Accorroni RPE 019 User manual

TECHNICAL MANUALRPE 19÷44 - HPE 18÷40
Chillers and heat pumps
RPE 19÷44 - HPE 18÷40

ORIGINAL INSTRUCTIONS
The water chillers and heat pumps comply with directive 2014/68//EC (PED).

4
1 SERIES
Water chillers and heat pumps of the series MPE are designed
for outdoor installation in both residential and commercial
applications.
The range uses R410A refrigerant, which assures high levels of
performance with relatively low energy consumption and fea-
tures 18 models in the chiller versionand 25 in heat pump veri-
sion, with cooling capacities ranging from 4 to 75 kW.
BEYOND CONVENTIONAL WORKING LIMITS
The nned block heat exchangers have been optimised for
R410A and use 8 mm copper pipes, which permit a better heat
exchange and quiet operation of the fans.
SELF  ADAPTIVE
The electronic control system allows the setpoint to be adjust-
ed automatically according to the outdoor temperature in order
to reduce consumption and broaden the working temperature
range.
The unit can also function in systems with a low water content,
even without the use of a storage reservoir, thanks to the auto-
matic adjustment which limits the number of compressor starts
and thus extends the life of the compressors themselves.
OFF
Tw,in [°C]
t [s]
ON
15,5
15
14,5
14
13,5
13
12,5
12
11,5
ON ON
ON ON ON
OFF
420s
OFF OFF
600s
OFF
SMART DEFROST SYSTEM
The exclusive smart defrost system can correctly identify an im-
pairment of performance in the outdoor exchanger due to the
formation of ice and minimise the process time in relation to
normal operation of the unit.
Time Defrost start time
MAX
Evaporationing Temperature
Variation

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2 CONSTRUCTIVE FEATURES
STRUCTURE
Galvanised sheet steel structure treated with a polyester powder
coating (RAL9002) suitable for outdoor applications, for an at-
tractive look and eective resistance to corrosive agents.
Fastening devices are made of non-oxidizable materials, or car-
bon steel that has undergone surface-passivating treatments.
The compressor compartment is completely sealed and may be
accessed on 3 sides thanks to easy-to-remove panels that greatly
simplify maintenance and/or inspection.
On request acoustic insulation can reduce the unit noise
emissions
CUSTOMISED HYDRAULIC KIT
 High head pump made entirely of stainless steel, already
congured for use with mixtures of water and ethylene gly-
col up to 35% and provided with internal thermal protection.
 Expansion vessel
 Security valve
 Filling cock (included).
 Automatic vent valve.
 Water dierential pressure switch and outlet water tempera-
ture probe with anti-freeze thermostat function.
 Mechanical Y lter supplied as a standard feature on all mod-
els to protect the evaporator (included).
COOLING CIRCUIT
 Scroll compressors in tandem conguration or trio, with op-
tional acoustical insulation Frame 3 e 4). The levels of e-
ciency, reliability and noise of such components are the state
of the art for the scroll compressor. .
 Brazed plate heat exchangers made of stainless steel and op-
timised for use with R410A.
 Finned block condenser with 8 mm copper piping and alu-
minium ns, characterised by ample heat exchange surfaces.
 Dehydrating lter.
 Flow indicator with humidity indicator.
 Thermostatic valve with external equalisation and integrat-
ed MOP function.
 Cycle reversing valve (only MPE H)
 Check valve (MPE H)
 Liquid receiver (MPE H)
 High and low pressure switch
 Water safety valve
 Schrader valves for checks and/or maintenance
 Refrigerant pressure gauges (optional)
FAN DRIVE ASSEMBLY
Electric fan with 6/8-pole external rotor motor directly keyed to
the axial fan, with internal thermal protection on the windings,
complete with safety grille and dedicated supporting structure.
The fan is housed in a special compartment having a prole de-
signed to optimise ventilation.
The use of nned block heat exchangers with 8 mm diameter
pipes reduces pressure drops on the air side, thus signicantly
improving the noise levels of the units.
The condensation control system continuously and automatical-
ly regulates the fan speed, further limiting the noise emissions
of the unit during nighttime operation and under partial load
conditions.
FINNED BLOCK HEAT EXCHANGER
Made of 8 mm diameter copper pipes and aluminium ns, gen-
erously sized.
The special engineering of the heat exchangers allows defrost
cycles to be carried out at maximum speed in the models with
heat pump operation, which brings clear benets in terms of the
integrated eciency of the whole cycle.
ELECTRONIC MICROPROCESSOR CONTROL
The electronic control enables the complete control of the MPE
unit. It can be easily accessed through a polycarbonate ap with
IP65 protection rating.
The self-adaptive logic enables the unit to operate even in
systems where the water content is low, without the use of an
inertial water storage reservoir. By reading the outdoor air tem-
perature, it can automatically change the setpoint to adapt it to
the outdoor load
The basic controller comes complete with the MODBUS protocol
and enablesan immediate connection to GARDA networks.
Main functions:
 Control over the temperature of water entering the evapo-
rator.
 Control over the temperature of water entering the evapo-
rator. (MPE H)
 Control of fan speed (optional)

6
 Complete alarm management.
 Dynamic control of the setpoint according to the outdoor
air temperature.
 Can be connected to an RS485 serial line for supervisory /
teleassistance operation
 Setup for connection to a remote terminal that duplicates
the functions of the electronic control
Devices controlled
 Compressor
 Fans
 Cycle reversing valve (MPE H)
 Water circulation pump
 Antifreeze heating element (optional)
 Alarm signalling relay
On request, it is possible to install the advanced controller whose
functions extend to:
 LAN networks
 Modulation of the pump group, defrost (Smart Defrost Sys-
tem).
ELECTRIC CONTROL BOARD
The electric control board is constructed and wired in accordance
with EEC Directive 73/23, Directive 89/336 on electromagnetic
compatibility and related standards. Made of steel sheet, it is al-
so protected by the enclosing panels of the machine.
OPTIONS
 Incorporable hydraulic kit
 Condensation control
 Low noise execution
 Refrigerant pressure gauges
 Antifreeze heating elements on the water circuit
 Electronic thermostatic valve
 Heat recovery 25% (chiller)
 Special exchangers (hydrophilic treatment, copper-copper,
cataphoresis, anti-corrosion)

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3 CONFIGURATION OPTIONS
The MPE series consists of 18 models in cooling only version and
25 in reversible heat pump version. All models operates with
R410A refrigerant.
» Conguration options
1 Expansion valve
0 Mechanical
A Electronic
2 Water pump and accessories
1 LP pump + expansion vessel
2 LP run and standby double pump + expansion vessel
3 Water buer tank
0 Absent
S Selected
4 Partial heat recovery
0 Absent
D Desuperheater with pump activation contact
5 Air ow modulation
C Condensation control by phase-cut fans
E Condensation control performed by EC fans
6 Antifreezing kit
0 Absent
E Evaporator
P Evaporator and water pump
S Evaporator, water pump and water buer tank
7 Acoustic insulation and attenuation
0 Absent
1 Compressor compartment acoustic insulation
2 Compressor sound blanket
3 Compressor compartment acoustic insulation and sound blanket
8 Refrigerant pipework accessories
0 Absent
M Refrigerant pressure gauges
9 Remote control / Serial communication
0 Absent
2 RS485 serial board (Carel / Modbus protocol)
B BACNET IP / PCOWEB serial board (advanced controller required)
F BACNET MS/TP / PCONET board (advanced control required)
G BACNET IP / PCOWEB serial board + supervision software Gweb (advanced controller required)
L LON FTT10 serial board (advanced controller required)
M Remote simplied user panel for standard controller
S Remote simplied user panel
X Remote simplied user panel for advanced controller
10 Special coils / Protective treatments
0 Standard
B Pre-painted ns with epoxy painting
C Cataphoresis
R Copper-copper
11 Outdoor nned coil heat exchanger protection
0 Absent
G Outdoor nned coil heat exchanger protection grille
12 Compressors options
0 Absent
1 Power factor capacitors
2 Soft starter
3 Power factor capacitors + soft starter
4 Crankcase compressor heater (CHILLER), outdoor coil trace heater (HP)
13 Onboard controller
1 Basic
2 Advanced
3 Advanced + GSM modem board
4 Advanced + clock card

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»HPE 28 - 40
DESCRIPTION
1 R410A-air heat-exchanger
2 R410A-water heat-exchanger
3 Fans
4 Water dierential pressure switch (fan housing)
5 Automatic air purge valve
6 Expansion vessel (fan housing)
7 Buer tank (accessory)
8 -
9 4 Way valve (MPE H)
10 Thermostatic valve
11 Water safety valve
12 Liquid receiver (fan housing)(MPE H)
13 Circulation pump
14 Compressor
15 Refrigerant lter
16 Low pressure switch and charge port
17 High pressure switch and charge port
18 Water gauge
19 Water charge
4 DIMENSIONS

RG66004016-08
È severamente vietata la riproduzione anche parziale di questo documento 9
»RPE HPE 18 - 27
LEGENDA
1 Ingresso acqua 1" 1/4 femmina
2 Uscita acqua 1" 1/4 femmina
3 Scarico valvola di sicurezza con portagomma
4 Alimentazione acqua 1/2" maschio (rubinetto optional)
5 Scarico acqua 1/2" femmina
6 Alimentazione elettrica Ø 28 mm
7 Quadro elettrico
8 Antivibranti
A
605
201
298
186
1565
983
1126
1171.5
1273.5
241.51112207
1588
601
568
127
378
650.5
150.5
1 m
1,5 m
1,5 m
88
12
5
34
6
7

MANUALE DI INSTALLAZIONE, USO E MANUTENZIONE
10
»RPE HPE 28 - 40 ;
LEGENDA
1 Ingresso acqua 1" 1/4 femmina
2 Uscita acqua 1" 1/4 femmina
3 Scarico valvola di sicurezza con portagomma
4 Alimentazione acqua 1/2" maschio (rubinetto optional)
5 Scarico acqua 1/2" femmina
6 Alimentazione elettrica Ø 37 mm
7 Quadro elettrico
8Antivibranti
1012
1108
201
356
951
1965
1987.5
1450.5
138.5
254
682
100
1223
319
139.5
379.5
914
947
303.7303.7 729.8 623.8
1 m
1 m
1,5 m
1,5 m
8
7
88
2
5
3
4
1
6
88
9

RG66004288-09
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5 TECHNICAL FEATURES
5.1 RPE WATER CHILLERS RATED TECHNICAL DATA
»RPE water chillers rated technical data
RPE 019 023 027
Power supply V-ph-Hz 400 - 3 - 50
Cooling capacity (1)(E) kW 19,70 22,50 26,40
Total power input (1)(E) kW 6,61 7,53 9,50
Absorbed rated current (1) A 13,11 14,68 16,67
EER (1)(E) 2,98 2,99 2,78
SEER (2)(E) 3,80 3,80 3,80
Eurovent eciency class (1)(E) B B C
Maximum current absorption A 24 26 32
Star up current A 105 133 133
Startup current with soft starter A 72 110 91
Compressors / circuits 1 / 1
no. of axial fans 4 4 4
Air ow rate (3) m³/h 9990 9307 9307
Water ow (1) l/h 3406 3883 4560
Water pressure drop (1)(E) kPa 51 49 34
Available pressure head - LP pumps (1) kPa 124 94 111
Buer tank volume dm³ 50 50 50
Expansion vessel volume dm³ 5 5 5
Unit connections diameter “ 1 1/4 1 1/4 1 1/4
Height mm 1274 1274 1274
Depth mm 605 605 605
Length mm 1588 1588 1588
Sound power level (4)(E) dB(A) 71 72 72
Sound pressure level (5) dB(A) 43 43 44
Refrigerant charge kg 4,2 5,8 6,0
Transport weight unit with pump and tank kg 281 297 313
Operating weight unit with pump and full tank kg 317 333 350
(1) Outdoor air temperature 35°C, water temperature 12°C / 7°C (EN14511:2013)
(2) I valori di ecienza η in riscaldamento e rareddamento si calcolano rispettivamente con le seguenti formule: [η = SCOP / 2,5 - F(1) - F(2)] e [η = SEER / 2,5 - F(1) - F(2)]. Per maggiori informazioni fare riferimento all’approfondimento tecnico
“DIRETTIVA ErP 2009/125/EC”nelle pagine introduttive del catalogo o alla normativa EN14825:2017.
(3) Outdoor air temperature 35°C, water temperature 12°C / 7°C (14511:2013)
(4) Sound power level measured according to ISO 9614
(5) Sound pressure measured at a distance of 10 m in a free eld with a directivity factor of 2

12
»RPE water chillers rated technical data
RPE 028 032 035 040
Power supply V-ph-Hz 400 - 3 - 50
Cooling capacity (1)(E) kW 27,90 31,20 34,80 39,40
Total power input (1)(E) kW 8,91 10,40 11,70 13,10
Absorbed rated current (1) A 16,36 18,59 20,92 22,94
EER (1)(E) 3,13 3,00 2,97 3,01
SEER (2)(E) 3,99 3,98 3,82 3,87
Eurovent eciency class (1)(E) A B B B
Maximum current absorption A 32 34 38 40
Star up current A 134 166 162 164
Startup current with soft starter A 91 114 111 112
Compressors / circuits 1 / 1 1 / 1 1 / 1 1 / 1
no. of axial fans 2
Air ow rate (3) m³/h 16276 16276 16276 15776
Water ow (1) l/h 4835 5412 6000 6821
Water pressure drop (1)(E) kPa 40 51 41 43
Available pressure head - LP pumps (1) kPa 139 123 126 115
Buer tank volume dm³ 125 125 125 125
Expansion vessel volume dm³ 8 8 8 8
Unit connections diameter “ 1 1/4
Height mm 1451 1451 1451 1451
Depth mm 951 951 951 951
Length mm 1988 1988 1988 1988
Sound power level (4)(E) dB(A) 73 73 73 75
Sound pressure level (5) dB(A) 45 45 45 47
Refrigerant charge kg 7,5 7,5 7,8 10,8
Transport weight unit with pump and tank kg 427 456 487 516
Operating weight unit with pump and full tank kg 534 563 595 624
(1) Outdoor air temperature 35°C, water temperature 12°C / 7°C (EN14511:2013)
(2) I valori di ecienza η in riscaldamento e rareddamento si calcolano rispettivamente con le seguenti formule: [η = SCOP / 2,5 - F(1) - F(2)] e [η = SEER / 2,5 - F(1) - F(2)]. Per maggiori informazioni fare riferimento all’approfondimento tecnico
“DIRETTIVA ErP 2009/125/EC”nelle pagine introduttive del catalogo o alla normativa EN14825:2017.
(3) Outdoor air temperature 35°C, water temperature 12°C / 7°C (14511:2013)
(4) Sound power level measured according to ISO 9614
(5) Sound pressure measured at a distance of 10 m in a free eld with a directivity factor of 2

RG66004288-09
All copying, even partial, of this manual is strictly forbidden 13
»HPE heat pumps rated technical data
HPE 018 020 024 028
Power supply V-ph-Hz 400 - 3 - 50
Cooling capacity (1)(E) kW 16,70 19,00 23,10 27,30
Total power input (1)(E) kW 6,40 7,31 8,19 8,81
Absorbed rated current (1) A 11,87 13,11 14,68 16,36
EER (1)(E) 2,61 2,60 2,82 3,10
SEER (2)(E) 3,17 3,14 3,32 3,71
Heating capacity (3)(E) kW 20,20 23,30 27,50 31,70
Absorbed rated current (3) A 12,31 13,17 14,68 17,10
COP (3)(E) 2.93 3.15 3.27 3.37
Eurovent eciency class (3)(E) C B A A
Total power input (3)(E) kW 6,89 7,40 8,41 9,71
SCOP (2)(E) 3,22 3,22 3,44 3,60
Energy eciency 126,0 126,0 135,0 141,0
Heating energy eciency class (4)(E) A+
Maximum current absorption A 22 24 26 32
Star up current A 76 105 159 134
Startup current with soft starter A 51 72 110 91
Air ow rate (5) m³/h 9990 9990 9307 16276
Water ow (1) l/h 2892 3317 4000 4722
Water pressure drop (1)(E) kPa 49 50 42 31
Available pressure head - LP pumps (1) kPa 130 124 109 139
Air ow rate (6) m³/h 9990 9990 9307 16276
Water ow (3) l/h 3480 3976 4720 5438
Water pressure drop (3) kPa 70 70 62 49
Compressors / circuits 1 / 1
Buer tank volume dm³ 50 50 50 125
Expansion vessel volume dm³ 5 5 5 8
Unit connections diameter “ 1 1/4 1 1/4 1 1/4 1 1/4
Height mm 1274 1274 1274 1451
Depth mm 605 605 605 951
Length mm 1588 1588 1588 1988
Sound power level (7)(E) dB(A) 71 71 72 73
Sound pressure level (8) dB(A) 43 43 44 45
Refrigerant charge kg 3,7 4,2 5,8 7,5
Transport weight unit with pump and tank kg 265 281 297 427
Operating weight unit with pump and full tank kg 301 317 333 534
(1) Outdoor air temperature 35°C, water temperature 12°C / 7°C (EN14511:2013)
(2) I valori di ecienza η in riscaldamento e rareddamento si calcolano rispettivamente con le seguenti formule: [η = SCOP / 2,5 - F(1) - F(2)] e [η = SEER / 2,5 - F(1) - F(2)]. Per maggiori informazioni fare riferimento all’approfondimento tecnico
“DIRETTIVA ErP 2009/125/EC”nelle pagine introduttive del catalogo o alla normativa EN14825:2017.
(3) Outdoor air temperature dry bulb 7°C / wet bulb 6°C, water temperature 40°C / 45°C (EN14511:2013)
(4) Seasonal energy eciency class for LOW TEMPERATURE room heating under AVERAGE climatic conditions [EUROPEAN REGULATION No 811/2013]
(5) Outdoor air temperature 35°C, water temperature 12°C / 7°C (14511:2013)
(6) Outdoor air temperature dry bulb 7°C / wet bulb 6°C, water temperature 40°C / 45°C (14511:2013)
(7) Sound power level measured according to ISO 9614
(8) Sound pressure measured at a distance of 10 m in a free eld with a directivity factor of 2

14
»HPE heat pumps rated technical data
HPE 032 035 040
Power supply V-ph-Hz 400 - 3 - 50
Cooling capacity (1)(E) kW 30,60 34,10 38,60
Total power input (1)(E) kW 10,20 11,60 13,10
Absorbed rated current (1) A 18,59 20,92 22,94
EER (1)(E) 3,00 2,94 2,95
SEER (2)(E) 3,58 3,58 3,66
Heating capacity (3)(E) kW 35,90 39,60 45,60
Absorbed rated current (3) A 19,17 21,01 23,52
COP (3)(E) 3.36 3.31 3.38
Eurovent eciency class (3)(E) A A A
Total power input (3)(E) kW 10,70 11,90 13,50
SCOP (2)(E) 3,64 3,70 3,64
Energy eciency 143,0 146,0 143,0
Heating energy eciency class (4)(E) A+
Maximum current absorption A 34 38 40
Star up current A 166 162 164
Startup current with soft starter A 114 111 112
Air ow rate (5) m³/h 16276 16276 15776
Water ow (1) l/h 5309 5873 6686
Water pressure drop (1)(E) kPa 49 39 42
Available pressure head - LP pumps (1) kPa 120 126 115
Air ow rate (6) m³/h 16276 16276 15776
Water ow (3) l/h 6190 6809 7675
Water pressure drop (3) kPa 64 51 53
Compressors / circuits 1 / 1 1 / 1 1 / 1
Buer tank volume dm³ 125 125 125
Expansion vessel volume dm³ 8 8 8
Unit connections diameter “ 1 1/4 1 1/4 1 1/4
Height mm 1451 1451 1451
Depth mm 951 951 951
Length mm 1988 1988 1988
Sound power level (7)(E) dB(A) 73 73 75
Sound pressure level (8) dB(A) 45 45 47
Refrigerant charge kg 7,5 7,8 10,8
Transport weight unit with pump and tank kg 456 487 516
Operating weight unit with pump and full tank kg 563 595 624
(1) Outdoor air temperature 35°C, water temperature 12°C / 7°C (EN14511:2013)
(2) I valori di ecienza η in riscaldamento e rareddamento si calcolano rispettivamente con le seguenti formule: [η = SCOP / 2,5 - F(1) - F(2)] e [η = SEER / 2,5 - F(1) - F(2)]. Per maggiori informazioni fare riferimento all’approfondimento tecnico
“DIRETTIVA ErP 2009/125/EC”nelle pagine introduttive del catalogo o alla normativa EN14825:2017.
(3) Outdoor air temperature dry bulb 7°C / wet bulb 6°C, water temperature 40°C / 45°C (EN14511:2013)
(4) Seasonal energy eciency class for LOW TEMPERATURE room heating under AVERAGE climatic conditions [EUROPEAN REGULATION No 811/2013]
(5) Outdoor air temperature 35°C, water temperature 12°C / 7°C (14511:2013)
(6) Outdoor air temperature dry bulb 7°C / wet bulb 6°C, water temperature 40°C / 45°C (14511:2013)
(7) Sound power level measured according to ISO 9614
(8) Sound pressure measured at a distance of 10 m in a free eld with a directivity factor of 2
400 - 3 - 50
400 - 3 - 50

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7 CALCULATION FACTORS
7.1 CHANGE IN OPERATING PARAMETERS WITH DT OTHER THAN 5°C
After identifying the unit’s performance in the terms of the desired outlet water temperature, correct the value by multiplying it by
the following corrective coecients.
Dierence between water inlet
temperature and water outlet
temperature
Corrective coecient of cooling/
heating capacity
Correction coecient of
electrical input
Correction coecient of water
ow rate
Correction coecient of pressure
drop
3 0,975 1 1,63 2,64
4 0,990 1 1,24 1,53
5 1,000 1 1,00 1,00
6 1,015 1 0,85 0,72
7 1,030 1 0,74 0,54
8 1,040 1 0,65 0,42
7.2 WATER AND GLYCOL MIXTURE
Based on the minimum outlet water temperature, you can derive the percentage of ethylene glycol and the corrective coecient
using the table below.
Percentage of ethylene glycol (%) 0% 10% 20% 30% 40%
Minimum temperature of water produced (°C) 5 2 -5 -10 -15
Mixture freezing temperature (°C) 0 -4 -14 -18 -24
Capacity correction factor 1 1,00 0,99 0,99 0,98
Water ow rate correction factor 1 1,05 1,09 1,14 1,20
Pressure drop correction factor 1 1,16 1,35 1,58 1,86
IMPORTANT! The use of propylene glycol is not admitted with standard pumps. For further information, contact the manufac-
turer.

16
8 SOUND LEVELS
» Sound levels RPE
RPE 125 Hz (1) 250 Hz (1) 500 Hz (1) 1000 Hz (1) 2000 Hz (1) 4000 Hz (1) 8000 Hz (1) LwA (2)
Sound power
level, low-
noise version
(3)
dB dB dB dB dB dB dB dB(A) dB(A)
019 76,6 70,3 69,7 65,6 58,4 53,4 49,6 71 69
023 77,5 71,1 70,5 66,5 59,2 54,2 50,5 72 70
028 - 032 78,4 72,1 71,5 67,4 60,2 55,2 51,5 73 71
035 78,8 72,4 71,8 67,8 60,5 55,6 51,8 73 71
040 80,4 74,0 73,4 69,4 62,1 57,2 53,4 75 72
1. Sound power level by octave band, not weighted
2. Total sound power level, weighted A
3. Sound power level measured according to ISO 9614
» Sound levels RPE
RPE 125 Hz (1) 250 Hz (1) 500 Hz (1) 1000 Hz (1) 2000 Hz (1) 4000 Hz (1) 8000 Hz (1) LwA (2)
Sound power
level, low-
noise version
(3)
dB dB dB dB dB dB dB dB(A) dB(A)
018 76,8 70,5 69,9 65,8 58,6 53,6 49,8 71 69
020 76,6 70,3 69,7 65,6 58,4 53,4 49,6 71 69
024 77,5 71,1 70,5 66,5 59,2 54,2 50,5 72 70
028 - 032 78,4 72,1 71,5 67,4 60,2 55,2 51,5 73 71
035 78,8 72,4 71,8 67,8 60,5 55,6 51,8 73 71
040 80,4 74,0 73,4 69,4 62,1 57,2 53,4 75 73
1. Sound power level by octave band, not weighted
2. Total sound power level, weighted A
3. Sound power level measured according to ISO 9614

RG66004288-09
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9 OPERATING LIMITS
The graphs below illustrate the operating limits of MPE units (in the case of continuous operation) in relation to the outlet water
temperature and outdoor air temperature.
Operating limits Water chiller Heat pump
MIN MAX MIN MAX
Inlet air temperature (°C) 8 20 22 42
Outlet water temperature (°C) 5 16 25 531
Temperature dierence on the water side (°C) 3838
Outdoor air temperature (°C) 20247 -10 203
1. Value achievable only for outdoor air temperatures above 0 ° C.
2. Condensation control: T external air min -10 °C.
3. Evaporation control. outdoor air temperature max 35°C
WARNING The units are designed to work with water and air temperatures falling within the range dened by the operating
limits. Attempting to operate the units beyond these limits could cause irreparable damage to the units themselves.

18
9.1 OPERATING LIMITS IN CHILLER MODE
» Operating limits in chiller mode
Tbs1 Outdoor temperature (dry bulb)
Tw2 Outlet water temperature
OPZ 1 Condensing control
OPZ 2 Glycol + low temperature option
OPZ 1+2 Condensation control + glycol + low temperature option
EEV Electronic expansion valve
STD Standard
opz 1+2
EEV
opz 1+2
EEV
opz 2
opz 1
STD EEV
opz 1 + EEV
opz 1+2
50
45
40
35
30
25
20
15
10
5
0
-5
-10
-15
-6 -4 -2 0 2 4 6 8 10 12 14 16 18 19 20 21
Tw2
Tbs1

RG66004288-09
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9.2 OPERATING LIMITS IN HEAT PUMP MODE
» Operating limits in heat pump mode
RH Relative humidity of outdoor air
Tbs1 Outdoor temperature (dry bulb)
Tw2 Outlet water temperature
Operating range calculated with temperature dierence of 5°C on the water side.
EEV+CC
F08=10
F09=2
F03=20
EEV
GAIN 5
int time 100
55
50
45
40
35
30
25
20
-15 -10 -5 0 5 10 15 20 25 30 35 40
Ta (°C)
Tw2
Extended operating envelope in heat pump mode
Heat pump operation within the right area of the extended operating envelope (beyond standard limits) can be allowed only for
units equipped with condensation control (or EC fans) and electronic expansion valve
Parameters F08-F093-F03 refer to standard microprocessor controller
Parameters GAIN and INT TIME are regulation parameters; they have to be modied inside the electronic expansion valve driver. Both
modications should only made in the factory or implemented on the eld, but only by Galletti S.p.A. authorized personnel.
9.3 THERMAL CARRYING FLUID
The units belonging to the MPEseries can work with mixtures of water and up to 35% ethylene glycol.

RG66004288-09
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»MPE T76
10.2 Y FILTER PRESSURE DROPS
The table below shows the pressure drops of the Y lter (p) as a function of the water ow rate (Qw), assuming an average water
temperature of 10 °C,
» MPE H 004 - 008

RG66004288-09
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12 WATER CIRCUIT
When setting up the water circuit of the unit, it is advisable to follow the directions below and in any case comply with local or na-
tional regulations.
Connect the pipes to the chiller using exible couplings to prevent the transmission of vibrations and to compensate thermal
expansions.
Install the following components on the piping:
 Temperature and pressure indicators for routine maintenance and monitoring of the unit. Pressure control on the water side
allows to assess the correct functioning of the expansion tank and to detect water leakage in advance.
 Traps on incoming and outgoing pipes for temperature measurements, which can provide a direct reading of the operating
temperatures.
 Regulating valves (gate valves) for isolating the unit from the water circuit.
 Metal mesh lter (supplied), with a mesh size no greater than 1 mm, to be tted on the inlet pipe to protect the exchanger
from scale or impurities present in the pipes.
 Air vent valves, to be placed at the highest points of the water circuit for the purpose of bleeding air. (The internal pipes of the
unit are tted with small air vent valves for bleeding the unit itself: this operation may only be carried out when the unit is dis-
connected from the power supply).
 Drainage valve and, where necessary, a drainage tank for emptying out the equipment for maintenance purposes or when the
unit is taken out of service at the end of the season. (A 1”drainage valve is provided on the optional water buer tank: this oper-
ation may only be carried out when the unit is disconnected from the power supply).
It is of fundamental importance that the incoming water supply is hooked up to the connection marked “Water Inlet”.
Otherwise the evaporator would be exposed to the risk of freezing since the antifreeze thermostat would not be able to perform its
function; moreover the reverse cycle would not be respected in the cooling mode, resulting in additional risks of malfunctioning.
The dimensions and position of plumbing connections are shown in the dimension tables at the end of the manual.
The water circuit must be set up in such a way as to guarantee that the nominal ow rate of the water supplied to the evaporator
remains constant (+/- 15%) in all operating conditions.
A standard feature of MPE units is a device for controlling the ow rate (ow switch or dierential pressure switch) in the water circuit
in the immediate vicinity of the evaporator.
12.1 WATER CONTENT AND CHARGING OF EXPANZION TANK SYSTEM
In models without a water storage reservoir it is necessary to assure that the content of water within the system does not fall below
3.5 litres/kW in the case of cooling-only models and 4.5 litres/kW in the case of heat pump models. This level is necessary to prevent
the water temperature from falling below the indoor unit enabling threshold during defrost cycles.
N.B. kW in reference to rated capacity
The expansion tank is pre-charged to a pressure of 1.5 bars, sucient for systems with a maximum height dierence (H in the gure
at the side) of 13 metres.
For greater height dierences, refer to the table below in order to adjust the charging pressure of the expansion tank accordingly.
In no case should you exceed the maximum height dierence Hmax = 35 m.