Dimplex AWP 300 LW Installation And Operating Manual
451901.67.19 FD8405
Installation and Operating Manual
Heat Pump Water Heater
with Sheet-Metal Cabinet, Airduct Connection
and Supplementary Heat Exchanger
AWP 300 LW
Page 2 of 20
TABLE OF CONTENTS..........................................................................................................................Page
1. Regulations / Safety Notices..................................................................................................... 3
2. Description.................................................................................................................................. 3
2.1 Refrigeration Cycle.......................................................................................................................4
2.2 Water Circuit................................................................................................................................. 4
2.3 Safety Devices ............................................................................................................................. 5
3. Controlling and Operating Concept..........................................................................................5
3.1 Operating Panel of HPWH .................................................................................................... ....... 5
3.2 Hot Water Temperature Controller............................................................................................... 6
3.3 'Heat Pump' Switch ...................................................................................................................... 6
3.4 'Immersion Heater' Switch............................................................................................................6
3.5 'Heat Exchanger' Switch............................................................................................................... 7
4. Storage / Transport ....................................................................................................................7
4.1 Storage and Transport of HPHW .................................................................................................7
4.1.1 Transport Using a Forklift............................................................................................................. 7
4.1.2 Manual Transport.........................................................................................................................7
5. Installation .................................................................................................................................. 8
5.1 Installation Site............................................................................................................................. 8
5.2 Installation....................................................................................................................................8
6. Mounting.....................................................................................................................................9
6.1 Connection of Water Piping.......................................................................................................... 9
6.2 Connection of Condensate Line................................................................................................... 9
6.3 Electrical Connection.................................................................................................................... 9
6.3.1 Opening the Cabinet .................................................................................................................. 10
7. Commissioning ........................................................................................................................ 10
7.1 Hot Water Circuit........................................................................................................................ 10
7.1.1 Hot Water Circuit Requirements................................................................................................. 10
7.1.2 Commissioning of Hot Water System......................................................................................... 11
8. Maintenance/ Service...............................................................................................................11
8.1 Water Circuit / Condensate Drain............................................................................................... 11
8.2 Air Supply................................................................................................................................... 11
8.3 Sacrificial Anode......................................................................................................................... 12
9. Malfunctions / Troubleshooting.............................................................................................. 12
10. Decommissioning .................................................................................................................... 13
11. Environmental Requirements ................................................................................................. 13
12. Appendix................................................................................................................................... 13
12.1
Refrigeration Cycle with Legend
................................................................................................13
12.2.1
Hydraulic Plumbing Diagram
......................................................................................................14
12.2.2 Heat Exchanger Plumbing Diagram (Ex.: Thermal Solar System)............................................. 14
12.3 Circuit Diagram........................................................................................................................... 15
12.4 Technical Data ........................................................................................................................... 16
Warranty Certificate........................................................................................................................
EC Declaration of Conformity.........................................................................................................
(
HPWH = abbreviation used in the following for Heat Pump Water Heater
)
Page 3 of 20
1. Regulations / Safety Notices
(
This installation and operating manual must be read before the unit is started up!
)
¾¾¾¾#
##
#The heat pump water heater (HPWH) is designed exclusively for the heating of domestic or potable wa-
ter within the specified operating temperature limits!
¾
¾¾
¾ In the design and construction of the HPWH, all relevant EC directives were complied with (see also EC
Declaration of Conformity).
¾
¾¾
¾ A qualified, experienced technician must ensure that prior to the commencement of any mainte-
nance/repair activities on refrigerant-carrying parts, the refrigerant has been removed to such an extent
as necessary for the safe performance of this work. The refrigerant must be handled and disposed of in
accordance with applicable regulations and must not be released into the atmosphere! (Refrigerant
R134a is CFC-free, non-flammable and has no ozone-depleting properties).
¾
¾¾
¾ When working on the HPWH, the unit must always be disconnected from the power source (pull the plug).
¾
¾¾
¾ The electrical connection of the HPWH must be performed according to and conforming with all relevant
VDE, EN and IEC standards. Beyond that, the technical connection requirements of the local utility companies have to be observed.
Caution!
Any work on the hot water heat pump may only be performed by qualified persons! All relevant accident prevention regulations have to be observed!
2. Description
The HPWH is a heating appliance ready for connection and essentially consists of a domestic water tank,
the components of the refrigeration, air and water circuits as well as all control, regulating and monitoring
devices required for automatic operation.
The HPWH uses electricity to extract the heat from the drawn-in air for the generation of hot water. The
HPWH appliance type featuring an internal heat exchanger is suited for connection to a supplementary heat
source such as a boiler or solar system. A vertical well (inside ∅ ≥ 12 mm) is provided to accommodate an
external temperature sensor. The units are equipped with an electric immersion heater (1.5 kW) as standard.
The electric immersion heater fulfils four functions:
„#
Supplementary heater
Activating the immersion heater (via "Immersion heater" switch, see Section 3.4) in addition to the heat
pump approximately halves the water heating recovery time.
„#
Frost protection
Any time the temperature of the drawn-in air drops below 8 °C, the heat pump switches off and the
electric immersion heater is automatically switched on; the latter heats the water (only) until the preset
setpoint temperature is reached.
„#
Emergency heat
The electric heating element (immersion heater) will maintain the hot water supply when the heat pump
requires servicing.
„#
Higher water temperature
If the required hot water temperature is higher than the temperature that can be reached by the heat
pump (approx. 55 °C), the temperature can be increased to max. 85 °C by the immersion heater.
Note: For hot water temperatures
>>>>
55 °C the heat pump is switched off, and water heating
is accomplished by the immersion heater only.
Page 4 of 20
Power supply /
cable entries
Hot water outlet
R1" external thread
Circulation line
R 3/4" external thread
Hot water supply
R1" external thread
Condensate hose
(brought out at bottom)
Heating water return
R1" external thread
Cold water supply
R1" external thread
200
1) alternative condensate hose routing
max. 50
0
35
Ø
160
700
ca. 30
898
1206
1)
Ø
160
1610
1650
660
2.1 Refrigeration Cycle
The refrigeration cycle is a closed system in which the refrigerant R134a circulates as an energy carrier
. In a
finned heat exchanger, heat is extracted from the drawn in air at a low
evaporation temperature and trans-
ferred to the refrigerant. The vaporous refrigerant is drawn in by
a compressor and then compressed to a
higher pressure/temperature level; it is passed to the condenser where the heat absorbed in the evaporator
and part of the heat of the compressor motor is transferred to the water. Subsequently, the high condensing
pressure is reduced by means of a throttling device (expansion valve) to the level of the evaporating pressure, and in the evaporator the refrigerant can again absorb heat from the drawn-in air.
2.2 Water Circuit
The water circuits of the HPWH are dependent on the specific type (with or without internal heat exchanger).
They have to be field-installed.
The water connections (Fig. 1) are located at the rear of the unit.
Important Notes!
- Circulation line
From an energy-efficiency point of view, the provision of a circulation line should be dispensed with, if
possible.
If a circulation line for the hot water distribution system is connected, it must be fitted with a valve or simi-
lar device enabling it to be shut off to avoid any unnecessary loss of energy. Enabling the circulation is effected as required (time or on-demand control).
- Condensate drain: note Section 6.2 "Connection of Condensate Line".
Fig. 1: Water connections
Page 5 of 20
2.3 Safety Devices
The HPWH is equipped with the following safety features:
2.3.1 High-Pressure Pressostat (HP)
The high-pressure pressostat protects the heat pump from excessive operating pressures in the refrigeration
cycle. In the case of a malfunction, the pressostat switches off the heat pump. The heat pump is restarted
automatically as soon as the pressure in the refrigeration cycle has dropped to an acceptable level.
2.3.2 Safety Temperature Limiter for Immersion Heater (STL)
The STL protects the hot water installation from excessive temperature increases.
It is secured to the switch box panel, and the associated sensor is
located in the well of the immersion heater.
When the preset switching value (99 °C) is exceeded, the immersion heater is switched off.
The immersion heater cannot be restarted unless the hot water
temperature has fallen to ≤ 90 °C and the reset button (Fig. 2) on
the STL has subsequently been pressed.
Important Note!
-
The safety temperature limiter can be accessed after the
operating panel has been removed. Any interventions may therefore only be performed by qualified persons. Prior to opening the unit, the appliance must be disconnected from the power supply!
3. Controlling and Operating Concept
3. 1 Operating Panel of HPWH
Fig. 3: Operating panel of HPWH
'Immersion
heater'
'Heat exchanger'
switch
Analog display
of hot water temperature
Hot water
temperature dial
'Heat pump'
switch
Bild 2 : STB
85°
30°
B3
F2
STL
Partition
Operating panel
Reset button
Page 6 of 20
3.2 Hot Water Temperature Controller
The desired hot water temperature can be set using the rotary dial. If the storage tank temperature is lower
than the preset hot water temperature setpoint value, the heat pump is activated (provided the 'Heat pump'
switch is set to On).
The heat pump can achieve hot water temperatures of max. 55 °C. If higher temperatures are desired, the
immersion heater, provided as standard, can be used (see Section 3.4).
Notes for efficient energy consumption
Ö
ÖÖ
Ö For a high coefficient of performance of the integrated heat pump and low standby losses, the HWHP
should not normally be operated at water temperatures in excess of 45 °C (Fig. 4).
Ö
ÖÖ
Ö Only in exceptional cases should the tempera-
ture control be set to a higher value or the
immersion heater be activated manually.
Ö
ÖÖ
Ö To ensure optimum compressor runtimes and
a long compressor life, the heat pump should
not be manually switched on and off in quick
succession!
Fig. 4: Energy-saving setting
3.3 'Heat Pump' Switch
When the 'Heat pump' switch is placed in the 'On' position, the heat pump is ready for operation. When the
hot water temperature in the storage tank drops below the preset setpoint value, the heat pump is activated
until the desired hot water temperature is reached.
When the switch is in the 'Off' position, the operation of the heat pump is disabled. However, the hot water
temperature controller continues to be active and allows a tank charging pump of an additional heat exchanger to be activated via the 'Heat exchanger' relay output. In this case, the 'Heat exchanger' switch must
be in the 'On' position.
3.4 'Immersion Heater' Switch
The integrated 1.5 kW heating element can be activated by means of the 'immersion heater' switch when
there is an increased demand for hot water or a higher hot water temperature (> 55 ±2 °C) is desired.
When the 'immersion heater' switch is in the 'On' position, the storage tank content is heated up to the setpoint temperature of the immersion heater controller (factory setting 65 °C); for hot water temperatures > 55
°C, hot water preparation takes place exclusively via the immersion heater.
Although the 'Immersion heater' switch is in the 'OFF' position, the immersion heater will switch on automatically if there is a danger of frost (at air intake temperatures of 8 ±1,5°C); the water is then (only) heated until
the preset hot water temperature setpoint is reached.
Note!
- Immersion heater controller
The immersion heater controller is a second control device for the operating range of the immersion heater
that operates independently of the hot water controller. The switch-off temperature is factory-set at 65 °C.
The immersion heater controller operates in conjunction with the safety temperature limiter (see Fig. 2).
If a different temperature setpoint is required, it should be kept in mind that the controller is not accessible
until the upper front panel has been removed (see Fig. 8). The intervention may therefore only be performed
by qualified persons. Prior to opening the unit it must be disconnected from the power supply!
~ 45 °C
max.
~ 55 °C~ 27 °C
min.
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