Ochsner AQUA 54 Operating Instructions & Installation Instructions

BA OCHSNER AQUA TERRA_EN_V01.1.docx Page 1 of 72

Operating Instructions/Installation Instructions

OCHSNER AQUA OCHSNER TERRA

Brine/Water Heat pump

Heating/Cooling/Hot Water

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Contents 
General .................................................... 4 
1 Notes on the documentation .......................... 4 
2 Safety instructions .......................................... 4 
Description of the appliance ................... 5 
1 Function ......................................................... 5 
1.1 Refrigerant circuit ........................................... 5 
2 Heat pump ...................................................... 5 
2.1 Construction ................................................... 5 
2.2 Compressor .................................................... 5 
2.3 Housing .......................................................... 5 
Installation .............................................. 6 
1 Delivery .......................................................... 6 
2 Transport ........................................................ 6 
3 Tilting dimensions of indoor unit ..................... 6 
4 Select the place of instillation ......................... 6 
Electrical connection ............................... 7 
1 Check list: ....................................................... 7 
2 Guidelines ...................................................... 8 
3 Details of power supply .................................. 8 
4 Smart Grid ...................................................... 8 
5 EVU signal contact ......................................... 9 
6 Tariff without interruption ................................ 9 
7 Switching off via tariff relay: ............................ 9 
8 Off-peak tariff ................................................. 9 
9 Sensor wiring ................................................. 9 
10 Pumps, drives 230 VAC ............................... 10 
11 Safety thermostat (STB) in heating circuit .... 10 
12 Auxiliary heater hot water ............................. 10 
13 Terra control panel ....................................... 11 
Hydraulic connection: ........................... 12 
1 Heating connection....................................... 12 
2 Properties of the water ................................. 12 
3 Pressure maintenance system ..................... 12 
3.1 Cooling version ............................................ 12 
3.2 Passive cooling version ................................ 13 
4 Sizing fundamentals ..................................... 13 
5 Heating system connection .......................... 14 
5.1 Nominal flow rates in heating system ........... 14 
5.2 Flow rate measurement heating system ....... 14 
6 Setting the flow rate...................................... 14 
7 Pump test ..................................................... 15 
7.1 Reading flow rate ......................................... 15 
8 Heat source water connection ...................... 16 
8.1 Water quality ................................................ 16 
8.2 Flow meter ground water .............................. 17 
9 Heat source brine connection ....................... 18 
10 Flow rate metering brine ............................... 18 
10.1 Collection shaft ........................................ 18 
Commissioning ...................................... 19 
1 Before you switch on .................................... 19 
2 Check list for commissioning ........................ 19 
3 Required on-site personnel: ......................... 19 
4 For the system installer ................................ 20 
5 Commissioning OCHSNER .......................... 20 
System operation .................................. 21 
1 Menus: ......................................................... 21 
2 Safety functions ............................................ 22 
3 Appliance function ........................................ 22 
3.1 Heating circuit .............................................. 22 
3.2 Hot water ...................................................... 22 
3.3 Anti-Legionella switching .............................. 22 
4 System operation ......................................... 22 
4.1 Running costs ............................................... 22 
4.2 Flow temperatures ........................................ 22 
5 Ventilation ..................................................... 22 
6 Screed flooring drying ................................... 22 
Maintenance ......................................... 23 
1 Service work ................................................. 23 
Trouble shooting .................................. 24 
1 Error Codes OTE .......................................... 24 
2 Procedure for malfunctions ........................... 26 
3 Remedy small faults yourself ........................ 26 
4 Repairing your heat pump ............................ 26 
5 Customer Service ......................................... 27 
6 Cleaning ....................................................... 27 
Environment and recycling .................. 27 
1 Disposing of the packaging .......................... 27 
2 Decommissioning ......................................... 27 
3 Disposal of the appliance ............................. 27 
Warranty ............................................... 28 
1 Working hours and travel costs. ................... 30 
Annex .................................................... 31 
1 Technical Data AQUA .................................. 31 
2 Technical Data TERRA ................................ 33 
3 Performance curves TERRA 40 C ................ 35 
4 Performance curves TERRA 61 C ................ 35 
5 Performance curves TERRA 76 C ................ 36 
6 Performance curves AQUA 54 C .................. 36 
7 Performance curves AQUA 83 C .................. 37 
8 Performance curves AQUA 97 C .................. 37 
9 Pump characteristics .................................... 38 
10 Pump characteristic curves well pumps ........ 39 
11 Dimensions sheet SP 14-4 ........................... 40 
12 System diagram heat source water .............. 41 
13 System diagram heat source brine ............... 42 
14 Flow rates ..................................................... 43 
15 Ground collector heat source brine............... 43 
16 Electrical circuit diagrams ............................. 44 
Disassembly, assembly panel .............. 48 
1 Dismantling the top cover ............................. 49 
2 Disassembly of the upper cladding parts ...... 50 
3 Remove the back panel parts ....................... 52 
4 Dismantling of the wooden parts .................. 54 
5 Mounting the feet .......................................... 57 
Declaration of Conformity .................... 58 
ERP-Data .............................................. 62 
1 ERP-Data AQUA .......................................... 62 
2 ERP-Data TERRA ........................................ 65 
Directory of Illustrations ..................... 68 
1 Directory of Tables ....................................... 68 
 
 
 
 
  

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1 General

1.1 Notes on the documentation

The following pointers are a guideline for the com-

plete documentation

Please read your heat pump's operating instruc-

tions carefully from front to back. This will help

you to operate your heat pump better. This man-

ual is to be stored in the vicinity of the heat pump

and must be easily accessible. The precautionary

pointers below will be used in this document.

WARNING

Pointers which, if not heeded, can mean

danger to life and limb, and can also lead to

material damage. These pointers must

be heeded without fail.

ATTENTION

Pointers which, if not heeded, can lead to an

appliance malfunction and to material dam-

age. These pointers must be heeded

without fail.

NOTE

Attention

Pointers for work on electrical equip-

ment. These pointers must be heeded

without fail.

Attention - danger to life and limb

1.2 Safety instructions

Read this manual carefully before you begin to

commission/adjust the heat pump!

Converting or altering the appliance is not

allowed. Work on the appliance (repairs,

alterations) may only be carried out by

a

specialist authorised by the manufacturer.

All circuit breakers in the heating sys-

tem are to be turned off before any

work is carried out on terminal strips or

electrical connections (wiring).

The commissioning as well as the ser-

vicing of the appliances may only be

carried out by personnel which are au-

thorised by OCHSNER.

The installation of the appliances and

their electrical wiring may only be car-

ried out by a specialist according to lo-

cal regulations and codes of practice.

Protective functions for the heat pump

can be activated by the control. How-

ever, as the control is not certified as a

safety appliance, the protection against

failure or damage to the heat pump must be

adapted to the local instructions (for instance, by

additional external switching of the safety appli-

ances used.

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2 Description of the appliance

2.1 Function

The heat pump converts low temperature heat

(e.g. heat from the ground) into heat of higher

temperatures (heating water). The heat pump ex-

tracts from the ambience the stored solar energy

and returns this, plus drive energy (electricity for

the compressor) in the form of heat to the heating

and hot water circuits. The system consists of sep-

arate circuits, which are coupled by means of a

heat exchanger.

• Heat source system→ extraction of heat from

the environment

• Heat pump → refrigerant circuit.

• Heat use circuit → emission of heat to the

heating system.

2.1.1 Refrigerant circuit

The refrigerant circuit consists of:

• plate heat exchanger as evaporator

• compressor, mounted on a noise and vibration

dampening thick metal plate

• plate heat exchanger as condenser

• dryer, refrigerant sump, expansion valve,

safety equipment

• chlorine-free, non-flammable safety refriger-

ant and bio-degradable special compressor oil

WQA Heat pump WNA

Fig. 1: Refrigerant circuit

WQA – Heat source pump

WNA – Heat use system

2.2 Heat pump

The heat pumps models AQUA and TERRA are

compact appliances for indoor installation.

The heat pump is suitable for

inside installation and NOT for outside

installation

The heat extraction (heat source circuit) takes

place, depending on the type) via its own brine cir-

cuit, for instance ground heat systems: from flat-

plate collectors, deep trench (Künette) collectors,

ground probes or a well as the heat source)

The heat pump of the AQUA and TERRA series

function usually in a monovalent heating opera-

tion. The heat pumps can, however, be combined

at any time with a further heat generator.

2.2.1 Construction

2.2.2 Compressor

The fully hermetic SCROLL compressors are spe-

cially designed for heat pump use, i.e. for the high-

est loading. Various important constructive

measures protect the compressor, both under

normal operative conditions as well as overload-

ing. The compressors used by OCHSNER have the

highest performance and are the most durable.

The SCROLL compressors have only a few moving

parts and have no dynamic suction or pressure

valves. Furthermore, they are distinguished by a

very low vibration and noise level.

2.2.3 Housing

A profile frame, corrosion protected and with

elegant cladding plates. The complete cladding is

fitted with noise-dampening mats. A special load-

bearing noise-reducing underlay is supplied with

the heat pump.

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3 Installation

3.1 Delivery

The heat pump is delivered ready to install, i.e.

electrically pre-wired, on a one-way palette and

packed in foil. The cladding is packaged extra.

Report any transport damage immedi-

ately on receiving the heat pump!

3.2 Transport

The heat pump is to be stored and transported

packaged up. Careful transport at an angle up to

45° is permitted over short distances. Ambient

temperatures from –20°C to +45°C are permitted

both for transport and storage. The standard pack-

aging offers no weather or seawater protection.

Transport damage can only be recognised if this is

made known to the driver of the delivery vehicle

during, or immediately after unloading.

3.3 Tilting dimensions of indoor unit

The tilting dimension of the heat pump is 209cm:

Fig. 2: Titling dimension of the heat pump

3.4 Select the place of instillation

The heat pump TERRA can be installed in any dry

and frost free room. Installation must take place

on an even, horizontal surface.

Placement of the unit should be such that servic-

ing and maintenance are possible.

Fig. 3: Minimum clearances

The heat pump must be acoustically de-coupled

from the floor. Reverberant rooms can lead to in-

creased noise sensitivity A possible transfer of

noise to adjacent rooms cannot be ruled out and

should be considered when planning the system.

2090 mm

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4 Electrical connection

Attention!

Before wiring up the unit make sure

that the heating system carries no line

voltage.

DANGER of electrocution

Install all electrical connections ac-

cording to national and local Standards

Connecting work may only be carried

out by a certified specialist according

to this instruction!

The values indicated for fuse protection are given

solely for reference. The correct sizing of the

safety measures is the sole responsibility of the

electrician connecting the heat pump. The choice

of cable size is to be made by the electrician tak-

ing into account the ratings and cable lengths.

4.1 Check list:

• The stated voltage must be the same as the

house circuit voltage. Observe the specifica-

tions on the rating label!

• The heat pump connection must have been

approved by the competent utility before it is

carried out.

• The circuit breaker for the main power supply

circuit 230V/ 400VAC is to be a fuse that

switches off all poles in the event of a mal-

function.

• Should a leakage current switch (FI) be used,

this must be sensitive to universal current.

• The control circuit voltage 230VAC is to be

protected by a C13A circuit breaker.

• The supply cable must be protected against

overload and short circuiting.

• The regulations of the responsible energy

utility and the relevant EN-standards are to

be strictly adhered to.

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4.2 Guidelines

Position

min. cross-

section

Connecting cables 230VAC

are always to be sized ac-

cording to on-site condi-

tions

1.5 mm².

Control cable 230VAC

Pumps, valve motors

min. 1.0 mm²

Sensor cables:

(outside sensors, etc.) are

sensitive to EMC and must

always be run separately

(min. 20 cm) from

230V/400V cables. If sepa-

ration is not possible,

sheathed cables are to be

used. The sheath connec-

tion to the heat pump is on

Terminal PE

max. cable length 50 m!

2x 1.0 mm²

Bus cables

eBus from OTE control to

room remote control,

auxiliary modules, between

units (when cascading).

These cables must always

be laid as sheathed cables.

The sheath connection to

the heat pump is on Termi-

nal PE OCHSNER recom-

mends the following con-

ventional cables: Y(ST)Y)

2x2x0.8

ATTENTION: always use a

twisted two-wire cable!

Example. eBUS =

SIGNAL/GND

Do not connect GND to the

sheath!

2x2x0,8 mm²

Table 1: Cable selection

4.3 Details of power supply

The voltage supplies 400V~ and 230V~ are to be

run separately according to the circuit diagram.

The following power supplies are necessary:

Fig. 4: Power supply

400VAC for the compressor

Utility (EVU) Signal contact *

230V control voltage (inside switching box)

The power supply 230VAC to the control is on the

terminal strip X3 in the distribution box on the

switching box (L N PE).

Should the minimum clearances be-

tween sensor wiring and 230V/400V

(100mm) not be able to be adhered to,

sheathed wiring is to be used.

The values indicated for fuse protection are given

solely for reference. The correct sizing of the

safety measures is the sole responsibility of the

electrician connecting the heat pump.

OCHNSER provides no guarantee in cases of sys-

tem damage occurring due to incorrectly sized

safety devices!

4.4 Smart Grid

Special descriptions for the Smart Grid are availa-

ble on request.

*EVU (Utility)

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4.5 EVU signal contact

Attention!

230VAC control voltage is present on

the EVU contact!

Fig. 5: EVU signal contact

Remover the jumper and apply the wiring as

shown in the drawing If the EVU contact is inter-

rupted, the compressor and also, if applicable;

the auxiliary heater switch off.

4.6 Tariff without interruption

In the case of tariff switching without interrupted

power supply the heat pump will be temporarily

switched off by the utility. The control input EVU

on the inside unit is to be used for this. Terminal

strip X3 for activating the function, remove jumper

and connect cable.

4.7 Switching off via tariff relay:

For switching by means of a tariff relay (sealed by

the Utility on site) the power supply to the heat

pump compressor is switched off. In this case, the

EVU input is to be switched without fail via an

auxiliary contact on the tariff relay (NC contact).

(…otherwise ERROR)

4.8 Off-peak tariff

If the tariff switching takes place in the meter

(Off-peak Tariff), the EVU contact must not be ac-

tivated.

4.9 Sensor wiring

Do not place line voltage on the sensor

terminals! The control will otherwise

be destroyed.

The Type NTC5K temperature sensors of the OTE

control are supplied with 4.0m cable lengths.

Should these lengths not suffice, the cables can be

lengthened as required. Please use 2x 1.0mm²

flexible cable.

When installing the sensor cable, ensure that the

cables do not run parallel to alternate current

>230VAC cables.

Outside sensor TA

The outside sensor (TA) is to be mounted at ca. 2.5

m height on the outside wall of the building

(north-west side). It is to be ensured that the out-

side sensor is not directly affected by sun's radia-

tion or by wind, as this will adversely affect the

control behaviour. Do not place the sensor in the

direct vicinity of the evaporator either. Possible

danger of adverse influence on the control.

Mixing valve sensor TMK

If a mixing circuit is installed in addition to the di-

rect heating circuit, a mixing valve sensor must

also be installed. The mixing valve sensor is sup-

plied as a contact sensor with band clamp and con-

ductive paste. The mixing valve sensor is to be

mounted directly after the mixer pump. If multi-

layer or plastic pipework is being used, a suitable

metal bridge must be provided.

Hot water sensor TB

The hot water sensor is packed in the heat pump

on delivery. The sensor should be placed in the

bottom third of the tank, maximum in the middle.

Ochsner hot water tanks are fitted with corre-

sponding sleeves for the installation.

The current electro-magnetic compatibility regu-

lations are to be adhered to when installing the

wiring.

230V~

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Buffer sensors (TPO, TPM)

If a hydraulic separating buffer is used, 2 sensors

must be installed in the buffer. Differing sensor

placements are to be considered for:

• Heating buffer

• Heating or cooling buffer and

• Unifresh

The placement takes place as specified in the hy-

draulic plans.

4.10 Pumps, drives 230 VAC

Pumps, (heating circuit pumps, hot water charge

pumps) as well as drives (mixing valves, etc.) are

connected directly to the control.

A test-run may only be undertaken on a fully-pre-

pared system that is ready for commissioning! A

relay test can be carried out on the OTE control in

order to test the appropriate outputs (actuators).

4.11 Safety thermostat (STB) in heating

circuit

If a non-self-resetting safety thermostat (STB) is

installed on site, this STB is to be installed directly

in the power supply to the heating circuit pump

(not supplied).

4.12 Auxiliary heater hot water

A separate circuit breaker is to be provided in the

distribution box for the optional electrical auxiliary

heater in the hot water tank (Legionella protec-

tion). See El.-diagram in Annex. This function is op-

tional and thus not in the heat pump's scope of de-

livery.

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4.13 Terra control panel

Fig. 6: Control panel wiring TERRA basic wiring

Sizing of the connecting cable cross sections

must be according to local regulations.

ATTENTION Danger to life

and limb! Switch off all system power

supplies before starting electrical work!

PLAN view

Power Supply

3x 380-400VAC

(compressor)

Power Supply

220-240VAC

(Control voltage)

Heating circuit

mixing valve

Open - close

Pin.15/16/N/PE

WQP and WEP

pump

Temperature sensor

TMK (Mixing circuit)

Pin.43/GND

Temperature sensor

TA (outside tempera-

ture) Pin.44/GND

Temperature sensor

TPM (buffer middle)

Pin4/GND

Temperature sensor

TPO (buffer top)

Pin.45/GND

Temperature sensor

TB (hot-water sensor)

Pin46/GND

OTE control with

• Climate control

manager

• Cascade manager

• Heat manager

Heating circuit

pump 1

Pin.7/N/PE

Heating circuit

pump 2

Pin.8/N/PE

Auxiliary heater

hot water

Pin.10

Hot water

Active

Pin.13/14/N/PE

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5 Hydraulic connection:

5.1 Heating connection

The water and pressure in the system is to be reg-

ularly monitored by the system operator and ad-

justed if the pressure is too high or too low. The

flow rates in the heat system are monitored by the

integrated flow sensor. Furthermore, the specified

system service intervals as well as the system

checks must be adhered to.

If, during larger reconstruction work or after burst

piping the majority of the water in the heating sys-

tem has to be drained off and refilled, this must be

carried out in the presence of the OCHSNER works

customer service / OCHSNER authorised partner

(see Logbook) If exceptional refilling work is to be

carried out (e.g. reconstruction work or after burst

piping), a current water test report is to be made

and, if necessary, using this report, additives must

be used when refilling the heating system.

5.2 Properties of the water

The VDI 2035 resp. ÖNORM H5195-1 and 2 are to

be observed with respect to the properties and

quantities of heating system water, incl. filling and

topping up water.

In order to prevent damage due to scaling, the

hardness of the water must be tested before filling

the heating system. The total hardness of the wa-

ter must be:

4.0…8.5° dH at a pH-value from 7 to 9

The water must be softened if this value is ex-

ceeded. Desalinated water or rainwater must not

be used as this leads to increased corrosion.

Please observe!

Unsuitable filling or topping up water

gives rise to sedimentation and corro-

sion and can lead to system damage.

5.3 Pressure maintenance system

The primary pressure in the expansion vessel must

be checked before filling the system. This must be

adjusted to the height of the building. Static

height: Difference between the highest and lowest

points of the system.

Bench-mark value:

Primary pressure = static pressure + 0.3 bar.

Max. permissible operating pressure: 2.6 bar. Se-

lect a safety valve of 3.0 bar.

See ENISO 4126-1:2013-10-15 Part 1: Safety valves

A sufficient sizing of the hydraulic

safety and pressure maintenance

equipment is necessary for the opera-

tional safety of the system. An annual

control according to the Standards

must take place.

The installation of the appliances may

only be carried out by a specialist ac-

cording to

local regulations and codes of practice.

All heat pump connections are to be

mounted in a flexible fashion. Avoid vi-

bration transmission bridges when in-

stalling pipework. The pipework sizing

as well as the choice of circulation

pump is dependent on the relevant

heating system.

5.3.1 Cooling version

All cooling system components (pipework, fittings)

must be insulated against condensed water using

suitable non-permeable insulation material. This is

to be taken into consideration even more for flow

pipework from the heat pump to the buffer tank.

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5.3.2 Passive cooling version

In water/water heat pumps with passive

cooling applications,

it is essential that each cooling circuit has its

own mixing valve as well as

a room remote control to limit the dew point.

The diverting valve in the passive cooling

mode MUST be installed in the heat

pump's evaporator outlet. Corresponding

circuit diagrams are part of the scope of sup-

ply of every heat pump.

5.4 Sizing fundamentals

Please observe the following sizing fundamentals.

The flow rate in the pipe-network must not

exceed 0.8 m/s. (noise/resistance).

In order to ensure a comfortable and disturbance-

free operation, a temperature difference of 5K be-

tween the heating system flow and return is to be

maintained.

Fig. 7: Hydraulic heat pump connection

When sizing the heating system

pump/buffer charge pump, the internal

pressure differential of the heat pump

condenser is to be taken into consider-

ation (see technical data Pet seq)!

If this is not done, there is a danger that the heat

pump will not reach the specified catalogue rating

and under certain conditions will be shut off by

means of the high-pressure switch,→ ERROR re-

port (see operation instructions OTE).

Integrated heating system circulation pumps are

sized as buffer charge pumps (technical data – see

annex).

It is recommended to install a decoupling tank

(separation tank, buffer tank) or a header tank

with the heat pump. A bleeder valve (manual

bleeding) must be fitted at the highest point in the

pipework system.

It must be ensured that no foreign bodies can en-

ter the pipework (dust, dirt, etc.). A filter sieve can

be mounted in the return pipework to the heat

pump in order to collect any dirt. Make sure that

the dirt collector is easy to clean for maintenance

purposes.

A clogged sieve affects the heat transfer consider-

ably and can lead to a switch off via the high-pres-

sure safety switch! Valves and thermometers are

to be fitted to the flow and return pipework so

that the water flow and the running condition of

the heat pump can be monitored at all times. A

drain pipe is to be installed at the lowest point in

the pipework so that the system can be drained.

The heating system pipework is to be sized ac-

cording to the technical data of the heat pump.

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5.5 Heating system connection

5.5.1 Nominal flow rates in heating system

The nominal flow rates in the heating system are

to be ensured. Deviating flow rates can lead to a

heat pump safety switch off.

5.5.2 Flow rate measurement heating sys-

tem

The flow rate meter is part of the heat pump and

must be installed by the system installer according

to the OCHSNER installation guidelines. Please ob-

serve the instructions in the installation manual

for flow rate measuring meters.

If the flow rate meter is either not installed, or in-

correctly installed, OCHSNER will not undertake

the commissioning of the system.

OCHSNER accepts no liability for possible damage

which may occur if the flow rate meter is either

not installed, incorrectly installed, sized or wired

up.

Fig. 8: Flow rate measurement heating system

5.6 Setting the flow rate

The nominal flow rate (see /) is to be ensured in all

types of operation /hot water charging, heating,

cooling via a separate buffer tank etc.). The flow

rates are measured by the installed flow meter

and displayed on the OTE control. The flow rate is

adjusted by means of the adjustment screw on the

circulation pump supplied. For a hydraulic regula-

tion corresponding to the standards, especially by

combined heating rsp. heating/cooling operation

with hot water heating, appropriate pipe-run reg-

ulating valves are to be fitted and the system cali-

brated as required.

Fig. 9: Setting the flow rate of the EC pump

-c

Set the flow rate by

turning the red adjustment screw.

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5.7 Pump test

Switch on the buffer charge pump / heat source pump via the relay test.

Fig. 10: Switch on heat generator pump

5.7.1 Reading flow rate

The measured flow rate is displayed; this must correspond to the nominal flow.

Fig. 11: Reading flow rate

HEAT PUMP

ESC

ENTER

OCHSNER OTE

MENU

Sa 25.06.2016

08:10

Switched off

5

Main menue

HEATING CIRCUIT 1

HEATING CIRCUIT 2

HOT WATER

HEAT PUMP

ESC

ENTER

1

HEAT PUMP

Operation mode

Operational data

ESC

ENTER

Settings

Relay test

01-076

Compressor

100

01-077

HEAT PUMP

01-022

Pump heat gener

20

Heat source pum

45

ESC

ENTER

20%

ESC

01-022

HEAT PUMP

Pump heat generator

ESC

01-077

HEAT PUMP

Heat source pump

/ fan

45%

HEAT PUMP

ESC

ENTER

OCHSNER OTE

MENU

Sa 25.06.2016

08:10

Switched off

5

Main menue

HEATING CIRCUIT 1

HEATING CIRCUIT 2

HOT WATER

HEAT PUMP

ESC

ENTER

1

HEAT PUMP

Operation mode

Operational data

Settings

Relais test

ESC

ENTER

HEAT PUMP

21-002

Flow rate heat

50

21-090

Flow rate heat

55

23-001

Thermal energy

ESC

ENTER

99

23-010

Thermal energy

12

21-002

HEAT PUMP

Flow rate heat sink

50.1 l/min

ESC

21-002

HEAT PUMP

Flow rate heat source

55.4 l/min

BA OCHSNER AQUA TERRA_EN_V01.1.docx Page 16 of 72

5.8 Heat source water connection

If ground water is to be used as heat carrier me-

dium, only clean drinking-quality water with no

clouding particles must be used. When using

ground water, a cleanable large surface filter with

a mesh size of 500 Microns is to be installed. For

increased safety, we recommend the use of our

centrifugal filter.

Before installing the system, a water

analysis, which gives information on the

water properties, must be carried out.

- The removal of water for analysis must

take place shortly before the end of a con-

tinuous pumping operation and immedi-

ately analysed (otherwise, incorrect water

values will be used for analysis). We fur-

thermore recommend an annual in testing

of the water quality.

- The flow rate in the pipe-network must

not exceed 0.8 m/s.

- In order to ensure a comfortable and dis-

turbance-free operation, a temperature

difference of 3K between the heating sys-

tem flow and return is to be maintained.

- The temperature range limits for the heat

source are between +8°C and +22°C

OCHSNER accepts no liability for the correctness

of the analyses resp. changes in water quality.

5.8.1 Water quality

Aggressive and coking materials can lead to corro-

sion and clogging of the evaporator, the feed

pump and the pipework (heat pump malfunction).

Adhere to the values in

ATTENTION:

A water analysis can only be a momen-

tary value. The values can fluctuate

considerably in the course of a year.

The evaluation of a meaningful use can, however,

only be carried out with the measured values!

Table 1: Water quality

Legend:

+ = the material has normally good resistance

- = not recommended for use

0 = corrosion can occur if several

factors are evaluated with 0

Notes:

1.) If these limiting values cannot be ensured, a

stainless steel soldered stainless steel heat ex-

changer must be installed in place of the cop-

per soldered stainless steel heat exchanger.

This information must be made know when or-

dering!

2.) Due to probable clogging, we do not recom-

mend installing a water/water heat pump.

3.) Besides iron and manganese, the chloride con-

centration is essentially decisive for the deploy-

ment of a stainless steel soldered heat ex-

changer.

Copper

braized

Stainless

steel

braized

1.)

 > 500 -- +

< 6 0 0

6 - 8 + +

> 8 -- 0

< 10 + +

 +

+

 0

+

> 200 --

-- 3.)

< 50 +

+

 0

+

> 100 --

0

< 5 +

+

 0

+

> 20 --

0

< 1 +

+

 0

+

> 8 --

+

< 2 +

+

 0

+

> 20 --

+

2.) [mg(l] > 0,2 - -- 3.)

2.) [mg(l] > 0,05 - -- 3.)

1.) [mg(l] < 5 + +

1.) [mg(l] < 0,5 + +

Iron with Manganese

Mangan - Manganese

Sulphide

Chlorine (free)

Oxygen

1.)

[mg/l]

Ammonium

1.)

[mg/l]

Chloride

1.)

[mg/l]

Sulphate

1.)

[mg/l]

Carbon dioxide (aggressive

free)

1.)

[mg/l]

Plate heat exchanger

Electric conductivity

pH-Value

1.)

BA OCHSNER AQUA TERRA_EN_V01.1.docx Page 17 of 72

5.8.2 Flow meter ground water

The flow rate meter is part of the heat pump and

must be installed by the system installer according

to the OCHSNER installation guidelines. Please ob-

serve the instructions in the installation manual

for flow rate measuring meters.

If the flow rate meter is either not installed, or in-

correctly installed, OCHSNER will not undertake

the commissioning of the system.

OCHSNER accepts no liability for possi-

ble damage which may occur if the flow

rate meter is either not installed, incor-

rectly installed, sized or wired up.

Fig. 12: Installation of flow rate sensor heat source ground waterand heating system

Fig. 13: Wall ducting

BA OCHSNER AQUA TERRA_EN_V01.1.docx Page 18 of 72

5.9 Heat source brine connection

The sizing and installation of the brine collector is

the responsibility of the installer and is to be car-

ried out according to OCHSNER guidelines. The

heat source connection is to be executed in such a

way that the brine circuit can be flushed and/or

bled at any time. The amount of heat carrier fluid

required is to be calculated beforehand. This is a

product of the pipework length and pipe dimen-

sion as well as the heat pump water content The

heat carrier fluid is to be poured into a clean con-

tainer in one pour and well stirred.

Ethylene glycol in a mixture of 25%-30% by volume

is to be used as anti-freeze, this providing protec-

tion down to –12 to –15°C.

The anti-freeze fluid must not be mixed with ag-

gressive raw water (pH-value below 7.0), distilled

water

or rain water.

NOTE:

As the protection against corrosion de-

creases in the course of time, a two-

yearly water quality check is recom-

mended

The frost protection, the pH-value, as well as the

rest alkalinity are to be checked. This check is to

be carried out with a representative quantity (for

instance. 3x 1/4l). The correct mix relationship is

to be tested with a refractometer. The filling is to

be carried out in such a way as to ensure the

proper bleeding of the system

In order to ensure a reliable operation,

a temperature difference of 3K

between the evaporator (heat source)

flow and return

is to be maintained.

The flow rate in the pipe-network must

not exceed 0.8 m/s. (noise/resistance).

5.10 Flow rate metering brine

The flow rate meter is part of the heat pump and

must be installed by the system installer according

to the OCHSNER installation guidelines. Please ob-

serve the instructions in the installation manual

for flow rate measuring meters. If the flow rate

meter is either not installed, or incorrectly in-

stalled, OCHSNER will not undertake the commis-

sioning of the system.

OCHSNER accepts no liability for possi-

ble damage which may occur if the flow

rate meter is either not installed, incor-

rectly installed, sized or wired up.

Fig. 14: Flow meter installation in heat source brine system

5.10.1 Collection shaft

If a collection shaft is to be installed, a

lined conduit with a slope towards the collecting

shaft

is to be used.

Fig. 15: Collection shaft

BA OCHSNER AQUA TERRA_EN_V01.1.docx Page 19 of 72

6 Commissioning

6.1 Before you switch on

The heat pump has no separate main switch. In

emergencies, the system must be switched off by

means of the specified circuit breakers. The circuit

breakers must be so reachable as to ensure a

switching off at any time.

Attention - danger to life and limb

The initial switching on of the electrical

systems may only take place in the pres-

ence of a suitably trained and certified electrician.

Switch the power supply to the system ON (or

OFF) only when:

• Nobody can be endangered

• All heat pump installation work is com-

plete

• All wiring is completely connected

• The voltages correspond to the documen-

tation

• The hydraulic system is filled with water

and

• the system has been completely bled

The power supply to the compressor may not be

switched on before the refrigerant circuit and the

hydraulics have been filled with the appropriate

medium.

Once all the above conditions have been met, the

control voltage 230V~ (F1 fuse) can be switched

on in order to check the individual functions.

Check carefully all sensors and their values for

plausibility and all hydraulic outlets for correct

function.

Attention:

Operating the heat pump with no, or

too little refrigerant leads to damage to

the appliance. Operating the circulation pumps

with no water in the system leads to destruction

of the pump.

Commissioning must be carried out by Ochsner

Customer Service or a service partner authorised

by Ochsner. The Ochsner commissioning guide-

lines must be adhered to. Operating the system

without a correct commissioning will lead to a for-

feiture of the guarantee and warranty rights.

6.2 Check list for commissioning

Adhere to the following sequence:

1. Check heating system circuit: System-

pressure, expansion vessel function,

bleeding valves, quantity adjustment.

The system installer is to ensure that, at

the start of

commissioning, the system tempera-

ture/buffer temperature does not exceed

30°C.

2. Check the flow rates! The flow rates at

heat source and heat use systems are

measured by the integrated flow sensors

and monitored. These can be read off

from the display of the OTE-control.

3. for brine/water heat pumps

4. System pressure, frost protection mix-

ture (-12°C), bleeding

5. Check whether all non-return valves are

open

6. Check power supplies and circuit break-

ers

7. Check the electrical connections to the

system components, including all re-

quired safety equipment, according to

the wiring diagram.

8. Switch on 3-phase supply to the heat

pump.

9. Control 3-phase supply and right-hand

rotary field

10. Switch on control voltage supply

11. Relay test on the output terminals

12. Adjust the system according to user re-

quirements and document these

13. Hand over system to operator

6.3 Required on-site personnel:

Electrician, installer and future system supervisor

MUST be present for the system orientation dur-

ing commissioning.

BA OCHSNER AQUA TERRA_EN_V01.1.docx Page 20 of 72

6.4 For the system installer

The OCHSNER Customer Service engineer / Cus-

tomer Service partner will execute the user-spe-

cific settings according to the specifications in the

system data sheet. Should the system installer not

be present during commissioning, or if there is no

fully completed system data sheet present, the

system will be commissioned using the control's

factory settings.

1. OCHSNER accepts no liability for possible

malfunctioning (heating curve too low, bi-

valent point too high, etc.). Any claims re-

sulting from this will be invoiced to the

system installer.

2. In order to run the system economically, it

is absolutely necessary that the system be

balanced hydraulically and that the con-

trol settings are coordinated to the system

requirements.

3. Other necessary work performed, such as

bleeding the system, electrical wiring, ad-

ditional instruction etc., that do not fall

within the realm of the OCHSNER firm’s

duties will be invoiced separately

6.5 Commissioning OCHSNER

Commissioning requests are to be made to

OCHSNER Customer Service. A date for commis-

sioning can only be made when the completed and

signed commissioning form is handed in.

Please make appointments for fixed commission-

ing dates at least 2 weeks in advance.

To undergo the commissioning process, the fol-

lowing work should be complete:

• The heating and hot-water systems must be

completely installed, filled, bled, and hydrau-

lically adjusted.

• The electric connection from the main circuit

3x400V/50Hz, (control and main voltage cir-

cuit VX, machine drives 230V/50Hz) and other

electrical installations on the building site are

complete. Confirmation of proper field rota-

tion, no provisional modifications!

• The brine system must be filled and bled of air.

Work that needs to be carried out by OCHSNER:

• Check the refrigerant circuit

• Check minimum flow rate

• Calibrating the safety equipment

• Controlling the switching sequence

• Creating a commissioning protocol

• Basic control settings

• Explanation of the heat pump and control to

the end user (assuming he/she is present at

commissioning).

• Optional: Configure the system by means of

the commissioning (IBN) assistant

• Store the sensor configuration

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Ochsner AQUA 54 Operating Instructions & Installation Instructions

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