ENGO CONTROLS EPC12HW User manual

Introduction
The controller is designed to control CH and HW pumps. CH pump turns
ON when boiler temperature exceeds user setpoint temperature. HW
pump work depends on the temperature dierence. HW pump turns
on when boiler temperature exceeds the temperature of the tank by
hysteresis value set by user. HW pump works until the temperature of
the boiler and the temperature of the tank will be equal or setpoint
temperature of the tank will be achieved.
Product Compliance
This product complies with the essential requirements and other
relevant provisions of the following EU Directives: EMC 2014/30/EU,
RoHS 2011/65/EU.
Safety Information
Use in accordance to national and EU regulations. Use the device as
intended, keeping it in dry condition. Product for indoor use only. In-
stallation must be carried out by a qualied person in accordance to
national and EU regulations.
Before carrying out any activities related to the power supply
(connecting wires, device installing etc.), make sure that main power
is not connected to the controller! Incorrect wiring connections may
cause device damage.
Quick Guide
EPC12HW | Controller for CH pump and HW pump
Ver. 1
Release date: III 2023
www.engocontrols.com
Distributor:
QL CONTROLS Sp z o.o. Sp. k.
43-262 Kobielice
4 Rolna St.
Poland
Producer:
Engo Controls S.C.
43-200 Pszczyna
ul. Górnośląska 3E
Polska
PC
Technical specication
Power supply 230 V / 50Hz
Max load of the CH pump output 3 (1) A
Max load of the DHW pump output 3 (1) A
Temp. measurement range 0 – 99°C
Setpoint temp. range for CH 5 – 80°C
Setpoint temp. range for DHW 20 – 80°C
Sensor temp. range -10 – 120°C
CH sensor cable lenght 1,5m
DHW sensor cable lenght 3m
Dimension [mm] 155 x 70 x 39
Controller description
1. Power supply indicator
2. CH pump operation
indicator
3. HW pump operation
indicator
4. Display
5. Increasing setpoint
temperature or value
6. Menu button
7. Decreasing setpoint
temperature or value
8. Controller power supply
9. CH pump power supply
10. HW pump power supply
11. HW temperature sensor
12. CH temperature sensor
13. ON/OFF power supply
switch
13
8 9 11 1210
1 2 3 4
7
65

Wiring diagram
P Function (priority)
With the priority enabled, the pumps are prioritized. HW pump turns
on rstly and then, after reaching setpoint temperature of the HW
tank - CH pump starts to work. With the priority turned o pumps are
working independently without priority for the HW pump.
To activate priority, press and hold button until the „P” and „L”
letters will appear on the display. Use or buttons to se-
lect„P”and then conrm your selection with button. Use or
buttons to activate (ON) or deactivate (OFF) priority function.
Conrm the selection with button.
Hysteresis and setpoint temperatures for CH and HW pumps can be
changed by pressing button (menu option). On the display will
appear ashing letter„C”,„U”, or„H”and at this point we can change
the desired setpoint temperatures using or buttons. After few
seconds controller will go itself into operating mode and display the
current temperature.
Controller operation
C– activation temperature of the CH pump above the set value
(setting range 5-80°C).
U– maximum reservoir temperature
(deactivates the DHW pump above the set value, setting range 20-80°C).
H- hysteresis of switching on the HW pump ( setting range 5-30°C).
L function (summer mode)
To activate summer mode, press and hold button until the „P”
and „L” letters will appear on the display. Use or buttons to
select „L” and then conrm your selection with button. Use
or buttons to activate (ON) or deactivate (OFF) summer mode.
Conrm the selection with button.
This function deactivates CH pump. Only HW pump is running
and CH pump will turn on only when boiler reaches 90°C temperature
- protecting function will protect boiler against overheating.
230 V AC
Hot Water
T
T
RADIATOR
HEATING
Manual mode
Manual control of the CH and HW pump depends on the operation
mode and safety rules in the central heating phase (overheating).
Holding down the and buttons will enable / disable the
central heating pump for continuous operation. Holding down the
and buttons will enable / disable the hot water pump for
continuous operation. The hot utility water pump turns o always
after reaching the maximum temperature of the reservoir or until the
temperatures are equal.
Histeresis
This is the dierence between setpoint temperature of the pump start
and setpoint temperature of the pump stop. For example:
1. For the central heating system, the controller has a constant 2°C
hysteresis. After setting the temperature in the„C” parameter, eg at
30 °C, the pump will be turned on after exceeding 30 °C, and it will be
turned o when the temperature drops below 28 °C.
2. In the HW system, after setting the temperature in the„U”parame-
ter to 50 °C, the H.W pump will be turned o when the temperature
exceeds 50 °C. However, it will be activated when the temperature
drops below the„U-H”value.
Additional functions
Controller has an„anti-stop”function which protects pump against lime
scale when there is no heating season. Pump is turned on every 14 days
for 15 seconds.
An additional protection is the frost protection function, which runs
pump permanently when temperature on the sensor drops below 5°C.
BOILER
CH
PUMP
HW PUMP
CH
SENSOR
HW
SENSOR
Alarm
The controller is equipped with an acoustic alarm signaling:
- Too high temperature on the boiler 90 ° C.
- Short circuit in the CH sensor
E1 - short circuit in the CH sensor
E2 - broken CH sensor
E3 - short circuit in HW sensor
E4 - broken HW sensor
If the E1 or E2 error is displayed, the CH pump works all the time until
the fault is removed.
Error Code
PLEASE NOTE!
Tank temperature preview is available on pressing the button.
After a few seconds, the controller will return to displaying the boiler
temperature.
Tank temperature preview