CALEFFI SATK22205, SATK22105, SATK22103, SATK22203, SATK22305 Installation, Operation & Maintenance Instructions Manual

Caleffi group

SATK22

heat interface unit

Installation Operation & Maintenance Instructions

SATK22

SATK22

Function

The SATK22 HIU allows independent control of heat regulation
and domestic hot water production within centralised heating
systems or systems served by district heating networks.

The heat interface unit features exceptional flexibility of
installation and remote controllable smart electronic functions
designed to enhance efficiency of the system.

NOTE: Due to the specification ordered, or the country of

destination, the actual unit may differ from those shown.

Content

Function 1
Safety instructions 1
Dimensions and connections 3
Technical specification 3
Components & schematic SATK2210 & SATK2220 4
Components & schematic SATK2230 & SATK2240 5
Installation 6
Heat meter installation 8
Electrical connections 8
Remote user interface 11
Commissioning 10
Remote user interface - quick guide 12
Heating functions 13
DHW functions 15
Primary flow rate limitations 17
Circulator - curves and settings 18
Auxiliary microswitch 19
Modbus 20
Safety and alarms 21
Electric circuit board and connections 22
Maintenance 23
Fault finding 26

Check List 27

Safety Instructions

WARNING

These instructions must be read and understood
before installing and maintaining the HIU.
CAUTION! FAILURE TO FOLLOW THESE
INSTRUCTIONS COULD RESULT IN A SAFETY
HAZARD!

Product Range
SATK22103 Direct wall-mounted HIU for LOW temperature

heating. Domestic hot water capacity 50 kW

SATK22105 Direct wall-mounted HIU for LOW temperature

heating. Domestic hot water capacity 60 kW

SATK22203 Direct wall-mounted HIU for MEDIUM

temperature heating. Domestic hot water capacity 50 kW

SATK22205 Direct wall-mounted HIU for MEDIUM

temperature heating. Domestic hot water capacity 60 kW

SATK22305 Direct wall-mounted HIU for HIGH temperature

heating. Domestic hot water capacity 60 kW

SATK22403 Direct wall-mounted HIU for HIGH temperature

heating. Domestic hot water capacity 50 kW

1

1

1

1

with primary

1

1

pump

SATK22405 Direct wall-mounted HIU for HIGH temperature

heating. Domestic hot water capacity 60 kW

1

with primary

pump

1

Primary side head > 50 kPa, primary flow temperature 70˚C,

DHW 10 to 50˚C.

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 correctly and may endanger
the user.

3 Flush the pipework thoroughly before installing the HIU to

remove any particles, rust, incrustations, limescale, welding
slag and any other contaminants.

The water circuits must be clean and free from debris.

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 may result in breakage, causing water damage and/or

personal 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.

1

SATK22

Hightemperaturecircuit flow

Hightemperaturecircuitreturn

Mediumtemperaturecircuit flow

Mediumtemperaturecircuitreturn

Lowtemperaturecircuit flow

Lowtemperaturecircuitreturn

Domestic hotwateroutlet

Domestic cold water inlet

Primary circuit flow

Primary circuit return

7 In the case of particularly hard or impure water, there must

be suitable provision for filtering and treating the water
before it enters the device, in accordance with current
legislation. Failure to do so may result in the HIU becoming
damaged or working incorrectly.

8 Any use of the HIU other than it’s intended use is

prohibited.

9 Any coupling of the device with other system components

must be made while taking the operational characteristics
of both units into consideration.

10 An incorrect coupling could compromise the operation of

the device and/or system.

NOTE: Risk of electric shock. Live parts. Shut off the electric

supply before opening the HIU cover.

1 During installation and maintenance operations, always

avoid direct contact with live or potentially hazardous parts.

2 The device must not be exposed to dripping water 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 bipolar

switch. If work has to be done on the device, switch 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 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. Check that the earth connection has been
made to the highest of standards under current legislation.

6 Electrical installation must only be carried out by a qualified

technician, in accordance with current requirements.

7 The HIU does not contain asbestos or mercury.
8 The HIU should only be used by an authorised adult.

NOTES:

1 Install water hammer arresters to compensate for any

overpressure in the domestic water circuit.

2 In the presence of hot water re-circulation or if a check valve

is fitted into the domestic cold water inlet, suitable devices

must be used to accommodate the expansion of the

medium contained within the system and the heat interface

unit.

3 All hydraulic connections must be visually checked while

pressurising the system. Vibration during transport may

cause the connections to become loose. If a fitting needs to

be tightened apply an appropriate tightening torque,

otherwise the components may become damaged.

Key to SymbolsSafety Instructions

General Information

• Please leave the manual as a reference guide for the user.

• Dispose of any packaging in an appropriate manner, most

of which can be recycled.

• In this Installation, Operation and Maintenance guide we

have endeavoured to make the information as accurate as
possible.

We cannot accept any responsibility should it be found
that in any respect the information is inaccurate or
incomplete or becomes so as a result of further
developments or changes to the products.

Material

Components: brass BS EN 12165 CW617N
Pipes: stainless steel
Frame: RAL 9010 sprayed steel
Exchanger: brazed stainless steel

Insulation

Protective shell cover: EPP
Density: 45 kg/m
Working temperature range: 3 to 90˚C
Thermal conductivity: 0.04 W/mK

3

2

SATK22

857070 60 60

490

75

130

245

42 28

444

514

All connections G¾B

Dimensions

Connections

Technical Specification

Medium: Water
Max. percentage of glycol 30%
Max. temperature: 90˚C
Max. static working pressure: Primary: 10 bar

Secondary: 10 bar

Domestic hot water: 10 bar
Primary circuit Nominal flow rate: 1.2 m
Nominal pressure loss on primary circuit: 0.5 bar
Max. differential pressure: 6 bar
Domestic water circuit max. flow rate: 24 l/min (0.4 l/s)
Min.flow rate to activate domestic flow sensor: 2.0 l/min ±0.3

3

/h

Power supply: 230 V (ac)±10% 50 Hz
Max. power consumption: 80 W

SATK2230 20W
Protection class: IP 40
Pump: UPM3 15-70
Actuator: stepper 24 V
Probes: NTC 10 kΩ
Safety relief valve setting: 3 bar
Safety thermostat - STK2210: 55˚C ±3

3

SATK22

1

2

3

4

5

6

7

8

9

10

11

12 14 15 16

21

25
24

20

19

18

17

TS

TA

2

V

V

V

V

V

V

3

4

7

12

13*

5

6

8

9

10

11

21

14

15

19

24

20

17

16

17

22*

23*

25

* SATK2210. only (LOW temperature)

1

2

3

4

5

6

7

8

9

10

11

12 13 14 15 16

21

25
24
23

22

20

19

18

17

Components - SATK2210 (LOW temperature)

Components - SATK2220 (MEDIUM temperature)

Components - SATK2210 & SATK2220

Item Component

1 Frame
2 Electronic regulator
3 2-way modulating valve - heating
4 2-way modulating valve - DHW
5 130 mm space for heat meter
6 ¼”F pressure port
7 Return temperature probe
8 Connection for M10 x 1 heat meter return probe

9 Primary drain cock
10 Differential pressure control valve
11 Mesh strainer + ¼” F pressure port
12 Heating flow temperature probe

13* Safety thermostat

14 Secondary drain cock + mesh strainer
15 Pump
16 Flow meter (turbine + sensor)
17 Mesh strainer
18 Heating exchanger primary drain
19 DHW temperature probe
20 DHW heat exchanger
21 Connection for M10 x 1 heat meter flow probe

22* Thermal safety solenoid valve (normally closed)
23* Thermal safety valve actuator

24 Water hammer arrester
25 Heat exchanger primary circuit air vent

*only included in SATK2210

Schematic Diagram SATK2210 and SATK2220

4

SATK22

1

2

3

4

5

6

7

8

9

10

11

13 14 16

21

23
22

20

19

18

17

1

2

3

4

5

6

7

8

9

10

11

12 13 15 16

21

23
22

20

19

18

17

TA

2

V

V

V

V

V

V

3

4

7

5

6

8

9

10

11

21

13

14#

19

22

20

23

16

17

18

12*

15*

* SATK2230. only

# SATK2240. only

Components - SATK2230 (HIGH temperature)

Components - SATK2240 (HIGH temperature with pump)

Components - SATK2230 & SATK2240

Item Component

1 Frame

2 Electronic regulator

3 2-way modulating valve - heating

4 2-way modulating valve - DHW

5 130 mm space for heat meter

6¼”F pressure port

7 Return temperature probe

8 Connection for M10 x 1 heat meter return probe

9 Primary drain cock
10 Differential pressure control valve
11 Mesh strainer + ¼” F pressure port

12* ¹/” connection for DPCV code 789122

13 Secondary drain cock + mesh strainer

14# Pump

15* Spool piece

16 Flow meter (turbine + sensor)
17 Mesh strainer
18 Heating exchanger primary drain
19 DHW temperature probe
20 DHW heat exchanger
21 Connection for M10 x 1 heat meter flow probe
22 Water hammer arrester
23 Heat exchanger primary circuit air vent

Schematic Diagram SATK2230 and SATK2240

*only included in SATK2230
#only included in SATK2240

5

SATK22

Installation

The SATK22 HIU is designed for installation in a sheltered domestic environment (or similar), therefore it cannot be installed or
used outdoors, i.e. in areas directly exposed to the weather. Outdoor installation may cause malfunctioning and hazards.

If the appliance is enclosed inside or between cabinets, sufficient space must be provided for routine maintenance procedures.
It is NOT recommended to place electrical devices underneath the HIU, as they may become damaged 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 appliance should be de-activated; contact a qualified technician for
assistance.

Before installation, it is recommended to carry out a thorough flushing of all the pipe work in order to remove any debris or
impurities that could prevent the correct operation of the HIU.

In order to facilitate these operations a manual bypass flushing valve is available (Code 789110).

NOTE:

When the first fix bracket is not used we recommend installing manual shut-off valves, especially on the connections to the primary
line, thus allowing any necessary maintenance work to be carried out without having to empty the centralised system.

Hydraulic connections - reversibility

Installation of the SATK22 heat interface unit is reversible (top down) with the exception of the LOW temperature Unit SATK2210.
Installation in the two positions is possible with or without the first fix bracket Code 789023.

Installation with Mounting Bracket

Ensure the wall is structurally suitable for mounting the HIU, follow the instruction below.

• Using the mounting bracket as a template mark the position of the holes required to secure the HIU to the wall. Ensure the

mounting bracket is horizontal.

• Hang the HIU onto the wall bracket and secure to the wall using the fixing holes provided.

• Mark the position of the hydraulic connections

Check the measurements again and based on the above connection diagram and the dimensions shown on page 3, proceed with the
installation of the following lines:

1 connection to the central system line
2 heating circuit connection

3 domestic water circuit connection
NOTE:

We recommend installing manual shut-off valves, especially on the connections to the primary lines, thus allowing any necessary
maintenance work to be carried out without having to empty the centralised system.

Before installation, it is recommended to carry out thorough flushing of all the pipes of the system in order to remove any residue or
debris that could endanger correct operation of the HIU.

In order to facilitate these operations a manual bypass flushing valve is available (code 789110).

6

SATK22

Installation with mounting bracket

Connections at the bottom

Connections at the top

Installation with mounting bracket and first fix bracket

Ensure the wall is structurally suitable for mounting the HIU, follow this instruction below.

• Using the mounting bracket as a template mark the position of the holes required to secure the HIU to the wall. Ensure the

mounting bracket is horizontal.

In order to facilitate these operations a manual bypass flushing valve is available (code 789110).

Connections at the bottom

7

SATK22

A

B

Electric supply

Connections at the top

Hydraulic connections

Based on the dimensions and connection diagram on page 3.

• Connection to the central primary heating system.

• Connect to the apartment heating system.

• Connect to the domestic hot water system (DHW).

NOTE:

When installing with the connections at
the bottom secure with safety screws as
shown.

Install the SATK22 as shown and using
sealing washers connect the HIU to the
valves on the first fix bracket.

Heat meter installation

The HIU is designed to house a compact heat meter (with
incorporated return probe) with 1” threaded connections and
length of 130 mm.

Before carrying out any maintenance, repair or part
replacement work, proceed as follows:

• Switch off the electric supply

• Remove the cover

• Close the shut-off valves

• Drain the HIU using the drain cocks provided

• Remove the spool piece (A)

• Remove the cap (B)

• Install the flow meter on the return pipe. To tighten the nuts

apply maximum tightening torque of 25 Nm, taking account
of the recommendations of the heat meter manufacturer.

• Install the flow probe in the M10 pocket (B).

Please refer to the heat meter technical data sheets for further
information.

Electrical Installation

Connecting to the electricity supply

The HIU is supplied with an electric supply cable which is not
fitted with a plug.

The appliance should be electrically connected to a 230 V (ac)
single-phase + earth mains supply using the three-wire cable
marked with the label as specified below, observing the LIVE (L)

- NEUTRAL (N) polarities and the earth connection. This line
must be connected to an On/OFF switch.

8

SATK22

1

2

3

4

5

6

7

Electrical Installation Continued

Connecting to the electricity supply

To extend the cable if necessary, use a flexible cable suitable for
kitchen and heating appliances and for home, kitchen and
office installations, also in humid environments subject to
medium levels of mechanical stress (e.g. H05V2V2-F: Uo/U
300/500 V). Cable minimum cross-section 3 x 0.

Make sure that the electrical system can withstand the
maximum power consumption of the HIU, with particular
emphasis on the cross-section of the wires.

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. Observe the applicable
regulations in force in the country of installation.

Use the cable pathway provided, as shown in figure 1.

75 mm2.

Optional electrical connections

The electronic circuit board has a door on the front providing
access to terminal boards for optional wiring (see chapter
“Electronic Circuit Board” on page 22).

The connections in question are all low voltage or
potential-free.

Any wiring must be directed toward the exterior of the HIU,
using the pathways provided in the insulation and on the frame
(the one that is not used for routing the electric supply cable,
see figure 2).

All these lines can be routed through a single dedicated
raceway, separate from the 230 V electric cable one and
anyway separate from any other live cables.

Remote user interface connection

The HIU user interface has the dual function of control device
and room thermostat.

The remote user interface can be installed on cover of the HIU
or in the room in a position where the temperature
measurements will be of significance for control of the heating
function (in a heated room in a position where the temperature
read by the thermostat is not affected by any nearby heat
sources).

Installation on the cover of the HIU

If the remote user interface is fitted in the dedicated location
on the cover of the HIU, the thermostat function must be
disabled (in this case an external thermostat must be used, as
described in the next section).

The adjacent figures show how to install the remote control
unit:

• Feed the cable from the regulator through the hole in the

cover (3).

• Feed the cable from the regulator through the rear of the

interface (4).

• Connect the two wires to the terminals on the electronic

circuit board (the cable is not polarised) (5).

• Close the remote user interface and position it in its

housing on the cover (6), (7); if necessary, secure the
user interface from inside the cover by means of self
tapping screws and washers.

• Plug in the connector (8).

The thermostat function is enabled by default (refer to the
remote control user manual for disabling it).

9

SATK22

A

B

C

EXP PORT OTS RT

PREPAID

AUX

RS-485 BUS

Installation in the room

Use the cable outlet provided for connecting the remote user
interface to the electronic circuit board.

The chrono-thermostat function has to be enabled through the
remote control.

Refer to the dedicated user manual for the procedure.

Use of an external room thermostat

An external room thermostat, if installed, must be with
potential-free contact.

The external thermostat has to be connected to the terminals
“RT” shown in the adjacent figure.

The terminals can be accessed by removing the door on the
HIU electronic regulator (see page 22).

In case the thermostat function of the remote user interface is
enabled, any external thermostat will work in parallel
(management of different temperature zones).

Alternatively, when the thermostat function of the remote user
interface is disabled, the interface can be used to define the
hourly programming of the space heating function for all
thermostats connected to the terminal “RT”.

Refer to the user interface dedicated manual.

Commissioning

Filling the central heating system

Open the shut-off valves on the connections to the primary
heating system and the central heating system, proceed with
charging the system to the design pressure.

Once these procedures are complete, vent the system and
check the pressure again (repeat the filling process if necessary)

N.B. during the procedures for venting/draining the system use

suitable measures to avoid the risk of any liquid dripping onto
the electronic components.

Once these procedures are complete, vent the system and
check its pressure again (repeat the filling process if necessary)

N.B. during the procedures for venting/draining the system use

suitable measures to avoid the risk of any liquid dripping onto
the electronic components.

System start-up

Commissioning Continued

Fitting the cover

Fit the cover on the HIU by inserting the pins (A) in the
locations provided (B).

Secure the cover by tightening the 4 screws provided (C).

Before starting the HIU, visually check the hydraulic
connections for any signs of leakage and all the electric
connections.

After finishing the check, switch-on the electric supply to the
HIU and check for the presence of any error signal.

If there are any, eliminate the fault indicated (see page 26) and
proceed with setting the set point of the domestic water and
heating cycles, programming the remote user interface
according to the desired temperatures and times, and checking
the operating cycles.

10

SATK22

OFF

DHW only (“summer mode”) Heating + DHW (“winter mode”)

(mode)

DHW ON/OFF
Heating ON/OFF

(set)

Current time/date
Set point temperature
k outside temperature compensation

(day/night)

Daytime/night-time setting

(temp)

Temperature
display
(ambient set point
+ probes)

(prog)

Heating hourly
programming and
“comfort” function

(reset)

Resettable error reset

(R)

+/-

Current hours, minutes and day Daytime ambient temperature (*)

Night-time ambient temperature (*) Heating flow temperature

(SATK2210 & SATK2220)

DHW temperature

Remote User Interface Quick Guide

The digits in the centre of the display show the current ambient temperature, if the thermostat function is enabled.
In case the latter is disabled, the digits show DHW temperature and heating flow temperature when the HIU is in operation, “--.-”

when in stand-by.

Selecting the active services

(DHW/heating) Press the <mode> key
repeatedly to scroll through the
various available operating modes.

Selecting set points, current time and
comfort function

Press the <set> key repeatedly to set the
current time, set point temperatures and
comfort function. The value can be modified
by turning knob <R>.

11

SATK22

Primary limit/set return
temperature in DHW mode (**)

Comfort function (ON/OFF or
according to weekly program)

Primary limit/set return temperature
in Heating mode (**)

Current ambient temperature set
point (*)

DHW probe temperature

Heating flow probe temperature # Primary return probe temperature

# SATK2210 & SATK2220

Heat interface unit in OFF mode

Access to the technical parameters Technical parameter t00

Remote User Interface Quick Guide

(*) if the thermostat function of the remote user interface is enabled.
(**) if these set points cannot be changed you must set parameter t07 to value 0 in the technical menu (see “access to technical

menu” below). Parameter t07= 1 “freezes” the operating set points to prevent inadvertent modifications by the user.

Temperature display

Press the <temp> key repeatedly to display
the current ambient temperature set point
and the temperature values read by the
three probes of the HIU.

(*) if the thermostat function of the remote user interface is enabled.

Access to technical menu

Press the <mode> key repeatedly to set the
HIU to OFF status.

Hold the <set>, <day/night> and <temp>
keys pressed together for 10 seconds.

Once “TSP” appears on the display, confirm
access by pressing the central knob <R>.
By rotating knob <R> it is possible to scroll
through the various parameters, which can
then be edited, pressing and rotating knob
<R>.

To exit the menu, wait a few seconds or press the <reset> key. Re-enable the required services using the <mode> key.

Refer to the remote control user manual for the hourly programming of space heating and DHW comfort function.

12

SATK22

Heating Function

Heating flow temperature setting (SATK2210. and SATK2220.)

To set the flow temperature press the <SET> key until the
symbol in the red circle appears. Use the <R> knob to change
the value.

The flow temperature range is:

25–45˚C for SATK2210. (LOW temperature)

45–75˚C for SATK2203. (MEDIUM temperature)

Default Setting: set point regulation
(technical parameter t01 = 0)

When heating cycle activation is requested by the room
thermostat, the circulation pump is powered while the mixing
valve is opened gradually until the set point temperature is
reached. I

In the high temperature models (SATK2230 - SATK2240) the
valve is opened up to the maximum allowed (see Primary Flow
Rate Limitation on page 17)."

The circulation pump is stopped and the modulating valve is
closed at the end of the heating cycle. The heating cycle ON
condition is indicated by the blinking symbol.

OPTIONAL SETTING: primary return temperature limit
(technical parameter t01 = 1)

When heating cycle activation is requested by the room
thermostat, the circulation pump is powered while the mixing
valve is opened gradually until the set point temperature is
reached (in SATK2230 and SATK2240 the valve is open fully, up
to the maximum allowed), if the return temperature is lower
than or equal to the set limit value.

In case this condition is not met, in HIUs with control of the
flow temp.(SATK2210 and SATK2220) the flow temperature is
reduced (by a maximum of 15˚C in SATK2220, and maximum
3˚C in SATK2210, in order to bring return temperature within
the limit values.

In SATK2230 and SATK2204 a reduction of the heating flow
rate is operated. When the flow temperature/flow rate must be
reduced in order to limit return, the icon appears on the
display.

To set the flow temperature press the <SET> button until the
symbol in the green circle appears. Use the <R> knob to change
the value (*). The primary return limit temperature range is:

15–42˚C for SATK2210 - LOW temperature
30–70˚C for SATK2220 - MEDIUM temperature

Heating flow/ primary return limit temperature setting

To set the flow temperature press the <SET> key until the
symbol in the red circle appears; for the return temperature
limit press the key until the symbols in the green circle are
displayed. Use the <R> knob to change the value (*).

The flow temperature range is:
25–45˚C for SATK2210 - LOW temperature
45–75˚C for SATK2220 - in MEDIUM temperature

.

13

SATK22

Atmospheric Temperature T (˚C)

MIN

-5 0 5-15

MAX

10-10

302515 20

-20

k = 3.0

k = 2.5

k = 2.0

k = 1.5

k = 1.0

k = 0.5

k = 0.0

MAX is the set temperature value
MIN is 45°C for HIGH temp. HIUs, 25°C for LOW temp. ones.

Flow Temperature T (˚C)

Heating Function

OPTIONAL SETTING: modulating temperature regulation with
compensated set point (technical parameter t01= 2)
(SATK2210 & SATK2220)

When the function is enabled, the flow temperature is modified
(±10°C with respect to the set point for HIU in HIGH
temperature, ±3°C if in LOW temperature) according to the
temperature detected by the return probe in order to maintain
this latter temperature value constant.

This keeps the actual thermal output of the slab under control,
and consequently also the ambient thermal load. The thermal
response time of the system is thus minimised.

This feature should not be used in combination with
thermostatic radiator valves.

When the function is enabled the display shows the symbol

OPTIONAL SETTING: weather compensation (technical
parameter t01 = 3)

When the function is enabled, the flow temperature is
calculated based on the temperature detected by the outside
probe (optional), in accordance with the curve shown below.

The “k” coefficient can be changed by pressing <SET> button
until the related setting appears.

The display shows the symbol .

(*) if these set points cannot be changed you must set

parameter t07 to value 0 in the technical menu (see “access
to technical menu” below). Parameter t07 = 1 “freezes” the
operating set points to prevent inadvertent modifications by
the user.

14

SATK22

DHW Function

The DHW cycle always takes priority over the heating cycle.
DEFAULT SETTING: fixed DHW set point (parameter t06=0)

When DHW cycle activation is requested, due to DHW tapping
by the user (detected by the domestic water flow meter), the
regulator modulates the valve opening in order to adjust the
temperature detected by the domestic water probe to the
selected set point value. When tapping ends, the modulating
valve is fully closed.

The DHW cycle ON condition is indicated by the blinking
symbol.

OPTIONAL SETTING: primary return temperature limit
(technical parameter t06 = 1)

When DHW cycle activation is requested, due to DHW tapping
by the user (detected by the domestic water flow meter), the
regulator modulates the valve opening in order to adjust the
temperature detected by the domestic water probe to the
DHW set point value if the return temperature is less than or
equal to the set limit. If this condition is not met, the flow
temperature is reduced (by a maximum of 7°C down to a
temperature that can be no less than 40°C), in order to bring
return temperature within the limit values.

Due to the activation of the return temperature limitation
function, the DHW temperature can be lower than the set
value.

DHW/primary return limit temperature setting

To set the DHW temperature press the <SET> key until the
symbol in the red circle appears; for the return temperature
limit press the key until the symbols in the green circle are
displayed. Use the <R> knob to change the value (*).

The range of possible DHW temperatures is 42–60°C, while the
range of possible return temperatures is 15–45°C.

(*) if these set points cannot be changed you must set parameter t07 to value 0 in the technical menu (see “access to technical

menu” below). Parameter t07 = 1 “freezes” the operating set points to prevent inadvertent modifications by the user.

15

SATK22

DHW Comfort Function - Pre-heat, DHW Re-circulation

The comfort function can be, alternatively, preheating of the
DHW plate heat exchanger or management of DHW
recirculation. They are enabled by setting to ON or PROG the
comfort function (see page 12).

DEFAULT SETTING: DHW exchanger preheating function
(parameter t02 = 0) During periods when the domestic water

cycle is not used, if the DHW probe detects a temperature 10˚C
below the SET value, the regulator partially opens the domestic
hot water modulating valve for the time required (max. 5 min.)
to bring the exchanger to the condition wherein it can assure
rapid DHW production.

The active pre-heating cycle is indicated by the blinking
symbol. This function is of lower priority than any domestic
water or heating cycles.

OPTIONAL SETTING: management of DHW recirculation in the
apartment (parameter t02 = 1)

In alternative to the DHW comfort function it is possible to
manage DHW recirculation, using a similar logic. During
periods when the domestic water cycle is not used, if the DHW
probe detects a temperature 10˚C below the SET value, by
means of an auxiliary microswitch (see page 17), the regulator
closes the circuit supplying the circulation pump (not supplied)
generating a DHW cycle lasting for a pre-set amount of time.
This amount of time is pre-set to 2 minutes. It can be changed
by acting on parameter t09 on the technical menu (1 unit = 10
seconds).

The circulator has to be fed through the auxiliary microswitch
so that the control of recirculation is carried out by the heat
interface unit. DHW recirculation (t02=1) disables the other
functions operating on the auxiliary microswitch described on
page 17. Refer to page 17 for the electrical characteristics of the
microswitch.

Both comfort functions can be enabled according to user
defined weekly time programming. Refer to the remote user
interface manual

Anti-Legionella Function

DEFAULT SETTING: anti-legionella function OFF (technical
parameter t08 = 0)

Enabling the anti-legionella function by means of technical
parameter t08 = 1, in time band 3:00 - 3:30:

• the DHW set point will be temporarily increased to the

maximum value (60˚C) - the comfort/recirculation function
will be forced ON.

As a result of the temperature rise of the set point, at time 3:00
a comfort function (either pre-heating or recirculation) will be
triggered, bringing the temperature to a value close to 60˚C,
such as to rapidly reduce the presence of any bacteria.

During execution of the cycle, the user interface display will
show the blinking symbol (refer to the adjacent figure).

IMPORTANT!

• Any DHW production that occurs during the time band
(3:00 -3:30) will be at 60°C.

• The cycle execution time band (3:00 - 3:30) is established
in accordance with the time set on the remote control unit.
Incorrect time setting will result in execution of the
anti-legionella function in a different actual time band.

Due to the effect of exchanger thermal inertia, temporary
DHW production at high temperature could proceed also
beyond the time of 3:30.

If the function is enabled thermostatic mixing valves should
be installed on the users level (washbasin/shower, etc.).

16

SATK22

A maximum degree of opening (%) can be set via technical
menu parameter t03

Max opening (%)

Kv (m

3

/h)

706050 80 10090

0

0.25

0.50

0.75

1.00

1.25

1.50

1.75

2.00

A maximum degree of opening (%) can be set via technical
menu parameter t04.

Max opening (%)

Flow rate (l/h)

706050 80 10090

0

200

400

600

800

1000

1200

Primary Flow Rate Limitation

Primary flow rate limitation in heating mode.
DEFAULT SETTING: no limitation (technical parameter t03 =

100)

During start-up of the heating cycle from cold, e.g. on change
over from night-time ambient set point to the daytime set
point, the HIU may demand a significantly higher primary flow
rate than the design one, because of the low temperatures of
the secondary medium.

This effect is far greater with high temperature systems in
which, during the transient to the design operating condition,
high thermal power values may be transferred from the primary
circuit to the secondary circuit. This effect can be restricted by
lengthening the transient, setting a limit on the maximum
primary flow rate that can be withdrawn in heating mode.

The flow rate limitation is imposed by controlling the
maximum opening of the primary circuit modulating valve.

The relationship between the degree of opening (%) and Kv of
the circuit that connects the primary flow to the secondary
flow is shown in the graphs.

Primary flow rate limitation in DHW mode.
DEFAULT SETTING: no limitation (technical parameter t04 =

100)

Likewise, you can establish a limit to the primary flow rate that
can be tapped for instantaneous DHW production.

The flow rate limitation is imposed by controlling the
maximum opening of the primary circuit modulating valve.
Since latter is controlled by a differential pressure limiter, it is
possible to supply direct correspondence between the opening
position of the valve and the circulating flow rate (*).

N.B. Any limitation must be assessed in accordance with the

effective thermal characteristics of the residential unit served.

(*) The correspondence between valve position and flow rate is

indicative. Graphs obtained with pressure head upstream of the
HIU = 50 kPa.

17

SATK22

PERFORMANCE

2 s.

SELECTED SETTING

C

CURVE TYPE

PROPORTIONAL

PROPORTIONAL

PROPORTIONAL

CONSTAN T

FIXED SPEED

FIXED SPEED

FIXED SPEED

FIXED SPEED

CONSTAN T

CONSTAN T

LED SEQUENCE

CURVE T YPE LED SEQUENCE

CURVE T YPE LED SEQUENCE

ALARM STATUS

Blocked

Supply voltage low

Electrical error

H (m w.g.)

G (m

3

/h)

p (bar)

0.6

0.4

0.3

0.2

0.1

0

2.521.5

0.5

0.5

3.53

1

6

4

3

2

1

5

70.7

0.8 8

Constant head

Proportional head

Constant speed

Factory setting

Circulator - Curves and Settings

The HIU is equipped with a Grundfos circulator model UPM3
AUTO-L 15-70.

By default, the circulator setting is with the maximum
proportional head characteristic.

Pressing the front key briefly produces the sequence of LEDs
corresponding to the selected hydraulic characteristic. A couple
of seconds after pressing the key, the circulator again produces
a sequence of LEDs showing the instantaneous power
consumption:

• 1 yellow LED lit: power between 0 and 25% of P

• 2 yellow LEDs lit: power between 25 and 50% of P

• 3 yellow LEDs lit: power between 50 and 75% of P

• 4 yellow LEDs lit: power between 75 and 100% of P

To change the characteristic, hold down the front key for more
than two seconds and then press the same key repeatedly until
reaching the required characteristic (refer to the adjacent
figure).

Having identified the required characteristic (head - flow rate
chart shown below) wait for about ten seconds for the setting
to be accepted by the circulator, which will then revert to the
sequence of LEDs showing power consumption.

A long press of the front key (>10 seconds) locks the pump
setting, preventing possible incorrect modifications of the
curve.

Unlocking can be done in the same way, with a long press
(>10 s) of the front key.

max;

max;
max;

max.

The pump also has a self-diagnostics system to reveal any
possible operating problems.

Any problem detected is shown by a sequence of LEDs:

18

SATK22

Auxiliary Microswitch

The HIU is equipped with a contact, driven by a relay
incorporated in the circuit board, the intervention logic of
which can be programmed in accordance with requirements by
setting technical parameter t05.

Each event linked to operation of the HIU is linked to a
numerical value, according to the following table:

Events - Conditions Value

DHW tapping in progress 1

Heating cycle in progress 2

Comfort cycle (pre-heating/recirculation) in progress 4

HIU OFF 8

Error not active 16

Error active 32

Closing of the contact on the occurrence of multiple events
conditions is programmed by setting parameter t05 to a value
corresponding to the sum of the single events/conditions.

We give some practical examples below:

example 1 - Driving an external primary flow pump, normally
OFF.

The contact must be closed if any HIU function is active (DHW
production, heating, pre-heating)

Parameter t05 must be set to: 1 + 2 + 4 = 7

example 2 - Distinction of consumption for DHW production
from total consumption (in combination with heat meter
equipped with dedicated function)

The contact must be closed both if DHW tapping is in progress
and if activation of the comfort function is requested
(pre-heating or recirculation).

Parameter t05 must be set to 1 + 4 = 5.
Closing of the microswitch is shown on the user interface by

the symbols shown alongside.

N.B. if the DHW recirculation function is enabled with t02 = 1
(see page 16) the auxiliary microswitch intervention logic
described above is not operational. In this case, the contact is
used to control the recirculation pump.

Connection

For information on how to access the dedicated terminals,
consult the “Electronic Circuit Board” section on page 22.

N.B.: the auxiliary microswitch can be used to drive electric
loads directly, taking account of the following operating limits:

Max. voltage: 230 V ac
Max.current: 3 A

If the electric load to be controlled is not included within the
parameters indicated an external relay must be interposed.

19

SATK22

To the ModBus
master

RS-485

MASTER
IN / OUT

SLAVE # 1

IN / OUT

SLAVE # n

IN / OUT

CHARACTERISTIC

IMPEDANCE = Z0

TERMINATI NG

RESISTOR

R

T=Z0

TERMINATI NG

RESISTOR

R

T=Z0

KEEP AS SHORT AS POSSIBLE

Modbus

The HIU offers a remote connectivity solution by means an
RS-485 wired network and Mod-Bus communication protocol.

On request, Altecnic will supply a map of the Mod-Bus registers
and data transmission specifications so the product can be
integrated in an existing BMS system.

The RS-485 communication network should be preferably
constructed in compliance with the prescriptions of standard
EIA RS-485.

Any other configuration of the physical layer is at the discretion
of the BMS system operator, which will assume responsibility
for checking the implications in terms of transmission quality.

In particular, it is essential to use a two-wire twisted cable.
Compliance with this requirement becomes even more
significant the more extensive the RS-485 network.

If, alternatively, a shielded wire is used, the shield must be
connected solely on the master side.

As a guideline, take account of the following general
prescriptions to ensure optimal transmission quality:

• use a BUS cable with impedance of around 120 Ohm;

• connect a terminal resistor, having same impedance as the

cable, at each end of the RS-485 cable;

• keep the length of side branches as short as possible.

The device is configured by default to support a
communication speed of 9600 baud/s with parity “none”.

The communication speed can be changed via Modbus, to the
following values: 2400, 4800, 9600, 19200 baud/s.

20

SATK22

Safety and Alarms

If the electronic circuit board detects a fault, the display shows
the error code concerned and the symbol .

Heating probe fault (SATK2210 & SATK2220)
Error code: 5

Domestic water probe fault
Error code: 6

Return probe fault
Error code: 15

Return probe fault
Error code: 15

Safety thermostat cut-out (SATK2210)
Error code: 69

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.

After the user has removed the block imposed by the safety
thermostat, operation can only be re-enabled when the
modulating valves are completely closed again.

This means that if a domestic water cycle is in progress, the
activation of the shut-off valve will be postponed until the
end of that domestic water cycle.

Corrective action

To restore the operating mode press the manual RESET
button.

Corrective action

Normal operating conditions are restored automatically once
the faulty probe is working properly again (see page 25 ­“Temperature probe replacement”).

Thermal safety solenoid valve (SATK2210)
Error code: 76

Corrective action

Normal operating conditions are restored automatically once
the faulty safety valve works properly again.

Heat interface unit disabled
Error code: 80

The HIU is disabled due to an incorrect connection on the
circuit board front terminals or due to an input from an
external device indicating zero credit.

Corrective action

Check the electrical connections or, in the case of zero credit,
top-up the external device/contact the service supplier.

21

SATK22

OTS RT

PREPAID

AUX

RS-485 BUS

250Vac 3A

max

OTS RT

IN IN IN O

RT

P

IN IN O

PREPAID

IN O

AUX

????????

OUT

RS-485 BUS

DHW probe:

Return probe:

Heating probe:

Heating valve actuator probe:

DHW valve actuator probe:

Safety thermostat:

Electronic Circuit Board

Optional connections

The electronic circuit board has a front door (shown in the
adjacent figure) that provides access to the connectors related
to HIU optional functions.

N.B. before working on the circuit board you must disconnect
the electric supply to the HIU.

All the terminals are mounted on removable connectors to
facilitate wiring operations.

The following services are accessible:

• External probe for outside compensated
temperature regulation

Use optional probe code 789833

• External room thermostat

IMPORTANT! The connection is volt free. Do not
connect powered contacts.

• Interface with pre-paid services

In case the HIU has to be interfaced with controllers
PREPAID managing the heating and DHW
production services by means of “pre-paid” type
logic.

The HIU interprets an open contact as “credit
available”. Closing the contact disables the heating
and DHW production services. When this condition
occurs the user interface display shows error “E80”.

IMPORTANT! The connection is volt free.
Do not connect powered contacts.

If the controller that manages the pre-paid service
supplies a powered contact, a relay must be
interposed.

Auxiliary contact

To implement the functions described on page 19 and
for the connection of the DHW recirculation pump
(see page 16)

IMPORTANT! Max. voltage 230 V ac, max. current 3 A.

• Mod-Bus

RS-485 port to connect HIU to a wired
network for Mod-Bus communication.

Connector colours

If the connectors of actuators and temperature probes are
disconnected during special maintenance work, comply with
the following instructions to reconnect them:

Other electronic regulating functions

• Reset modulating/mixing valve to zero

Immediately after the power supply has been switched on,
the position of the modulating valves is reset to zero.

• 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 valve anti-seizing cycle

The anti-seizing cycle for the diverter/modulating valve is
run every 24 hours.

22

SATK22

Periodic Maintenance

The following checks must be carried out at least once very 12 months, in accordance with the prescriptions of standard EN 806-5.

Operations to be Performed

Force an actuators reset by switching the HIU power supply OFF and then ON

Visually check for the absence of leaks and/or anomalies

Check for possible active errors shown on the user interface

Test correct operation of the pump by closing the thermostat contact or forcing it to close

Clean the strainers: on the primary flow line, on the secondary return line, upstream of the domestic water flow meter.

Check for the absence of internal leakage through the modulating valves when none of the services are active

Check correct setting of the set points (DHW and heating). Unless explicitly requested by the user or for normative reasons, a DHW temperature

set point of 50˚C or lower is recommended

With the primary circuit at working temperature, check that the DHW flow rate at the correct temperature is sufficient

Summary of the technical parameters

Here follows a summary of the meaning and possible settings of the technical parameters:

Parameter Meaning Setting

t00 Not used -

0 = fixed set point

t01 Heating flow temperature control

t02 DHW comfort mode

t03 Maximum % opening of the heating modulating valve From 50 to 100

t04 Maximum % opening of the DHW modulating valve From 50 to 100

t05

t06 DWH temperature control

t07 Some settings are frozen

t08 Anti-legionella

t09 Duration of the DHW re-circulation cycle 1 unit = 10 seconds

Configuration of the closing logic of the auxiliary

microswitch

0 = all temperature settings can be modified

1 = fixed set point with RTL

2 = compensated on return temperature

3 = weather compensated

0 = pre-heating of the heat exchanger

1 = DHW re-circulation

See page 19

0 = fixed set point

1 = return temperature limits are frozen

1 = return temperature limits are frozen

0 = disabled

1 = enabled between 3:00 to 3:30 am

23

SATK22

AA

AA

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:

• Switch off the electricity supply

• Remove the cover

• Close the shut-off valves

• Empty the heat interface unit using the drain cocks provided.

Exchanger replacement

• As a preliminary step, remove the flow sensor (refer to

“replacing the DHW priority flow meter”) and position it
where it cannot be reached by any dripping liquid.

• Remove the exchanger, loosening the 2 hex socket head

screws fixing it in place (A)

• Replace the exchanger and the ‘O’ rings.

• Tighten the two fixing screws (A) after having checked that

the ‘O’ rings are correctly positioned. Tightening torque 3 to

3.5 Nm

N.B. Make sure to respect the correct orientation of the plate

heat exchanger when re-fitting it.

24

SATK22

G

H

F

F

CC

CC

B

D

E

Cleaning the HIU primary circuit strainer

All heat interface units have a strainer on the inlet for water
from the centralised system.

To clean these strainers, carry out the following maintenance
procedure:

• Unscrew the cap (B)

• Remove the strainer mesh and discard any impurities it

contains

• Refit the strainer mesh

• Refit the cap and tighten it.

Temperature probe replacement

• Disconnect the probe cable by bending tab (C) slightly and

extracting the connector.

• Unscrew the probe

• Fit the new probe

• Reconnect the connector respecting the only possible way it

can be inserted.

Replacing the actuator

• Disconnect the valve actuator (see previous paragraph)

• Extract the obturator, unscrewing the locking nut (F)

• Replace the actuator, screw on the locking nut (F) and then

fit the actuator

• Insert the fixing clip, respecting the correct direction

• Reconnect the connector.

Replacing the DHW priority flow switch

• Disconnect the flow meter cable acting on the connector

• Extract the flow sensor (G)

• Position the new sensor

• Re-connect the connector respecting the only possible way

it can be inserted.

Replacing the valve obturator

• 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 or cleaning the DHW priority flow meter turbine

• Extract the flow sensor

• Unscrew and remove the cartridge (H)

• Remove any impurities or change the cartridge if necessary

• Screw the cartridge back in

• Reposition the flow sensor

When carrying out maintenance on the electrical part, follow
the connectors illustrated on page 20.

After concluding maintenance, proceed with the filling and
checking operations described in the chapter “commissioning”
(page 9) re-fit the cover.

If you require any information regarding spare parts, please
contact Altecnic Limited.

25

SATK22

Fault Finding

Fault Indications Possible Cause of Fault Operations to be Performed

primary circuit isolating valve closed open the isolating valve

The water is not

heating

The water is hot but

does not reach the

desired temperature

The hot water

temperature reached

is too high

Hot water flow rate

is insufficient

modulating valve actuator disconnected from valve body

modulating valve actuator faulty call qualified personnel to have it replaced

blinking

icon

error code 6 active

error code 80 active incorrect wiring/no credit check electrical connections/top-up credit

constant

icon

Icon absent

display off

blinking

icon

blinking

icon

blinking

icon

DHW temperature probe cable inverted with heating probe

presence of air in the system vent the system

electronic controller not working call qualified personnel to have it replaced

valve obturator blocked in closed position call qualified personnel to have it replaced

centralised system not working contact person in charge of system

DHW temperature probe disconnected re-connect probe

DHW temperature probe faulty call qualified personnel to have it replaced

DHW priority flow meter disconnected re-connect flow meter

DHW priority flow meter faulty call qualified personnel to have it replaced

DHW production disabled enable DHW by means of HIU interface

electricity power supply switched off switch on electricity supply

protection fuse burnt out call qualified personnel to have it replaced

domestic water cycle temperature set point too low increase set point

primary return temperature limitation intervention

primary circuit strainer of HIU clogged call qualified personnel to have it serviced

exchanger partly clogged call qualified personnel to have it serviced

modulating valve actuator faulty call qualified personnel to have it replaced

modulating valve actuator connector disconnected re-connect actuator connector

DHW temperature probe cable inverted with

heating probe

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

primary flow rate limit too low contact person in charge of system

domestic water cycle temperature set point too high decrease set point

DHW temperature probe cable inverted with

heating probe

modulating valve actuator faulty call qualified personnel to have it replaced

valve obturator blocked in intermediate or open position

electronic controller not working call qualified personnel to have it replaced

primary circuit excessive flow rate due to DPCV valve

malfunctioning

anti-legionella cycle in progress contact person in charge of system

HIU strainer clogged call qualified personnel to have it replaced

possible domestic water system shut-off valves

partly closed

insufficient pressure in central domestic water circuit

call qualified personnel to have it replaced

call qualified personnel to have it replaced

call qualified personnel to have it serviced

re-connect actuator

restore correct connection

change the return temperature set

point/disable the function

restore correct connection

restore correct connection

open the valves

26

SATK22

Fault Finding

Fault Indications Possible Cause of Fault Operations to be Performed

possible domestic water system shut-off valves closed open the valves

There is no hot

water flow

The room is not

reaching the desired

temperature

DHW led off

blinking

icon

constant icon

display off

icon absent heating not enabled (summer mode)

error code 5 active heating temperature probe faulty call qualified personnel to have it replaced

error code 15 active compensation temperature probe faulty call qualified personnel to have it replaced

error code 38 active external temperature probe faulty/ not connected call qualified personnel to have it replaced

error code 69 active safety thermostat cut in call qualified personnel to have it serviced

error code 76 active thermal safety solenoid valve faulty call qualified personnel to have it serviced

error code 80 active no credit top-up prepayment system

no cold water in centralised domestic circuit call qualified personnel to have it serviced

HIU strainer completely clogged call qualified personnel to have it serviced

heat exchanger completely blocked call qualified personnel to have it serviced

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

primary return temperature limitation intervention

(the following icon appears )

primary flow rate in heating mode set at an excessively

low limit

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 restore correct connection

DHW temperature probe cable inverted with

heating probe

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

thermostat function enabled on the remote interface

when it should be disabled

timer/thermostat time setting incorrect check programming of timer/thermostat

timer/thermostat not working check timer/thermostat

thermostat function disabled on the remote interface contact person in charge of system

electric supply switched off restore HIU electric supply

protection fuse burnt out call qualified personnel to have it replaced

change the return temperature set

point/disable the function

change heating valve open limit

restore correct connection

contact person in charge of system

enable heating by means of heat interface

unit

27

SATK22

Commissioning Check List

Item Checks to be Performed Completed

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 data logger (if required)?

6 Is the DCW line fitted with a pressure reducing valve?

7 Are the shut-off valves open?

8 Has the visual inspection of the hydraulic sealing efficiency produced positive results?

9 Has the system (primary) been filled and vented?

10

11 Is the heat interface unit connected to the 230 V ac electric supply? Is the remote user interface connected?

12

13

14 Have the heating, DHW and comfort functions (if required) been activated?

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?

Have the optional connections (external sensor, prepayment, auxiliary microswitch, Modbus, if required)been
carried out?

Has the remote user interface been configured for installation on board (thermostat function disabled)/inside
the apartment (with thermostat function enabled)

15 Have the heating and DHW set points been configured correctly (when applicable)

16

17 Have the external room thermostats (if required) been connected?

18 No error code on heat interface unit remote user interface?

19 Is the primary circuit at working temperature?

20 Check that heating starts (blinking icon) by simulating a heating request

21

22

23

Have the optional functions (return temperature limitation, return/weather compensation, anti-legionella,
primary flow rate limitation) been enabled (if required) and configured?

Check that the pump functions correctly when the thermostat is activated (check that the secondary flow pipes
heat up)

Simulate minimal DHW tapping (approx 3 l/min) and check that “DHW” LED lights and that water is supplied at
the required temperature

Simulate abundant DHW tapping and check, by means of the installed heat meter, that the primary circuit flow
rate is sufficiently high

28

SATK22

Caleffi group

Altecnic Ltd Mustang Drive, Stafford, Staffordshire ST16 1GW
T: [phone] E: [e-mail]

Registered in England No: 2095101

altecnic.co.uk

IOM 106 23-02-18

E & O.E

©Altecnic Limited. 2018

™

ALTECNIC