Geco GH11NB User manual

INSTRUCTION OF
CONTROLLER
OPERATION
GH11NB
FOR CONTROLLING CENTRAL
HEATING BOILERS WITH
AIR BLOW
Program version
01
USER MANUAL
We request that users carefully study applicable Instructions before connecting and
starting up any of our products. Should any doubts arise, please contact our Company between
8 a.m. and 4 p.m.

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TABELE OF CONTENTS
1. INTRODUCTION ...............................................................................................................................3
1.1. GRAPHIC SYMBOLS................................................................................................................................3
1.2. KEYBOARD AND FUNCTION KEYS .............................................................................................................4
2. GENERAL FEATURES.........................................................................................................................4
3. TECHNICAL DATA.............................................................................................................................5
4. ELECTRICAL SYSTEM AND CONNECTION RULES.................................................................................6
5. QUICK START...................................................................................................................................6
6. THE GH11NB OPERATION................................................................................................................7
6.1. OPERATED HEATING SYSTEM ..................................................................................................................7
6.2. AUTOMATIC OPERATION MODE...............................................................................................................8
6.3. MANUAL OPERATION MODE ................................................................................................................10
6.4. VIEWING TEMPERATURES.....................................................................................................................10
6.5. ALARM CONDITIONS ...........................................................................................................................11
6.6. POWER OUTAGE.................................................................................................................................11
6.7. BOILER BURNOUT DETECTION...............................................................................................................11
7. USER SETTINGS..............................................................................................................................12
7.1. BOLIER TEMPERATURE SETTING (U0).....................................................................................................12
7.2. FAN SPEED (U1) .................................................................................................................................13
7.3. HUW/ RETURN TEMPERATURE SETTING (U2)........................................................................................13
7.4. ANTI-LEGIONELLA FUNCTION (U3) ........................................................................................................13
8. OPERATING THE HUW BOILER........................................................................................................14
8.1. INSTALATION AND CONNECTIONS ..........................................................................................................14
8.2. CONFIGURATION OF ADDITIONAL PUMP..................................................................................................15
8.3. HUW PRIORITY..................................................................................................................................15
8.4. SUMMER MODE .................................................................................................................................15
8.5. STANDARD THERMOSTAT .....................................................................................................................16
9. ROOM PANEL GA01HA - GECO ......................................................................................................16
10. TEMPERATURE LIMITER (STB).....................................................................................................18
10.1. OPERATION PRINCIPLE .....................................................................................................................18
10.2. STB FUNCTION RESTART (MANUAL)....................................................................................................18
11. PROCEDURE IN THE CASE OF CONTROLLER DAMAGE ..................................................................19
12. CONNECTION DEVICES TO THE GH11NB CONTROLLER.................................................................22
13. INFORMATION ON LABELLING AND COLLECTION OF WORN OUT ELECTRICAL AND ELECTRONIC
EQUIPMENT .........................................................................................................................................23
14. NOTES........................................................................................................................................23

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1. INTRODUCTION
1.1. Graphic symbols
Warning
This symbol is used when it is necessary in described instructions to follow the
sequence of carried out operations. The unit may be damaged or destroyed in case of
any error or proceeding in discord with the description.
Important!
This symbol indicates information of particular importance.

Reference
This symbol indicates occurrence of additional information in a chapter
Symbols intended to indicate and at the same time emphasise the importance of text containing
information that warns against dangerous situation have the following graphic forms:

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1.2. Keyboard and Function Keys
2. GENERAL FEATURES
The GH11NB Controller is a microprocessor-based device manufactured using the Surface Mount
Technology (SMT).
It is designed to control the processes of Hot Utility Water (HUW) heating and the main Central
Heating (CH) water circuit. Control parameters can be adjusted to the current operating conditions and
boiler type. The Controller includes a system protecting from power outages and other different
disturbances.
The GH11NB Controller is fitted with:
inputs:
1. Boiler output water temperature measurement (NTC sensor),
2. HUW boiler water /return water temperature measurement (NTC sensor),
3. Flue gas temperature sensor in chimney (PT1000 sensor),
4. Standard thermostat
digital input:
5. Input for connection of the room thermostat panel GA01HA-GECO.
PROGRAMMING
ON/OFF
CH AND HUW PUMPS
MANUAL SWITCHING /
PUMPS OPERATION
INDICATORS
AUTO-OPERATION
INDICATOR
CH PUMP MANUAL
SWITCHING /
UPWARD VALUE
CHANGE
AUTO
MAINTAIN OPERATION
INDICATOR
HUW PUMP MANUAL
SWITCHING /
DOWNWARD VALUE
CHANGE

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It also contains four outputs allowing direct connection of 230 V AC devices: fan, CH circulation pump,
HUW pump or mixing pump, depending on the type of the controlled heating system (section 6.1.1 p.6).
ALWAYS DISCONNECT THE CONTROLLER
FROM POWER DURING THUNDERSTORMS
3. TECHNICAL DATA
Power supply
230V ~ +10% -15%
NTC sensor
resistance
characteristics
PT1000 sensor
resistance
characteristics
Operating temperature
range
+5°C to +40°C
Humidity
20% to 80% RH
Temp.
°C
Resistance
Ω
Temp.
°C
Resistance
Ω
Fan protection
3,15A
0
7174,89
0
1000,00
Sensors type
NTC 2,2kPT
10
4374,83
50
1194,00
Sensors operating
temperature range
NTC:
0°C÷100°C
20
2747,10
100
1385,10
PT1000:
0°C÷750°C
30
1774,91
150
1573,30
40
1172,09
200
1758,60
50
795,08
250
1941,00
Output
Maximum
continuous load
60
547,95
300
2120,50
70
384,62
350
2297,20
HUW pump / mix pump
1A
200W
80
275,86
400
2470,90
CH pump
1A
200W
90
202,37
450
2641,80
Fan
*
1A
200W
100
149,16
500
2809,80
550
2974,90
600
3137,10
650
3296,40
700
3452,80
750
3606,40

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4. ELECTRICAL SYSTEM AND CONNECTION RULES
1. The boiler room should be equipped with a 230V/50Hz electrical system, according to the
applicable regulations.
2. The electrical system (regardless of its type) should be terminated with a connection outlet fitted
with a protective terminal. Use of an outlet without a protective terminal causes electrical shock
hazard!!!
3. Connect the Controller to a separately installed power line protected with a properly selected
quick circuit-breaker or a residual-current device (RCD breaker). Do not connect any other devices
to this line!!!
THE CONTROLLER IS POWERED FROM 230V/50HZ MAINS
ANY REPAIRS MAY BE CARRIED OUT ONLY WITH POWER SUPPLY
CUT OFF AT THE FUSE
5. QUICK START
To quickly start the GH11NB Controller, perform the following actions:
1. Connect the device to the 230V AC power system (put the plug in the power outlet).

2. Turn the Controller ON by pressing . Screen appears:

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3. Press . Screen appears:
and the Controller starts automatic operation according to the factory settings.
Tabele 1 Factory settings chart
User
parameter
Description
Factory
setting
u0
Boiler preset temperature
600C
u1
Fan speed
5
u2
HUW/return set temperature
400C
u3
Anty-Legionella , 1-Yes, 0-No
0
6. THE GH11NB OPERATION
6.1. Operated Heating System
6.1.1. Central Heating cycle + HUW cycle
INPUTS
OUTPUTS
T1 –Boiler temp.
P1 –HUW pump
T2 –HUW temp.
P2 –CH pump
T3 –Flue gas
temp.
P3 –Fan

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6.1.2. Central Heating cycle + mixing pump
INPUTS
OUTPUTS
T1 –Boiler temp.
P1 –Mixing pump
T2 –Return temp.
P2 –CH pump
T3 –Flue gas
temp.
P3 –Fan
6.2. Automatic operation mode.
By pressing , you can turn on the automatic operation mode –the Controller lights the upper
indicator on ( ).
6.2.1. Fan
In the AUTO mode, the fan runs continuously until the boiler temperature reaches the value set by the
user in the u0 setting.
The fan starts with minimal speed (gear 1) and increase its speed according to F31 parameter until getting
to speed set in U1 parameter (Table 1).
When flue gas temperature sensor is connected to the controller and it is activated (F11 > 0), after
exceeding flue gas temperature set in F42 parameter the fan speed is reduced. This reduction is
proportionate until the fan stops completely.
Activation and operation of the fan is indicated by means of a vertical line on the left side of the display, in
the lower sign segment, on the Controller main display screen.

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6.2.2. CH Pump
In the AUTO mode, the CH pump starts when the temperature of the boiler water is higher or equal to the
value set in the F06 service setting (factory setting is 40°C).
Turning the CH pump on and its operation is indicated by lighting the upper indicator on .
The Controller turns off the pump when the water temperature drops to the activation temperature minus
4°C. (If the CH pump start temperature is 40°C, then the CH pump stop temperature is 36°C).
6.2.3. Maintain Operation Mode
The Controller gets into that mode when the boiler temperature reaches the value set by the user in the
U0 setting.
This mode of operation is indicated by lighting the lower indicator on ( ).
When set temperature is reached and F32=0, the fan will be turned on only for periodical blows. The
duration of blow is consistent with the value set in parameter F26, and the fan works with maximum
speed. The air blows take place at the time set in parameter F27.
When F32 > 0 and the outlet water temperature does not exceed the value equal to the U00 + F33, the fan
works with speed set in F32 parameter. The Controller will exit the MAINTAIN mode and return to the
AUTO mode if the boiler temperature drops to the value equal to the U00 –F05.
The CH pump operates identically as in the AUTO mode.

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6.3. Manual operation mode
Pressing causes the Controller to switch from automatic to manual mode, and immediately
deactivates the fan, and the pump.
In this mode, you can manually and independently activate and deactivate the HUW pump and the
CH pump.
To do this, follow the scheme below:
HUW PUMP CAN BE TURNED ON ONLY IF IT IS SELECTED IN
SERVICE PARAMETERS (  SECTION 8.2, PAGE 15)
6.4. Viewing Temperatures
After pressing , the display shows water temperature at the boiler outlet. Viewing
temperatures: flue gas and HUW/return is available in the AUTO and MAINTAIN modes, but only if the flue
gas sensor or HUW/return sensor are properly enabled.
Press to view the flue gas temperature. Press the key again to cancel the view. The view is also
cancelled after 10s from pressing of the key.
Press to get a HUW/return temperature view. Press the key again to cancel the view. The view is also
cancelled after 10s from pressing of the key.
STEP 1
STEP 2
→
and
and
Controller
indicates water
temperature
measured on the
boiler.
HUW pump
Lower key indicator lights
up. Press the key again to
deactivate the pump and the
indicator.
CH pump
Upper key indicator lights
up. Press the key again to
deactivate the pump and the
indicator.

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6.5. Alarm Conditions
The Controller uses 6 different alarm conditions. In each alarm condition, the Controller displays the
alarm number and activates the alarm sound output. In case of several alarm conditions occurring
simultaneously, their numbers are displayed in sequence. You can exit an alarm condition only by pressing
. This does not include the AL12 and AL7 alarm condition.
Alarm conditions:

AL1

STB activated or fuse blown

AL2

Boiler water outlet temperature sensor failure

AL4

HUW/return temperature sensor failure

AL7

Flue gas temperature sensor failure **

AL12

Boiler overheating

AL13

Boiler burnout
**This alarm apear just during viewing flue gas temperature and there is no acustic signal.
6.6. Power Outage
After a power outage the Controller starts to reactivate according to the condition it was in before the
power down. The Controller waits 1 minute to stabilise the mains power parameters, and then restores
operation with the previously programmed settings.
During the waiting period, the display shows time in seconds remaining until the end of the period,
along with indication of its condition before the power outage:
blinking “A” for AUTO mode,
blinking “P” for SUSTAIN mode,
blinking “r” for MANUAL mode.
Respective indicators (AUTO or SUSTAIN ) are blinking along with the letters.
6.7. Boiler Burnout Detection
6.7.1. No Fuel
If during automatic operation the boiler outlet water temperature remains below the F08 setting
for a period of time set in the F09 setting, then the Controller considers the boiler as “burned out” and
enters the AL13 alarm condition.

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6.7.2. Sudden Drop of Outlet Water Temperature
If during automatic operation the boiler outlet water temperature drops by 10°C, and during that
dropping period the temperature does not rise by 4°C, then the SH and DHW pumps are switched off, and
the Controller goes into the burnout detection mode.
The Controller waits for the period of time set in the F10 setting, during which it checks whether a rise of
4°C occurs.
If YES, then the burnout detection condition is stopped, and the SH and DHW pumps (if necessary) are
started. If NOT, this means that the furnace is burned out –the Controller enters the AL13 alarm condition.
STOPPING CH PUMP OPERATION IN BURNOUT DETECTION
IS INDICATED BY BLINKING THE UPPER INDICATOR ON .
7. USER SETTINGS
7.1. Bolier Temperature Setting (u0)
You can change the boiler temperature setting using the following procedure:
STEP 1
STEP 2
STEP 3
→
lub
→
Green LED lights on the
key.
Display shows current
temperature setting.
Set a new desired
temperature within range
permitted by the boiler
manufacturer.
Save the new
temperature setting.
Move to the U1
setting
If during setting the new temperature
none of the following keys , ,
is pressed for 15 s, the new temperature will not be saved
and the Controller will exit the programming mode.

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7.2. Fan speed (u1)
This setting determines the fan rotation speed, and thus the amount of air delivered. It allows to adjust
the fan speed according to the type and quality of the fuel used. This setting can be set within the range
of 110, where “1” denotes minimum speed, and “10” maximum speed.
You can change the setting using the following procedure:
STEP 1
STEP 2
STEP 3
STEP 4
→
→
or
→
Green LED lights on
the key.
Display shows the
U0 setting value.
Move to the
U1 setting.
Set the desired value.
Save the new
setting.
Move to the U2
setting.
7.3. HUW/ Return Temperature Setting (u2)
This setting is available to the user only if the HUW heating option or return temperature stabilisation are
used, and the user configured the pump with the F00 service parameter by setting it to the values “01”,
“02”, “03”, “04” (section 7.2 page 13). You can modify this setting in a similar way to the described in
sections 7.1.
7.4. Anti-Legionella Function (u3)
The GH11NB controller is equipment in Anti-Legionella function which limit growth Legionella
pneumophilia bacterium on HUW installation. This function is available for users when value F00 service
parameter was adjust on „02”, „03” or „04”.
The Legionella bacterium growth in water environment and the best condition is on 38–420C
temperature. The Legionella bacterium can cause variety pneumonia disease, called Legion fever.
To activate the ANTI-LEGIONELLA function, set the U3 setting to 1.
When the function is active, a blinking letter “L” is visible on the left part of the display, before the
displayed temperature value.
You can turn off the function by modifying the U3 setting to 0, or by pressing . The anti-legionella
function is also cancelled after a power down. The ANTI-LEGIONELLA function has higher priority over
other functions, therefore it is performed by the Controller in the first order (superior function).
When the function is activated, the temperature of water in the boiler is increased to 70°C and maintained
for a period of 10 minutes.

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8. OPERATING THE HUW BOILER
The GH11NB Controller allows connection of an additional pump to control the Hot Utility Water
(HUW) in the boiler.
8.1. Instalation and Connections
To use the Hot Utility Water (HUW) heating option, perform the following actions:
1. connect the boiler according to the enclosed diagram (section 6.1.1 page 7).
2. install the HUW temperature sensor in the HUW storage
We recommend mounting HUW temperature sensor in GECO
measuring drain. You can not mount temperature sensors in
measuring drain with water or oil !!!
3. connect the HUW temperature sensor to the Controller at the appropriate
terminals as shown in Fig. 2
4. configure the HUW pump for operation (section 7.2 page 13).
TURNING ON OF THE ANTY-LEGIONELLA FUNCTION CAUSES RISE OF
THE TEMPERATURE OF HUW WATER UP TO 700C.
EXTRA CAUSION WHEN USING HUW.
MAY RESULT IN BURNING !!!
HUW temperature sensor is additional equipment and it’s not includes
to the standard set controller GH11NB.
Additional equipment can be delivery according with additional order.

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8.2. Configuration of additional pump
This procedure allows you to connect an additional pump that can be used as a mixing pump or a Hot
Utility Water (HUW) pump operating with or without higher priority.
The HUW pump is started when the boiler outlet water temperature is higher than 40°C and higher
than the water in the HUW boiler (to prevent cooling of the HUW boiler), and the HUW boiler temperature
is lower than the temperature set in the U2 setting section 5.
Pump operation is indicated by a dot on the display next to the fan symbol. If the boiler room is configured
as shown in the diagram (section 6.1.1 page 7) then the boiler controller has no external alarm output,
but allows to view the HUW boiler temperature by pressing .
Aby załączyć w sterowniku obsługę dodatkowej pompy należy postepować następująco:
STEP 1
STEP 2
STEP 3
STEP 4
→
→
or
→
Display shows
„─ ─ ─ ─”
Press and
hold for 2s
Set the desired F00 value
00 –no pump operation
01 –mixing pump
02 –HUW pump winter mode
without priority
03 –HUW pump winter mode with
priority
04 –HUW pump summer mode
Save the
new setting
8.3. HUW Priority
The GH11NB Controller allows to set operation of the HUW pump with priority. If you choose this
mode of HUW pump operation, the hot utility water heating is a higher priority function in the Controller.
To do this, set the F00 service setting to the value of “3”.
8.4. Summer Mode
The GH11NB Controller is equipped with a SUMMER MODE option that allows you to turn off the CH
pump for the summer season, and the boiler operates only to supply the HUW water. To do this, set the
F00 service setting to the value of “4”.

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8.5. Standard thermostat
The GH11NB controller can cooperate with external room thermostat (Fig.1), which can put coal boiler
in blockade position when temperature is reach in room.
During blockade position C.H. pump stay off after 4 minutes, for the moment when temperature
in room is Reach (short circuit contact). The boiler start working in maintain operation mode.
The controller GH11NB passing from automatic operation to maintain operation mode just from time to
time, when the boiler temperature is higher than minimum temperature adjust in F03 service parameter or
when HUW circulation require automatic operation controller ( it depend of HUW Priority).
When room thermostat put controller in blockade position, the boiler is in maintain operation mode and
boiler temperature fall down less than F03 service parameter or HUW circulation need heating, than the
controller come back to automatic operation mode until both conditions will be accomplish.
The controller supports the room panel of our manufacture. The controller responses to the panel orders if
the controller is under the automatic operation mode. Where the malfunction occurs to the connection
with the panel, the controller will resume the operation with the user programmed settings.
The illuminated dot on the segment on the left-hand side of the display shows that the communication link
is operable.
9. ROOM PANEL GA01HA - GECO
The GH11NB controller has been fitted for full communication with the GA01HA room panel manufactured
by GECO, which allows to control boiler operation comfortably from user’s apartment.
The GA01HA room panel connected to the GH11NB controller allows:
to change boiler preset temperature
to change HUW preset temperature
information on all alarms to be displayed in room panel
to view boiler operation state
to view operation states of other units (fan, fuel, central heating pump, HUW pump)
to view all measured temperature values

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If the GA01HA room panel is correctly connected to the GH11NB controller, it will be automatically
detected by the controller. Then, user is not required to carry out any additional operations or make any
settings.
In this case, the controller will work according to the room panel settings.
Proceed as follows to connect the GA01HA room panel to the GH11NB controller:
Step 1
Step 2
Step 3
Step 4
Step 5
Switch off the
controller
using push-
button
and remove
mains cable
plug from
socket
→
Open the
controller
(remove
upper cover
of the
housing)
→
Connect
room panel
to the
controller
using
terminals
A-B-C-D
→
Snap shut
upper cover
of the
controller
housing
(close the
controller)
→
Plug in mains cable
in the 230V socket
and switch on the
controller using
push-button

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10. TEMPERATURE LIMITER (STB)
The GH11NB controller is provided with an extra mechanical protection, independent of automatic
systems. It is called safety temperature limiter (STB).
10.1.Operation principle
In case heating water reaches the temperature of 950C, temperature limiter will start working
automatically (it will activate the STB function), and interrupt fuel supply and air delivery to combustion
chamber (it will switch off the fan).
When temperature in the limiter drops by approximately 200C, it will be possible to restart the STB
function, but only manually.
10.2. STB function restart (manual)
In order to restart the device press push-button “RESET” installed on the left side of the controller housing.
The controller does not return by itself to automatic operation due to safety reasons.
Press push-button twice to resume the controller operation:
- first pressing of push-button will cancel the alarm and switch off the controller
- second pressing of push-button will restart the controller
- press push-button - the controller will switch to automatic operation mode
Temperature limiter (STB)
RESET push-button

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CAPILLARY TUBE PUNCTURE OR BREAKAGE INDICATES THAT
TEMPERATURE LIMITER FILLED WITH LIQUID LEAKS, WHICH RESULTS IN
ABNORMAL OPERATION OF THE GH11NB CONTROLLER.
IN CASE IF THE ABOVE-MENTIONED DEFECT IS FOUND, IT WILL BE
NECESSARY TO DISCONNECT TEMPERATURE LIMITER FROM THE
GH11RNB CONTROLLER, REMOVE IT AND REPLACE WITH A NEW
DEVICE.
11. PROCEDURE IN THE CASE OF CONTROLLER DAMAGE
In a case if have been noticed any irregularities in functioning of controller, user should contact with the
supplier / producer or GECO company. Professional technical assistance will be given to him. If service
assistance is indispensable (repair of the controller), damaged controller should be dismounted from the
boiler and sent as a set (together with casing) on indicated address.
SENDING A NOT COMPLETE CONTROLLER TO THE SERVICE CAUSES
UNABLE SERVICE REALISATION

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PREPARING THE CONTROLLER TO DELIVERY TO THE SERVICE
STEP 1
Disconnect a controller
from power supply
(remove plug from power point)
STEP 2
Remove a front panel
by using of flat screwdriver
STEP 3
Remove a top part of casing
(lever snap fasteners)
by using of flat screwdriver