Gorenje HPWW7 Installation manual

1
gorenje
Heat Pump
WATER-TO-WATER
Instructions for Installation and Start-up

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1. IN EX

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1. Introduction
These Instructions explain the procedure for installation of the water-to-water heat pump. They
include a description of the start-up procedure that should be carried out by a competent expert
authorised by the manufacturer. Use the following Contents to find the relevant Chapters for the
correct mounting and installation of the pump.

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2. Safety Warnings
The heat pump is NOT firmly fixed to the wood transport palette.
Do not tilt the pump more than 45
o
during transport.
The sidewalls of the pump are not load-bearing, and must not be loaded during installation.
Before connection, flush the piping of the central heating system.
Install a filter on the heat source inlet in order to protect the evaporator from impurities deposit.
In the water-to-water heat pump, make sure the water quality from the well meets the
requirements for water pureness.
With power supply connection, observe the correct rotation field and the proper diameters of
the cable cords used.
The first start-up must be carried out by an authorised service provider in compliance with the
Installation and Start-up Instructions.
In order to prevent oxidation in the central heating system and heat pump condenser, add an
anti-corrosive agent to the water.
Any repairs and adjustments to the pump must be made by a Gorenje authorised servicing
technician only.
Before any repair, disconnect the pump from the power supply source.
Warning labels are fixed to the rear wall of the heat pump, and
a wiring diagram can be found on the inner side of the metal
cover.

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Statutory Requirements
This heat pump was made in compliance with the applicable standards and complies with the
related requirements.
The heat pump may be connected to a heat source, heating system or electric power supply, in
compliance with applicable regulations.
Electric connection must be fixed, via a circuit breaker switch that cuts off supply to all conductors.
All conductors must have a diameter that corresponds with the power supply.
The pump must be connected to an adequate earthing connection.

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3. Use
Purpose of Use
The water-to-water heat pump is designed for installation in residential buildings (e.g., when
renovating the boiler room or as a heating source in newly constructed buildings). Underground
water of adequate quality and temperature is used as a heat source.
Operating Principles
Underground water of adequate quality and temperature (17 to 13°C) is claimed by means of
immersion pump from a well, at adequate depth. This water is transferred to the evaporator in the
heat pump. The heat accumulated in the evaporator in the heat pump is transferred to the
refrigerant, cooling down the underground water by 2 to 4°C; the cooled water is then returned to
underground some 15 m away from the point of collection, in the direction of the underground
water flow.
The refrigerant sucked by the electrically driven compressor in the heat pump is transferred to
higher pressure (higher temperature level). The power generated by the compressor is mostly
transferred to the refrigerant.
Refrigerant on the higher temperature level is transferred into condenser, transferring the heat to
heating water. The heating water may be heated up to 55 °).
EVAPORATOR COMPRESSOR CONDENSER
Chart of energy flow through the heat pump unit
Heat from
ambient
Produced
heat for
heating
Electric
energy
EXPANSION VALVE

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4. Tehnical caracteristic
The construction of the heat pump unit allows installation indoors; the unit housing is made of
sheet metal, incorporating an operating panel used for adjustment of the required parameters by
the user. The control unit, located under the upper part of the unit, is used for connection to the
electricity supply and for connection of the circulating pump, temperature probes and mixing
valves.
The unit cooling circuit is filled with R407C refrigerant. This type of refrigerant is non-combustible
and does not contain ozone-depleting substances.
Water-to-water heat pump
Basic component parts of the heat pump
unit:
1. CONTROL UNIT
2. CONDENSER
3. EVAPORATOR
4. COMPRESSOR
5. EXPANSION VALVE
OUTER DIMENSIONS
A depth: 580 mm
B height: 935 mm
C width: 654mm
A
B
C

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Legend
1 – Measuring point – riser - heating
2 – Heat exchanger (condenser)
3 - Measuring point – return line - heating
4 – Heat exchanger
5 – Pressure switch – low pressure
6 – Compressor
7 - Compressor power supply terminal
8 – Compressor return pipe (suction)
9 – Sight glass fitting for control of refrigerant flow
10 – Compressor outlet pipe (pressure)
11 – Drying filter
12 – Pressure switch

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Legend
1 – Servicing connection (refrigerant pressure at compressor outlet)
2 – Servicing connection (refrigerant pressure at compressor inlet)
3 – Mechanical expansion valve
4 – Servicing connection (refrigerant pressure at evaporator inlet)
5 – Heat exchanger (evaporator)
6 – Flow-rate switch (media flow indicator)
7 - Measuring point - heat source media outlet
8 - Measuring point - heat source media inlet

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Volumes and material – CON ENSER and EVAPORATOR
HPWW7 HPWW9 HPWW12 HPWW14 HPWW18
CONDENSER
Material Pure copperr
AISI316
Pure copper
AISI316
Pure copper
AISI316
Pure copper
AISI316
Pure copper
AISI316
Refrigerant volume (I)
1,13 1,24 1,80 2,36 3,15
Water volume (I)
1,24 1,35 1,92 2,48 3,27
EVAPORATOR
Material
Steel
1.4404
(316L)
Steel
1.4404
(316L)
Steel
1.4404
(316L)
Steel
1.4404
(316L)
Steel
1.4404
(316L)
Refrigerant volume (I) 1,1 1,1 1,4 1,6 1,8
Water volume (I) 1,2 1,2 1,9 2,1 2,5

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5. Tehnical caracteristic
UNIT
MODEL HPWW7 HPWW 9 HPWW12 HPWW14 HPWW18
Version
Placing Indoor Indoor Indoor Indoor Indoor
Capacity
Limit operating
temperature St.C.
Heated water flow +10 °C do +55 °C
Water (heat source) +7 °C do +25 °C
Heating power/COP
EN 14511 kW/…
pri W7 / W35 7,8/5,0 10,8/5,0 13,2/5,1 16,2/5,2
pri W7 / W55 7,2/2,9 9,9/2,9 12,1/2,8 14,7/3,0
pri W10 / W35 8,4/5,4 11,6/5,4 14,2/5,4 17,7/5,6
pri W10 / W45 8,0/4,1 11,1/4,1 13,7/4,2 16,8/4,3
pri W10 / W55 7,7/3,1 10,6/3,1 13,0/3,1 16,0/3,3
Sound power level dB(A)
Heating water flow
rate at internal
pressure difference m3/h/Pa
1,46/8400
2,01/9800 2,46/11000 3,06/10500
Refrigerant type R407C R407C R407C R407C R407C
Charging kg 1,6 1,7 1,8 2,1
Oil in compressor Ester oil Ester oil Ester oil Ester oil Ester oil
Volume l 111,1 1,4 1,4
Pressure switch
level
Low pressure bar 2,8 2,8 2,8 2,8 2,8
High pressure bar 28 28 28 28 28
Dimensions and
weight of internal
unit:

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Length mm 654 654 654 654 654
Depth mm 580 580 580 580 580
Height mm 935 935 935 935 935
Weight kg 86 97 121 137 142
Dimensions and
weight of packaged
heat pump
Length mm 725 725 725 725 725
Depth mm 710 710 710 710 710
Height mm 1030 1030 1030 1030 1030
Weight kg 109 120 144 160 165
Connection to power
supply
Rated voltage/circuit
breaker ( a l l o w e d d e v i a t i o n )
V/A
(±10%) 400/10 400/10 400/10 400/16 400/16
Rated electric power
W10/W35 kW 1,21 1,56 2,15 2,63 3,16
Rated current A 2,18 2,81 3,88 4,75 5,70
Other
Option for passive
cooling da da da da da
Conformity mark CE CE CE CE CE
Characteristics of the water-to-water heat pump power depending on the underground water inlet
temperature (with defined data on its flow rate and flow rate of the heating water), are defined in
the Characteristics Charts, which are enclosed as a separate document.

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6. elivery and Installation
Storage and Transport
Transport the heat pump in an upright position; when absolutely necessary, the pump may be tilted
to a maximum of 45
o
. Be careful during transport to avoid damage to the housing or to vital parts of
the unit.
The heat pump can also be moved without the use of the palette, by using the openings on the
bottom sidewalls. Push the metal rods through the opening (adequate load-bearing capacity and
max. diameter of 30 mm).
Store the heat pump in an upright position in a dry and clean place.
Placing and Installation
Place the heat pump in a well-ventilated room, avoid exposure to extreme dust and aggressive
substances. Make sure the temperature in the room is never below freezing and the air humidity is
not too high.
Place the heat pump horizontally on a firm floor with adequate load-bearing capacity. The lower
part of the frame should stand firmly on the floor in order to assure adequate sound protection.
Make sure the room has a floor drain.
Place the heat pump in a room where the noise will not disturb the environment, placing the rear
wall of the pump facing the wall. Do not place the heat pump in a room adjacent to a bedroom or
other rooms where the noise could disturb the residents.
Do not install the piping along bedroom walls or walls of other rooms where the noise might disturb
the residents. Let the installation technician mount special damping elements between the unit and
the piping in order to reduce vibration transfer from the unit into the environment. Next to the unit
dimensions, take into account additional space behind, above and to the left and right of the unit,
and especially in front of the unit.

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Make sure there is min. 1 m free space above the unit. Distance from the wall depends on the
position of the connection pipes and electricity supply cables and may be larger if necessary.
Do not put object on cover!

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7. Hydraulic Connection
Water-to-water heat pump connections
DIMENSIONS FOR CONNECTION (mm)
All connections: 5/4˘
Outer threads
A Cable entry for electricity supply
conduits
B Heat source – inlet to heat pump
C Heat source – outlet from heat pump
D Heating water outlet
E Return line for heating water
Connection to Heating Circuit
Before connecting the heat pump unit to a heating circuit, make sure to flush the heat pump with
water. This will eliminate eventual solid particles, dust, sealing material remains and other
impurities. Eventual impurities get deposited on the condenser and may cause malfunctions during
operation!
All required elements must be included in the heating circuit (safety valve, pressure metre,
expansion vessel, bleed valve, charging valve, etc.) in order to assure proper operation of the
heating circuit according to the selected hydraulic drawing (see Chapter: Hydraulic Drawings) and
applicable regulations related to installation of heating devices.
After completed connection of the heat pump to the heating circuit, fill the system with water, de-
aerate and test for eventual leakage. The pressure in the cold heating system should be a
minimum of 1 bar. During heating, due to increased volume of the heating water, the pressure may

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increase up to max. 2.5 bar. The increased volume will be absorbed by the expansion vessel,
whose dimensions must correlate with the capacity of the heating system (not all heating circuits
have a related expansion vessel). The safety valve should be triggered when the pressure reaches
3 bar.
Heating Water Minimum Flow Rate
During operation of the heat pump, the minimum required heating water flow rate must be assured!
This can be achieved by using various techniques including correct adjustment of the over-flow
valve or a valve manifold with no pressure differences.
Heat source temperature
oC
From To
Max. temperature difference between the pre-
flow and the return flow of the heating circuit
water oK
7 12 10
13 18 11
19 25 12
If after testing the heating circuit the heat pump fails to operate and if there is danger of freezing,
the heating circuit must be discharged in order to prevent damage to the heating system.

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Borehole fo Pumping the Water (Well)
Water from the underground that is needed for the operation of the water-to-water heat pump is
pumped from the well (borehole) The quantity of the groundwater must correspond to the heat
pump flow rate. The quantity of the ground water, reliability of the source and quality of water
largely depend on geological characteristics of the area; therefore make sure to verify all the
characteristics before making the borehole.
The depth of the borehole depend on the availability of the water source.
Required water pureness
Instal a filter at the heat inlet source on the heat pump to prevent impurities and protect the
evaporator against eventual damages. During the first months of use, the filter should be cleaned
more often. Once the amount of impurities is reduced, the cleaning intervals may be longer.
The underground water must not contain elements that could cause deposits in the heat
exchanger. To prevent depositing of iron in the heat pump system, the uppper limit value is for Iron
< 0,2mg/l and Manganese < 0,1mg/l. Before starting to use the water from the well, send a water
sample to the laboratory for an analyses to make sure the water quality corresponds to required
values. This will reduce the malfunctions to the heat pump system caused by impurities in water.
Use of surface water or salt water is not allowed.

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Borehole for Returning the Water (secondary borehole)
Water that is sligthly cooled (2 to 3
o
C) is dishcarged from the water pump and returned to the
underground water source. The borehole shall be made on a distance 10 – 15 m along the water
flow direction in order to avoid mixing the warm source (inlet water) and the cold source (outlet
water). The capacity of the secondary borehole must correspond to the capacity of the pumping
well. Let an expert in geology make the boreholes.
Heat pump
Secondary
borehole
Pumping
borehole
Boiler room
Undergroundn water flow

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8. Hydraulic iagrams
Various applications (for various heat sources and extra features) are presented in the form of
basic hydraulic drawings.
The heat source for each hydraulic diagram can be selected with the adjustment of parameters.
In order to include extra features (solar cells, swimming pool, etc.) the parameters need to be
adjusted accordingly.
The wiring diagrams are basic diagrams and do not include safety elements (expansion vessels,
safety valves, bleed valves, etc.); these should be provided by the installation technician!
Detailed hydraulic drawings with complete elements are composed as separate documents.
Basic iagrams
The following wiring diagrams can be selected by entering the number of the diagram in parameter
5700 (setting 'Adjustment’ before start, menu 'Configuration'). For operation of the basic diagram,
parameter 5700 must be adjusted and all the sensors connected.
All sensors included in the diagram must be connected. Component parts marked with dashed
lines are optional and are not indispensible for operation.

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Diagram 1: Ground/water heat pump with direct heating circuit.
Multifunction inlets/outlets:
RVS61
Diagram 2: Ground/water heat pump with direct heating circuit, sanitary water tank
and Q3 pump.
Multifunctional inlets/outlets:
RVS61