Transcript
Engineering Data Manual
PAC HT High Temperature Air-to-Water Heat Pumps
Models 12-6, 14-7 & 18-9
12.0 to 17.9 kW
AN AIRWELL GROUP COMPANY
Installation examples Single zone system installation (radiators)
PAC HT
Radiator system ambience thermostat
Domestic hot water (DHW) tank
Insulated underground hot water pipes
Dual zone system installation (radiators and under-floor heating)
PAC HT Radiator system room thermostat Low temperature zone room thermostat (underfloor heating)
Domestic hot water (DHW) tank
Insulated underground hot water pipes
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General Characteristics Introduction This new range of PAC HT air/water high temperature heat pumps offers the special feature of producing hot water at 65 °C at outdoor temperatures down to -20 °C, while guaranteeing a high COP.
Air exchanger Treated with a hydrophilic coating to assist condensed water drainage. The exchanger is sized to avoid clogging, maintain its performance in sub-
For outdoor temperatures above +7° C, the PAC HT supplies water at 55 °C with a single compressor.
zero temperatures and cut the time and frequency of de-icing operations.
Consequently, this PAC HT unit is ideally suited to replace a traditional hot water boiler in producing Domestic Hot Water (DHW).
Fans
The patented technology uses two-stage compressors that provide :
Reinforced polypropylene, low-speed helicoidal fans with optimised fan blade
➜ Higher COP :
In fact, in a two-stage system, each compressor operates at a low compression ratio, i.e. 3:1 compared with 12:1 for single-stage compressor systems. This improves the compressors' service life and reduces electricity consumption.
➜ Same heating capacity maintained even with low outdoor temperatures :
As compressor efficiency is maintained, PAC HT performance is hardly affected, even at low outdoor temperatures.
➜ Remarkable adaptability in terms of matching supplied capacity to heating requirements thanks to the possibility of using each compressor stage separately :
The PAC HT controller chooses the optimum compressor staging configuration according to the demand for heating and the heat emitters' operating temperatures.
profiles to ensure efficient air flow at an extremely low sound level. Fully-enclosed motor, maintenance-free bearings, automatic reset overheating protection device. The fan blades are shielded by plastic grilles for personal protection in accordance with health & safety standards.
Refrigerating circuit The patented refrigerating circuit enables each compressor to be used independently or in two-stage mode. The circuit, factory-filled and tested, includes a filter-dryer, two thermostatic expansion valves, high and low pressure safety devices and all the equipment specific to two-stage technology.
Electrical box
➜ Optimised Domestic Hot Water production :
The electrical box contains all the components for PAC HT operation and
notably the system's protection devices : compressor protection circuit
Both for producing DHW and Heating, the controller determines the compressor staging best suited to the DHW tank coil's heat exchange capacity, while taking account of the outdoor temperature. At the end of the heating phase, the DHW temperature is very close to the condensing temperature without an unnecessary energy consumption.
breaker or fuse, protection fuse, standard start-up current limiter for singlephase units, phase sequence controller for three-phase units. The microprocessor based controller integrated in the box controls all the
Scope of application
PAC HT's functions with the help of a room terminal and temperature sensors.
The PAC HT is mainly designed as a replacement for the boiler without altering the rest of the installation.
Safety functions controlled by the controller :
Bodywork and structure
High and low pressure safety, lack of water flow, lack of refrigerant
Steel bodywork coated with oven-baked epoxy paint coating. The unit base is equipped with large openings under the coil for condensate or de-icing water drainage. Removable panels on all sides allow access to the electrical box and to the refrigeration and hydraulic circuits. Closed bodywork protection index : IP 24.
Compressors Maintenance-free Scroll type compressors produce a high efficiency with low sound levels. The two-stage circuit equipped with 2 compressors with an unrivalled capacity ensures the best possible matching of supplied capacity to heating requirements. Anti-vibration pads under the compressor prevent the transmission of any vibrations to the bodywork.
Water side exchangers Brazed plate construction operating on a counter flow configuration in Winter mode to ensure excellent heating performance.
charge, low evaporation pressure, high and low outlet water temperature limits, winter frost protection, compressor short cycling protection. Diagnosis of failures with history of 150 latest alarms (code, description, occurrence time and sensor values at the time of alarm). Other functions managed by the controller : Water temperature control (inlet and outlet) depending on outdoor temperature and ambient temperature (water law). Choice of compressors for optimised efficiency. De-icing the outdoor exchanger in winter. DHW production management. 2-stage extra electric heating management. Management of boiler relief without additional kit (not compatible with extra electric heating).
3
General Characteristics (continued) Standard equipment
Options and accessories
The PAC HT is supplied with the following standard equipment :
Accessories available for fitting on site :
Electrical box including electrical safety devices, circuit breakers, fuses.
Vibration absorbent pads.
Electronic controller and its keypad screen.
Water valves with pressure tapping.
Communicating room terminal.
Set of hoses – Length 1m, Ø 1 inch.
Main disconnect switch.
3-way directional valve to be used with domestic hot water tank and/or boiler relief.
Start-up current limiter (depending on models). Phase sequence controller (three phase models). Refrigeration circuit with its safety devices. Hydraulic kit comprising : 3 speed circulation pump, flow controller, automatic bleed, drain, pressure gauge, safety valve (3.5 bars).
300 litres water tank for Domestic Hot Water production and 2.5 kW fitted and wired electric heating resistance. 230 V single phase or 400 V three phase. DHW production management and Legionnaires' disease protection controlled entirely by the PAC HT's standard controller.
Exchanger protection grille.
Additional electric heating, independent of the heat pump, to be fitted in the circuit. Capacity : 6 kW, 2 stages : 2 kW + 4 kW. This option is available for new installations or boiler replacement only.
Water filter.
Filter (sludge trap)
1 filter stop valve.
Buffer/Mixing tank, 140 litres.
4 pads for sound insulation under the casing.
Control The water law parameters are programmed in the controller at the factory. It is possible to adapt them more precisely to the specific features of the home when the PAC HT is being installed : Base outdoor temperature at the site of the home.
Freezing protection mode. Unit fault display in the form of error codes. All the parameters needed to manage DHW production are accessible on the
Home heat losses compared against the base temperature for an ambient temperature of 20° C.
control display located inside the machine. Several DHW production modes
Inlet water temperature for the corresponding heat emitters.
Comfort mode : Priority given to DHW production without any time or
The indoor terminal controls the ambient temperature. The water law can be altered depending on the desired comfort temperature and the variance between that and the actual measured temperature. Functions accessible via the indoor terminal: Clock settings (times and day). Ambient temperature set point. Unoccupied period management. Comfort / forced economy modes.
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are available :
electricity tariff constraints. Economy mode : DHW is only produced during off-peak periods or in accordance with times programmed in the controller. Immediate running : The machine keypad can be used to force DHW production. At the end of the cycle the system reverts automatically to normal running. The Legionnaires' disease protection function is included in the standard control system.
COND
ECO
Operating Diagram - Two-stage Cycle with Economiser and Partial Injection
Injection expansion valve
7 5
Main expansion valve
3 4 8
High pressure
6 2 Low pressure
Medium pressure
9
1
HP
LP
C2
C1
COND : Condenser ECO : Economiser LP : Low pressure HP : High pressure
Operating cycle The PAC HT operates on a two-stage compression cycle.
Compressor operation The action on the two 4-way cycle inversion valves V1 and V2 creates the
It uses two compressors :
following operating modes :
- the larger (C1) for the Low Pressure (LP) stage.
- C2 (HP) compressor on its own.
- the smaller (C2) for the High Pressure (HP) stage. The economiser (refer to above diagram) located at the condenser outlet, receives some of the HP liquid (point 4) which, after expansion (point 7), cools the main liquid circuit and generates cooled gas that is mixed with the gas coming from the LP compressor (point 8). This economiser has two functions : - Sub-cooling the liquid to increase the evaporator's and therefore the heat pump performance, both in heating mode and in domestic hot water production mode. - Generating cooled gas to cool the HP compressor suction side. When the LP or the HP compressor operates on its own, its cycle is identical to that of a traditional single compressor cycle.
- C1 (LP) compressor on its own, - C1 and C2 compressors together. - De-icing with the C1 compressor on its own. When heating needs are low and the water outlet temperature required is below 55 °C, the small compressor C2 operates on its own. The machine runs in normal mode but at a reduced capacity within an outdoor temperature range of +20 °C to 0 °C by producing hot water at temperatures between +35 °C and +55 °C. Within these same operating limits (outdoor temperatures and hot water temperatures), the larger compressor C1 operates instead of the smaller one when the heating needs are greater. When the outdoor conditions are between +7 °C and -20 °C, the heat pump switches to high capacity mode with both compressors operating in series to produce hot water at temperatures between +50 °C and +65 °C.
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General Hydraulic Layout for a Type 1 (*) Installation
HW
1
8
3 7
1 1
1 1 CW
6
14
1
13
5 1
15
1
1
2
3 1
1
12
1
Stop valve
12
Expansion tank
2
Buffer tank (optional)
13
In-line heater
3
Filter or sludge trap
14
Bleed
5
3-way valve - Domestic hot water
15
6
Domestic hot water tank
7
Safety devices
8
Recycling circulating pump (optional)
Safety valve HW : Hot Water CW : Cold Water
*
Installation components not supplied
Layout 1 : This layout is recommended when the PAC HT water flow is continuous and close to the nominal value (no radiator thermostatic valves). The buffer tank (2) provides extra circulating water volume to maintain the minimum volume.
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General Hydraulic Layout for a Type 2 (*) Installation
HW
1
8
3 7
1 1
1
14
1
6
CW 15
13 1
9 4 1
1
5 1
11
2
3 1
1
12
1
Stop valve
11
Flow regulating valve
2
Buffer tank (optional)
12
Expansion tank
3
Filter or sludge trap
13
In-line heater
4
Relief valve
14
Bleed
5
3-way valve - Domestic hot water
15
Safety valve
6
Domestic hot water tank
HW : Hot Water
7
Safety devices
CW : Cold Water
8
Recycling circulating pump (optional)
9
Circulation pump
*
Installation components not supplied
Layout 2 : This layout is recommended for heating installations with wide operating water flow variations (radiator thermostatic valves present in the system). We strongly recommend including the buffer tank (2) as it guarantees that the heating loop capacity is higher than the minimum volume when the maximum number of thermostatic valves are closed. The flow adjustment valve (11) is used to balance the flow in heating mode and domestic hot water mode to always ensure optimum PAC HT operation.
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General Hydraulic Layout for a Type 3 (*) Installation
HW
1
8
3 7
1
1
1
14
1
6
CW
9
15
13
1
1 4
1
5
1
1
10
11
1 3 1
1
12
1
Stop valve
11
Flow regulating valve
3
Filter or sludge trap
12
Expansion tank
4
Relief valve
13
In-line heater
5
3-way valve - Domestic hot water
14
Bleed
6
Domestic hot water tank
15
Safety valve
7
Safety devices
HW : Hot Water
8
Recycling circulating pump (optional)
CW : Cold Water
9
Circulation pump
10
Mixing tank
*
Installation components not supplied
Layout 3 : This layout is also recommended for heating installations with wide operating water flow variations (radiator thermostatic valves present in the system). Minimum system volume is guaranteed by a mixing tank (10). Take care when calculating the volume of water in the installation and only take account of 50% of the mixing tank's volume. Example : For a useful volume of 100 litres the actual mixing tank volume will be 200 litres. The flow adjustment valve (11) is used to balance the flow in heating mode and domestic hot water mode to always ensure optimum PAC HT operation.
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Operating Limits 70 65 60
Leaving water temperature setpoint (°C)
55 50
TWO STAGE
45 40
SINGLE STAGE
35 30
Two stage – min. entering water T.
25
Two stage – max. leaving water T.
20
Single stage – max. leaving water T. 15
10 -25
-20
-15
-10
-5
0
5
10
15
20
25
Outdoor temperature (°C)
Physical Data pac ht models
12-6
14-7
18-9
refrigerant Type
R407C
compressors Type
2 Scroll compressors
hydraulic connections Water inlet
inch
1" Female
Water outlet
inch
1" Female
sound levels Sound pressure levels at 5 m in free field
dBA
42
42
42
Sound power levels
dBA
67
67
67
Length
mm
1150
1150
1150
Depth
mm
401
401
401
Height
mm
1309
1309
1309
Weight
kg
195
201
208
12-6
14-7
18-9
3x6
3x6
-
32
32
-
5 x 2.5
5 x 2.5
5 x 2.5
16
16
16
dimensions and weight
Electrical Data PAC HT MODELS supply voltage 1~230 V Electrical supply cable General protection fuse rating
mm2 A
supply voltage 3n~400 V Electrical supply cable General protection fuse rating
mm2 A
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Performance Data PAC HT models
12-6
14-7
18-9
Water condition 30/35 °C Heating capacity single-compressor
kW
6.5
7.9
8.9
Power input
kW
1.7
2.0
2.2
3.84
4.00
4.12
COP Water condition 40/45 °C Outdoor air condition +7 °C / +6 °C WB
Heating capacity single-compressor
kW
6.2
7.5
8.4
Power input
kW
2.0
2.3
2.5
3.14
3.23
3.36
COP Water condition 40/50 °C Heating capacity dual-compressor
kW
12.0
14.3
17.9
Power input
kW
4.4
4.9
6.1
2.73
2.90
2.93
10.4
12.4
15.4
COP Water condition 50 °C Outdoor air condition +2 °C / +1 °C WB
Heating capacity dual-compressor
kW
Power input
kW
COP with defrost
4.4
4.9
6.1
2.37
2.50
2.52
10.0
12.0
14.8
Water condition 65 °C Outdoor air condition 0 °C / -1 °C WB
Heating capacity dual-compressor
kW
Power input
kW
COP with defrost
5.1
6.0
7.3
1.96
2.00
2.03
8.9
10.7
13.1
Water condition 65 °C Outdoor air condition -7 °C / -8 °C WB
Heating capacity dual-compressor
kW
Power input
kW
COP with defrost
4.7
5.6
6.6
1.87
1.91
1.98
Water condition 65 °C Outdoor air condition -15 °C
Heating capacity dual-compressor
kW
7.3
9.3
11.4
Power input
kW
4.2
5.3
6.0
1.75
1.76
1.88
COP with defrost Water condition 65 °C Outdoor air condition -20 °C
Heating capacity dual-compressor
kW
6.3
8.5
10.5
Power input
kW
3.8
5.0
5.7
1.66
1.70
1.85
COP with defrost WB : Wet bulb.
pac ht models Nominal water flow Available hydraulic pressure - High speed
12-6
14-7
18-9
m3/h
1.03
1.23
1.48
kPa
52
50
48
Operating limits (outdoor temperature)
°C
-20 °C
Outlet water temperature Min. / Max.
°C
25 °C / 65 °C
10
Performance Curves - PAC HT 12-6
14 T out=50°C T out=55°C T out=60°C T out=65°C
12 2-stage operating mode
Heating capacity and power input [kW]
10 T out=35°C T out=45°C T out=50°C T out=55°C T out=60°C
Small compressor operating mode 8
6
T out=65°C T out=60°C T out=55°C T out=50°C
4
T out=60°C T out=55°C T out=50°C T out=45°C T out=35°C
2
0 -20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
2
4
6
8
10
12
14
16
18
20
Outdoor air temperature [°C]
T out=35°C
5 Small compressor operating mode 4.5
T out=45°C 4 T out=50°C 3,5 T out=55°C
COP
3
2-stage operating mode
T out=60°C T out=65°C
2.5 2 1.5 1 0,5 0 -20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
2
4
6
8
10
12
14
16
18
20
Outdoor air temperature [°C]
11
Performance Curves - PAC HT 14-7
16 T out=50°C T out=55°C T out=60°C T out=65°C
14 2 stage operating mode
Heating capacity and power input [kW]
12
T out=35°C T out=45°C T out=50°C T out=55°C T out=60°C
Small compressor operating mode
10
8 T out=65°C T out=60°C T out=55°C T out=50°C
6
4
T out=60°C T out=55°C T out=50°C T out=45°C T out=35°C
2
0 -20
-18
-16
-14
-12
-10
-8
-6
-4 -2 0 2 4 Outdoor air temperature [°C]
6
8
10
12
14
16
18
20
5
T out=35°C Small compressor operating mode
4.5
T out=45°C 4 T out=50°C 3.5
T out=55°C
COP
3
T out=60°C
2-stage operating mode
T out=65°C
2.5 2 1.5 1 0.5 0 -20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
2
Outdoor air temperature [°C]
12
4
6
8
10
12
14
16
18
20
Performance Curves - PAC HT 18-9
20 T out=50°C T out=55°C T out=60°C T out=65°C
18 2-stage operating mode
16
Heating capacity and power input [kW]
14 12
T out=35°C T out=45°C T out=50°C T out=55°C T out=60°C
Small compressor operating mode
10
T out=65°C T out=60°C T out=55°C T out=50°C
8 6
T out=60°C T out=55°C T out=50°C T out=45°C T out=35°C
4 2 0 -20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
2
4
6
8
10
12
14
16
18
20
Outdoor air temperature [°C]
T out=35°C
5 Small compressor operating mode
4.5
T out=45°C 4
T out=50°C
3.5
T out=55°C
3
T out=60°C
2-stage operating mode
COP
T out=65°C 2.5 2 1.5 1 0.5 0 -20
-18
-16
-14
-12
-10
-8
-6
-4 -2 0 2 4 Outdoor air temperature [°C]
6
8
10
12
14
16
18
20
13
Pressure Drop Curves Domestic hot water tank (optional)
Pressure drop (kPa)
2.5 2 1.5 1 0.5 0 800
900
1000
1100
1200
1300
1400
1500
1600
1700
Water flow (l/h)
Domestic hot water tank 3-way valve (optional) 0.45 0.40
Pressure drop (kPa)
0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 800
900
1000
1100
1200
1300
Water flow (l/h)
14
1400
1500
1600
1700
1800
1800
Circulation Pump Available Pressure/Water Flow Curves PAC HT 12-6 70 Nominal flow
Min. flow
Max. flow
Available pressure [kPa]
60 50 HS (3)
40 30 20
MS (2) 10 LS (1) 0 700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
Water flow [l/h]
PAC HT 14-7 70 Nominal flow
Min. flow
Max. flow
60
Available pressure [kPa]
50
HS (3)
40 30 MS (2)
20 10 LS (1)
0 700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
Water flow [l/h]
15
Circulation Pump Available Pressure/Water Flow Curves (continued) PAC HT 18-9 70 Nominal flow
Min. flow
Max. flow
60
Available pressure [kPa]
50
HS (3)
40 30 MS (2) 20 10 LS (1)
0 700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
Water flow [l/h]
Circulation Pump Power Input PAC HT - All sizes 150 140
HS (3)
130
MS (2)
120
Power input [W]
110 100
LS (1)
90 80 70 60 50 700
800
900
1000
1100
1200 Water flow [l/h]
16
1300
1400
1500
1600
1700
Dimensions PAC HT E
F
G
C
85
B
1308.50
H 141
J A
703
I
10
K
349
400.50
1150
1192.60 1236.60
A B C E F G H I J K
Electrical power supply Inlet water 1" gas female Outlet water 1" gas female Display Main switch Water pressure gauge High pressure tap Low pressure tap Remote control Anti-vibrations mounts
17
Minimum Clearances Unit
800 500
400
800 500
100
Domestic hot water tank (optional)
140 litre buffer tank (optional)
500 200
200 200
Water inlet
150
Water inlet
700
18
200
150
Notes
19
AIRWELL Italia Srl Via XXV Aprile 29 20030 Barlassina (MI) Italy Tel. +39 0362 525 51 Fax +39 0362 525 690 www.airwell.it
Airwell Group
www.airwell.com
AN AIRWELL GROUP COMPANY
Airwell Group (Headquarter) 1bis, Avenue du 8 mai 1945 Saint Quentin en Yvelines 78284 GUYANCOURT France
AIRWELL Deutschland GmbH Berner Str. 43 D-60437 Frankfurt Germany Tel. +49 (0) 69 50 70 21 20 Fax +49 (0) 69 50 70 22 50 www.airwell.de
As part of our ongoing product improvement programme, our products are subject to change without prior notice. Non contractual photos.
Ref. : EDM PACHT-A.2GB/02.11 - Supersedes : EDM PACHT-A.1GB/11.08 AIRWELL France SAS 1bis, Avenue du 8 mai 1945 Saint Quentin en Yvelines 78284 Guyancourt Cedex France Tel. +33 (0) 01 39 44 78 00 Fax +33 (0) 01 39 44 65 17 www.airwell.fr
AIRWELL Ibérica S.A. Avenida Castilla, 50 28830 San Fernando de Henares (Madrid) Spain Tel. +34 91 710 04 60 Fax +34 91 710 91 96 www.airwell-iberica.es
