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.

SERVICE MANUAL GH11NB
August 2014 2
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

SERVICE MANUAL GH11NB
August 2014 3
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:

SERVICE MANUAL GH11NB
August 2014 4
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

SERVICE MANUAL GH11NB
August 2014 5
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

SERVICE MANUAL GH11NB
August 2014 6
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:

SERVICE MANUAL GH11NB
August 2014 7
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

SERVICE MANUAL GH11NB
August 2014 8
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.

SERVICE MANUAL GH11NB
August 2014 9
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.

SERVICE MANUAL GH11NB
August 2014 10
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.