Tech Controllers EU-88 zPID User manual

EU-88 zPID

2

3
EU DECLARATION OF CONFORMITY
Hereby, we declare under our sole responsibility that EU-88 zPID manufactured by
TECH STEROWNIKI, head-quartered in Wieprz Biała Droga 31, 34-122 Wieprz, is compliant
with Directive 2014/35/EU of the European Parliament and of the Council of 26 February
2014 on the harmonisation of the laws of Member States relating to the making available on
the market of electrical equipment designed for use within certain voltage limits (EU OJ L
96, of 29.03.2014, p. 357), Directive 2014/30/EU of the European Parliament and of the
Council of 26 February 2014 on the harmonisation of the laws of Member States relating to
electromagnetic compatibility (EU OJ L 96 of 29.03.2014, p.79), Directive 2009/125/EC
establishing a framework for the setting of ecodesign requirements for energy-related
products as well as the regulation by the MINISTRY OF ENTREPRENEURSHIP AND
TECHNOLOGY of 24 June 2019 amending the regulation concerning the essential
requirements as regards the restriction of the use of certain hazardous substances in electrical
and electronic equipment, implementing provisions of Directive (EU) 2017/2102 of the
European Parliament and of the Council of 15 November 2017 amending Directive
2011/65/EU on the restriction of the use of certain hazardous substances in electrical and
electronic equipment (OJ L 305, 21.11.2017, p. 8).
For compliance assessment, harmonized standards were used:
PN-EN IEC 60730-2-9:2019-06, PN-EN 60730-1:2016-10.
Wieprz, 08.07.2022

4
ATTENTION!
HIGH VOLTAGE!
Make sure the regulator is disconnected from the
mains before working on the power supply (cable
connections, device installation, etc.)!
All connection works must only be carried out by
qualified electricians.
Before activating the controller, measure the motor
resetting efficiency, check the boiler and inspect
wire insulation.
We are committed to protecting the environment. Manufacturing electronic devices
imposes an obligation of providing for environmentally safe disposal of used electronic
components and devices. Hence, we have been entered into a register kept by the
Inspection For Environmental Protection. The crossed-out bin symbol on a product
means that the product may not be disposed of to household waste containers.
Recycling of wastes helps to protect the environment. The user is obliged to transfer
their used equipment to a collection point where all electric and electronic components
will be recycled.

5
I. Description
The ST–88zPID temperature regulator is intended for use with central heating boilers.
The regulator is used for controlling the central heating water circulation pump, hot
consumption water pump and blow (fan).
The EU-88zPID is a PID-basedcontroller using a continuous signal. In this type
of controllers, the fan power is calculated based on boiler temperature and flue gas
temperature measured at the boiler outlet. The fan runs continuously and its power
depends directly on the measured boiler temperature and flue gas temperature as well
as the difference between the two parameters and their setpoint values. Advantages of
zPID regulators include their ability to maintain a stable setpoint temperature without
unnecessary overregulations and oscillations.
By fitting the controller with a flue gas outlet sensor, you can save from a few
up to several percent of fuel, and ensure a steady water temperature for a longer service
life of your heat exchanger (boiler). Flue gas outlet temperature monitoring ensures
reduced harmful dust and gas emissions. The thermal energy from the flue gases is
used for heating instead of being wasted and disposed of through the funnel.
Research results presented below were obtained using the Tech PID-based
controller:
Blow
C.H. Pump
H.C.W. Pump
Manual Mode
Encoder knob
Blow

6
and the controller without PID control:
You can change all parameters with an encoder knob. Turning the knob allows you
to select a function or modify its value, while pressing the knob allows you to enter the
function or confirm changed values. To leave any function, turn the knob until you reach
the <<EXIT position and confirm your selection by pressing the knob.
I.a) Basic Terms
Fire up. The cycle begins when you activate the fire up function in the controller's menu
and is active until the central heating boiler temperature reaches 40oC (the default fire-
up threshold), on condition that the temperature does not drop below this value for 2
minutes (the default fire-up time). If these conditions are met, the regulator will switch

7
to the duty mode and the manual operation symbol on the housing will be deactivated.
If the controller fails to reach parameters required for entering into the duty mode
within 30 minutes from activation of the fire-up function, the "Unable to fire up"
message will appear on the display. In such a case, the fire-up cycle needs to be
restarted.
Duty –once the fire-up cycle is finished, the controller enters the duty cycle. The duty
cycle is the basic functionality of the regulator. The blow is controlled automatically
using the zPID algorithm and the temperature is close to its setpoint value. In the user
menu, fan item will appear in place of the fire-up function. The fan can be deactivated
when needed (e.g. while feeding fuel). If the temperature rises unexpectedly by more
than 5oC over the setpoint value, the so-called Supervision Mode is activated.
Supervision Mode –the mode is activated during the Duty Cycle if the temperature
rises by more than 5oC over the setpoint value. In such case, the controller is switched
from the PID control to manual settings (according to parameters entered in the Fitter’s
Menu) to reduce the temperature of the circulation water.
Damping –if boiler temperature drops by 2oC below the fire-up threshold and fails to
rise above this value for 30 minutes (default damping time), the regulator will switch
to thedamping mode. While in this mode, the fan is deactivated and the display shows
"Damping".
In case of voltage loss, the regulator ceases to operate. When power is restored, the
controller returns to operation with previously set parameters using its built-in memory.
Lack of voltage does not cause the stored parameters to be lost.
II. Regulator Functionality
This chapter describes regulator functionality, how to change settings and navigate in
the menu with the encoder (knob). Depending on the mode the boiler is currently in,
the display will show boiler operational parameters. The given mode is selected by the
user.
.1. Main Page
During normal operation, the LCD display shows the Main Page containing the following:
●Boiler temperature (to the left of the display).
●Setpoint temperature (to the right of the display).
●Fan stop. After manually stopping the fan while in the duty mode, the star symbol
(*) will appear in the top right corner.
●Operation Mode. In the bottom right corner, the corresponding letter of the
operation mode is displayed. Depending on the operation mode, the corresponding
42 Oc | 55 Oc
C.H. Setpoint D

8
symbol is displayed:
D –house heating, B –water heater priority,
R –parallel pumps, L –summer mode.
Pressing the encoder will move you to the main menu. The display shows two
options of the menu. To select a different option, turn the encoder knob.
.2. Changing the central heating and hot consumption
water setpoint temperature.
In order to change the setpoint temperature of the central heating (while in "C.H.
screen" main view), turn the encoder knob and (after setting a desired value) press it
to confirm the change.
In order to change the setpoint temperature of the hot consumption water (while
in "H.C.W. screen" main view), turn the encoder knob and (after setting a desired value)
press it to confirm the change.
Chapter "Screen" describes methods of changing the main screen view.
.3. Firing up
This function allows you to easily fire up the boiler. After igniting the boiler, you
need to activate an automatic fire-up cycle. By selecting optimum parameters, the
boiler uses the zPID function to smoothly switch to the duty mode. If the boiler reaches
the fire-up threshold temperature, the fan item will appear instead of the fire-up
function. From now on, the option will be used to activate/deactivate the fan. This
setting allows you to temporarily deactivate the fan at any time, e.g. while feeding fuel.
If during the fire-up cycle the boiler does not reach 40OCwithin 30 minutes, (default
parameters), the following warning message will appear on the display:
To restore the boiler to operation, switch off the alarm by pressing the
encoder and restarting the fire-up procedure.
.4. Manual Mode
For your convenience, the regulator features a manual mode module. In this mode,
each individual actuator is enabled and disabled independently of the other. In addition
to the Manual Mode function, the Blow Force function has been provided.
Blow Force
Fan
20%
Blow Force
38 Oc | 55 Oc
unable to fire up
42 Oc | 55 Oc
C.H. Setpoint D

9
This function allows you to set the blow force of the fan while in the Manual Mode.
Pressing the ENCODER activates the fan. The fan will operate until the ENCODER is
pressed again.
Press the ENCODER to enable / disable the central heating pump.
Press the ENCODER to enable / disable the (water heater) hot
consumption water pump.
Press the ENCODER to enable / disable the alarm.
.5. Fuel Type
This option allows you to select one of three fuel types (coal, fines and wood) for use
in the boiler. Each fuel type has a fan operation mode assigned to ensure the right
burning process.
.6. Central Heating Pump Activation
With this function, you can set the temperature that will activate the central heating
pump (the temperature is measured on the boiler). The pump will start if the setpoint
temperature is exceeded. The pump will be deactivated when the boiler temperature
C.H. Pump
H.C.W. Pump
Fan
C.H. Pump
H.C.W. Pump
Alarm
Fuel Type
C.H. Pump Activation
35oc
C.H. Pump
Activation
Blow Force
Fan
Manual Mode
Fuel Type
Coal
Fines
42 Oc | 55 Oc
C.H. Setpoint D
42 Oc | 55 Oc
C.H. Setpoint D

10
drops below the activation temperature (minus hysteresis, e.g. 2OC). In this case, the
pump will stop at boiler temperature of 33OC.
.7. H.C.W. Pump Activation
With this function, you can set the temperature that will activate the hot consumption
water pump (the temperature is measured on the boiler). Above the setpoint
temperature (e.g. 40OC), the pump is activated and operates depending on the selected
operation mode. The pump will be deactivated when the boiler temperature drops below
the activation temperature (minus hysteresis, e.g. 3OC). In this case, the pump will
stop at boiler temperature of 37OC.
.8. Operation Mode
With this function, you can select one out of four operation modes.
.8.a) House Heating
If you select this option, the regulator will switch to the house heating mode. The central
heating pump starts to run above the pump activation temperature (set to 35OC by
default). Below this temperature (minus central heating hysteresis), the pump is shut
off. While in the house heating mode, the letter D is displayed in the bottom right corner
of the main screen.
.8.b) H.C.W. Priority
Activating the hot consumption water priority will cause the regulator to switch into the
water heater priority mode. In this mode, the (hot consumption water) heater pump is
activated until the set H.C.W. temperature is reached. Then, the H.C.W. pump is shut
off and the C.H. pump is activated. The central heating pump will run until the water
heater temperature drops below the setpoint value (and the H.C.W. hysteresis); then,
the C.H. pump is shut off and the H.C.W. pump is activated.
In this mode, the fan is operated as long as the temperature is below 62°C to prevent
the boiler from overheating.
The hot consumption water priority function consists in that the consumption water is
C.H. Pump Activation
H.C.W. Pump Activation
40oc
H.C.W. Pump
Activation
H.C.W. Pump
Activation
Operation Mode
House Heating *
H.C.W. Priority
House Heating
H.C.W. Priority *
42 Oc | 55 Oc
C.H. Setpoint D
42 Oc | 55 Oc
C.H. Setpoint D

11
heated up before heating up water in radiators.
While in the H.C.W. Priority mode, the letter B is displayed in the bottom right corner
of the main screen.
.8.c) Parallel Pumps
In this mode, the pumps start to run in parallel above the pump activation temperature
(set by default to 35OC). These temperatures may, however, vary depending on user
settings. This will cause irregular activation of the pumps. However, when both
thresholds are exceeded, the pumps will operate simultaneously. The central heating
pump runs continuously, while the hot consumption water pump stops after the setpoint
temperature is reached in the water heater.
While in the Parallel Pumps mode, the letter R is displayed in the bottom right corner
of the main screen.
ATTENTION: In this mode, a non-return valve should be fitted to maintain different
temperatures in the water heater and in the house. After activation of the parallel
pumps function, three items appear on the display. Starting from the left, these are:
Boiler Temperature (C.H.); Water Heater Temperature (H.C.W.) and Setpoint
Temperature (C.H.).
.8.d) Summer Mode
When the function is enabled, only the hot consumption water pump is running in order
to heat water in the water heater. The pump is switched on above a predefined
activation threshold (see the pump activation temperature function) and will run until
the setpoint temperature has been reached. The pump will start again when the
temperature drops below the set hysteresis. In the Summer Mode, only the setpoint
temperature is set on the boiler that heats up water for the water heater (the
temperature set for the boiler is also the temperature set for the water heater).
While in the Summer Mode, the letter L is displayed in the bottom right corner of the
main screen.
.9. Main Screen
This function allows you to change the view of the main screen. The following views are
available:
➢C.H. SCREEN
H.C.W. Priority
Parallel Pumps *
Parallel Pumps
Summer Mode *
42 Oc | 55 Oc
C.H. Setpoint R
45 Oc 43 Oc 55 Oc
C.H. H.C.W. Set L
OPERATION MODE
MAIN SCREEN

12
This screen displays the current and setpoint C.H. temperatures. By turning the
knob, you can change the setpoint temperature. After setting the appropriate value,
confirm it by pressing the encoder knob.
➢H.C.W. SCREEN
This screen displays the current and setpoint H.C.W. temperatures. By turning the knob,
you can change the setpoint H.C.W. temperature. After setting the appropriate value,
confirm it by pressing the encoder knob.
➢FLUE GASES SCREEN
The following items are displayed, starting from the left: current C.H.
temperature, current flue gases temperature and blow power in percentages. This view
is used for monitoring current boiler parameters.
.10. Language
With this function, you can select the language of your controller.
.11. Factory Settings
The regulator has been pre-configured. However, it should be adjusted to your
individual needs. It is possible to return to the factory settings at any time. By enabling
the Factory Settings, all existing boiler settings will be replaced by settings made by
the manufacturer. From then on, you can again set your own operating parameters for
the boiler.
.12. Fitting parameters
Access to fitting parameters is disabled for the user. This special view contains advanced
parameters accessible only by the manufacturer.
III. Protections
In order to ensure a safe and faultless operation, the regulator has been provided with
Fixed C.H. Pump
Factory Settings
Yes
No
23 Oc | 55 Oc
C.H. Setpoint
•C.H. SCREEN
H.C.W. SCREEN
C.H. SCREEN
•H.C.W. SCREEN
H.C.W. SCREEN
•FLUE GASES
SCREEN
45 Oc 93 Oc 80% *
C.H. FLUE FAN L
44 Oc | 55 Oc *
C.H. Setpoint R
43 Oc | 50 Oc
H.C.W. Setpoint R

13
numerous protections. In the case of an alarm, an acoustic warning is sounded and the
display shows a corresponding message.
Press the encoder to restore the controller to operation. In the case of the C.H.
Temperature Too High alarm, wait until the temperature drops below the alarm value.
.13.Thermal protection
The boiler is protected with an additional bimetal sensor (located at the boiler
temperature sensor) that disables the fan when the temperature exceeds the critical
value: 85OC. This is to prevent water from boiling in the system when the boiler has
been overheated or the controller is damaged. When the protective function is enabled
and the temperature drops to a safe value, the sensor will automatically restart the
device and the alarm will be deactivated. If the sensor is damaged or overheated, the
burner, fan and feeder are disabled.
.14. Automatic Sensor Check
When the temperature sensor of the central heating or hot consumption water is
damaged, an alarm is sounded with an additional indication shown in the display, e.g.:
„C.H. Sensor Damaged".
Blow is disabled and both pumps are activated simultaneously, regardless of
the temperature.
If the central heating sensor is damaged, the alarm will remain active until the sensor
is replaced. If the hot consumption water sensor is damaged, pressMENU to deactivate
the alarm and restore the single (house heating) pump mode. To be able to operate
the boiler in all modes, it is necessary to replace the sensor.
.15. Temperature Protection
The regulator features an additional protection in case the bimetal sensor is damaged.
After the temperature exceeds 85OC, the alarm is sounded with the display showing the
following message:
The current temperature is read from an electronic sensor and processed by the
thermoregulator. When the alarm temperature is exceeded, the fan is shut off and both
pumps begin to run in order to distribute hot consumption water throughout the system.
.16. Anti-Boil Protection
This protective function is used only with the water heater priority mode. For
example, when the water heater setpoint temperature is 55OC and the boiler
temperature rises to 67OC (5OC over the so-called priority temperature), the controller
Alarm
Temperature Too High
Alarm
C.H. Sensor Damaged

14
shuts off the fan.If the boiler temperature reaches 80OC, the C.H. pump will be
activated. If the temperature continues to rise, the alarm will be activated at 85OC.
Such condition may appear when the water heater or the pump is damaged or when
the sensor has been improperly installed. However, if the temperature drops, the
controller will activate the fan at 66OC and it will remain in the duty mode maintaining
the priority temperature of 62OC.
.17. Monitoring the flue gas outlet temperature
This sensor constantly monitors the flue gas outlet temperature. If the
sensor is damaged, disconnected from the controller or removed from the flue conduit,
Flue Gas Sensor Damaged massage will appear on the display. This will cause the
controller to switch to the emergency mode. In such case, only boiler temperature is
used. The controller is operated using only the boiler sensor and the zPID function
remains active without the flue gas outlet sensor.
.18. Fuse
The regulator has a network protection WT 3.15 A tube fuse. Higher current ratings
may cause damage to the controller.
IV. Maintenance
Before and during the heating season, the EU-88zPID controller should be checked for
condition of its cables. You should also check if the controller is properly mounted and
clean it if dusty or dirty. It is advisable to measure grounding parameters for the motors
(central heating pump, hot consumption water pump and fan).
EU-88zPID Technical Specifications
Power supply
230V ±10% /50Hz
Maximum power consumption
5W
Ambient working temperature
5÷50°C
Pump max. output load
0,5A
Fan max. output load
0,6A
Temperature measurement accuracy
1°C
Sensor thermal resistance
-30÷99°C
Flue gas sensor thermal resistance
-30÷480°C
Fuse
3,15A
23 Oc 98 Oc 50%
C.H. Flue Fan D

15
V. Assembly
ATTENTION: all assembly works must only be carried out by qualified persons. During
assembly, the device must be disconnected (make sure the power cord is unplugged)!
ATTENTION:improper cable connections may damage the regulator!
The regulator may not be operated in a closed-circuit central heating system. It is
necessary to provide for safety valves, pressure valves and a surge tank in order to
prevent water from boiling in the central heating system.
.19. Cable Connection Diagram for Controller
Pay special attention to cable connections during assembly. Especially, the ground wire
should be connected properly.

16