RDZ DHW User manual

Chiller and Heat Pumps
Chiller e pompe di calore
DHW CONTROL UNIT
QUADRO GESTIONE ACS
TECHNICAL MANUAL
MANUALE TECNICO
Control unit for Domestic Hot Water production with heat pump system
Centralina di controllo della produzione di ACS con pompa di calore
FAG0FC001AB.00
12/2018
bit.ly/rdzwebsite

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OPERATING AND INSTALLATION INSTRUCTIONS
Control unit for domestic hot water
production with heat pump system

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SUMMARY
1 INSTALLATION ................................................................................................................................................................ 5
1.1 GENERALITIES ......................................................................................................................................................... 5
1.2 DESCRIPTION .......................................................................................................................................................... 5
1.3 ADDITIONAL REQUIRED MATERIAL (NOT SUPPLIED)............................................................................................ 6
1.4 ELECTRICAL REQUIREMENT....................................................................................................................................6
1.5 INSTALLATION ........................................................................................................................................................ 6
1.6 WIRING ...................................................................................................................................................................7
1.7 WIRING DIAGRAM.................................................................................................................................................. 8
1.8 STARTUP ................................................................................................................................................................. 9
1.9 FUNCTIONAL DIAGRAM ...................................................................................................................................... 10
2 OPERATING INSTRUCTIONS .........................................................................................................................................11
2.1 USER INTERFACE...................................................................................................................................................11
2.2 STARTUP SEQUENCE.............................................................................................................................................11
2.3 PARAMETERS SETUP ............................................................................................................................................12
2.4 PARAMETER TABLE...............................................................................................................................................12
2.5 DIAGNOSTIC TABLE ..............................................................................................................................................15
2.6 EVENT LIST ............................................................................................................................................................ 15
2.7 SMART MANUAL OPERATIONS............................................................................................................................15
3 FEATURES .....................................................................................................................................................................17
3.1 DOMESTIC HOT WATER PRODUCTION ................................................................................................................17
3.2 RECIRCULATION MANAGEMENT .........................................................................................................................18
3.3 ANTI-LEGIONELLA.................................................................................................................................................18
3.4 ANTI-FREEZE MANAGEMENT ............................................................................................................................... 19
3.5 HEAT PUMP ALARM .............................................................................................................................................19
3.6 SMART ENERGY ....................................................................................................................................................19
DECLARATION OF CONFORMITY
This product is marked as it satisfies Directives:
•CEI EN 61000-6-1 (2007) Immunity for residential, commercial and light-industrial environments
•CEI EN 61000-6-3 (2007) Emission standard for residential, commercial and light-industrial environments
•CEI EN 60730-1 (2013) following DIRECTIVE 2014/30/EU + 2014/35/EU + 2011/65/EU
This declaration will become void in case of misuse and/or non observance though partial of manufacturer’s
installation and/or operating instructions
.

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IMPORTANT!
Please read before installation
This system meets strict safety and operating standard.
For the installer or service perso nit is important to install or service the system so that it operates safely and
efficently.
To start the warranty, the product must be started by an RDZ S.p.A service centre.
Reccomandations
• The personnel responsible for receiving the unit must conduct a visual inspection in order to identify all damage to
witch the unit may have been duringl transport .
For safe installation and trouble –free operation, you must:
• Carefully read thi instruction booklet before beginning.
• Follow each installation or repais step exactly as shown.
• Observe all local,state and national electrical an safety codes .
• Pay close attention to all warning and caution notice given in this manual.
• Supply the unit with a dedicated electrical line
Make install the unit by qualified personnel.
WARNING
This symbol refers to a hazard or unsafe practice wich can result in severe personal injury or death.
CAUTION
This symbol refers to to a hazard or unsafe practice wich can result in personal injury or product or property damage.
If necessary, get help
These instruction are all you need for most installation sites and maintenance conditions.
If you require help for a special problem, contact our sale/service outlet or your certified dealer for additional
instructions.
In case of improper installation
The manufacturer shall in no way be responsable for improper installation or maintenance services, including failure
to follow the instructions of this document.

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WARNING
ELECTRICAL SHOCK CAN CAUSE SEVERE PERSONAL INJURY OR DEATH. ONLY A QUALIFIED,
EXPERT ELECTRICIANS SHOULD ATTEMPT TO WIRE THIS SYSTEM.
• Do not supply power until all wiring and tubing are completed or reconnected and checked,to ensure the
grounding.
• Highly dangerous electrical voltages are used in this system. Carefully refer to the wiring diagram and these
Instruction when wiring.
Improper connections and inadequate grounding can cause accidental injuring and death.
• Ground the unit following local electrical codes.
• The yellow/green wire cannot be used for any connections different from the ground connection.
• Connect all wiring tighly. Loose wiring may cause overheating at connection points and a possible fire hazard.
• Don’t use multi-core cable when wiring power supply and control lines. Use separate cables for each type of line

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1 INSTALLATION
1.1 GENERALITIES
DHW Controller (or “control unit”) is a control and management device for domestic hot water production used with
HP Heat Pump units.
The control unit can drive an heat pump and an electric resistor (until 4 kW) to manage the various function by
optimizing the electrical consumption.
The main functions are:
•DHW production in storage tank
•DHW recirculating management
•Anti-legionella managemnt
•SMART-ENERGY management
•Anti-Freeze protection
1.2 DESCRIPTION
Box contents
•N° 1 DHW Controller
•N° 1 NTC Probe
•N°1 Instruction booklet
Hardware components
•Plastic box with transparent opening front 6 DIN modules
•Bipolar Magnetothermic protection 6KA 32A
•Fuse holder (10x38) for semiconductor ultra-rapid fuse (1 DIN module)
•Internal wiring for ricirculation pump and electric resistor.
Note: The ultra-rapid fuse is calibrated in order to unit characteristics, then you must indicate model in case of
substitution. Use only equal or equivalent fuses. The technical characteristics of the fuse are:
•I2T Triac (Tp 10mS) = 1000 A2s
•I2T Fuse < 1000 A2s
•Fuse current 25A 600Vac
•Breacking power 200KA
•Fuse Box 10x38
Hardware components of control board
•N° 2 relè output (dry contact)
•N° 2 NTC Probe sensor 10K 25°C Beta 3970
•N° 1 TRIAC driving resistor (MAX 4 kW)
•N° 1 I/O input 230Vac
•N° 3 7 segments display led (3 digits with decimal points)
•N° 4 report led
•N° 4 Keys
•Isolated and protected Power supply with delayed fuse (315 mA o 1 A)

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1.3 ADDITIONAL REQUIRED MATERIAL (NOT SUPPLIED)
•N° 1 Low voltage RELE (Recirculation pump buffer)
•Wiring: use insulated copper wires of type,section and lenght indicated in 1.6
•Cable Press
1.4 ELECTRICAL REQUIREMENT
•Before the installation, be sure that the voltage of power supply is the same as the one indicated on the
device
•All the electrical wiring must follow the local electrical codes.For details, call the dealer or an electrician.
•All the electrical wiring must be done by a specialized electrician.
1.5 INSTALLATION
It is recommended that the system be installed by a qualified tecnician, following the attached instructions
Positioning
•Make the holes for the electrical cables on the bottom of the box, following the existing tracks.
•Use a cable gland of the appropriate size for each hole.
•Fix the unit at the wall at maximum 2 m from the storage tank.
•Make the wiring of the NTC probes so as to have shorter connections possible.
Tip: Make three holes in witch to carry:
1. Power supply 230 Vac
2. NTC probes + relè output (R1, R2)
3. ALARM wire (from Acqua Unit) + electrical resistor driver cable

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1.6 WIRING
Lift the transparent cover, unscrew the two side screw and remove the cover.
There are a PTR10 connector, seven FASTON, six grouping and one separated for grounding, a magnetothermic
switch with output prewired to the unit and one prewired protection fuse for the electric resistor.
PTR 10 terminal block
•R1: N° 2 dry contact NA 6A 250V cosphy=1; driver for heat pump
•R2: N° 2 dry contact NA 6A 250V cosphy=1; driver for recirculation pump.It is advisable to use a low voltage
buffer relè . Refer to wiring diagrams for details.
•ALARM: N° 2 contacts for alarm / defrost signal from heat pump ( 230 Vac input)
•NTC1: N° 2 contacts for NTC probe from storage tank.
•NTC2: N° 2 contacts for NTC probe from return water line (optional, only for recirculation management)
FASTON description
•Faston (Power supply) Prewired to magnetothermic switch output.
•Faston (Protection fuse for electric resistor) Prewired to on-board fuse.
•Faston (Resistenza Elettrica) Electrical connection to the electric resistor of the storage tank.
•Faston T Grounding.

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1.7 WIRING DIAGRAM

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CABLES: LENGHT AND SECTION
Power supply cable A:
Multipolar electric cable; Cable ‘s section is indicated in the above table .
Cable must be H07RN-F type (CEI 20-19 CENELEC HD22). Make sure that the length of the wires between the cable
fixing point and the terminals is such that the active conductors are tended before the grounding conductor .
Connection cable B / C :
Multipolar electric cable Cable ‘s section is indicated in the above table.
The cable must not be lighter than H07RN-F type (CEI 20-19 CENELEC HD22).
1.8 STARTUP
PREFLIGHT
Electric circuit
•Good sealing of the cables on their connecting terminals. Badly tightened clamps can cause overheating of
the terminal block or malfunctions.
•Electrical cables insulated from any metal component.
•Separation between power supply cables and low voltage signal cables.
•Grounding.
Other
•Good stability of unit.
•No tools or other near the unit
A B C
S(mm²) S(mm²) S(mm²)
4 0.75 0.75

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1.9 FUNCTIONAL DIAGRAM
M
1
MONOBLOC HEAT PUMP
DHW tank for heat pump
DHW
controller
2
1
INPUT/OUTPUT
2
HYDRAULIC SYSTEM
26.3
Electric resistance
Recirculation
pump
LEGEND
shut-off valve
vibration dumping joint
Y-filter
safety relief valve
adjustable thermostatic mixing valve
water treatment system
check valve
temperature sensor
pre-adjustable automatic filling unit
dial manometer
three-way diverting valve
M
REF. INSTALLATION
MANUAL
DHW
COLD
WATER
COLD WATER
BUFFER TANK
HYDRAULIC SEPARATOR

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2 OPERATING INSTRUCTIONS
2.1 USER INTERFACE
LED STATE DESCRIPTION
1 Green Off Unit in standby
On Unit in operation, active request to heat pump
Blinking Unit in operation, no request to heating elements
2 Red Off Unit in operation
On Unit in stand-by, anti-freeze function available
Blinking Unit in ALARM (see section 2.5) or alarm/defrost active on external unit (if
connected)
3 Giallo Off Anti-legionella not active
On Anti-legionella active. Minimum disinfection temperature reached
Blinking Anti-legionella attivo. Minimum disinfection temperature not reached
4 Blu Off Electric Resistor off
On Electric Resistor on
KEYBOARD
5“ON-OFF”
6“DOWN”
7“UP”
8“SET”
2.2 STARTUP SEQUENCE
When the control unit has been connected correctly and is electrically powered, the display shows the firmware
version (e.g. "R11") for two seconds, then switch to the "main screen", in which the red LED is on at the first turn on
and the numerical display is.
Switch ON / OFF the DHW Controller
To turn on DHW Controller, press and hold the on-OFF button for two seconds until the red led turns off and the
green LED lights up. The DHW Controller unit is designed to stay on continuously.
To turn off DHW Controller, press and hold the on-OFF button for two seconds until the red LED turns on and the
others turn off.
The On/off status is maintained between two consecutive switching.

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2.3 PARAMETERS SETUP
USER ACCESS: Press the "SET" button for a brief moment to access the level 1 parameters
TECHNICAL ACCESS: Press the “SET” button for 2 seconds (access the Password entry page);
Use “UP” and “DOWN” to select characters, use “SET” to confirm the actual character
and place the cursor at the next position. Insert password “8 3 9”
Now accesses the device's configuration parameters, which change depending on access level.
Parameters settings procedure:
•To scroll the parameter list press “UP” or “DOWN”.
•To enter in selected parameter press one time “SET”. The display shows the parameter value.
•To modify the selected parameter hold “SET” for 2 seconds. The parameter value start blinking.
•Press “UP” or “DOWN” to set value.
•Press “SET” to confirm the setting or “ON-OFF” to restore original value. The display stops blinking. If no button
pressed for 2 minutes, the unit restore the original value and display stops
•Press “ON-OFF” to return at parameter list.
•Press “ON-OFF” to return to menu level 0 (ON state).
•If the uniti s in menu page level livello 1 or 2, in the parameter list and no button pressed for 2 minutes,
automatically return to level 0 (Main screen).
2.4 PARAMETER TABLE
Nr PARAMETER UNIT MIN MAX DEFAULT STATE DESCRIPTION
P.01 Desired tank temperature
(SETPOINT)
°C 40 80 50
P.02 Anti-freeze protection enabling - 0 1 1 0 = Anti-freeze protection
disabled
1 = Anti-freeze protection
enabled
See section 3.4
P.03 Maximum power to electrical
resistor
- 1 4 1 1 = 25% 2 = 50%
3 = 75% 4 = 100%
P.04 Anti-legionella manual start - 0 1 0 0 = Anti-legionella free
1 = Anti-legionella manual start.
This parameter resets to 0 after
starting cycle.
See section 2.7
P.05 Enter event list - - - - See section 2.6
P.10 Clock: hour setting - 0 23 -
P.11 Clock: minute setting - 0 59 -
P.12 Clock: day of week setting - 1 7 - 1 = Monday
…
7 = Sunday
P.13 Clock: day of month setting - 0 31 -
P.14 Clock: month setting - 1 12 -
P.15 Clock: year setting - 00 99 -
P.16 Anti-legionella frequency days 0 30 3 Minimum interval in days
between two anti-legionella
cycles.
Setting 0 disables Anti-
legionella cycles.

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P.20 Operation mode - 0 4 2 0 = OFF: Heating OFF (but
protections ON)
1 = ECO: Only heat pump
2 = SMART: Heat pump plus
integration resistor if the pump
is not enough
3 = FAST: Heat pump + resistor
together active
4 = BACKUP: Only resistor
P.22 SMART ENERGY enabling - 0 1 0 0 = OFF
1 = ON
See section 3.6 SMART ENERGY
P.50 Network frequency settings - 0 1 0 0 = 50 Hz
1 = 60 Hz
P.51 Recirculation settings - 0 3 1 0 = OFF
1 = ON 10% - OFF 90%
2 = % ON based on recirculation
NTC probe
3 = MAX
See section 3.2
P.52 PWM recirculation timing min 1 60 2 Recirculation pump activation
time if P.51 = 1 or 2.
See section 3.2
P.53 Minimum derivative recirculation
temperature
°C 0 20 5 Minimum recirculation
temperature increase in 60
min. See section 3.2
P.54 Max storage tank temperature °C 30 90 85
P.55 Min storage tank temperature °C 0 15 5
P.56 Heat Pump maximum
temperature
°C 40 58 50 Maximum temperature at
which the heat pump can carry
the tank . Beyond this
temperature the heat pump is
switched off and only the
electrical resistance is used (if
P.20 ≠0 and ≠1)
P.57 Tank temperature regulation
hysteresis
°C 1 30 17 See section 3.1
P.58 Minimum derivative tank
temperature
°C 1.0 20.0 5.0 Minimum tank temperature
increase in 60 min.
P.59 Derivative control timing min 1 120 30 Derivative control timing for
minimum derivative (P.58).
Note: For the first 30 minutes
of the heating cycle the
derivative is not checked .
See section 3.1
P.60 BPS bus RS485 (9600-19200-
115200)
- 1 3 1
P.61 Network adress Bus 485 - 0 255 1
P.62 Network Protocol - 1 3 1 1 = MODBUS slave
2 = MODBUS master
3 = SACBUS (owner)

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P.63 Protocollo variant - 1 2 1 1 = Standard
2 = Special
P.70 Minimum temperature curve
killing Legionella
°C 50 62 50 See section 3.3
P.71 Killing time at minimum
temperature
min 1 250 240 See section 3.3
P.72 Average temperature curve killing
Legionella
°C 55 69 55 See section 3.3
P.73 Killing time at average
temperature
min 1 250 120 See section 3.3
P.74 Istantaneous temperature curve
killing Legionella
°C 65 75 65 See section 3.3
P.80 Offset tank temperature probe °C -10.0 10.0 0.0 Correction to be applyed to
tank temperature probe
P.81 Offset recirculation temperature
probe
°C -10.0 10.0 0.0 Correction to be applyed to
recirculation temperature
probe
P.82 Enabling logging derivative alarm - 0 1 0 0 = Derivative alarm disabled
1 = Derivative alarm enabled
P.98 % using electrical resistor % 0 100 - Read only. Shows the using
power percent of the resistor
P.99 Default data - 0 1 0 Set to 1 to carry default data.

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2.5 DIAGNOSTIC TABLE
ERROR CAUSE LOGGED DISPLAY
E01 No ‘NET SYNC’ signal. Replace on board fuse Yes Yes
E02 Temperature derivative insufficient Only if P.82=1 Yes
E03 RS485 network error (future use) Yes Yes
E04 Tank temperature higher than T max (P.54) Yes Yes
E05 Tank temperature probe CC or disconnected Yes Yes
E06 Recirculating temperature probe CC or disconnected Only if P.51=1 Only if P.51=1
E07 SETUP data error Yes Yes
E08 SETUP data corrupted Yes Yes
E09 Tank temperature lower than T min (P.55) Yes Yes
E10 Triac control temperature probe CC or disconnected Yes Yes
EVENT DESCRIPTION LOGGED DISPLAY
d01 Legionella cycle start Si No
d02 Legionella cycle stop Si No
2.6 EVENT LIST
The event list is structured according to the following table:
The last 16 events (described in 2.5) are registered.
“ SET” button allows to move horizontally,”UP” and “DOWN” buttons allow to move vertically. The first row of the
table contains the last recorded event.
2.7 SMART MANUAL OPERATIONS
Smart setup temperature (setpoint)
Press one time “UP” button; Display shows, for 1 sec, “P.01”, then the setpoint value (blinking). Press “UP” and
“DOWN” to set the desired.
Press “SET” button to confirm and return to main page.
Press “ON-OFF” to restore the old value and return to main.
Boost mode starting
By activating the BOOST mode, the heat pump and the electrical resistance (at the maximum set power) are
immediately activated to reach the desired temperature in the shortest possible time. When the temperature is
reached, the BOOST mode automatically switches off.
To activate the BOOST mode, from the On state (red LED off) press “UP” key for two seconds;display shows "Bst" for
two seconds, then the function is activated and the water temperature in the tank is displayed.

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Manual starting anti-Legionella cycle
DWH Controller performs an automatic check to determine if it is necessary to initiate the anti-Legionella cycle
according to the procedure in section 3.3. However, you can manually start the loop by entering the configuration
menu, moving to parameter P. 04 and pressing the SET button. In this way it is forced to start the cycle and the
control unit goes back to the main page.
Automatic operations
At the first turn on, the control unit is in OFF state. In This state, the only ANTI-FREEZE feature is managed.
By pressing the Red STANDBY button for 2 seconds, the control unit switches to ON.
In ON state, the features 3.1, 3.2, 3.3 and 3.5 are handled (see relative sections).

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3 FEATURES
3.1 DOMESTIC HOT WATER PRODUCTION
The control parameters of this feature are:
P.01 Desired Set-point
P.20 Operating mode
P.20=0 OFF: Domestic hot water production disabled
P.20=1 ECO: Production with only heat pump
P.20=2 SMART: Production with heat pump + electric resistor by minimizing power consumption
P.20=3 FAST: Production with heat pump + electric resistor by minimizing working time
P.20=4 BACKUP: Production with only electric resistor
P.57 Tank temperature hysteresis
P.58 Tank temperature minimum derivative
P.59 Derivative control time

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3.2 RECIRCULATION MANAGEMENT
The Recirculating function allows you to enter the DHW circuit at the desired operating temperature. This reduces
the waste of water that occurs when a withdrawal occurs while waiting for the desired temperature to reach a
comfortable value.
The control parameters of this feature are:
P.51 Operating mode:
P.51 = 0 Recirculating disable
P.51 = 1 Temporal modulation with ratio 1/10:
Recirculation pump is ON for P.52 minutes, then OFF for 10xP.52 minutes
P.51 = 2 Thermo-regulation of recirculating line:
Recirculation NTC probe Needed;
this feature allows the recirculation pump turning when recirculation temperature increases
significantly.
This feature allows to save power consumption and working time of recirculation pump. If, at
the end of time ON (10xP.52), the temperature is not increased, the pump turn off anywaye
for OFF timing (10xP.52)
P.52 = 3 Recirculation pump always ON. Pump OFF only in STAND_BY state (RED LED on)
P.52 ON timing
P.53 Recirculating temperature derivative for switch off pump. Expressed in °c every 30 min
3.3 ANTI-LEGIONELLA
Legionella is a bacterium that, under certain conditions, can grow within a water system.
The proliferation of this bacterium depends on many factors and finds the best conditions to survive between 20°C
and 45°C.
This is why, although each country has its own local regulation for the prevention of Legionella, all of them still
provide water heating at a temperature higher than 50 °C.
The anti-Legionella cycle is a special function that is carried out by DWH Controller. The purpose of this function is to
heat the water in the tank so as to eliminate all the bacteria that may have developed inside the accumulation.
Anti-Legionella cycle stops when:
•Water temperature greater than 65 °C (Adjustable value by P.74 parameter)
•Water temperature greater than 55 °C (P.72) for 120 minutes (P.73)
•Water temperature greater than 50 °C (P.70) for 240 minutes (P.71)
The cycle is activated within a time set by P.16 patrameter (if P16 = 0, this feature is inactive).
During the cycle the yellow led remains lit if the temperature exceeds the minimum disinfection value (P. 70),
flashing otherwise.
It is possible that the electrical resistances are activated during the anti-Legionella cycle.
During the cycle, by analyzing the trend of the water temperature, the software realizes if the heat pump energy is
sufficient, otherwise it uses the electrical resistance according to the same logic used by the function 3.1
NOTE: The anti-Legionella cycle is critical to people's health; It is normally completed by heating from
thermodynamic sources. However, we cannot rule out that, in unfavourable weather conditions, the heat pump is
not able to complete the aforementioned cycle alone. For this reason it is obligatory to use the electrical resistance.
In case of disconnection of the electrical resistances, in certain operating conditions, it could happen that the anti-
Legionella cycle is not completed, the condition for which our company assumes no civil liability.