Evco Ev3h94 Controller For Dhw Heat Pump Heaters Instruction Manual

EVCO EV3H94 Controller for DHW Heat Pump Heaters

OVERVIEW

• power supply 115… 230 VAC
•  DHW tank upper and lower probe, evaporator probe (PTC/NTC/Pt 1000)
•  photovoltaic, HP, and multi-purpose digital input (see i0)
•  compressor relay 16 A res. @ 250 VAC
•  alarm buzzer
•  TTL MODBUS slave port for EVconnect app, Epoca remote monitoring system or for BMS.

MEASUREMENTS AND INSTALLATION

Measurements in mm (inches). To be fitted to a panel, snap-in brackets provided.

INSTALLATION PRECAUTIONS 

•  the thickness of the panel must be between 0.8 and 2.0 mm (1/32 and 1/16 in);
•  ensure that the working conditions are within the limits stated in the TECHNICAL SPECIFICATIONS section;
•  do not install the device close to heat sources, equipment with a strong magnetic field, in places subject to direct sunlight, rain, dampness, excessive dust, mechanical vibrations, or shocks;
•  in compliance with safety regulations, the device must be installed properly to ensure adequate protection from contact with electrical parts. All protective parts must be fixed in such a way as to need the aid of a tool to remove them.

ELECTRICAL CONNECTION

•  use cables of an adequate section for the current running through them.
•  to reduce any electromagnetic interference locate the power cables as far away as possible from the signal cables.

PRECAUTIONS FOR ELECTRICAL CONNECTION 

•  if using an electrical or pneumatic screwdriver, adjust the tightening torque;
•  if the device is moved from a cold to a warm place, humidity may cause condensation to form inside. Wait for about an hour before switching on the power;
•  make sure that the supply voltage, electrical frequency and power are within the set limits. See the section TECHNICAL SPECIFICATIONS;
•  disconnect the power supply before carrying out any type of maintenance;
•  do not use the device as a safety device;
•  for repairs and for further information, contact the EVCO sales network.

FIRST-TIME USE 

•  Carry out the installation following the instructions given in the section MEASUREMENTS AND INSTALLATION.
• Power up the device as set out in the section ELECTRICAL CONNECTION: an internal test will startup.
• The test normally takes a few seconds; when it is finished the display will switch off.
• Configure the device as shown in the section Setting configuration parameters. Recommended configuration parameters for first-time use:

Then check that the remaining settings are appropriate; see the section CONFIGURATION PARAMETERS.

• Disconnect the device from the mains.
•  Make the electrical connection as shown in the section ELECTRICAL CONNECTION without powering up the device.
•  For the connection in an RS-485 network connect the interface EVIF22TSX or EVIF23TSX, to activate real-time functions connect the module EVIF23TSX, to use the device with the EPoCA remote monitoring system, connect the EVIF25TWX module, to use the device with the APP EVconnect connect the interface EVIF25TBX; see the relevant instruction sheets. If EVIF22TSX or EVIF23TSX is used, set parameter bLE to 0.
•  Power up the device.

USER INTERFACE AND MAIN FUNCTIONS 

Switching the device on/off

• `If the device is switched on, the display will show the P5 value (“DHW tank upper temperature” default); if the display shows an alarm code, see the section ALARMS.

EVCO S.p.A. | EV3H94 | Instruction sheet ver. 1.0 | Code 1043H94E104 | Page 2 of 6 | PT 05/21
Unlocking the keypad
Touch a key for 1 s: the display will show the label “URL”.

Setting the setpoint Economy 

Check that the keypad is not locked.

Setting the Comfort setpoint
Check that the keypad is not locked.

Setting the over post activation threshold
Check that the keypad is not locked

Activating manual defrost
Check that the keypad isn’t locked and that the anti-legionella and over-boost functions aren’t active.

Touch the UP key for 4s. If P4 = 1 or 2 (default), defrost is activated provided that the evaporator temperature is lower than the d2 threshold.

Silencing the alarm buzzer (if u9 = 1) 

Touch a key.

FUNCTIONS AND LOAD OPERATIONS 

Economy

• the compressor on if DHW tank lower temperature < “SP1 setpoint – r0 differential” and off if DHW tank lower temperature > “SP1 setpoint”
•  fans on if compressor on
•  heaters switched off in normal operation (on if needed during defrosting)

Comfort 

•  the compressor on if DHW tank lower temperature < “SP5 setpoint – r0 differential” and off if DHW tank lower temperature > “SP5 setpoint”
•  fans on if compressor on
•  heaters on, with a single probe configured (P3 = 0), if DHW tank upper temperature < “SP2 – r6 threshold – r7 differential” and off if DHW tank upper temperature > “SP2 – r6 threshold”.
•  heaters on, with two probes configured (P3 = 1), if DHW tank upper temperature < “SP2 – r0 differential” and off if DHW tank upper temperature > “SP2”.

 Anti-legionella
It activates at “H0 intervals” or at “Ant time”, provided that DHW tank lower temperature > “SP1 setpoint” and > “SP2 setpoint”

• compressor switched off
•  fans switched off
•  heaters switched on until DHW tank upper temperature > “H1 threshold” and then for “H3 time”.

Overboost

• It activates in manual mode, provided that DHW tank upper and lower temperature < “SP3 threshold”
•  compressor, fans and heaters on until DHW tank upper temperature > “SP1 setpoint”.

Defrosting
It activates with evaporator temperature < “d17 threshold” for “d18 time” or in manual mode, provided that the anti-legionella and over-boost functions are not active

• compressor switched on if d1 = 1
•  defrost relay active if d1 = 1 or 2
•  fans switched on if d1 = 2
•  heaters switched on to prevent too high-temperature drop in the storage tank

 Photovoltaic system

• It activates with photovoltaic input active
• operation as in comfort mode, except for “SP2 setpoint” which becomes “SP6 setpoint”.

 Green

•  It activates with multi-purpose input active and DHW tank upper and lower temperature > “SP8 setpoint”
•  compressor switched off
•  fans switched off
•  heaters switched off.

Antifreeze

• This function is used to prevent water freezing. It is activated when tank upper temperature < “SP7 setpoint” – “r0 differential” and this function is deactivated when tank upper temperature > “SP7 setpoint”
•  heaters are switched on.
• This function can be activated only if the controller is on standby.

Pre-opening hot gas defrost valve

• This function is used to balance the pressure at the compressor start-up, and it is activated only if “d1” = 3.
• This function switch on the defrost output “i11” seconds before the start-up of the compressor, this occurs every time the compressor started, even if there is no defrost request.

5.10 Fan operation

• The fan operates depending on the active function, normally C12 seconds before the switch-on of the compressor. There are some exceptions:
• defrost: in the case of hot gas (d1=1) compressor is active but the fan is off. In case of com-pressor stop (d1=2), the compressor is off but fan is active
•  alarms: in case of LHP compressor is off but fan is active.

ADDITIONAL FUNCTIONS 

Activating/deactivating comfort operation in manual mode 

Activating the overboost function 

Displaying the operating mode

Displaying/deleting compressor functioning hours 

SETTINGS

Set the date, time and day of the week (if module EVIF23TSX, EVIF25TWX or interface EVIF25TBX is connected) 

•  Do not disconnect the device from the mains within two minutes since the setting of the time and day of the week.
•  if the device communicates with the connect app, the date, time, and day of the week will be automatically set by the smartphone or tablet.

Restoring factory settings (default) 

•  check that the factory settings are appropriate; see the section CONFIGURATION PARAMETERS.

 CONFIGURATION PARAMETERS

ALARMS

TECHNICAL SPECIFICATIONS