null  User manual
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
2
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.
4
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.
5
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.
6
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.
7
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.
8
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
9
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
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