Compit B750 T-1 Specification sheet

Operating and Installation
Manual
for the u2.00 software version, version 1, 21 February 2017
CONSTANT CONTROLLER OF THE CH BOILER
(GAS/OIL) AND HUW TANK.
Pb
B750 T-1
B750 T-1
COMPIT, ul. Wiel obors a 77, 42-280 Częstochowa, tel.[phone] www.compit.pl

Table of Contents
Description of the controller.........................................................................3
Operation...............................................................................................4
Information Display.................................................................................4
Switching on and off the controller..............................................................5
Setting temperature of the boiler...............................................................5
Setting HUW temperature.........................................................................5
SUMMER mode.......................................................................................6
Advanced Operation...................................................................................6
Restoring factory settings.........................................................................6
Setting parameters.................................................................................6
Service parameters.................................................................................8
Anti-legionella......................................................................................8
Manual operation...................................................................................9
Description of alarm states.......................................................................9
Description of operation............................................................................10
Burner operation..................................................................................10
Wor ing with room thermostat..................................................................10
HUW tan operation..............................................................................10
Assembling.............................................................................................11
General information..............................................................................11
Dimensions of the housing.......................................................................11
Technical data.....................................................................................12
Arrangement of terminals.......................................................................12
Sensors..............................................................................................13
Power supply.......................................................................................13
Room thermostat connection....................................................................14
NANO thermostat connection...................................................................14
2 User manual B750 T u2x, version 1, February 2017

Description of the controller
The main tas of the controller is to maintain the set temperature of the CH boiler
with single-stage oil or gas burner and to load HUW tan . The controller can operate in
the system with two pumps or circulating pump and distributor. Configuration changes
are made in the "Operating State". The controller operates with room thermostat.
Connection of NANO room thermostat additionally allows monitoring the operation of
the controller.
User manual B750T u2.x, version 1, February 2017 3
Fig 2: Operating State = P.+ DISTRIBUTOR
B750 T-1
B750 T-1
Boiler
sensor
HUW
sensor
Pump
Room
thermostat
Distributor
Fig 1: Operating State = CH and HUW pump
B750 T-1
B750 T-1
H pump
Boiler
sensor
HUW
semsor
HUW
pump
Room
thermostat

Operation
Information Display
After switching on the controller displays for a moment its name and version number,
for example:
Then it proceeds to display the basic screen that contains a range of information on
the operation of the controller.
4 User manual B750 T u2x, version 1, February 2017
COMPIT
B750T u1.00
LCD display
with bac light.
Mode controls:
Off – lights red
OPERATION – lights green
ALARM – lights alternately
red and green.
START/STOP button:
Switching on. Switching off
- when pressed for 3
seconds. Alarm
ac nowledgement.
EXIT button: return to the
home screen.
OK button: viewing
parameters and setting
values.
Down arrow button: moving
on the parameter list or
decreasing the value of the
parameter.
Up arrow button: moving on
the parameter list or
increasing the value of the
parameter.

The top line displays information about the activated relays: BUR- burner, CH – CH
pump. HW – HW pump or CH/HUW valve.
Tch:- measured boiler temperature
Ts:- set boiler temperature
- boiler temperature is lower than the temperature of the pump activation.
- decrease from the room thermostat.
The information display in the off mode is shown below:
Switching on and off the controller
If the controller displays Off, then press the button to activate it.
Stopping a running controller can be done by pressing the button for 3 sec. In
"Off" mode, the controller can perform off-season runs, if they are activated in "Off-
season runs" parameter.
Setting temperature of the boiler
1. The preset temperature of the boiler is set on the main screen.
2. Press button, the display shows „?”
3. Use , buttons to set the desired temperature of the boiler
4. Press button, „?” disappears.
Setting HU temperature
To be able to set the hot water (HUW) it must be switched on in the „HUW
Operation” parameter.
1. Use / buttons to display window of HUW readings
Phw: the state of tan loading pump, 0 = off, 1 = loading the tan (HUW);
Thw: temperature readout in HUW tan ;
User manual B750T u2.x, version 1, February 2017 5
Off
Tch:15° Ts:55°
BUR:1 CH:0 HW:0
Tch:15° Ts:55°
BUR:1 CH:0 HW:0
Tch:17 ? Ts:55°
Phw:1 Thw:22°C
♦Thw set: 50°C

2. Press button, the display shows „?”
3. With the use of the and buttons set the desired HUW temperature
4. 4. Press button, „?” disappears.
SUMMER mode
SUMMER mode is activated in the parameter with the same name. In the SUMMER
mode central heating pump is turned off, the controller will only load HUW tan .
Advanced Operation
Restoring factory settings
To restore the factory settings of the controller perform the following activities:
1. Set in the „ ACCESS CODE” parameter - value 70
2. Confirm it by pressing button.
3. Press simultaneously , buttons.
4. Entering the factory settings is confirmed by the following information on the
display:
Setting parameters
To change the parameter value perform the following activities:
1. 1. Move to ACCESS CODE
2. Press button. The display shows „?”, this indicates code value editing mode.
3. With the use of and buttons set value 99 for editing the basic parameters
and 199 for editing the service parameters.
4. Press button, „?” disappears
5. With the use of and 5. buttons move to the value readout you want to
change.
6. Press button. Symbol "?" is displayed before the parameter value. This is the
parameter value editing mode.
6 User manual B750 T u2x, version 1, February 2017
F CTORY
SETTINGS

7. With the use of and buttons change the parameter value.
8. Exit the edit mode by pressing button. "?" disappears.
, buttons are again used to move on the list of parameters. The code does not
have to be set prior to the change of the next parameter. However, if no controller
button is pressed for 4 minutes, the code is set to 100 and must be reset before the next
edition of the parameter values. Changes of the parameter values are automatically
stored in memory and do not require approval. The settings in the memory are stored
for at least 10 years (controller switched off).
BUR:0 CH:1 HW:0
Tch:56° Ts:55°
PAL: burner, CO: pump CO, CW: HW pump
0- off, 1- on
Tch – CH temperature, Tset – CH set temperature
Thw:49°C
Thw set:50°C
Phw: HW pump
0- off, 1- on
Thw – HW temperature
Thw set – HW set temperature.
SUMMER mode
off
SUMMER mode
off- controller controls CH and HUW pumps
on- CH operation is bloc ed
ACCESS CO E
100
Access to the other parameters requires setting 99.
Language
POLISH
Language selection
•POLISH
•ENGLISH
HUW Operation
with priority
HUW operation:
•with priority- CH pump is switched off while loading HUW tan .
•parallel with CH – loading HUW tan does not switch off CH
pump
•off - controller does not control loading of HUW tan
Pump activation
Temp. 42°C
Boiler temperature (Tch) above the one at which the controller
may activate the pump.
Setting range: 32..55°C
Thermostat
off
Thermostat:
•off
•on
•NANO 1 – indicates NANO with address 1
•NANO 2 – indicates NANO with address 2
•NANO 3 – indicates NANO with address 3
•NANO 4 – indicates NANO with address 4
•NANO 5 – indicates NANO with address 5
User manual B750T u2.x, version 1, February 2017 7

Anti-legionella
NO
Anti-legionella function provides wee ly heat sterilization of the
HUW tan . It requires connection of the NANO module.
Boiler hyster.
2°C
Boiler hysteresis. The burner turns on when the boiler set
temperature will decrease below the value set here. It switches
off after reaching the set temperature. Setting range 1..5°C .
HUW loading
hyster. 3°C
HUW loading hysteresis. Loading the HUW tan starts when the
water set temperature falls by the value set here. It ends after
reaching the set temperature. Setting range1..10°C
CH excess to
load HUW 5°C
While loading HUW tan the temperature maintained in the boiler
is higher than the set HUW temperature by the value set in this
parameter. Setting range 0..20°C
Pump run
time 60s
Pumps run provide heat collection accumulated in the boiler body
limiting at the same time increase in temperature of the boiler in
case of reducing the load. Setting range 0..600s.
HUW off with
NANO 1 NO
This parameter determines whether HUW operation is to be
turned off when the user sets for NANO with address 1 HOLIDAY
mode.
Operating state
CH and HUW pumps
Operating state
•CH and HUW PUMPS – system operation with two pumps (Fig. 1)
•P.+ DISTRIBUTOR - system operation with one pump and
distributor CH/HUW (Fig. 2)
Oper. mode RS485
MASTER
RS485 serial interface operating mode. The controller uses the
protocol C14. One controller in such a networ must be in MASTER
mode. Others must operate in SLAVE mode.
A RESS in NET
1
Controller address in the net. Two controllers of the same class
cannot have the same address.
Off-season
runs on
Off-season runs protect pumps against bloc ing due to deposition
in them sediments and contaminants. They consist of switching
CH and HUW pumps every 3 days for 15 seconds.
Service parameters
Service parameters are available with code 199.
Max. boiler
set temp. 85°C
Maximal boiler set temperature.
Setting range 80..95°C .
Min. boiler
set temp. 40°C
Minimalna temperatura zadana otła.
Setting range 30..80°C .
Anti-legionella
Anti-legionella function must be activated in „Antilegionella” parameter. Sterilization
is carried out by trying to increase the temperature of the HUW tan to 72°C. The
controller does this every wee .
8 User manual B750 T u2x, version 1, February 2017

Manual operation
Manual mode lets you easily test the operation of the controller outputs and proper
connection. To enter the manual operation, turn off the controller using the power
switch. Press and buttons and then switch on the power. After a while on the
display appears:
CH:23° – measured boiler temperature, /P:1 CH pump operation
BUR:0 burner operation, CW:15° - measured HUW tan temperature, /P:0 – HUW
pump operation
Meaning of buttons:
- On / off CH pump
- On / off HUW pump
- On / off burner
- Finish manual operation.
Description of alarm states
The controller displays information about recognized alarm state, which prevents
normal operation of the boiler. This is signaled by the changing color of the indicator and
activation of the buzzer. Boiler operation is stopped.
E01 Tch>Talarm
Tch:99° Ts:55°
The boiler temperature exceeded 95°C. Alarm is activated after
60 seconds.
E08 amaged SEN.
Tch:##° Ts:55°
Boiler temperature sensor damage. The alarm is signaled if the
measured temperature exceeds the measuring range of the
controller (-9 .. +109 °C).
If the alarm cause was resolved, the alarm state can be reset by pressing
User manual B750T u2.x, version 1, February 2017 9
TEST CH:23°/P:1
BUR:0 HW:15°?P:0

Description of operation
Burner operation
Boiler burner is activated when the boiler temperature drops one degree below the
set point minus the boiler hysteresis. The burner is switched off when the boiler set
temperature is reached. For example, if the set temperature = 55°C, and hysteresis =
3°C, the burner turns on at boiler temperature 51°C and turns off at temperature
55°C .
orking with room thermostat
Cooperation with room thermostat helps to maintain the proper temperature in the
heated rooms. This also affects the fuel savings. Room thermostat operation is turned on
in the „Thermostat” parameter.
When the room temperature reaches the value set on the thermostat, information
about this fact reaches the controller and is indicated by the arrow symbol that appears
on the main screen. The controller turns off the burner, CH pump is turned off with a
delay that is specified in the „Pumps run time”.
HU tank operation
HUW tan operation can be activated in "HUW operation" parameter. You can choose
to wor in parallel with CH or HUW priority – then while loading HUW tan CH pump is
turned off.
The tan is loaded, if its temperature drops one degree below the set value minus
the value of the parameter "HUW loading hysteresis". If necessary, the controller
increases the boiler set temperature by the value set in parameter "CH excess to load
HUW" above the HUW set temperature. HUW pump is switched on when the boiler
temperature is sufficiently higher than the tan temperature; such action prevents
cooling of the tan by the boiler. Loading ends after reaching the tan set temperature.
The loading pump continues to run for time set in parameter "Pump run time" to safely
distribute heat accumulated in the boiler while loading the HUW tan . The run time can
be automatically shortened if the temperature of the boiler permits it.
10 User manual B750 T u2x, version 1, February 2017