TERMOSTROJ TermoMini Guide

ELECTRIC BOILERS FOR CENTRAL HEATING
TermoMini
Installation manual
User guide

TMS-UT-0416-T01-0
INSTRUCTIONS FOR INSTALLATION
We reserve the right of alternations.
Contents
General................................................................................................................................. 1
1. Introduction ....................................................................................................................... 1
1.1. Applicable documents................................................................................................. 1
1.2. Retention of documents.............................................................................................. 1
1.3. Introduction................................................................................................................. 2
1.4. Frost protection........................................................................................................... 2
2. Boiler specifications........................................................................................................... 2
2.1. Dimensions in mm ...................................................................................................... 2
2.2. Elements of TermoMini............................................................................................... 4
3. General requirements........................................................................................................ 5
3.1. Contents included in delivery ...................................................................................... 5
3.2. Preliminary remarks.................................................................................................... 5
3.3. Installation site............................................................................................................ 5
3.3.1. Position of a boiler................................................................................................ 5
3.3.2. Power supply........................................................................................................ 6
3.4. System requirements.................................................................................................. 6
3.4.1. Pipe work.............................................................................................................. 6
3.4.2. Cleansing and flushing the system ....................................................................... 6
3.4.3. Filling and preparing heating system .................................................................... 7
3.4.4. Pressure relief valve............................................................................................. 7
3.4.5. Pressure gauge.................................................................................................... 7
3.4.6. Expansion vessel.................................................................................................. 7
3.4.7. Circulating pump................................................................................................... 7
3.4.8. Air in boiler ........................................................................................................... 7
4. Boiler installation sequence............................................................................................... 8
4.1. Transporting the appliance.......................................................................................... 8
4.2. Select position for boiler.............................................................................................. 8
4.3. Fitting the boiler hanging bracket ................................................................................ 8
4.4. Removing/fixing the front and top case ....................................................................... 9
4.5. Power supply connection............................................................................................ 9
4.6. Connecting temperature sensors or external electrical controls .................................10
4.6.1. Accessing connection plate.................................................................................10
4.7. Filling the heating system...........................................................................................10
5. Commissioning.................................................................................................................10
5.1. Heating system check................................................................................................10
5.2. Preliminary electrical check........................................................................................10
5.3. Pump.........................................................................................................................11
5.4. Working with standard control panel ..........................................................................12
5.4.1. Heating functions.................................................................................................14
5.4.2. Access to special service menu...........................................................................15
5.4.3. Control panel “Z” – OPTION................................................................................16
6. Maintenance.....................................................................................................................17
6.1. Periodic checking.......................................................................................................17
6.2. Cleaning.....................................................................................................................17
7. Survey of possible malfunctions and irregularities in operation.........................................18

TMS-UT-0416-T01-0
INSTRUCTIONS FOR INSTALLATION
We reserve the right of alternations.
Figures
Figure 1 TermoMini dimensions, flow and return positions .................................................... 2
Figure 2. Expansion vessel and power supply characteristics ............................................... 3
Figure 3. TermoMini elements............................................................................................... 4
Figure 4. Contents included with delivery .............................................................................. 5
Figure 5. Minimal distances for installing the boiler................................................................ 6
Figure 6. Wall mounting......................................................................................................... 8
Figure 7. Removing front and top case.................................................................................. 9
Figure 8 Power supply connection......................................................................................... 9
Figure 9 Connection relay plate............................................................................................10
Figure 10 Pump NMT PLUS 25/40.......................................................................................11
Figure 11 Pump characteristics............................................................................................12
Figure 12 Standard electronic control panel .........................................................................12
Figure 13 Control panel “W” - OPTION.................................................................................16
Figure 14 Hydraulic sketch for TermoMini with OPTION control panel type “Z”....................16
Tables
Table 1. Expansion vessel characteristics............................................................................. 3
Table 2. Power supply characteristics ................................................................................... 3
Table 3. List of TermoMini elements...................................................................................... 4
Table 4. Table of contents included with delivery................................................................... 5
Table 5. Pump electric and performance information............................................................11
Table 6. Pump general information.......................................................................................11
Table 7 Possible malfunctions..............................................................................................19

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General
•Keep these instructions close to the boiler!
•The boiler must not be modified, changed or rebuilt.
•The correct settings are important for economical heating.
•The type and serial number of the boiler must be quoted whenever you contact
manufacturer or service, see the identification plate.
General safety instructions!!
- Children shall not play with the appliance.
- Cleaning and user maintenance shall not be made by children without supervision.
- Children should be supervised to ensure that they do not play with the appliance.
- Boiler is not intended for outdoor use.
Technical safety instructions!!
- Keep the water pressure between recommended limits –see chapter 3.4.3, page 7.
- Do not install boiler close the heat source (for instance, fireplace, wood stove etc…).
- Incompetent repairs can cause serious danger to users.
- Defective parts may be replaced only by the original or approved by the
manufacturer,
- Switch off main power by MCB before opening the boiler.
- Boiler has built-in frost protection. When the boiler is not in use, leave the main power
active that protection stay active.
1. Introduction
Thank you for the confidence you have shown to us by purchasing our central heating boiler.
In order to use the boiler to the utmost correctly and safely, and above all economically, read
thoroughly these instructions before continuing with installation.
A competent person, who is responsible for adhering to the existing regulations, rules and
guidelines, must install the appliances.
1.1. Applicable documents
The following additional documents are provided with the appliance:
For the owner of the system:
Instructions for use
Warranty card
For the qualified technician:
Instructions for installation
Electrical drawing for the appliance
1.2. Retention of documents
Please pass on this manual to the owner of the system. The owner should retain the
manuals so that they are available when required.
Read this document carefully before carrying out any installation,
adjustment or service and follow the instructions

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1.3. Introduction
TermoMini boilers are economical central heating boilers that can be used as an
independent or additional source of heat.
TermoMini boilers offer you a possibility to reduce the power of the heater if necessary. The
power can be easily reduced through the control panel. This way it is possible to adapt the
boiler to the utmost to circumstances on the spot.
The boiler operates on a principle of rapid heating smaller water quantities, so that exploiting
energy is already 100%.
TermoMini boilers are used for radiator and floor heating. Temperature operation area is
from 20°C to 90°C. TermoMini boilers are designed in such way that in apartment-contained
central heating they can fit well with your furniture.
1.4. Frost protection
The software in control panel provides boiler frost protection. When frost protection is
controlled for entire central heating system by room thermostat, please consult room
thermostat manuals for more details.
2. Boiler specifications
2.1. Dimensions in mm
Figure 1 - TermoMini dimensions and flow and return positions

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Table 1. Expansion vessel
characteristics
Volume of Expansion
Vessel
[L]
6
Maximum Expansion
Vessel Pressure
[MPa (bar)]
0,3 (3)
Filling Pressure
[MPa (bar)]
0,10 (1,0)
Maximum Pressure
In the Heating System
[MPa (bar)]
0,3 (3)
Height Of the Central
Heating System
[m]
4
Effective Capacity Of
Expansion Vessel
[L]
3,0
Adsorption Capacity
[%]
50
Maximum Amount of
Water in the System
[L]
86
Table 2. Power supply characteristics
Power
[kW]
230 V~N
400V 3N ~
50/60 Hz
3
4,5
6
9
9
12
Nominal
current
[A]
13
19,6
26,1
39,2
13,1
17,5
Fuse
current
[A]
16
25
32
50
16
25
Rated
short-
circuit
breaking
capacity Icn
(EN 60898)
[kA]
10
10
10
10
10
10
Rated
short-
circuit
breaking
capacity Icn
(IEC 947-2)
[kA]
15
15
15
15
15
15
Min.
conductor's
cross-
section
[mm2]
3x2,5
3X4
3X6
3X10
5X2,5
5x4
Fuse type
B16
B25
B32
B50
B16
B25
RCCB
switch type
[A]
25/0,03
25/0,03
40/0,03
63/0,03
25/0,03
25/0,03
Figure 2. Expansion vessel and power supply characteristics

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2.2. Elements of TermoMini
Power connection protection cover
Figure 3 - TermoMini elements
Table 3. List of TermoMini elements
1. Primary flow
10. Expansion vessel
2. Return flow
11. Circulation pump
3. External boiler shell
12. Pressure relief valve (0,3 MPa / 3 bar)
4. Boiler
13. Automatic air vent
5. Heat insulation
14. Charge and discharge valve
6. Electrical heaters
16. Air-indicator
7. Control panel
17. Manifold
8. Inducers for el. connections
9. RCCB switch and relays

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3. General requirements
3.1. Contents included in delivery
TermoMini boilers are delivered pre-mounted in a package unit. Make sure that all parts have
been delivered intact. For the exact list of parts, see the figure and table below. If parts are
damaged or missing, please consult our local sales office.
Figure 4 - Contents included with delivery
Table 4. Table of contents included with delivery
Item
Quantity
Description
1
1
TermoMini boiler
2
1
Instructions for installation and use
Electrical drawing
Warranty card
3
1
Hanging bracket
3.2. Preliminary remarks
When connecting the appliance to the fixing wiring, the means for disconnection (MCB) must
be incorporated in fixing wiring in accordance with the local wiring rules.
If the boiler is out of function during wintertime, there is a danger of installation freeze. In this
case, boiler should be filled with antifreeze liquid for central heating. If this is not possible
water should be drained out of the system with the help of charge and discharge valve.
Recommended pressure of central heating installation is between 0,12 MPa (1,2 bar) and
0,15 MPa (1,5 bar), maximum pressure is 0,25 MPa (2,5 bar).
3.3. Installation site
3.3.1. Position of a boiler
The location must provide adequate space for servicing and air circulation around the boiler.
The boiler can be installed in any room, although particular attention is drawn to the local
regulations in respect to the installation of a boiler in a room containing a bath or a shower.
The boiler must be mounted on a flat, vertical wall, which must be sufficiently robust to bear
the weight of the boiler. The boiler can be installed on a combustible wall, subject to the
requirements of the Local Authorities and Building Regulations.

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Following figure shows the recommended minimal distances.
Figure 5 - Minimal distances for installing the boiler
It is possible to reduce recommended minimal distances, but the following requirements must
be met:
Power supply connection, located at bottom of boiler must be accessible
Bottom part of boiler must be accessible to allow change of heater
Control panel on bottom side of boiler must be accessible
Basic air circulation must be maintained.
3.3.2. Power supply
The boiler is rated as a high-power appliance and fixed wiring must be used. Please observe
chapter 2.2. about fuse and conductor requirements. When connecting the appliance to the
fixing wiring the means for disconnection (MCB) must be incorporated in fixed wiring in
accordance with the local wiring rules.
RCCB (RCD) switch 0,03A sensitivity is fitted inside a boiler.
Note:
In some cases, additional measures must be taken, subject to the requirements of the Local
Authorities.
3.4. System requirements
3.4.1. Pipe work
Pipe work that is not a forming part of the useful heating surface should be insulated to help
prevent heat loss and possible freezing, particularly where pipes are run through roof spaces
and ventilated under floor spaces. Draining taps must be located in accessible positions,
which permit the draining of the whole system including the boiler and the hot water system.
3.4.2. Cleansing and flushing the system
Flushing of system is highly recommended this will prevent damage to the appliance made
by dirt from the system.

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3.4.3. Filling and preparing heating system
The system can be filled using the built-in filling valve or via a separate filling point fitted at a
convenient position on the heating circuit. The connection must be removed when filling is
completed. Where local Water Authority regulation does not allow temporary connection, a
sealed system filler pump with break tank must be used. The heating system will not be filled
automatically from the domestic hot water side.
Note:
For the heating system to operate properly the indicator of manometer must be between 1,2
and 1,5 bar when system is cold. Maximum pressure is 2,5 bar and minimum 0,8 bar. It is
very important to use soft water or fluids for central heating.
Do not fill the system with water from private source.
3.4.4. Pressure relief valve
A pressure relief valve is provided with the boiler. This safety device is required on all sealed
heating systems and is preset at 0,3 MPa (3 bar). The pressure relief valve must not be used
for draining purposes.
3.4.5. Pressure gauge
This is factory fitted to the TERMO-Mini boilers and indicates the primary circuit pressure to
facilitate filling and testing.
3.4.6. Expansion vessel
TermoMini boiler incorporate an expansion vessel. Refer to chapter 2.2for more information
about incorporated expansion vessel.
If the nominal capacity of the built-in expansion vessel is not sufficient for the heating system
(for instance in the case of modernization of old open systems) an additional expansion
vessel can be installed externally to the boiler. It should be fitted in the return pipe as close
as possible to the boiler.
3.4.7. Circulating pump
The circulation pump is included in TermoMini boilers. The following figure represents pump
characteristics - see chapter 5.3.
3.4.8. Air in boiler
Boiler is fitted with the air detector that will stop boiler in the case of air presence.

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4. Boiler installation sequence
4.1. Transporting the appliance
Important:
The following lift operation exceeds the recommended weight for a one-man lift.
General recommendations when handling
Clear the route before attempting the lift. Safe lifting techniques are used –keep back
straight –bend using legs. Keep load as close to body as possible. Do not twist –reposition
your feet. If two persons are performing the lift, ensure coordinated movements during lift.
Avoid upper body/top heavy bending - do not lean forward/sideways. It is recommended to
wear suitable cut resistant gloves with good grip to protect against sharp edges and ensure
good grip. Always use assistance if required.
Positioning of Appliance for Final Installation
Fit bracket securely onto wall before lifting appliance into position. Ensure that stable balance
is achieved and lift upwards to drop into place onto bracket. Ensure coordinated movements
during a two-person lift to ensure equal spread of weight of load it is recommended to wear
suitable cut resistant gloves with good grip to protect against sharp edges and ensure good
grip when handling appliance.
4.2. Select position for boiler
Refer to chapter 3.3.1. for information regarding the appliance position. In general, the boiler
must be positioned in such manner that:
•There is enough space around the boiler for service and maintenance
•There is no chance for boiler to be submerged into water
•There is no chance for boiler to be poured with significant amount of water
•Normal level of air circulation can be maintained
•All necessary pipe work can be connected
4.3. Fitting the boiler hanging bracket
Fix the hanging bracket (2) to the wall (1) using the plugs and M8 or M10 screws. Lift up
boiler (3) above hanging bracket (2), gently lean it to the wall (1) and slide it down to the
hanging bracket (2).
Figure 6 - Wall mounting

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Note:
If the boiler is to be fitted in a timber framed building, ensure that the bracket is secured to a
substantial part of the timber frame capable of bearing the weight of the boiler.
4.4. Removing/fixing the front and top case
Figure 7 - Removing front and top case
Grasp the front case by its sides, pull it towards the front and remove it by lifting it of the unit,
push top cover towards back and lift it of the unit.
4.5. Power supply connection
Note:
Before working with the appliance, turn off the power supply (MCB) and secure against
restart.
This device must be earthed.
Tightening torque for RCCB is 2,5 Nm.
Figure 8 - Power supply connection

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4.6. Connecting temperature sensors or external electrical controls
4.6.1. Accessing connection plate
In order to access connection plate, power connection protection cover (Figure 2) must be
removed by unwinding two screws M4 and pulling protection cover out.
Figure 9 - Connection relay plate
4.7. Filling the heating system
For the heating system to operate properly the indicator of manometer must be between 1.2
and 1.5 bar when the system is cold. It is very important to use soft water or fluids for central
heating.
5. Commissioning
5.1. Heating system check
Check for pressure in the system, it should be from 0,12 MPa (1,2 bar) to 0,15 MPa (1,5 bar)
when the system is cold. Vent all heating elements and installation.
5.2. Preliminary electrical check
Check if power cable is tightened on RCCB (RCD) terminals
Check the presence of phase on RCCB (RCD) input terminals inside boiler

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If the exact measured voltage between L and N lines is more than 10% higher than nominal
voltage on the appliance, the appliance itself can be damaged.
Test the RCCB (RCD) switch by pressing T button on it
5.3. Pump
The pump impeller is made of noryl. Pump casing is made of grey cast iron. Embodiment of
the casing is single made.
Figure 10 - Pump NMT 25/40
Table 5. Pump electric and performance information
Table 6. Pump general information
Max. flow, Qmax
[m3/h]
2,6
Medium temperature [°C]
5-95
Max. height, Hmax [m]
4
Ambient temperature [°C]
0-40
Default pressure
[bar]
10
Recommended system
pressure at 50/80/110 °C
[bar]
0,05/0,4/1,1
Power [W]
5-25
Current [A]
0,05-0,2
Voltage [V]*
230
Insulation class
F
Protection level
IP44
* single-phase

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Figure 11 - Pump characteristics
5.4. Working with standard control panel
Figure 12 - Standard electronic control panel

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1. Thermal fuse (STB)
2. Multipurpose –temperature indicator (temperature of boiler,
adjustment of temperature)
3. Signalization of operation degree of heaters (1, 2, 3)
4. Pressure indicator
5. Switch for central heating switching on and off
6. Adjustment of temperature in boiler
7. Signalization of boiler operation (green light)
Switching on of central heating
By switching the switch (5) to the position 1, the central heating system is switched on. Upon switching
on the desired water temperature in boiler is displayed for 5 seconds, signalization of boiler operation
is twinkling (7). After 5 seconds the real temperature in the boiler is displayed (2); if the current
temperature in the boiler meets the desired one, the signalization lamp of the boiler operation (7) is
switched off.
Adjustment of desired temperature of central heating
By pressing the key for temperature adjustment (6) the desired temperature in the boiler appears, the
signalization lamp of the boiler operation (7) is twinkling. By repeated pressing upwards or downwards
it is possible to increase or decrease the desired water temperature. When the temperature is adjusted
it is sufficient to wait for 5 seconds (signalization lamp of the boiler operation (7) does not twinkle) in
order for the boiler to memorize new temperature.
Air in the boiler ‘’LU’’
If air appears in the boiler, the signalization of air in the boiler ‘’LU’’ is shown on display (2) and the
boiler stops the operation. In this way the boiler is protected against burning through because of
appearance of air. To continue the operation, the boiler should be vented. If the boiler is correctly
vented, the operation of boiler continues automatically.
Voltage drop ‘’SP’’
If the voltage in the network line drops below 180V by phase, the signalization of under voltage
protection ‘’SP’’ is shown on display (2), the boiler automatically switches off in order to protect
electronics and contactors inside the boiler. The boiler will automatically continue the operation when
the network voltage reaches values above 180V.
Cutout thermostat - turning on
Cutout thermostat (safety thermostat) (1) protects the boiler against rapid increase of temperature
above 115°C. The fuse turns off the boiler and ejects the RCCB (RCD)-switch.
To continue the operation, it is necessary to take off the protection cover from the cutout thermostat
and press the red key, after which the RCCB (RCD)-switch should be switched on again.
NOTE:
If the room thermostat is on, check if it is set at the necessary room temperature and if
supply batteries are in order, otherwise the boiler will not operate.
.
46.
46
Red dot in lower right corner of display is showing - boiler is off on control panel but main power
(RCCB switch) is in ON position
Display is showing real temperature in boiler - red dot is illuminate
Display show settings parameter during programming - without red dot
Clarification of LED display layout

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5.4.1. Heating functions
Display of desired temperature in the boiler
If the key (6) is held pressed less than 5 s the LED display will show the desired
temperature in the boiler. The value is displayed for 5 seconds, after which the
display normally shows the real temperature of water in the boiler.
Setting the desired temperature in the boiler
By pressing the key (6) user can enter the boiler temperature menu.
The desired boiler temperature is blinking.
By pressing the key (6) UP or DOWN, the desired boiler temperature can be set
in steps of 1°C.
If the key is held pressed less than 5 s the value from the display becomes the
desired boiler temperature.
Possible adjustment is from 20°C up to 90°C for radiator heating.
Possible adjustment is from 15°C up to 45°C for under floor heating.
Reset to factory defaults
By pressing the key (6) longer than 15 seconds, all parameters will return to the
factory default values and controller will be reset and show software version.

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5.4.2. Access to special service menu
>10 sec
>15 sec
>20 sec
>15 sec
15
15
2
15
>5 sec
>25 sec
>30 sec
Power
ON
>5 sec
>5 sec
>5 sec
45
3
1
.
>5 sec
>5 sec
>5 sec
>5 sec
>5 sec
Press simultaneously to access service menu
Access to special service menu
To access in special service menu, press simultaneously
key (6) during switching ON main switch on boiler - RCCB
(in that moment key (7) must be turned off)
Limiting maximum boiler temperature
By pressing the key (6) user can limit maximum boiler
temperature.
Factory defined maximum temperature starts to blink. By
pressing up or down user can set new maximum
temperature. If the key is depressed for more than 5s,
value on the display will be memorized and becomes
active.
Radiator heating: Adjustment range 60°C-90°C, factory
default 80°C
Underfloor heating: Adjustment range 30°C-50°C,
factory default 80°C
Setting the minimal boiler temperature
By pressing the key (6) user can set minimal boiler
temperature.
Minimal boiler temperature starts blinking.
By pressing the key user can select the desired minimal
boiler temperature. Temperature changes in steps of 1°C.
If the key is depressed for more than 5s, value on the
display will be memorized and becomes active.
Radiator heating: Adjustment range 20°C-45°C, factory
default 45°C
Underfloor heating: Adjustment range 15°C-30°C,
factory default 30°C
Setting the heating pump delay
By pressing key (6) user can change pump delay time
between 0 - 15 min. Factory settings is 2.
Selecting the time delay between steps for
power regulation
By pressing the key (6) user can change the time delay
between step for power regulation in the range from 5 to 60
seconds. Default value depends on the number of stages
for power regulation –each stage will add 5 seconds. 3
stages will have 3*5=15 seconds between successive
stages turn-on. Turn of delay is fixed to 1 second.
Selecting the number of steps for power
regulation
By pressing the key (6) servicer can change the number of
steps for power regulation.
By pressing the key it is possible to select 1 to 3 steps for
power regulation. Default settings:3 power levels. Change
in the number of stages will cause time delay parameter to
be changed (see above) !
Selecting the number of pumps for controlling
By pressing the key (6) servicer can change the number of
pumps, one or two –only for option control panel “Z“

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5.4.3. Control panel “Z” –OPTION
Figure 13 - Control panel “Z” - OPTION
Figure 14 - Hydraulic sketch for TermoMini with OPTION control panel type “Z”
1. Multipurpose –temperature indicator (temperature of
boiler, sanitary water, adjustment of temperature)
2. Signalization of operation degree of heaters (1., 2., 3.)
3. Signalization of air appearance in the boiler (red light)
4. Signalization of under voltage protection (red light)
5. Signalization of boiler operation (green light)
6. Adjustment of temperature in boiler
7. Switch for central heating switching on and off
8. Sanitary water temperature adjustment
9. Switch for switching on and off the sanitary water
preparation
10. Signalization of sanitary water preparation and
consumption
11. Indicator of pressure in a boiler
12. Thermal fuse

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Figure 15 - Connecting 3-way valve
6. Maintenance
6.1. Periodic checking
We recommend the inspection of the device once a year by the authorized service provider
(before heating season). This service is not included in the warranty. During the inspection
all electric and water connections should be tightened, the system should be vented
and –if necessary –filled up, valves and general functionality of the device should be
checked.
RCCD switch - pressing the TEST button must disconnect the RCCD switch. This testing
procedure insures that switch is functioning properly. We recommend this test once or twice
in heating season.
Safety valve should be checked once a year (before the beginning of heating season) to
ensure proper functioning and avoiding appearance of water calculus.
If the boiler is not connected to the room thermostat or if the boiler is out of function during
the winter time, there is a danger of installation freezing.
In this case the system should be filled with antifreeze liquid for central heating, and if this is
not possible water should be drained out.
6.2. Cleaning
It is not permitted to use aggressive media (e.g. gasoline, kerosene or solvent) for cleaning
the product. Media for cleaning plastics or dishwashing media can be used for the external
shell and decorative cover. Control panel should be cleaned with dry or moist cloth (not wet).