibration Mounts
In order to reduce vibrations transmitted to the structure, it is recommended to install the machine
on rubber or spring anti-vibration mounts, supplied as an accessory.
The dimensional layout attached to the machine shows the position and load of each antivibration
mount. The anti-vibration mounts must be applied before positioning the machine on the ground.
3.2.1. Rubber Anti-Vibration Mounts
The anti-vibration mount consists of an upper metal bell with a screw to fasten the unit base.The
antivibration mount is fastened to the base through the two holes on the flange.The anti-vibration
flange bears a number (45,60,70 Shore A) that identifies the hardness of the rubber support.The
Aegis 250 A has (4) 60° Shore A mounts, the Aegis 350-500 A has (2) 60° and (4) 75° mounts,
and the Aegis W 250-500 have (4) 75° mounts.

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3.3. General Recommendations For Hydraulic Connections
W A R N I N G !
The units may produce hot water at temperatures as high as 194°F (90°C). All hydronic
components must be selected for this temperature.
When setting up the hydraulic circuit for the gas cooler, it is good practice to comply with the
following prescriptions and with the national and local regulations.It is recommended to connect
the piping to the heat pumps using flexible joints in order to prevent transmission of the
vibrations and compensate for thermal expansion.
Install the following components on the piping:
•Stop cocks, temperature and pressure indicators for maintenance and unit inspection.
•Sample points on the input and output pipes to read the temperature, if temperature
indicators are not present.
•Shut-off valves to isolate the unit from the hydraulic circuit.
•Metal mesh filter with openings not wider than 1/16" (1 mm) on the exchanger inlet pipe
to protect the ex- changer against slag or impurities in the pipes.
•Air vents installed at the highest parts of the hydraulic circuit in order to allow excess air
to be released.
•Expansion tank and automatic charging valve for maintenance of the system pressure
and to compensate for thermal expansion.
•Drain valve and where necessary, drain tank to empty the system for maintenance
operations or seasonal breaks.
I M P O R T A N T
It is highly recommended to install a safety relief valve on the hydraulic circuit. If serious
anomalies should arise in the system (e.g. a fire breaks out), this allows the system to be
drained to prevent an explosion. Always connect the drain to a pipe with a diameter no less
than that of the valve opening and direct it towards the areas where the discharge cannot
harm anyone.

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3.3.1. Recommended Hydraulic Circuit
1. Union joint: Be sure to install in to enable the unit to be removed for maintenance or replacement.
2. Thermometer: Be sure to install for capacity check and operation monitoring.
3. Water pressure gauge: Be sure to install it for checking operation status.
4. Valve: Be sure to install for cleaning heat exchanger and/or replacing unit.
5. Flexible joint: Recommended for preventing vibration through system piping.
6. Strainer (60 mesh or more): Install strainer at inlet port to avoid intrusion of foreign matter into the unit.
7. Check valves: Must be installed when installing multiple heat pumps.
8. Air purge valve: install at the highest point in the piping where air may accumulate.
9. Water piping: Water piping work shall be done by a qualified installer.
10. Drain valve: Be sure to install in order to drain off the water from the system at servicing.
Figure 3: Recommended Water Piping
3.3.2. Key Considerations For Water Piping
Water quality: It is important to check in advance whether the feed water and hot water have
good quality.Be sure to use water within the ranges specified in Section 4.3
Foreign matter in water: If solid matter such as sand piping debris, scale deposits, and/or
floating suspended solids such as corrosion product exist in water, the heat- transfer surface of
heat exchanger is directly attacked by water flow, and corrosion may be created locally. In order
to avoid such corrosion by these foreign matters, be sure to fit a cleanable strainer (60 mesh
/0.25mm or smaller) at the water inlet port of the unit to remove foreign matters.
Contact of dissimilar metals: Depending on the type of metal, certain metals when placed in
contact with each other may cause localized corrosion. Special measures should be taken to
limit corrosion, such as the inclusion of non-conductive materials in between metals.
Water piping should have no leaks or air intrusion.If air is introduced at the suction side of
pumps, the pump may create excess noise and performance may decrease.
For installations exposed to freezing temperatures, take precautions to prevent the freezing of
piping. Note: Aegis A has a freeze protection function, Aegis W does not. In either case it is
recommended to include a proper glycol mixture in the primary loop in the case of power loss.
Contact your glycol supplier for further details on freeze protection.

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3.4. Lifting And Transport
While unloading and positioning the unit, take extreme care to avoid sudden, violent
movements.Avoid applying force to components of the machine.The unit may be lifted using
assistance from a forklift, inserting the lifting forks in the lifting pallet (see Figure 4).
Figure 4: Lifting the Unit with Forklift
3.5. Removing Transportation Braces
During transport, the unit may be subjected to strong vibrations. To ensure no damage occurs
as a result, transport braces were fitted prior to transport. When the unit arrives, it is necessary
to remove these from the unit and the pallet.
Figure 5: Transport Brace Locations
I M P O R T A N T
After the unit has been positioned it is necessary to remove the transportation screws
between the wooden pallet and the damping platform. The screws are indicated within the
unit with appropriate labels. The number of braces depends on the size of the unit.

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3: INSTALLATION
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Figure 6: Transport Screw Locations
3.6. Lifting And Transport (Aegis A Air To Water Units)
During unloading and positioning of the unit, great care must be given to prevent sudden or
violent maneuvers and not using machine components as lifting points.
Lift the unit using steel tubes inserted in the relative lifting holes. Use cords or belts that are long
enough and spacer bars so as not to damage the sides and lid of the unit.
Note: Pipes must have passages, pivots, or other fasteners to prevent straps from releasing.
Alternatively, the units can be lifted using a fork-lift truck, inserting the forks in the supporting
pallet. The figure below illustrates typical lifting modes; take a look at the dimensional drawing
for a clear identification of the center of gravity.
W A R N I N G !
Make sure that the unit is fastened well before lifting in order to prevent accidental falls or
overturning.

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3: INSTALLATION
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Figure 7: Typical Lifting Modes
W A R N I N G :
The pictures may appear different than your actual unit. All images in this manual are for
explanation purpose only; all information and reference to lifting applies to all of our models.

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4: HYDRAULIC CONNECTION
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4. HYDRAULIC CONNECTION
4.1. Hydraulic Connection To The Exchanger
I M P O R T A N T
The water inlet must be installed where the connection is marked with the following plate:
I M P O R T A N T
The primary circuit should be set up in such a way as to guarantee a constant flow of water
to the exchanger in all operating conditions. If this is not the case, there is a risk of refrigerant
returning in the liquid state to the compressor input which could damage the compressor.
W A R N I N G !
Do not operate hydraulic connections with open flame near or inside the unit.
I M P O R T A N T
To ensure the correct operation of each pump on the machine:
• Before starting check that the pump shaft rotates freely, without mechanical impediments.
• Do NOT run the pump dry, unprimed and below the minimum nominal water flow rate.
• Do NOT operate the pump with closed shut-off valves, suction side and delivery side.
• It is forbidden to use the pump in case of cavitation.
• It is mandatory to fill and bleed the hydraulic circuit correctly before starting the pump.
4.2. Minimum Source Water Content In The Plant
For water source units or air source with cool recovery, it is important to maintain a minimum
water volume in the source loop to ensure sufficient compressor runtime. The compressors can
run intermittently; this is because the amount of heat power required by the system is not
generally the same as that provided by the machine.
The formula below is for calculating the minimum water content on the source loop. If the actual
pipe volume is less than required, a buffer tank is required.
V
min
≥P
tot
x 50
V
min
: water content of tank [l]
P
tot
: power capacity of the unit [kW]
NOTE: This formula is for the volume of storage for cold source water on W models or A
models equipped with cool recovery option.
Buffer tanks must be properly insulated to prevent condensation and to not have an adverse
effect on system performance.