CALEFFI SATK40 Series Guide

1
Wall-moun ed compac indirec HIU - DHW produc ion in s orage cylinder
SATK40 series
INSTRUCTIONS FOR INSTALLATION, COMMISSIONING AND MAINTENANCE
CONTENTS Page
Safety instructions
Dimensions
Technical specifications
Installation
Electric connections
Electronic regulator
Characteristic components
Functional characteristics
Safety and alarms
Troubleshooting
2
3
9
Operating cycles
Optional functions 6
5
7
8
10
Maintenance
11
Function
The SAT series HIU allows independent control of space heating and
domestic hot water production within centralised heating systems.
Product range
SATK40103HE Compact wall-mounted HIU for indirect heating
and DHW production in storage cylinder.
High efficiency pump.
78200.01EN
www.caleffi.com
Commissioning check-list 12
Hydraulic connections
Commissioning 4
© Copyright 2016 Caleffi

2
WARNINGS
These instructions must be read and understood before installing and maintaining the device.
CAUTION! FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN A SAFETY HAZARD!
1 The device must be installed, commissioned and maintained by qualified technical personnel in accordance with national regulations and/or relevant local requirements.
2 If the device is not installed, commissioned and maintained correctly in accordance with the instructions provided in this manual, it may not work properly and may
endanger the user.
3 Clean the pipes of any particles, rust, incrustations, limescale, welding slag and any other contaminants. The hydraulic circuit must be clean.
4 Make sure that all connection fittings are watertight.
5 When connecting water pipes, make sure that threaded connections are not mechanically overstressed. Over time this could result in breakage, with water leaks
causing damage and/or injury.
6 Water temperatures higher than 50°C may cause severe burns. When installing, commissioning and maintaining the device, take the necessary precautions so
that these temperatures will not be hazardous for people.
7 In the case of particularly hard or impure water, adequate water filtration and treatment must be assured upstream from the device, in accordance with current
legislation. Otherwise the device may be damaged and will not work properly.
8 Any use of the device other than its intended use is prohibited.
9 Any combination of the device with other system components must be made taking the operational characteristics of both units into consideration.
10 An incorrect coupling could compromise operation of the device and/or system.
IMPORTANT: Risk of electric shock. Live parts. Shut off the electric supply before opening the device box.
1 During installation and maintenance operations, always avoid direct contact with live or potentially hazardous parts.
2 The device must not be exposed to water drops or humidity, direct sunlight, the elements, heat sources or high intensity electromagnetic fields. This device cannot
be used in areas at risk of explosion or fire.
3 The device must be connected to an independent two-pole switch. If work has to be done on the device, cut off the electric supply first. Do not use devices with
automatic or time reset, or which may be reset accidentally.
4 Use suitable automatic protection devices in accordance with the electrical characteristics of the region in which the device is installed and in compliance with
current legislation.
5 The device must always be earthed before it is connected to the electric supply. If the device has to be removed, always disconnect the earth connection after
disconnecting the electric supply conductors. Check that the earth connection has been made to the highest of standards under applicable legislation.
6 Electrical installation must only be carried out by a qualified technician, in accordance with legal requirements.
7 The device does not contain asbestos or mercury.
8 The device is not designed for use by persons of reduced mental, physical or sensory capacity (including children) or persons lacking experience, unless they are
supervised or instructed in use of the device by a person responsible for their personal safety.
LEAVE THIS MANUAL AS A REFERENCE GUIDE FOR THE USER. DISPOSE OF IN ACCORDANCE WITH LOCAL REGULATIONS. THE
MANUFACTURER RESERVES THE RIGHT TO CEASE PRODUCTION AT ANY TIME AND TO MAKE ANY CHANGES DEEMED USEFUL OR
NECESSARY WITHOUT THE OBLIGATION OF PRIOR NOTICE.
SAFETY INSTRUCTIONS
Key to symbols
Primary circuit flow
Primary circuit return
M
High temperature circuit flow
High temperature circuit return
Low temperature circuit flow
Low temperature circuit return
D
Storage flow
Storage return
Domestic cold water inlet
(filling)
P
NOTES:
1 Install water hammer arresters to compensate for any overpressure in the domestic water circuit;
2 In the presence of hot water recirculation or if a non-return valve is fitted into the domestic cold water inlet, provision must be made to accommodate the expansion
of the water contained within the system and the heat interface unit;
3 All hydraulic connections must be checked before pressurising the system. Vibration during transport may cause the connections to become loose. DO NOT APPLY
EXCESSIVE TIGHTENING TORQUE otherwise the components may be damaged.
For the updated version o the technical documentation re er to www.cale i.com

3
Dimensions
10
550
65282,5
15565
629
530
149 656550.5 50.5
3/4” M 3/4’’ F
SATK40103HE technical specifications
Medium: water
Maximum percentage of glycol: 30%
Maximum medium temperature: 85°C
Max. working pressure: - primary circuit: 1,6 MPa (16 bar)
- secondary circuit: 0,3 MPa (3 bar)
Nominal heat exchanger capacity: 15 kW
Maximum recommended primary circuit flow rate: 1,2 m3/h
Max. differential press. on modulating valve: Dp 150 kPa (1,5 bar)
Electric supply: 230 V (ac) ±10% 50 Hz
Maximum power consumption: 80 W
Protection class: IP 40
Pump: UPM3 15-70
Pump by-pass setting: 45 kPa (0.45 bar)
Actuators: stepper 24 V
Probes: NTC 10 k Ω
Safety relief valve setting: 0,3 MPa (3 bar)
Safety thermostat: 55°C ±3
Expansion vessel: - capacity 7 l
- pre-charge value: 0,1 MPa (1 bar)
Pressure switch: - opening 40 kPa (0,4 bar)
- closing 80 kPa (0,8 bar)
Materials
Components: brass EN12165 CW617N
Fitting pipes: steel
Frame: RAL 9010 painted steel
Protective shell cover: PPE
Heat exchanger: brazed stainless steel
Installation
The SAT series HIU is designed for installation in a protected
domestic (or similar) environment and must not therefore be
installed or used outdoors, i.e. in areas directly exposed to the
weather. Outdoor installation may cause malfunctioning and
hazards.
If the device is enclosed inside or between cabinets, sufficient
space must be provided for routine maintenance procedures.
It is recommended that electrical devices are NOT placed
underneath the HIU, as they may be damaged in the event of safety
relief valve activation if not connected to a discharge tundish, or in
the event of leaks occurring at the hydraulic fittings.
If this advice is not heeded, the manufacturer cannot be held
responsible for any resulting damage.
In the event of a malfunction, fault or incorrect operation, the device
should be deactivated; contact a qualified technician for
assistance.
Preparation
After having established the point where the appliance is to be
installed perform the following operations:
· Mark the holes required for securing the HIU to the wall
· Mark the position of the hydraulic connections
Check the measurements again and begin laying the following
lines:
Hydraulic (see page 4):
1. connection to the central system line
2. heating circuit connection
3. connection to domestic hot water storage
4. domestic cold water circuit connection (for filling)
5. conveyance of safety relief valve and charging unit backflow
preventer discharge
Electric (see page 9):
1. 230 V (ac) – 50 Hz electric supply line
2. chrono-thermostat/thermostat line (potential-free)
3. hot water storage thermostat line (live line)
4. centralised bus line for heat meter data transmission (if required)
5. centralised electric supply line for heat meter (if required)
N.B.: the wall anchors (not supplied) can only guarantee effective
support if inserted correctly (in accordance with good technical
practice) into walls built using solid or semi-solid bricks. If working
with walls built using perforated bricks or blocks, mobile dividing
panels or any masonry walls other than those indicated, a
preliminary static test must be carried out on the support system.
Heat meter installation
The HIU is designed to fit a compact heat meter (with incorporated
return probe) with 1” threaded connections and 130 mm gauge.
Before carrying out any maintenance, repair or part replacement
work, proceed as follows:
- cut off the electric supply
- remove the cover
- close the shut-off valves
- empty the HIU using the drain cocks provided
Proceed as described below to install the heat meter:
- remove the template (A)
- remove the cap (B)
- install the flow meter on the return pipe
- install the flow probe in the M10 pocket (B).
Please refer to the heat meter technical data sheets for further
information.
A
B

4
Hydraulic connections
Hydraulic connections to the centralised line must be implemented
using the manual shut-off valves supplied with the HIU, which allow
any necessary maintenance work to take place without having to
empty the centralised system.
It is advisable to install manual shut-off valves (not supplied) also
on the bottom terminals connecting to the dwelling.
Before installation, it is recommended to carry out accurate flushing
of all the pipes of the system in order to remove any residue or
impurities that could endanger correct operation of the HIU.
In order to facilitate these operations a manual bypass flushing
valve is available (code 789100).
N.B. DHW storage not supplied
N.B. Install the valves as shown in the igure
N.B.:
1 Install water hammer arresters to compensate for any overpressure in the domestic water circuit;
2 In the presence of hot water recirculation or if a non-return valve is fitted into the domestic cold water inlet, provision must be made to accommodate the expansion
of the water contained within the system and the heat interface unit;
3 All hydraulic connections must be checked before pressurising the system. Vibration during transport may cause the connections to become loose. DO NOT APPLY
EXCESSIVE TIGHTENING TORQUE otherwise the components may be damaged.
Fitting the cover
Place the casing over the frame, inserting the upper tabs (1) into
the corresponding slots (2).
Place the lower part of the casing over the frame.
Tighten the screws (3).
3
21
System start-up
Before starting the HIU, visually check the hydraulic connection
watertightness and the electric wiring. After finishing the check,
activate the electric supply to the HIU and check for the presence
of any error signals.
If there are any, eliminate the fault indicated and proceed as
described below, setting the set point of the domestic water and
heating cycles, programming the thermostat/chrono-thermostat
according to the desired temperatures and times, and checking
the operating cycles.
Commissioning
Filling the central heating system
Open the shut-off valves on the connections to the centralised line
and, in the central heating system, proceed with charging the
system to the design pressure.
Once these procedures are complete, vent the system and check
its pressure again (repeat the filling process if necessary).
Filling the user system
SAT 40 series HIUs are fitted with a filling unit equipped with a
backflow preventer (A), check valve (B) and cock (C) .
When filling the system for the first time or for subsequent top-up
procedures following a heating circuit pressure switch fault, restore
the system pressure (0,12–0,2 MPa - 1,2–2 bar) by opening cock
(C) and checking the value by means of the pressure gauge (D).
Once the correct pressure has been reached, close the cock (C),
vent the system and re-check the pressure (repeat the filling
process if necessary).
C
D
A
B

5
Operating principle
All heating and domestic hot water functions offered by SAT 40
series HIUs are controlled by a digital temperature regulator.
Automatic controller unctions
• Reset o diverter/modulating valves
Immediately after the power supply has been switched on, the
position of the installed diverter/modulating valve is reset.
• Pump anti-seizing
When the pump is not in use, it is powered on for a period of
5 seconds every 24 hours.
• Diverter/modulating anti-seizing cycle
The anti-clogging cycle for the diverter/modulating valves is run
every 24 hours.
• LCD display
Shows programmed set point temperatures and error codes.
88
• Trimmers or set point settings
They allow the setting of the temperature set point for the operating
cycles and view the relative value on the display.
• Dip switches
Allow set-up of the various models and enabling of optional
functions.
User inter ace
The user interface, built into the PCB, consists of the following
devices:
• LED indicator
The various functions and faults are signalled by either flashing or
steady illumination of the LEDs.
ON - Electric supply 230 V (ac)
DHW - Domestic cycle
CH - Heating cycle
FAULT - Fault detected
Heating cycle
Electronic regulator
123456
Definition of simultaneous heating and
DHW cycle times (see page 6)
• RESET key
This allows restoration of normal function after the safety thermostat
has been triggered and activation/deactivation of the floor slab
heating function.
1 23 45 6 4
ON
Connection to the chrono-thermostat
The SAT series HIU is fitted for connection to a thermostat or
chrono-thermostat, both standard and OpenTherm, for room
temperature adjustment.
The connection to this device (po en ial-free con ac ) must be
made with the two-wire cable marked with the label shown below.
Should it be necessary to extend this cable, use one with the same
cross-section (max 1 mm2) and maximum length 30 m.
Raumthermostat
(Potenzialfreier Kontakt)
Sonde d’ambiance
(Contact sec)
Termostato de ambiente
(Contacto sin potencial)
Ruimtesensor
(Schoon contact)
WARNING!
DO NOT CONNECT EXTERNAL
VOLTAGE SUPPLY TO THESE
TERMINALS
ATTENZIONE!
NON ALIMENTARE IN TENSIONE
Termostato ambiente
(Contatto pulito)
Room thermostat
(Volt free connection)

6
60
4
60
4
25
7
8 seconds
1
OFF
Operating cycles
Domestic cycle
(assumes priority over the heating cycle in the de ault
con iguration)
In response to a request for execution of the DHW cycle due to
tripping of the storage thermostat, the regulator opens the primary
circuit modulating valve fully, switches the diverter valve towards
the storage circuit, and starts the circulation pump.
In order to reduce the storage temperature maintenance cycle
times no check is performed on the water temperature supplied to
the storage (ON-OFF regulation).
When the storage temperature is reached the circulation pump is
stopped and the modulating valve is closed.
The domestic water cycle, when active, is indicated by the steady
yellow DHW LED while the symbol is blinking.
Heating cycle - Fixed set point regulation
In response to a heating cycle request from the room thermostat
the circulation pump is powered while the modulating valve is
opened gradually until the set point temperature is reached.
At the end of the heating cycle, the circulation pump comes to a
stop and the modulating valve is closed.
The active heating cycle is signalled by the yellow CH LED which
comes on while the symbol is blinking.
The heating cycle temperature set point can be set using trimmer
P2 and shown on the display.
Floor slab heating unction (LOW temperature setting)
Facilitates the installation of underfloor heating systems at low
temperatures. This function can only be activated and executed if
there are no faults.
It can be activated by pressing and holding the RESET button for
8 seconds.
The yellow CH LED blinks while the floor slab heating function is in
operation.
The function lasts 240 hours and is carried out by simulating a
request to run in heating mode starting from a set point of 25°C and
rising in regular intervals to a temperature of 45°C. Once the
maximum set point has been reached the function is executed
following the same procedures, in reverse.
This function has priority over heating and domestic water cycles,
and can be suspended at any time by pressing and holding the
RESET button for 8 seconds.
Optional functions
(to activate/deactivate the optional functions the electric power
supply must always be turned off!)
Heating cycle
Modulating temperature regulation with compensated set
point
The function is enabled by setting DIP switch 1 to the OFF position.
When the function is enabled, the flow temperature is modified
according to the temperature detected by the compensation probe
in order to maintain this latter temperature value constant. This
keeps the actual thermal output of the slab - and therefore the
ambient thermal load - under control. The thermal response time of
the system is thus minimised.
If the function is enabled the display shows the return temperature,
and the flow temperature is adjusted in accordance with the
following formula:
Flo temperature = Return temperature + DT
In MEDIUM/HIGH temperature setting: DT 10–25°C
At LOW temperature setting: DT 4–10°C
DHW circui absolu e priori y disabling
Heating the hot water storage may, in the presence of a concurrent
demand to perform a heating cycle, significantly delay the heating
cycle and thus compromise the room comfort level. The absolute
priority assigned to the DHW cycle can be disabled by setting dip
switch 5 to ON. In this case, during the period of simultaneous
requests for domestic water and space heating cycles the regulator
will assign periods of 10 minutes between the two cycles. The
active cycle is shown by blinking of the corresponding LED while
the inactive cycle LED remains steady on. By using trimmer P1 the
duration of the storage cylinder heating stage can be set (from 1 to
9 minutes).
(e.g. if you set “6”, 6 minutes every 10 will be dedicated to heating
the storage cylinder, the remaining 4 to the space heating cycle).
5
ON

7
Heating circuit pressure switch ault
Error code 4
The SAT 40 series HIU continuously monitors the status of the
pressure switch controlling the water pressure in the closed-circuit
user heating system.
If the pressure switch trips, the heating circulation pump
immediately comes to a stop and the modulating valve is
completely closed.
N.B.: A low expansion vessel pre-charge value can cause a
pressure switch fault (see page 4 - “Filling the user system”).
Sa ety thermostat cut-out
(in LOW temperature setting)
Error code 69
The HIUs configured to support low temperature heating
continuously monitor the safety thermostat controlling the flow
temperature.
If the safety thermostat is activated during a general cycle, the
heating circulation pump immediately comes to a stop and the
modulating valve is completely closed.
Removing a ault
To restore the operating mode press the manual
RESET button.
Safety and alarms
Error codes associated with faults signalled by illumination of the
FAULT LED are also shown on the display.
69
6
Removing a ault
Return to the operating mode is possible once the temperature
probe is operating correctly (see page 10 - “Temperature probe
replacement”).
4
Probe ault
If a temperature probe fails, the associated cycle will be stopped
immediately and disabled.
Any requests to run cycles not associated to the previous one will
continue to run normally.
Heating probe ault
Error code: 5
5
Compensation probe ault
Error code: 15
Removing a ault
Restore the correct switch setting as shown on page 8.
79
Incorrect DIP-switch setting
Error code 79
Removing a ault
The heat interface unit is disabled due to incorrect setting of the
dip-switches. Restore the correct setting as shown on page 8.
Incorrect DIP switch setting (heat inter ace unit disabled)
Error code 80
80

8
1
2
3
5
4
6
7
8
9
10 11
12
13
14
15
16
17
18
20
19
1. Frame
2. Expansion vessel
3. Electronic regulator
4. Electrical connections box
5. 2-way modulating valve (primary circuit)
6. Diverter valve
7. Heating flow temperature probe
8. Thermal safety thermostat
9. Secondary heating drain cock
10. Filling unit with backflow preventer
11. Safety relief valve
12. Pump UPM3 15-70
13. Pressure switch
14. Protective by-pass
15. Flow temperature compensation probe / secondary circuit
strainer
16. Plate heat exchanger
17. Heat meter spacer template
18. Primary air vent cock
19. Primary circuit strainer/flow probe pocket
20. Primary circuit shut-off valves
SATK40103HE HIU for DHW production in storage cylinder with high-efficiency pump
Functional characteristics
Heating range
- LOW temperature setting 25–45°C
- HIGH temperature setting 45–75°C
Optional unctions
Heating cycle:
- modulating temperature regulation with compensated set point
- floor slab heating function
Characteristic components
Factory settings
SAT 40 HIUs are factory set to support low temperature heating
(25–45°C), according to the following switch setting:
To change the factory settings and enable the HIU to support
medium/high temperature systems (45–75°C), proceed as
follows:
1 - cut off the electric power supply to the HIU
2 - set switches 2-3 according to the following setting:
3 - disconnect the thermal sa ety thermostat and apply a
jumper on the cable (see page 9 re . 5)
4 - restore the electric supply.
1 23 45 6 4
ON
1 23 45 6 4
ON
Factory set (do not change)
May be changed to activate optional unctions
Switch 1: modulating temperature regulation
with compensated set point
Switch 2-3: change temperature range
Switch 5: DHW circuit absolute priority
disabling
OFF
ON
OFF
ON

9
FUSE 5x20
FUSE 5x20
12 3 45678
10
9
13
12
14 11
13 15
6 35 4 21
16
• Usare solo per collegamento a cod. 789835
• Use this wire for connection to code 789835 only
• À n'utiliser que pour la liaison avec code 789835
• Verwenden Sie dieses Gerät nur zum Anschluss
an die Art.Nr. 789835
• Gebruik deze enkel voor aansluiting op code 789835
• Utilice solamente para la conexión con cod. 789835
• Usare solo per collegamento a cod. 789835
• Use this wire for connection to code 789835 only
• À n'utiliser que pour la liaison avec code 789835
• Verwenden Sie dieses Gerät nur zum Anschluss
an die Art.Nr. 789835
• Gebruik deze enkel voor aansluiting op code 789835
• Utilice solamente para la conexión con cod. 789835
Raumthermostat
(Potenzialfreier Kontakt)
Sonde d’ambiance
(Contact sec)
Termostato de ambiente
(Contacto sin potencial)
Ruimtesensor
(Schoon contact)
Termostato ambiente
(Contatto pulito)
Room thermostat
(Volt free connection)
Electric wiring
1Electronic regulator
2 To electrical connections box
3Flow temp. compensation return probe
4 Modulating valve actuator
5 Thermal safety thermostat
6 Pressure switch
7 Heating flow temperature probe
8 Diverter valve actuator
9 Earth
10 Pump
11 Electric supply 230V (ac)*
12 Room thermostat*
13 Protection fuse
14 Storage cylinder thermostat*
15 Electrical connections box
16 HIU enabling
* Wiring required during installation (room thermostat
and storage thermostat not supplied)
Electric connections
Make sure that the electrical system can withstand the maximum power consumption of the appliance, with particular emphasis on the cross-section
of the cables.
If you have any doubts, contact a qualified technician to request a thorough check of the electrical system.
Electrical safety of the appliance is only achieved when it is correctly connected to an effective earthing system, constructed as specified in current
safety regulations. This is a compulsory safety requirement.

10
Maintenance
All maintenance procedures should be carried out by an authorised
technician.
Regular maintenance guarantees better efficiency and helps to
save energy.
Before carrying out any maintenance, repair or part replacement
work, proceed as follows:
- Cut off the electric supply
- Remove the cover
- Close the shut-off valves
- Empty the heat interface unit using the drain cocks provided.
Heat exchanger replacement
- Remove the heat exchanger, loosening the 2 hex socket head
screws fixing it in place (A)
- Replace the heat exchanger and the O-rings.
- Tighten the two fixing screws (A).
N.B. The pins fixing the heat exchanger are positioned in such a way
as to allow it to be placed only in the correct direction.
Strainer cleaning
All the HIUs have strainers on the inlet for water from the centralised
system and on the secondary circuit.
To clean these strainers, carry out the following maintenance
procedure:
- Unscrew the cap (B)
- Remove the mesh strainer and discard any impurities
- Refit the mesh strainer
- Refit the cap and tighten it.
Replacing the valve actuator
- Disconnect the actuator cable, lightly pressing the tab on the
connector and extracting it (see page 9, ref. 4-8)
- Extract the fixing clip (D) and then the actuator
- Position the new actuator (E)
- Insert the fixing clip, respecting the correct direction
- Reconnect the connector.
Replacing the valve obturator
- Disconnect the valve actuator (see previous paragraph)
- Extract the obturator by unscrewing the locking nut (F)
- Replace the obturator and screw on the locking nut (F), then
insert the actuator
- Insert the fixing clip, respecting the correct direction
- Reconnect the connector.
A
A
B
Temperature probe replacement
- Disconnect the probe cable, lightly folding the tab (C) and
extracting the connector (see page 9, ref. 3-7)
- Unscrew the probe
- Fit the new probe
- Reconnect the connector respecting the only possible way it can
be inserted.
C
D
E
F
Vessel pre-charge check
For correct operation of the system periodically check (at least
once every six months) the vessel pre-charge value. Perform check
by means of the following actions:
- Close the shut-off valve
- Empty the HIU using the drain cocks provided.
- Use a pressure gauge to check the pre-charge value
- If necessary, restore the pre-charge value shown in the technical
specifications.
When carrying out maintenance on the electrical part, for the
connections follow the diagram on page 9.
After concluding maintenance, proceed with the filling and
checking operations described in the chapter “Commissioning” on
page 4 and fit the cover.
If you require any information regarding spare parts, please contact
Caleffi spa.

11
Troubleshooting
FAULT DESCRIPTION INDICATIONS POSSIBLE CAUSE OF FAULT OPERATIONS TO BE PERFORMED
Water is not
heated
DHW LED on
primary circuit shut-off valves closed open the valves
modulating valve actuator connector disconnected reconnect actuator connector
modulating valve actuator disconnected from valve body reconnect actuator
modulating valve actuator faulty call qualified personnel to have it replaced
pump not working call qualified personnel to have it replaced
pump cable not connected restore connection
presence of air in the system vent the system
electronic controller not working call qualified personnel to have it replaced
diverter valve obturator seized call qualified personnel to have it replaced
centralised system not working contact person in charge of system
FAULT LED on + error
code 4 active
FAULT LED on + error
code 69 active
FAULT LED on + error
code 79/80 active
heating circuit pressure too low
safety thermostat cut-out
incorrect switch setting
restore system pressure
call qualified personnel to have it serviced
restore correct switch setting
DHW LED off DHW storage thermostat disconnected reconnect thermostat
DHW storage thermostat faulty call qualified personnel to have it replaced
all LEDs are off electric supply cut off restore HIU electric supply
protection fuse burnt out call qualified personnel to have it replaced
The water is hot
but does not
reach the
desired
temperature
DHW LED on
DHW temperature too low increase set point
HIU strainer clogged call qualified personnel to have it serviced
pump not working call qualified personnel to have it replaced
excessive demand for DHW decrease demand
electronic controller not working call qualified personnel to have it replaced
centralised system temperature insufficient contact person in charge of system
primary circuit flow rate insufficient contact person in charge of system
Hot water
temperature is
too high
DHW LED on
domestic water cycle temperature set point too high decrease set point
thermostat faulty restore correct connection
modulating valve actuator faulty call qualified personnel to have it replaced
valve obturator blocked in intermediate or open position call qualified personnel to have it replaced
electronic controller not working call qualified personnel to have it replaced
Hot water low
rate is
insu icient
DHW LED on
possible clogged strainers call qualified personnel to have it serviced
possible domestic water system shut-off valves
partially closed
open the valves
centralised domestic circuit cold water flow rate insufficient call qualified personnel to have it serviced
Hot water low rate
is zero
DHW LED off possible domestic water system shut-off valves closed open the valves
no cold water in centralised domestic circuit call qualified personnel to have it serviced
The room does
not reach the
desired
temperature
CH LED on
heating cycle temperature set point too low increase set point
chrono-thermostat temperature setting incorrect check programming of chrono-thermostat
HIU strainer clogged call qualified personnel to have it serviced
heating valve actuator faulty call qualified personnel to have it replaced
heating valve obturator blocked call qualified personnel to have it replaced
modulating valve actuator connector disconnected reconnect actuator connector
presence of air in the system vent the system
pump not working call qualified personnel to have it replaced
pump cable not connected restore connection
possible system shut-off valves/terminals closed open the valves
centralised system temperature insufficient contact person in charge of system
electronic controller not working call qualified personnel to have it replaced
primary circuit flow rate insufficient contact person in charge of system
centralised system not working contact person in charge of system
CH LED off chrono-thermostat time setting incorrect check programming of chrono-thermostat
chrono-thermostat not working check chrono-thermostat
all LEDs are off Electric supply cut off restore HIU electric supply
Protection fuse burnt out call qualified personnel to have it replaced
FAULT LED on + error
code 4 active
heating circuit pressure too low restore system pressure
FAULT LED on + error
code 5 active
heating temperature probe faulty call qualified personnel to have it replaced
FAULT LED on + error
code 15 active
compensation temperature probe faulty call qualified personnel to have it replaced
FAULT LED on + error
code 69 active
safety thermostat cut-out call qualified personnel to have it serviced
FAULT LED on + error
code 79/80 active
incorrect switch setting restore correct switch setting
Start-up o the
heat inter ace
unit heating
unction causes
the sa ety circuit
breaker to trip
All LEDs are off pump cable connector inserted the wrong way round Check that the pump cable connector is inserted
the right way round

Commissioning check list
Checks to be per ormed
1 Is the heat interface unit properly secured to the wall?
2 Has the system flushing been carried out?
3 Check strainers and clean them if necessary
4 Is the heat meter (if present) connected?
5 Is the heat meter (if present) connected to the building datalogger (if required)?
6 Has the modulating temperature regulation with compensated set point (normally off)
been activated (if required)?
7 Is the heat interface unit connected to the 230 V (ac) electric supply?
8 Is the room thermostat (potential-free contact) connected?
9 Has the storage thermostat been connected?
10 Has the visual inspection of the HIU internal electrical connections given a positive result and are the
connections compliant with specifications and made in accordance with best practices?
11 Are the shut-off valves open?
12 Has the visual inspection of the hydraulic connections given a positive result?
13 Has the system been filled and vented?
14 Is the heat interface unit powered (green “ON” LED lit)?
15 No alarm code (“fault” LED lit) on heat interface unit regulator?
16 Has the DHW set point temperature on the storage thermostat been set to the required value?
19 Has the heating flow temperature been set to a correct value?
18 Is the primary circuit at working temperature?
19 Check that “CH” LED lights approx. 10 seconds after the thermostat trips
20 Check that the pump operates correctly when the room thermostat trips
(check that secondary heating flow pipes start to heat up)
21 Check that the pump operates correctly when the storage thermostat trips
(check that flow pipe to the storage cylinder starts to heat up)