ESP Varimax 20 ASHP Installation And Operation Manual

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ESP VARIMAX 20 ASHP

Installation and

Operation Manual

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WARNING !

READ THIS BEFORE

INSTALLING

THE UNIT.

The installation of all un-vented water heating systems above 15 litres MUST comply with local area Building Regulations. It is a legal requirement that the local Building Control Officer be notified of any proposed installation.

UK regulations require an appropriately sized expansion vessel (internal or external) to be incorporated, safety devices to prevent the stored water exceeding 100°C, and pipe work to convey discharged hot water safely away from the safety devices.

Furthermore, the installation must be carried out by an engineer who has successfully completed a recognised course in the installation of un-vented heating systems such as CITB. Failure to fit the unit correctly and in accordance with regulations may affect its safety, efficiency and WILL invalidate any guarantee.

THE UNIT MUST BE INSTALLED, COMMISSIONED AND MAINTAINED BY A COMPETENT INSTALLER IN ACCORDANCE WITH BUILDING REGULATION G3 (ENGLAND AND WALES), TECHNICAL STANDARD P3 (SCOTLAND) OR BUILDING REGULATION P5 (NORTHERN IRELAND) AND THE WATER FITTING REGULATIONS (ENGLAND AND WALES) OR WATER BYELAWS (SCOTLAND). FOLLOWING INSTALLATION AND COMMISSIONING, THE OPERATION OF THE UNIT SHOULD BE EXPLAINED TO THE USER AND THESE INSTRUCTIONS LEFT WITH THEM FOR FUTURE REFERENCE.

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Contents:

1.0 Preface

1.1 Features of the Varimax 20 ASHP

2.0 Safety Precautions

3.0 Varimax 20 Specifications

3.1 Appearance

3.2 Dimensions

4.0 Choosing the right heat pump

4.1 Heat Load Calculation

4.2 Varimax 20 Output Statistics

4.3 Emitter systems

5.0 Installation

5.1 Where to use and Where to Site the unit

5.2 Location of the Unit

5.3 Transporting the Unit

5.4 Plumbing Considerations

6.0 Hydraulic Connection

6.1 Expansion vessels

6.2 Flow Switch

6.3 Flexi Hoses

6.4 Automatic bleed valves

6.5 Transit Bung

6.6 In-Line Filter

6.7 Flow Setter

6.8 TRVs

6.9 Distribution Water Pump

6.10 Glycol

7.0 Electrical Connection

7.1 Warning Notes

7.2 Before You Start

7.3 MCB

7.4 Isolation Switch

7.5 Cable Routing

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7.6 Wiring-in The Unit

8.0 Unit Specifications

9.0 Commissioning

9.1 Pre-Start Checks

9.2 Switching on the Unit

10.0 UNIT CONTROLLER

10.1 main Interface

10.2 Basic Operation

10.3 Start-UP and Shut-Down

10.4 Setting the Target Temperature

10.5 Using the Premium User Interface

10.6 Setting the Time

10.7 Setting the Timers

10.8 Cancelling the Timers

10.9 Checking the Status of the ASHP

10.10 Locking the Display

10.11 Fault Displays

11.0 Maintenance

11.1 Essential Checks

11.2 Advisory Checks

12.0 Trouble Shooting

12.1 Error Codes

12.2 Simple Faultfinding

13.0 Wiring Diagram

14.0 Guarantee

14.1 Guarantee Terms

15.0 Environmental Information

16.0 Weather Compensation

17.0 Performance

18.0 Parameter List

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1.0 Preface:

This manual includes important information about the installation and maintenance of the ESP Varimax 20 inverter driven air source heat pump (ASHP) unit. Please read this manual carefully before installing or carrying out maintenance works on the unit. Please note that, failure to observe the provisions in this manual will invalidate any warranty on the unit and may lead to loss and/or damage to people and/or property for which ESP will not be liable. All ESP ASHPs are covered by the warranty contained in the ESP Terms and conditions of Business a copy of which will have been provided to you prior to your purchase.

The Varimax 20 must only be installed by suitably qualified personnel.

The Varimax 20 air source water heat pump is a high efficiency, energy saving and environmentally friendly unit that should be used primarily for space heating. It can work with any kind of heat emitter scheme such as under floor heating, the ESP Thermovec fan coil unit or traditional radiators. The Varimax 20 can also be used to generate domestic hot water (DHW) for sanitary purpose although ESP strongly recommend that space heating is achieved with an ASHP and the DHW requirement be met by an ESP Ecocent unit. PLEASE NOTE that operating conditions, such as ambient air temperature, required water flow temperatures, target room temperatures and humidity will influence the operating efficiency of the unit.

1.1 Features of the Varimax 20 ASHP:

1. Advanced controls All user set parameters can be controlled via A PC based controller that can control several units simultaneously.

2. Appearance The Varimax 20 is designed to be attractive and discrete.

3. Compact design Our Varimax 20 units have a built-in water pump and are stand-alone units (monobloc) to make installation simple and quick.

4. Quiet running

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High quality and efficient compressors, fans, water pumps and sound insulation combine to ensure a very low running noise of 59 dBa.

5. Efficiency The Varimax20 unit is equipped with a highly efficient heat exchanger to deliver exceptional efficiency.

6. Wide operating temperature capability The Varimax I unit is designed to work effectively and efficiently down to -10°C ambient air temperature.

2.0 SAFETY PRECAUTIONS

It is important to take the following precautions when planning your installation, installing and operating the Varimax 20: Failure to observe these

points could lead to loss or damage to property and/or injury/death of installers/operators and will invalidate the warranty.

 The unit must only be installed, moved and/or repaired by a suitably

qualified and experienced engineer. If you are in doubt about who is qualified to carry out such works on the Varimax 20 unit, please call ESP.

 The Unit MUST be properly earthed.  Do not put fingers or other objects into the grill covering the fan and

make sure that children do not play close to the unit. The grills are there for a good reason.

 If you hear abnormal noises, or smell strange odours, coming from

the unit, switch it off immediately and call your installer or ESP.

 Do NOT install the unit close to any gas fired appliance, heater or fire.  Ensure that the base on which the unit is secured is both large and

strong enough to take the weight of the unit comfortably and will not subside. The base should also be at least 150mm above the surrounding ground level and you should check the base periodically to ensure that there is no subsidence of the base or the immediate surrounds. In areas prone to flooding, care should be taken to

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ensure that the unit is elevated to avoid flood damage.

 Ensure that you use a suitably rated circuit breaker. If in doubt, have

your electrician call ESP Technical Support.

 Switch off the power before carrying out any cleaning and/or

maintenance of the unit.

3.0 VARIMAX 20 SPECIFICATIONS

3.1 APPEARANCE

The Varimax 20 is designed to be stylish but unobtrusive. It can be installed with or without the front louvre covering the fans. The cabinet is weather resistant and designed to look good throughout the life of the unit.

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1475

1000

Unit viewed from the top

3.2 Dimensions

4.0 Choosing the right heat pump

4.1 Heat Load Calculation

Based on the local climatic conditions, construction features and insulation levels, your system designer will calculate the heat load of your building and, therefore, the appropriate unit size for your building. ESP can provide a heat load calculation that conforms to MIS 3005. For new builds, meeting the requirements of current building regulations for insulation (or better) will help ensure that the heat load of the dwelling is kept to a minimum. For existing buildings, insulation should be improved as much as possible to minimise the heat load.

4.2 Varimax Output Statistics

The Varimax 20 has been tested according to BS EN 14511, EN 14825 and

12102. Additionally it has been tested in accordance with EU Directive 813/2013 to prove the ErP rating. The choice of ASHP for your purposes

should be based upon the output proven by these tests and the conditions stated in MIS 3005. Performance graphs are included in section 18.

Make sure that your supplier/installer is familiar with the most recent requirements of MIS 3005.

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The Varimax 20 unit is MCS Certified and, if you wish to take advantage of certain funding that may be available, your unit MUST BE INSTALLED BY AN MCS ACCREDITED INSTALLER – please consult your supplier or ESP should you require further clarification.

4.3 Emitter system.

The Heat pump must be matched to a suitable emitter system. The Microgeneration Certification Scheme website offers guidance on pipe spacing for UFH systems together with sizing consideration for fan coil units such as the ESP Thermovec and traditional wet radiators can be found. Please note that, in the case of an UFH system, the floor coverings must be chosen very carefully to ensure that the heat is not ‘trapped’ in the floor by laying the wrong floor covering for the individual room heat load. Again, guidance is available from the MCS website.

5.0 Installation

5.1 Where to use and Where to Site the unit

The Varimax 20 can be used for domestic or commercial premises and consideration should be given to the following when choosing an installation site:

 The unit must be installed in an outdoor location on a solid base that can carry the weight of the unit. This can be on the ground, a roof or balcony. If it is to be installed on a roof or balcony, a steel frame must be used. Please contact ESP for further details.

 The site must be well ventilated but NOT windy.

 The site should be away from sources of high heat.

 The unit must be sited away from any obstacles to the rear and

sides. There must be enough space around the unit for plumbing and maintenance works as detailed in the diagram below. Care should also be given to ensure that any overhead obstacles cannot create a re-circulating air flow (where air exhausted from the ASHP is sucked back in).

 Further information is included in the section below entitled

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“Location of Unit”.

Clearances: A. >500mm B. >1500mm C. > 1000mm D. > 500mm

 The unit generates condensate and this should be piped away from the unit and into a suitable drain to prevent ice forming on the area around the unit. This also applies to the water resulting from a defrost cycle.

 The unit MUST be firmly fixed to a secure base using the rubber anti-vibration feet using suitable fixings. Failure to secure the unit properly using the rubber feet will mean that it will fail MCS Certification and cannot be registered on the MCS database.

 To allow precipitation to run off the unit and to ensure that any water entering the unit can drain through the holes in the bottom of the unit, allow a 3mm fall left to right as you look at the fan.

5.2 Location of the Unit

5.3 Transporting the Unit

When lifting the unit during installation and transportation, an 8 meter strap must be used and the unit protected by soft material placed between the

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lifting strap and the unit to prevent damage. (See picture below).

8m lifting web

Soft Protection

5.4 Plumbing Considerations

When planning the plumbing for the unit, please take the following into account:

 Whenever possible, limit the number of bends in pipework.

 The pipework must be clear and free from debris and blockages.

Pipework should be hot flushed before the unit is connected. Failure to observe this precaution will invalidate the warranty.

 Pipework must be pressure tested for leaks and this must be carried before the unit is connected to avoid damage to the unit. Failure to observe this precaution will invalidate the warranty.

 It is highly recommended that a suitably sized buffer tank be installed between the unit and the heating distribution system. Please consult your installer or ESP when considering this system design point – the right sized buffer tank can make a significant difference to the economy and efficiency of the unit and the heating effectiveness.

6.0 Hydraulic Connection

6.1. Expansion vessels.

An expansion vessel must be installed where the heating system is unvented. The size of the vessel(s) must be determined by the installer on site and take into account the entire volume of water/glycol mix being heated including the volumes contained in the Unit, the buffer tank, the distribution system, emitters and any other system connected to the unit. For this reason, they are not included as part of the optional ASHP installation pack. Expansion vessels can, however, be provided by ESP as an additional optional extra.

6.2 Flow Switch

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The unit is fitted with a water flow switch that will pause the unit operation if

Transit Bung

water flow is not continuous (this includes where there is air in the system). The flow switch is there to protect the unit and the setting should not be altered. If the flow of water is insufficient, an error code will be displayed on the controller.

This will occur on initial start-up if the installer has failed to purge all the air from the system.

6.3 . Flexi Hoses

The final connection to the heat pump flow and return must be made with suitable flexible pipes to prevent vibration in to the system pipework. Please ensure that two wrenches are employed to take up the torque created in tightening the fittings to avoid damage to both the fittings and the heat pump.

These flexible hoses are available from ESP as part of an optional ASHP Installation Pack or individually.

6.4 Automatic bleed valves

Make sure that you fit automatic bleed valves (air vent)s at high points in the system. The unit will shut down if air is in the system because the water flow switch will recognize air in the system as no water flow and a system alarm/protection code will appear on the unit controller.

6.5 Transit Bung

The unit is supplied with a transit bung below the flow/return pipes.

This bung must be removed and replaced with a drain-off- cock (DOC). There must also be a DOC at any lower point in the system, to allow for effective drain-down of the system as and when required. Please note that, if the system is to be left idle for a long period in winter, the system should be drained down. You must fit full flow lever valves on the flow and return to the unit so that the unit can be quickly and effectively drained down where required for maintenance.

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Spirotrap Strainer

6.6 In-Line Filter

You must fit a Y-strainer in-line on the return pipe between

the buffer tank and the ASHP. This is normally fitted in an external location and must have a full flow lever valve side either side of the strainer to minimise glycol loss during maintenance. Due to the mix of metals in the Varimax

it is both advisable and preferable to install a Spirotrap ® rather than the minimum standard Y strainer. Failure to fit a good quality strainer in the return flow to the unit will invalidate the warranty on the unit.

6.7 Flow Setter

ESP Strongly recommend the use of a flow setter in the return pipework from the buffer to the ASHP. This will allow the system flow rate to be optimised for the individual project.

6.8 TRVs

Where Thermostatic Radiator Valves (TRVs) are fitted to radiators in the system, one should NOT be fitted to any radiator in the same room as a room thermostat.

6.9 Distribution Water Pump

If, as advised, you are using a buffer tank in the system, you will need to fit a suitably sized water pump on the water distribution side of the system. This water pump will need to be wired to receive an appropriate signal from the heating system. Because the pump must be sized according to the requirements of the distribution system, this item is not provided by ESP as part of any installation pack but can be provided as an optional extra.

6.10 Glycol

The system must be protected from freezing by using a glycol solution in the water circuits. The glycol/water should be added into the system from the expansion

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tank of the water loop or via the top of the buffer tank. The Glycol must be suitable

% Glycol

10

20

30

40

50

Ambient Temp

-3

-8

-14

-22

-33

Heating Capacity Fluctuation

.991

.982

.972

.961

.946

Power Input Fluctuation

.996

.992

.986

.976

.966

Water Flow Fluctuation

1.013

1.040

1.074

1.121

1.178

Water Drop Fluctuation

1.070

1.129

1.181

1.263

1.308

for the whole system which is why ESP can supply the ideal glycol for the Varimax as an optional extra. The following table details the volume of the glycol/water solution mix:

Note: if the glycol/water mix is too strong, the water flow and water pump will be affected and the efficiency of the unit will be decreased. The above table is for reference only and you should use a glycol/water solution that is suited to local conditions. Using an incompatible Glycol may invalidate your warranty.

7.0 Electrical Connection

7.1 Warning Notes

IMPORTANT! All electrical work MUST be carried out by a suitably qualified electrician. It is not an exaggeration to say that, if you install/connect your unit to a power supply and that installation/connection causes injury to, or death of someone (even years after installation), you may be subject to prosecution under the provisions of criminal law – some of the provisions carry very heavy custodial sentences. IT IS NOT WORTHWHILE RUNNING THIS RISK.

PLEASE GET YOUR UNIT WIRED IN BY A PROFESSIONALLY QUALIFIED ELECTRICIAN TO REMAIN SAFE AND COMPLY WITH THE LAW.

The remained of section 7 is intended as guidance for qualified electricians:

7.2 Before You Start

Before starting to wire in the power supply to the unit, please check that the power supply is suitable for the unit (e.g. single phase, correct size cable, MCB etc. is available) having taken into account the requirements of the entire site. All electricity generating installations that are connected to the grid must be notified to the Distributed Network Operator (DNO). The DNO requirements vary between

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the regions and details of the different Network Operators and you will need to

Typical Isolation Switch

follow the instruction of your local DNO. The unit power specification is stated on a label on the side of the unit. We recommend the use of a dedicated 32 Amp Type C or D MCB for connection of the power supply to the consumer unit.

7.3 MCB

The connection to the electrical consumer unit in the property must comply with current electrical standards and Regulations and be done via a dedicated breaker on the consumer unit that corresponds to the heat pump electrical capacity. Failure to do this correctly can result in fire and/or permanent damage to the unit. If the unit is not appropriately wired in to a suitable supply, the warranty on the unit will be voided.

7.4 Isolation Switch

The heat pump MUST be connected to the power supply through a two port rotary isolation switch that has at least a 3mm contact separation at all poles, fixed in close proximity to the unit and suitably positioned for general and emergency use as required by relevant Regulations. The switch must NOT be attached to the unit itself. The isolation switch must be suitable for the unit electrical duty and comply with applicable Regulations.

7.5 Cable Routing

All wiring should be routed neatly, be kept as far away as possible from the units water pipes and valves and comply with relevant Regulations. High voltage and low voltage wiring should be clearly separated.

The maximum length of cable for the unit controller is 200 metres from the heat pump and in order to get better signal quality over long distances, all the wires should be twisted pair + Shield.

7.6 Wiring-in the Unit

The following points should be noted in relation to power supply wiring and system components:

 Remove the front louvred grill then remove the access panel to access

the electrical connection terminals.

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 The control wire must be passed through the

Mains power Connector Block

Controller Connector

protective wire aperture in the unit casing and plugged into the controller socket.

 The power supply must go through the

protective wire aperture in the unit casing and be connected securely to the terminals in the control box. There is an alternate access grommet in the casing near to the drain-off point.

 In section 13 you will find wiring diagrams for the. Please refer to these

diagrams when introducing power or other wiring into the unit. You should also use these diagrams to check the installation through before starting the unit for the first time.

 If the Building Regulations in your area require a 7-day programmer,

please note that the most efficient way of running an ASHP heating system is to set the programmer to ALWAYS ON. A programmerthat meet current building regulations may be used but it is very IMPORTANT that any signal going back to the heat pump from the heating system thermostat and/or programmer must be VOLT FREE ! The heating system thermostat/ programmer controller is wired to terminals 45&46 inside the heat pump (these connections are not polarized) If you do not use a volt free programmer you WILL damage the ASHP unit.

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Model Designation

PASRW060B-D-BP

Heating Capacity Range

Kw

6.0~15.0

BTU/h

20500~51000

Heating Power Input

Kw

1.6~7.0

Max. Running Power Consumption

A

12.0/12.2

Power Supply

V/Ph/Hz

230/1/50

Number of Compressors

1

Compressor Type

Scroll

Number of Fans

2

Refrigerant

R410a

3.1kg

Compressor Oil

FV50S

1700cc

Fan Power Input

W

110 X 2

Fan Speed

RPM

850

Noise

dB(A)

59

Water Pump Power Input

Kw

.18

Max Water Head

M

12.5

Water Connection

Inch

1 1/4

Water Flow Volume

m3/h

2.5

Terminals 45/46 for volt free connection

Mains power Connection

Socket for Wire Controller

 The unit MUST be connected to the master thermostat within the

building that controls the call for heat. If you do not have a master thermostat connected to the unit from the building, you will not meet Building Regulations.

8.0 Unit Specifications

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Water Pressure Drop

KPa

34

Water Capacity

Ltr

2.44

Unit Dimensions

mm

See Drawings

Unit Shipping Dimensions

mm

1050 X 510 X 1475

Net Weight

Kg

See Unit Label

Shipping Weight

Kg

See Package Label

9.0 Commissioning

9.1 Pre-Start Checks

The following checks must be made prior to starting up the unit for the first time:

 Check that all relevant lever valves are open.  Check the water loop and expansion tank to ensure that both have

adequate water in them to allow the system to operate at 1 – 1.5 bar.

 Ensure that all air has been purged from the system.  Ensure that pipes are well insulated using waterproof lagging, with at

least 30mm wall thickness. Check the electrical wiring is correct in every respect. In particular,



make sure that the system is properly earthed. Inspect the heat pump to ensure that all the cover screws have been



replaced and secured properly.

 Check that the fan rotates freely.  When you switch on the power to the unit at the rotary isolation

switch, check the controller on the unit casing to see if there is an error code being displayed.

9.2 Switching on the Unit

 Please familiarise yourself with the unit controller and the

instructions in section 10 so that you can check various parameters as the unit starts.

 Start the heat pump by pressing the key on the unit controller

(see section 10). This will start the water pump. Check that the water pump is running - there should be a reading of 0.2 MPa on the

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water pressure gauge. When the water pump has been running for 1 minute, the



compressor will start up. Make sure that there are no strange noises coming from it

immediately and check the compressor. If the compressor runs well please check the pressure of the refrigerant.

 Following the above, check whether the power input and running

current being drawn by the unit is in line with this manual. If not please stop the unit and check for any problems.

 If the unit is supplying a heating manifold, adjust the actuators on the

manifold(s) to balance the heating being received in all areas of the system.

 Check that the outlet water temperature is stable and increasing

smoothly towards the target temperature. The return water temperature should move in line with the flow temperature with around a 4 deg C. difference between the flow and return water temperatures.

 The parameters of the unit controller are factory set and you must

not change them without consulting your installer or ESP. The exceptions to this are the running temperature (or flow temperature) of the system and the time. However, changing the flow temperature will affect the efficiency of your system and may affect your ability to claim/continue to claim any Government grant. Section 10 explains how to view the various parameters although the default view will show the current status of the system.

. If the compressor sounds abnormal, stop the unit

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10.0 Unit Controller

Icon

Key

Meaning

Cooling Mode

Indicates that the unit is in cooling mode.

Heating Mode

Indicates that the unit is in Heating mode.

Boost Mode

Indicates that the unit is in Boosted Heating mode.

Hot Water Mode

Indicates that the unit is in Hot Water mode.

Number

Icon

Key

Function

①

On-Off

This is a multi-function button used to start the units, turn it off, cancel a current operation and to return to the previous menu page.

②

Time

Used to set the time and the optional timers.

③

Timers

Used to set the optional timers.

④

Check

To check current load (power) and temperatures.

⑤

Setting

Used to set various functions.

⑥

Up

Used to move ‘up’ in menus and to increase values.

⑦

Down

Used to move ‘down’ in menus and to decrease values.

⑧

Modes

Used to change between modes.

10.1 Main Interface

10.2 Basic operation

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Defrost Mode

Indicates that the unit is defrosting.

Inlet temperature

Indicates that the inlet temperature is being displayed.

Outlet Temperature

Indicates that the outlet temperature is being displayed.

Setting Mode

Indicates that the control is in setting mode.

Value

Indicates that the basic display area is displaying a parameter value.

Parameters

Indicates that the auxiliary display area is displaying a parameter category.

Degrees Centigrade

Indicates that a value displayed in the basic or auxiliary area is a temperature.

Kilowatts

Indicates that a value displayed in the auxiliary area is a power value.

Hour

Indicates that the basic display area is displaying an hour value.

Minute

Indicates that the basic display area is displaying a minute value.

Second

Indicates that the basic display area is displaying a second value.

Cubic Meters Per Hour

Indicates that the basic display area is displaying a flow rate.

Bars

Indicates that the basic display area is displaying a pressure value.

Compressor

Indicates that the compressor is running.

Pump

Indicates that the pump is running.

Fan

Indicates that the fans are running.

Lock

Indicates that the control pad is locked.

Fault

Indicates that a fault has been detected.

Start Time

The start time in timer mode (timer 2 illustrated)

Finish Time

The finish time in timer mode (timer 1 illustrated)

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10.3 Start-up and Shut Down

When the unit is in stand-by mode or has automatically gone ‘blank’, the screen is activated by pressing the on-off button.

When the unit is in stand-by mode, press the on-off key and hold it for 0.5 seconds to start the unit. When the unit is running, pressing (and holding) the same button for the same time will put the unit into stand-by mode.

When running, the display will show the inlet temperature and the outlet temperature

NB. The screen will return to blank automatically.

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10.4 Setting the target temperature

This symbol indicates that the unit is in heating mode

Press the up button once will show the target temperature as set.

Symbol indicates that the target temperature can be set Current Target Temperature

Pressing the up arrow will increase the target temperature, the down arrow will decrease the target temperature. Press the key to save the setting or the to cancel the change. If no key is pressed within 20

seconds, the new setting will automatically be saved.

N.B. Your installer will have set the target temperature to optimise the flow temperature for your building. Changing this setting from the recommended temperature will decrease the efficiency of your system. If you are considering changing this setting from that set by your installer, you should consult your installer or the ESP Technical Team first.

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10.5 Using the Premium User Interface The Premium User Interface is used to change the time, set (or

change) timers, change from a Centigrade to a Fahrenheit display, mute the interface and check the status of the ASHP.

Pressing the set button to change to the Premium User Interface. If the on-off button is pressed or no button is pressed within 20 seconds, the display will revert to the start screen.

The Premium User Interface has three additional buttons on the left hand side of the display.

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10.6 Setting the time:

Minute Segment

The display will change and using the up and down buttons will change the ‘hours’ setting. Press the set key to save the change.

First, press the time button.

Use the up and down buttons to change the

‘minutes’ segment of the

clock. Press the set key to save the change.

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Timer time

N.B. pressing the on-off button at any stage will cancel the changes to that stage or not pressing a button within 20 seconds will save any changes made.

10.7 Setting the timers The ASHP can be set to come on and go off again for two

periods per day. However, the most efficient way to run

an ASHP is to leave the unit running ‘always on’ and not to

set the timers.

Should you wish to set the timers against this advice, the procedure is as follows:

Press and hold the time button for 2 seconds.

The display will change and the ‘on’ time of ‘timer 1’ can be set using

the up and down arrows to set the

hour. Press set to save the ‘hour’ and move to ‘minutes’. Us the up

and down arrows to set the minutes

then press set again to save the minutes. The display will

automatically move to ‘timer 1 off’. Use the same method to set the desired ‘off’ time. At the end of that process, the display will change to ‘timer 2 on’ and once that has been

set, ‘timer 2 off’.

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‘On 1’ time will flash

‘On 1’ time will stop flashing

Timer has been cancelled

10.8 Cancelling timers

To cancel a timer, enter the Premium User Interface then press the time button for 2 seconds. This will display the

current ‘Timer 1 on’ setting and

the time will flash. Press the set button and the

Pressing the set button will stop the time flashing.

Pressing the on-off button at this stage will cancel the timer. Press the on-off button once more to return to the premium user interface.

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Parameter Value

Parameter Number

10.9 Checking the Status of the ASHP

To Check the status of a parameter, press the check button whilst in the Premium User Interface.

The display will change to parameter 1. The

parameter value, the ‘val’

symbol, the parameter

number and ‘param’

symbols will be displayed.

Press the up and down arrows to toggle through the parameter list and the on-off button to return to the Premium User Interface. The complete list of parameters is in section 18

for information only; changing any parameter other than the time/timers could invalidate the warranty, the MCS registration and any Government grants claimed.

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Indicates that the display is locked

Fault Code

Serial Number

Number of faults reported

10.10 Locking the Display To lock the display, simply

press and hold the on/off button for 5 seconds.

The ‘lock’ symbol will appear.

To unlock the display, press and hold the on-off button for 5 seconds. However, the display will automatically unlock if the unit restarts after a power failure or if a fault is reported.

10.11 Fault Displays

Should the ASHP develop a fault, a fault code will be displayed in the following format:

The fault code will be displayed, together with the number of faults reported and the serial number of the fault. Use the up and down arrows to scroll through reported faults. A table of fault and meanings is in section 12.1.

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11 Maintenance

11.1 Essential Checks

Periodically clean the in-line filter (Y strainer or Spirotrap); this will need to be every month for the first 6 months following start up of the system to allow installation debris to be extracted. NOTE that a lack of water in the system or debris/dirt entering the system can damage the unit.

11.2 Advisory Checks

Although there is no formal requirement for annual maintenance of the unit, the following checks are strongly suggested:

Check the grill and evaporator for debris and remove before cleaning the evaporator.

Check the water supply and air vents frequently, to ensure that there is adequate water within the system and that air is kept out of the system.

Check each part of the unit and the pressure within the system.

If any component has failed, replace it (and recharge refrigerant, if any has been lost).

Check over the power supply and the electrical system generally to make sure that no wires are lose or degrading. You must investigate any scorching visible or unusual smells coming from the unit or the wiring.

Replace any part that may be malfunctioning; it is better to replace a part early (to practice good preventative maintenance) than await failure.

If the heat pump is not to be used for a long period of time, please drain it down and seal the unit to keep it safe for recharging and restarting when needed.

If a period of non use will include any possibility of the unit freezing, isolate the unit and drain the water from the lowest point of the heat exchanger. Recharge the water/glycol and carry out a full inspection of the unit before it is restarted.

 The water loop of the heat pump MUST be protected from freezing in winter.

Please NOTE THE FOLLOWING – failure to observe the following requirements WILL invalid the warranty for the heat pump.

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Please do not shut off the power supply to the heat pump in winter unless

Code

Malfunction

Reason

Resolution

P01

Inlet probe error

Short-circuit/Open-circuit

Check and change the temp.

Sensor

P02

outlet probe error

Short-circuit/Open-circuit

Check and change

the

temp.

Sensor

P04

Ambient probe error

Short-circuit/Open-circuit

Check and change the temp.

Sensor

P07

Suct. temp. prb. Error

Short-circuit/Open-circuit

Check and change

the

temp.

Sensor

P08

Disc. temp. prb. Error

Short-circuit/Open-circuit

Check and change

the

temp.

Sensor

PP1

Disc. press prb. Error

Short-circuit/Open-circuit

Check and change the sensor

PP2

Suct. press prb. error

Short-circuit/Open-circuit

Check and change the sensor

E01

High pressure

High pressure switch off

Check cooling system and pressure switch

E02

Low pressure

Low pressure switch off

Check cooling system and pressure switch

E03

Flow switch alarm

No water or little water

Check water flow and water pump

E07

Freeze alarm

Inadequate water

Check water flow and clear blockages

E19

Freeze alarm1

Low environment temp.

E29

Freeze alarm2

Low environment temp.

P181

High disc. temp

Overload of compressor

Check compressor

E21

Inv. Input Lessvolt.

Low voltage leads the overlarge current

Check the input voltage

E22

Inv. Input Overvolt

Input current over protection current

Check input current

it is to be drained-down. When the air temperature is below 0°C, if the inlet water temperature is above 2°C and below 4°c, the water pump will start automatically once in every 72 hrs to provide frost protection.

12.0 Troubleshooting

12.1 Error Codes:

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E23

Input Over Cur. War n

Input current over protection current

Check input current

E24

Inv. DC Overvoltage

DC bus voltage >DC protection bus volt

Check bus

voltage

E25

Inv. DC Lessvoltage

DC bus voltage<DC protection bus volt

Check bus

voltage

E27

IPM Overcurrent

Overlarge current of the IPM

Check current

E28

IPM Overheating

Over Temp. of the IP M Module

Check current

E29

Inv. Temp. Probe Fail

Short-circuit or ope n circuit of sensor

Check and change the sensor

E30

Inv. Input Overvolt

Over Temp. of the parts

Lower the temperature and check

E31

Input Over Cur. War n

Over Temp. of the parts

Lower the temperature and check

E32

IPM Sampling Cur

Fault of current sampling

E33

Comp. Overcurrent

Overlarge current of compressor

Check the current

E34

Comp. Over Cur. War n

Overlarge current of compressor

Check the current

E35

Inv. Input Out Phase

Lack of phase in input voltage

Check the voltage

E36

Comp. Driver Failure

Lack of phase or breakdown of driver

Check the voltage

E37

Comm. Err DSPMCU

Fault of DSP or communication board

Check communication connection

E38

Comm. Err DSPPFC

Fault of DSP and PFC

Check communication connection

E39

Inv. Sampling Volt

Fault of current sampling

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E40

EEPROM Error Warn

Chip error

Check and change the chip

E41

Weak Magnetic Warn

Comm

Weak Magnetic

Problem

Possible Causes

ESP Varimax 20 ASHP Installation And Operation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual