WarmFlow G Series User manual

High Efficiency
Variable Speed
Ground Source Heat Pumps
Models covered by this manual:
G-Series
Ground Source GS08 GS16
Incorporating: User Instructions
Installation Instructions
Service Instructions
Guarantee Terms & Conditions

INSTALLATION, COMMISSIONING & SERVICING
This appliance must be installed as described herein and the installation commissioned by
competent persons as instructed. The Installation/Commissioning Certificate supplied with the
product must be completed and returned to the manufacturer with proof of purchase (e.g.
receipts / invoices).
This appliance must be serviced annually by competent persons, the Service Record completed
on each occasion and proof of servicing (e.g. receipts / invoices) retained.
The complete guarantee policy statement is included in Section 4.
FAILURE TO COMMISSION, REGISTER AND ANNUALLY SERVICE THIS
PRODUCT WILL INVALIDATE ALL GUARANTEES
TECHNICAL, SPARES & GUARANTEE CLAIMS
For technical advice about the installation, commissioning, servicing or use of this appliance,
please contact the Warmflow Customer Care Centre by post, phone, fax or email at the
addresses below. Please also refer to our website.
In the unlikely event that replacement components might be required within the guarantee
period, please notify the Customer Care Centre in writing, by post, fax or email, stating the
nature of the fault and the part number of the replacement components required.
Warmflow Customer Care Centre
Warmflow Engineering
Lissue Industrial Estate
Moira Road
Lisburn
BT28 2RF
Northern Ireland
Telephone
United Kingdom: 028 9262 1515
Republic of Ireland: 048 9262 1515
Facsimile
United Kingdom: 028 9262 0869
Republic of Ireland: 048 9262 0869
Email
[email protected]
Website
www.warmflow.co.uk

Page 1
CONTENTS
Contents ......................................................................................................................................................................1
1USER INSTRUCTIONS........................................................................................................................................3
1.1 Intended Use.................................................................................................................................................................3
1.2 Compliances .................................................................................................................................................................3
1.3 Basic Operation.............................................................................................................................................................3
1.4 Product Data .................................................................................................................................................................4
1.4.1 Starting Current.....................................................................................................................................6
1.5 Construction..................................................................................................................................................................6
1.6 Supplied Components...................................................................................................................................................7
1.7 Storage / Transport .......................................................................................................................................................7
2USER INTERFACE..............................................................................................................................................8
2.1 Home Screen Icons.......................................................................................................................................................8
2.2 Using the Main Menu ....................................................................................................................................................9
2.3 Selecting the Home Menu...........................................................................................................................................10
2.4 Selecting the Alarms Menu .........................................................................................................................................10
2.5 Selecting the Functions Menu.....................................................................................................................................10
2.6 Selecting the Settings Menu........................................................................................................................................11
2.6.1 Date / Time: ........................................................................................................................................12
2.6.2 Scheduler:...........................................................................................................................................12
2.6.3 Temperature: ......................................................................................................................................13
2.6.4 Information:.........................................................................................................................................15
2.7 Selecting the Engineer Menu ......................................................................................................................................17
2.7.1 Parameters: ........................................................................................................................................18
2.7.2 Commissioning: ..................................................................................................................................20
2.7.3 Servicing: ............................................................................................................................................21
2.7.4 Service Now:.......................................................................................................................................25
2.7.5 History:................................................................................................................................................25
2.7.6 In/Out: .................................................................................................................................................25
2.8 Selecting the Help Menu.............................................................................................................................................27
3GROUND SOURCE HEAT PUMP INSTALLATION .........................................................................................28
3.1 General .......................................................................................................................................................................28
3.2 Unpacking...................................................................................................................................................................30
3.3 Ground Collector Installation.......................................................................................................................................30
3.3.1 Brine....................................................................................................................................................30
3.3.2 Brine Connections to the Heat Pump .................................................................................................30
3.3.3 Ground Loop Sizing & Integrated Circulator.......................................................................................30
3.3.4 Borehole Sizing...................................................................................................................................31
3.3.5 Brine Pump Overrun...........................................................................................................................32
3.3.6 Brine Circuit Line Components...........................................................................................................32
3.3.7 Brine Circuit Expansion Vessel...........................................................................................................33
3.3.8 Filling the Brine Circuit........................................................................................................................33
3.4 Heating Circuit Connection..........................................................................................................................................33
3.4.1 Heating Medium..................................................................................................................................33
3.4.2 Heating Connections to the Heat Pump .............................................................................................34
3.4.3 Heating Circuit and Integrated Circulator............................................................................................34

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3.4.4 Heating Pump Overrun.......................................................................................................................34
3.4.5 Bypass / Open Zones .........................................................................................................................34
3.4.6 Freeze Protection................................................................................................................................34
3.4.7 Heating Circuit Line Components.......................................................................................................34
3.4.8 3-port Motorised Valve Installation .....................................................................................................36
3.4.9 Heating Expansion Vessel (Integral) ..................................................................................................37
3.5 Drain Pipe & Pressure Relief Valve.............................................................................................................................37
3.6 Electrical Installation....................................................................................................................................................38
3.6.1 Incoming Supply .................................................................................................................................41
3.6.2 Fuses ..................................................................................................................................................41
3.6.3 Power Out...........................................................................................................................................41
3.6.4 Digital Outputs ....................................................................................................................................41
3.6.5 Temperature Sensors .........................................................................................................................45
3.6.6 Digital Inputs .......................................................................................................................................45
3.6.7 pLAN...................................................................................................................................................46
3.7 Commissioning............................................................................................................................................................48
3.7.1 Recorded Details ................................................................................................................................48
3.7.2 Testing Flow Rates.............................................................................................................................48
3.7.3 Probe Adjustment ...............................................................................................................................49
3.7.4 Unit Control.........................................................................................................................................50
3.7.5 Weather Compensation Mode............................................................................................................50
3.7.6 DHW Cylinder Heat Up Test...............................................................................................................51
3.7.7 Digital Outputs ....................................................................................................................................51
3.7.8 Sign Off...............................................................................................................................................51
3.8 System Hand Over......................................................................................................................................................51
3.9 Servicing .....................................................................................................................................................................52
3.9.1 Servicing Schedule.............................................................................................................................52
3.10 Alarms and Troubleshooting .......................................................................................................................................54
3.11 Alarms.........................................................................................................................................................................54
3.12 Troubleshooting...........................................................................................................................................................60
4YOUR GUARANTEES, TERMS & CONDITIONS.............................................................................................61
4.1 Period of Guarantee....................................................................................................................................................61
4.2 Warmflow’s Obligations...............................................................................................................................................61
4.3 Your Obligations..........................................................................................................................................................61
4.4 Exclusions of Guarantee .............................................................................................................................................62
4.4.1 Repairs................................................................................................................................................62
4.4.2 Other property.....................................................................................................................................62
4.4.3 General ...............................................................................................................................................62
5APPLIANCE INSTALLATION/COMMISSIONING CERTIFICATE & REGISTRATION. ..................................66
6APPLIANCE SERVICE RECORDS...................................................................................................................69

Page 3
1 USER INSTRUCTIONS
1.1 Intended Use
The Warmflow Ground source heat-pump units are intended for the production of hot water for
space heating and sanitary water. The units can be used to provide heating and domestic hot
water (DHW) via underfloor heating circuits, radiators and approved hot water cylinders. The
units are designed to extract heat from the ground using a horizontal ground collector or a
vertical borehole collector. For connection to a water source please contact Warmflow for
further details.
1.2 Compliances
The Warmflow GS08 and GS16 ground source heat pump units are Microgeneration
Certification Scheme (MCS) approved and CE marked. They are approved on the Renewable
Heat Incentive Eligibility list and can be found on both the Product Characteristics Database
(PCDB) as well as the Home-heating Appliance Register of Performance (HARP) database. As
such the units comply with the following directives and are tested to the following standards:
MCS 007 Issue 3.0 - Product Certification Scheme Requirements: Heat Pumps.
2006/95/EC - Low Voltage Directive.
2004/108/EC - Electromagnetic Compatibility Directive.
97/23/EC - Pressure Equipment Directive.
EN 14511 - Air conditioners, liquid chilling packages and heat pumps with electrically
driven compressors for space heating and cooling.
EN 60335-1 - Household and similar electrical appliances. Safety. General requirements.
EN 60335-2-40 - Household and similar electrical appliances. Safety. Particular
requirements for electrical heat pumps, air-conditioners and dehumidifiers.
EN 378 - Refrigerating systems and heat pumps. Safety and environmental
requirements.
1.3 Basic Operation
Heat flows from an area of higher temperature to an area of lower temperature. In much the
same way that a water pump, pumps water from a low level to a higher level, a heat pump
pumps heat from a source at a low temperature to a source at a higher temperature. The
benefit of this is that natural sources such as the air and ground, which are at relatively low
temperatures, can be used to heat buildings at a higher temperature. In order to do this the
heat pump uses a relatively small amount of electrical energy. The proportion of electrical
energy is much smaller than the heat power delivered to the building. The ratio of the heat
power delivered to the electrical energy used determines the efficiency of the heat pump and is
commonly known as the coefficient of performance (COP).
Figure 1 Basic Operating Principles of a Heat-pump

Page 4
Heat is extracted from the ground by pumping brine around a horizontal surface collector or
vertical borehole collector. Brine is a mixture of water and anti-freeze (mono ethylene glycol), to
allow operation in sub-zero temperatures. This collected heat is then transferred into the heat
pump’s refrigerant via a heat exchanger known as the evaporator. The heat pump then
converts this low grade heat to a high grade by compressing the refrigerant using the
compressor. The compression of the refrigerant increases the pressure and the temperature.
This high grade heat is then transferred to the heating system via another heat exchanger
known as the condenser. The heat can now be used to provide space heating and DHW. The
pressure of the refrigerant is then released through a throttling valve known as the expansion
valve which also causes the temperature to drop and allows the cycle to start over again.
1.4 Product Data Table 1Product data
Product Data
GS08
GS16
Dimensions
(mm)
Width
590
590
Depth
660
660
Height
890
890
Weight (kg)
125
130
Electrical Supply
230V Single Phase
@50Hz
230V Single Phase
@50Hz
Maximum Current (Amps)
30
40
Nominal Sound Level (dBA)*
58
55
Performance
COP @ B0W35^
4.41 @ 7.59kW
5.08 @ 11.63kW
COP @ B5W35^
4.95 @ 8.44kW
5.64 @ 12.82kW
COP @ B0W45^
3.63 @ 7.72kW
4.10 @ 12.00kW
COP @ B0W55^
3.00 @ 7.91kW
3.34 @ 12.32kW
COP @ B0W65^
2.29 @ 8.13kW
2.72 @ 12.59kW
Heat Output Range
2.5-8kW
4.5-18kW
ErP Efficiency Class
(35°C / 55°C)^
A++ / A++
A++ / A++
Flow Temp. (◦C)
Brine, min/max
-5/15
-5/15
Heating, min/max
30/65
30/65
Flow Rates (l/m)
Brine, min/max
10/45
10/75
Heating, min/max
8/34
8/60
Refrigerant
Type
R410A
R410A
Charge (kg)
2.60
3.10
Compressor Oil
Type
RL32 3MAF
RL32 3MAF
Quantity (l)
1.5
1.5
Connections
Brine
1 ½” female BSP
1 ½” female BSP
Heating
1 ¼” female BSP
1 ¼” female BSP
*Nominal Sound Levels have been independently tested in accordance with EN 12102.
^COP and Heat Power ratings have been independently tested in accordance with EN 14511.

Page 5
Table 2Product information
Model
GS08
GS16
Air-to-water heat pump
No
Water-to-water heat pump
No
Brine-to-water heat pump
Yes
Low-temperature heat pump
No
Equipped with a supplementary heater
No
Heat pump combination heater
No
Symbol
Value
Unit
Rated heat output
Prated
8
12
kW
Declared Capacity for heating for part load at indoor temperature 20°C and outdoor
temperature Tj
Tj= -7°C
Pdh
7.3
9.1
kW
Tj= 2°C
Pdh
4.4
6.1
kW
Tj= 7°C
Pdh
2.7
11.4
kW
Tj= 12°C
Pdh
8.2
11.4
kW
Tj= bivalent temperature
Pdh
2.7
6.1
kW
Tj= operation limit temperature
Pdh
8.2
11.6
kW
Bivalent temperature
Tbiv
7.0
2.0
°C
Cycling interval capacity for heating
Pcych
-
-
kW
Degradation coefficient
Cdh
-
-
Seasonal Space Heating Energy Efficiency
ηs
146
155
%
Tj= -7°C
COPd
4.09
4.26
Tj= 2°C
COPd
4.56
4.83
Tj= 7°C
COPd
4.75
4.34
Tj= 12°C
COPd
3.48
3.45
Tj= bivalent temperature
COPd
4.75
4.83
Tj= operation limit temperature
COPd
3.85
4.06
Operation limit temperature
TOL
-15
-15
°C
Cycling interval capacity for heating
COPcyc
-
-
Heating water operating limit temperature
WTOL
60
60
°C
Power consumption in modes other than active
Off mode
POFF
0.008
0.008
kW
Thermostat-off mode
PTO
0.024
0.019
kW
Standby mode
PSB
0.016
0.020
kW
Crankcase heater mode
PCK
0.016
0.016
kW
Other items
Capacity control
Variable
Sound power level indoors
LWA
58
55
dB
Annual energy consumption
QHE
4514
5991
kWh
Rated brine flow rate
QHE
3
5
m3/h

Page 6
Table 3Product Fiche
Supplier
Warmflow
Warmflow
Model
GS08
GS16
Energy Efficiency Class
A++
A++
Rated Heat Output (kW)
8
12
Seasonal Space Heating Energy Efficiency
176
192
Annual Energy Consumption, GCV (kWh)
3706
4777
Sound Power Level, LWA (dB)
58
58
Rated Heat Output in Colder Climate (kW)
8
12
Seasonal Space Heating Energy Efficiency in Colder Climate
176
192
Annual Energy Consumption in Colder Climate, GCV (kWh)
4422
5700
Rated Heat Output in Warmer Climate (kW)
8
12
Seasonal Space Heating Energy Efficiency in Warmer Climate
176
192
Annual Energy Consumption in Warmer Climate, GCV (kWh)
2397
3089
1.4.1 Starting Current
The GS08 and GS16 ground source heat pump units are both inverter driven. This means they
ramp up slowly and therefore do not require a large starting current which is required in fixed
speed units. In the majority of situations the starting current will be less than 5Amps. The
starting current will also be below the rated current of the unit.
1.5 Construction
The Warmflow ground source heat pumps are housed in a pre-coated metal casing complete
with plastic dresser upon which the user interface is mounted. Both models are supplied in the
same size of outer casing although internal components differ significantly.
Figure 2 Main Components
User Interface
Expansion Valves
Brine Circulating
Pump
Heating
Circulating Pump
Compressor
Expansion Vessel
c/w Pressure Gauge

Page 7
Upon delivery, it is important that the unit is unpacked carefully and checked for any sign of
damage. If something is missing or damaged please report it to Warmflow immediately. The
units are secured to the shipping pallet using screws which must be removed.
1.6 Supplied Components
Together with the unit, a number of additional components are supplied to aid installation. The
following items are supplied with each unit:
Low restriction 3-port motorised valve
1¼” BSP Y-strainer complete with 700μm filter gauze
1½” BSP Y-strainer complete with 700μm filter gauze
2no. 1¼” BSP flexible hoses
2no. 1½” BSP flexible hoses
External temperature sensor complete with weather protected enclosure
DHW cylinder temperature sensor
Upon delivery, it is important to check that all components are included. If something is missing
or damaged please report it to Warmflow immediately.
1.7 Storage / Transport
The units come on a small pallet measuring 800mm by 670mm and are secured to the pallet
using screws. If the units are to be stored prior to installation, they must be kept indoors in
storage conditions at a temperature of between 5°C and 60°C with a humidity level between
10%RH and 80%RH in order to provide a non-condensing environment. The units must not be
stacked in storage or during transport. During transport the units must be kept in an upright
position and should never be allowed to tilt more than 45° during loading or unloading.

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2 USER INTERFACE
The appliance’s user control interface (see Figure 3) has been designed to maximise the ease
of use and efficiency of the heating system.
Figure 3 User Interface Display and Function Keys
2.1 Home Screen Icons
All interactions with the heat pump are via the control panel located on the front of the heat
pump. The interface allows the modification of parameters such as time clocks, temperature set
points, heating & DHW functions, together with commissioning and service settings. The home
screen appears as shown in Figure 4.
Figure 4 Icon Descriptions
Unit Status
Icon
Status
Meaning
Unit OK
The appliance is functioning normally. There are no faults or alerts. Servicing is not due.
Unit Alert
The appliance has reached alert condition but will continue to operate as normal. This alert
means that servicing is now due. The servicing time limit can be seen by pressing the
‘Display active alarms’ key. You should arrange servicing as soon as possible and before
servicing is overdue otherwise the appliance will shut down.
Unit Fault
The appliance has shut down due to a fault or alarm. This may be a fault with the appliance
or an overdue service. The fault or alarm can be viewed by pressing the ‘Display active
alarms’ key.
Display active alarms
Select main menu
Previous menu
Select UP
Select DOWN
Enter / select
Heating Status
Unit Status
Current Page
Hot Water Status

Page 9
Heating Status
Icon
Status
Meaning
Heating ON
The unit is in heating mode. Heating mode has been enabled by a signal from the internal
timeclock, from a remote digital input or by the frost protection function.
Heating
OFF
The unit is not in heating mode. A signal has not been received to enable heating mode.
Hot Water Status
Icon
Status
Meaning
Hot Water
ON
The unit is in hot water mode. Heating mode has been enabled by a signal from the internal
timeclock or from a remote digital input.
Hot Water
OFF
The unit is not in hot water mode. A signal has not been received to enable hot water mode.
2.2 Using the Main Menu
The main menu can be accessed by pressing once on the ‘Program key’. This displays the
main menu as shown in Figure 5 and Figure 6 below.
Figure 5 Main Menu Page 1
Figure 6 Main Menu Page 2
The ‘Down Arrow’ or the ‘Up Arrow’ key can then be used to scroll through the menu.
Confirm selection with the ‘Enter key’ when the required item is highlighted in black. There
are six options in the main menu including ‘Home’, ‘Alarms’, ‘Functions’, ‘Settings’, ‘Engineer’
and ‘Help’.

Page 10
2.3 Selecting the Home Menu
Home:
Selecting the home menu returns the display to the home screen. This display is as shown in
Figure 7 and detailed in section 2.1.
Figure 7 Home Screen
2.4 Selecting the Alarms Menu
Alarms:
Selecting the alarms menu enters the alarms display. This can also be entered at any time by
pressing the ‘Display active alarms’ key. The screen shown in Figure 8 will be displayed
when no alarms are present.
Figure 8 Alarms Screen
When an alarm is present, the ‘Display active alarms’ key will flash red. Pressing the
flashing key or entering the alarm menu will then display one or more active alarms or faults.
The ‘Down Arrow’ or the ‘Up Arrow’ key can then be used to scroll through the alarms.
Refer to Section 3.11 for more information on the alarm messages that can be displayed and
the appropriate action to take in each case.
2.5 Selecting the Functions Menu
Functions:
Selecting the functions menu enters the main unit control page. This page is used to control
how the unit is operated for both heating and hot water modes. Pressing the ‘Enter key’
repeatedly will cycle through the menu options, at each option its status can be changed by
using the ‘Down Arrow’ or the ‘Up Arrow’ key and confirmed with the ‘Enter key’.
Figure 9 Functions Screen
Master ON / OFF
control
ON / OFF control
for hot water
Boost control
for heating

Page 11
Press the ‘Enter key’ to select the master ON / OFF control use the ‘Down Arrow’ or the
‘Up Arrow’ key to change its status to ON and confirm with the ‘Enter key’.
The control for both the heating and hot water can be manually controlled here. There are four
options to choose from in each field including OFF, ON, TIMER and ECO. If the unit is to be
controlled by remote digital inputs, the control for both heating and hot water should be set to
OFF with the master control set to ON as is shown in Figure 9. When the remote digital inputs
are activated, this will automatically change to ON and revert to OFF when the remote digital
inputs are deactivated.
In the default control mode, the unit is controlled by the internal time clocks built into the
controller. To enable this, both the heating and hot water should be set to TIMER with the
master control set to ON as shown in Figure 10 below.
Figure 10 Functions Screen with Timers Enabled
The ON and ECO setting will run the unit manually at the normal operating temperature and the
economy operating temperature respectfully. These will stay enabled until these setting are
changed.
The ‘Boost’ functionality enables the user to switch on either heating or hot water for a period of
1 hour, 2 hours or 3 hours. This turns the selected function on and triggers the heat pump to
target the current set points for the relevant function. Once the boost period has elapsed, the
unit will automatically revert to standby mode.
Press the ‘Enter key’ to select the Boost control, use the ‘Down Arrow’ or the ‘Up Arrow’
key to change its status from OFF to 1 hour, 2 hours or 3 hours and confirm with the ‘Enter
key’.
2.6 Selecting the Settings Menu
Settings:
Selecting the settings menu enters a sub-menu which has a number of information and setting
screens. These can be viewed and adjusted by the user. The information and setting screens
are displayed in the same format as the main menu screen and may be accessed in the same
way. The sub-menus include Date/Time, Scheduler, Temperature and Information as shown in
Figure 11 and Figure 12 below.
Figure 11 Settings Menu Page 1

Page 12
Figure 12 Settings Menu Page 2
2.6.1 Date / Time:
Selecting the date/time sub-menu enters the appliance clock and date management system. It
is very important that the date and time are set correctly as shown in Figure 13.
Figure 13 Date / Time Screen
Press the ‘Enter key’ to select the required menu item. The date and time can then be
adjusted using the ‘Down Arrow’ or the ‘Up Arrow’ keys. Confirm with the ‘Enter key’.
The day will automatically update when the date is altered.
2.6.2 Scheduler:
Selecting the scheduler sub-menu enters the appliance’s internal timeclocks. This allows the on
and off times for the heating, hot water and thermal disinfection (if required) to be set. The
scheduler sub-menu also has a screen for enabling/disabling and adjusting the daylight saving
time function.
The first screen is for setting the heating timeclock. The timeclock can have unique programs
for each day or you can use the ‘copy to:’ function to use the same settings for each day. Up to
four time settings can be used per day and for each of these time settings, the appliance can be
set to ON, Energy save or OFF.
Press the ‘Enter key’ to select the parameter you wish to modify and then use the ‘Down
Arrow’ or the ‘Up Arrow’ key to change its status. Confirm with the ‘Enter key’.
Figure 14 Heating Scheduler Screen
The second screen is for setting the hot water timeclock. The timeclock can have unique
programs for each day or you can use the ‘copy to:’ function to use the same settings for a
number of days. Up to four time settings can be used per day and each of these time settings
the appliance can beset to ON, Energy save or OFF.

Page 13
Press the ‘Enter key’ to select the parameter you wish to modify and then use the ‘Down
Arrow’ or the ‘Up Arrow’ key to change its status. Confirm with the ‘Enter key’.
Figure 15 Hot Water Scheduler Screen
The third screen is for setting the thermal disinfection timeclock. The commissioning engineer
will decide if thermal disinfection is required based on the heat up performance of the hot water
cylinder. The timeclock can have unique programs for each day or you can use the ‘copy to:’
function to use the same settings for each day. It is recommended to carry out thermal
disinfection at least once per week. Up to four time settings can be used per day and each of
these time settings the appliance can be set to ON or OFF.
Press the ‘Enter key’ to select the parameter you wish to modify and then use the ‘Down
Arrow’ or the ‘Up Arrow’ key to change its status. Confirm with the ‘Enter key’.
Figure 16 Thermal Disinfection Scheduler Screen
The fourth screen is for enabling/disabling and adjusting the daylight saving time function. The
default setting is for daylight saving time to be enabled based on the GMT time zone. However,
it is possible to disable or modify this functionality.
Press the ‘Enter key’ to select the parameter you wish to modify and then use the ‘Down
Arrow’ or the ‘Up Arrow’ key to change its status. Confirm with the ‘Enter key’.
Figure 17 Daylight Saving Time Screen
2.6.3 Temperature:
Selecting the temperature sub-menu enters two screens from which the appliances heating flow
temperature and hot water storage temperature may be adjusted. There are two setting for
each and these include ‘Normal’ and ‘Energy Save’. These allow the temperatures to be set
independently for varying times in the day. This feature can be used to run the unit at higher

Page 14
temperatures when electricity is available from a renewable source such as photovoltaic solar
panels or a wind turbine and also when electricity is cheaper from the grid such as using an
Economy 7 tariff.
The first page contains the heating flow temperature setpoints.
Figure 18 Heating Flow Temperature Setpoints Screen
The heating flow temperature is the temperature at which the heating system water leaves the
appliance and enters the central heating circuit. This can be adjusted between 25°C and 60°C.
Press the ‘Enter key’ to select the required setpoint and then press the ‘Down Arrow’ or the
‘Up Arrow’ key to decrease or increase the temperature. Confirm your selection with the
‘Enter key’.
The second page contains the hot water storage temperature setpoints.
Figure 19 Hot Water Storage Temperature Setpoints Screen
The hot water storage temperature is the temperature at which the water in the hot water
cylinder is stored at. This can be adjusted between 40°C and 60°C*.
Press the ‘Enter key’ to select the required setpoint and then press the ‘Down Arrow’ or the
‘Up Arrow’ key to decrease or increase the temperature. Confirm your selection with the
‘Enter key’.
*The maximum storage temperature achievable will depend on the performance of the DHW
cylinder. Cylinders designed especially for heat pumps have very large heat exchanger coils
(3.0m2or greater) or a plate heat exchanger. These cylinders can achieve a hot water storage
temperature of 60°C. Standard cylinders may only achieve a hot water storage temperature of
between 50°C and 55°C. These cylinders will need an additional heat source such as an
immersion heater to raise the hot water storage temperature above 60°C to prevent legionella.
During commissioning, an engineer will determine the maximum achievable hot water storage
temperature and will decide if an additional heat source is required. This heat source, usually
an immersion heater, is then controlled via the thermal disinfection functionality in the heat
pump. It is good practice to perform a thermal disinfection of the DHW cylinder at least once
per week.

Page 15
2.6.4 Information:
Selecting the information sub-menu allows 5 information screens to be viewed. The first
information screen displays an overview of the refrigeration system including parameters such
as expansion valve opening value, superheat, evaporating temperature, compressor speed and
heat capacity.
Figure 20 Information Screen 1
This screen also displays the current mode of the unit. This can take a number of values
including:
Off –The master control has been switched off. The internal timeclocks or remote digital
inputs will not cause the unit to start.
Standby –The unit is in standby mode and is waiting for a signal from the internal
timeclocks or from a remote digital input to start up.
Heating –The unit is in heating mode meaning it is either heating the heating water or
the hot water storage cylinder.
Stopping –The unit is shutting down after having been in heating mode. This could be
due to having reached the setpoint, no longer receiving a signal from the internal
timeclock or remote digital input.
Anti-cycle –The unit is waiting for the anti-cycle timer to elapse. This anti-cycle timer
function prevents the unit from starting and stopping too frequently. The timer can be
adjusted and disabled by the commissioning engineer, however, it is not recommended
to modify this from the default settings.
Alarm –The unit is in alarm mode due to a fault being detected. The unit will not start up
until the alarm is reset. An engineer is required to investigate.
Waiting –The unit is waiting for an internal timer to be reset. This may have been
triggered by a minor alarm which has reset itself. The unit will return to normal after the
waiting time has elapsed.
The second, third and fourth information screens in the menu display a list of values relating to
the operational performance of the appliance. These values are for monitoring purposes only
and cannot be altered. A description of the information displayed along with expected values
that are considered normal are shown in the following images and accompanying tables.
Figure 21 Information Screen 2

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Text
Description
Expected Value(s)
Heating Flow
This is the temperature at which the heating
water travelling to either the heating circuit or
to the hot water storage cylinder is leaving
the heat pump displayed in degrees Celsius.
Ambient temperature if the appliance is off.
No greater than 65.0 degrees Celsius in
normal operation.
Heating
Return
This is the temperature at which the heating
water returning from either the heating circuit
or to the hot water storage cylinder is
entering the heat pump displayed in degrees
Celsius.
Ambient temperature if the appliance is off.
The value should be approximately 5.0
degrees Celsius below the heating flow
temperature in normal operation. It may vary
when the unit first starts up, is shutting down
or is transitioning between flow temperatures.
H. Flow Rate
The flow rate of the heating water leaving the
appliance, displayed in litres per minute.
This should read 0.0 litres per minute when
the unit is off and between 10.0 and 80.0 litres
per minute in normal operation.
H. Pump
Speed
The speed of the heating pump motor
expressed in a percentage of the maximum
possible speed.
This should read 0.0 percent when the unit is
off and between 25.0 and 100.0 percent in
normal operation.
DHW Temp
This is the temperature of the water in the
storage tank displayed in degrees Celsius.
This should read between 10 and 70 degrees
Celsius.
External Temp
This is the temperature of the outside air
displayed in degrees Celsius.
This should read between -20 and 40 degrees
Celsius.
Figure 22 Information Screen 3
Text
Description
Expected Value(s)
Brine In
This is the temperature at which the brine
enters the heat pump flowing from the ground
collector displayed in degrees Celsius.
Ambient temperature if the appliance is off.
No greater than 25.0 degrees Celsius and no
less than -10 degrees Celsius in normal
operation.
Brine Out
This is the temperature at which the brine
leaves the heat pump flowing to the ground
collector displayed in degrees Celsius.
The value should be approximately 3.0
degrees Celsius below the heating flow
temperature. It may vary when the unit first
starts up, is shutting down or varying output.
B. Flow Rate
The flow rate of the brine leaving the
appliance, displayed in litres per minute.
This should read 0.0 litres per minute when
the unit is off and between 10.0 and 90.0 litres
per minute in normal operation.
B. Pump
Speed
The speed of the brine pump motor
expressed in a percentage of the maximum
possible speed.
This should read 0.0 percent when the unit is
off and between 25.0 and 100.0 percent in
normal operation.
Figure 23 Information Screen 4

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Text
Description
Expected Value(s)
Discharge
Pres.
This is the pressure of the disharge line (the
gas leaving the compressor travelling to the
condenser), displayed in bar.
This should read between 7.0 and 20.0 bar if
the appliance is off and between 2.0 and 12.0
bar in normal operation.
Suction Pres.
This is the pressure of the suction line (the
gas entering the compressor from the
evaporator), displayed in bar.
This should read between 7.0 and 20.0 bar if
the appliance is off and between 15.0 and
45.0 bar in normal operation.
Intermed.
Pres.
This is the pressure of the intermediate line
(the gas entering the compressor from the
economiser), displayed in bar.
This should read between 7.0 and 20.0 bar if
the appliance is off and between 10.0 and
35.0 bar in normal operation.
Comp. Speed
The speed of the compressor expressed in
revolutions per minute (rpm).
This should read 0 rpm when the unit is off
and between 1800 and 7200 rpm in normal
operation.
Main Exp.
Valve
The opening value of the main expansion
valve expressed in a percentage of the
maximum possible opening value.
This should read 0.0 percent when the unit is
off and between 5.0 and 95.0 percent in
normal operation.
EVI Exp. Valve
The opening value of the EVI expansion
valve expressed in a percentage of the
maximum possible opening value.
This should read 0.0 percent when the unit is
off and between 5.0 and 95.0 percent in
normal operation.
Information screen 5 displays a list of values relating to the software used in the appliance as
shown in Figure 24. The most important of these values is the Software Ver. (meaning software
version). The example in Figure 24 displays the Software Ver. as 1.01a. It is beneficial to be
aware of the software version used on the appliance prior to seeking technical support.
Figure 24 Information Screen 5
2.7 Selecting the Engineer Menu
Engineer:
Selecting the engineer menu enters a sub-menu which has a number of information and setting
screens intended for an approved engineer only. For this reason the Engineer utility is
password protected. The password should be entered as shown in Figure 25.
Figure 25 Engineer Password Protection Screen

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As an authorised Engineer and having entered the password the following sub-menus become
accessible: Parameters, Commissioning, Servicing, History, and In/Out.
Figure 26 Engineer Menu Page 1
Figure 27 Engineer Menu Page 2
2.7.1 Parameters:
Selecting the parameters sub-menu allows 9 settings screens to be viewed. The first settings
screen displays the overall unit control strategy. The screen allows the engineer to select if the
unit is controlled by its internal time clocks (Internal timer) or is to be controlled by remote digital
inputs. This control applies for both heating and hot water functionality and cannot be controlled
independent (i.e. heating cannot be controlled by a remote digital input if hot water is controlled
by the internal time clock). The screen also allows tandem mode to be enabled. Tandem mode
allows two or more units to run together to provide a higher heat output and provided a larger
range of heat outputs. For further information on running units in tandem mode please consult
Warmflow.
Figure 28 Parameters Screen 1
The second settings screen displays the flow temperature regulation settings. The screen
allows the engineer to select if the heating flow temperature is to be controlled by a fixed set
point or if it is to be assisted by the built-in weather compensation function. The screen also
allows the user to set the flow temperature setpoint when the unit is in hot water mode.
Figure 29 Parameters Screen 2