Raychem HWAT-ECO User manual

HWAT-ECO (Version 2)
R
Electronic Temperature Control Unit
For energy saving operation of HWAT-R/-M/-L heating cable
Mikroprozessorgesteuerter Temperatursteller
Für den energiesparenden Betrieb der
Temperaturhaltebänder HWAT-R/-M/-L
Modulateur de puissance électronique
Pour une utilisation économique des rubans HWAT-R/-M/-L
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3
148 mm
1
2
A
B
C
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10 20 30 40 50 60 70 80 90
0
HWAT-ECO
!
esc
5
4
3
2
7
1
6
B
A
22-08-2001 09:30
Maintain *8
2x
2x
HWAT 230V
HWAT-ECO
!
esc
11
12
13
9
10
14
HWAT-ECO-10
R
Electronic TemperatureControl Unit
For energy saving operation of HWATheating cable
Mikroprozessorgesteuerter Temperatursteller
Zum energiesparenden Betrieb der TemperaturhaltebänderHWAT
Modulateur de Températureelectronique
Pour l'application economique des rubans HWAT
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0100 110 120 130 140 150 160 170 180
mm
7
6
3
2
1
4
5
8
Description of indicator lights, buttons and display
See diagram in flip-out coverpage
Indication lights
1(green LED) Power supply ON.
(green LED) Power to heater on.
(green LED) Legionella prevention.
100% power to the heating cable. (Increased risk of scalding)
(green LED) Temperature limit warning: boiler temperature too
low.
(red LED) Error, see chapter 4.
Key Esc: Escape from current menu without changing actual
selection or value.
Key Enter : Use to confirm selected choice, menu or value.
Arrow Keys : to change menu selection or positioning
the cursor.
Display functions6
The display has two lines with
16 characters each. The display shows the
following text on start up:
After finishing quick install the display
shows date, time, temperature mode and
a star to indicate that the unit is unlocked.
Packaging content
See diagram in flip-out coverpage
The box contains the following parts:
HWAT-ECO unit
Manual
Two screws
Two washers
Temperature sensor with 4 metre cable
Aluminium tape for sensor mounting
B
A
Quick install
Any key to start
22-6-2001 09:13
Maintain *
9
10
11
12
13
14
!
esc
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ENGLISH
Description of indicator lights, buttons and display.............................. 4
Contents .............................................................................................. 6
1. Description ...................................................................................... 8
2. Installation ........................................................................................ 10
3. Operation .......................................................................................... 14
4. Error/ Alarms and Troubleshooting .................................................. 22
5. Appendix .......................................................................................... 24
DEUTSCH
Beschreibung der Anzeigeleuchten, Tasten und Anzeige ...................... 37
Inhalt .................................................................................................... 38
1. Beschreibung .................................................................................. 40
2. Installation ........................................................................................ 42
3. Betrieb .............................................................................................. 46
4. Fehler/Alarme und Fehlerbehebung .................................................. 56
5. Anhang ............................................................................................ 58
FRANCAIS
Description des témoins, boutons et écrans ........................................ 72
Table des matières ................................................................................ 73
1. Description ...................................................................................... 75
2. Installation ........................................................................................ 77
3. Utilisation ........................................................................................ 81
4. Erreurs, alarmes et guide de dépannage .......................................... 91
5. Annexes ............................................................................................ 93
RHWAT-ECO
5
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1. DESCRIPTION...................................................................................... 8
1.1 Purpose ........................................................................................ 8
1.2 Technical data .............................................................................. 8
1.3 Care and maintenance .................................................................. 9
2. INSTALLATION .................................................................................... 10
2.1 Disassembling the unit ................................................................ 11
2.2 Wall mounting instructions .......................................................... 11
2.3 Installation of cables and sensors ................................................ 11
2.3.1 Wiring diagrams .................................................................. 11
2.3.2 Minimum power cable sizing .............................................. 12
2.3.3 Heating cable ...................................................................... 12
2.3.4 Sensor cable........................................................................ 12
2.3.5 Alarm wiring ........................................................................ 13
2.3.6 Network .............................................................................. 13
2.3.7 Building Management System (BMS).................................. 13
3. OPERATION ........................................................................................ 14
3.1 Quick install .................................................................................. 14
3.1.1 Language ............................................................................ 14
3.1.2 Year/ Month/ Day /Hour/ Minutes ........................................ 14
3.1.3 Cable type............................................................................ 14
3.1.4 Cable length ........................................................................ 14
3.1.5 Ambient temperature .......................................................... 14
3.1.6 Country................................................................................ 15
3.1.7 Maintain temperature .......................................................... 15
3.1.8 Economy temperature.......................................................... 15
3.1.9 Pre-Programs ...................................................................... 15
3.1.10 Trace boiler ........................................................................ 16
3.2 Menu overview.............................................................................. 17
3.3 Menu explanation.......................................................................... 18
3.3.1 Language ............................................................................ 18
3.3.2 Time and Date...................................................................... 18
3.3.3 Setup .................................................................................. 18
3.3.4 Timer program and legionella prevention............................ 20
3.3.5 Holiday ................................................................................ 22
3.3.6 Info ...................................................................................... 22
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4. ERROR/ALARMS and TROUBLESHOOTING ...................................... 22
5. APPENDIX .......................................................................................... 24
5.1 Country code ................................................................................ 24
5.2 Pipe size, Insulation and Temperature .......................................... 24
5.3 Legionella prevention by temperature shock ................................ 26
5.4 Checklist for problem-free installation and safe operation............ 30
5.4.1 Typical installation schedule for the HWAT-Plus system...... 30
5.4.2 Circuit protection, Testing and Operation for all systems .... 30
5.5 Diagrams ...................................................................................... 32
5.5.1 Diagrams A, B, C, D, E, F, G and H, Installation .................. 32
5.5.2 Diagram I, Pre-programs .................................................... 34
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1. DESCRIPTION
1.1 Purpose
The HWAT-ECO control unit has been developed for operation with the fol-
lowing self-regulating heater range: HWAT-R, HWAT-M and HWAT-L. The
hot water temperature maintenance system is a comfort system providing
instant hot water at the tap.
A self-regulating heating cable is positioned on the pipe and compensates
for any temperature loss of the warm water.
The HWAT-ECO control unit combines the following features:
•The operating temperature of the heater can be limited to a desired tem-
perature. Combined with the integrated power off timer function, this
offers important energy savings.
•Energy can be saved, upon activation of the “trace boiler”function and
installation of the boiler sensor. The maintain temperature of the heater
will automatically be lowered in case the boiler temperature is reduced,
preventing the heater from using too much energy for heating the boiler
water.
•On big warm water systems it is sufficient to program one HWAT-ECO
(= MASTER). The other ECOs (= SLAVES) will automatically copy the
MASTER settings when connected to it.
•HWAT-ECO can be connected to a BMS. The input of a remote DC volt-
age will set the desired maintain temperature.
•An alarm terminal makes errors remotely readable.
1.2 Technical data
Switching capacity 20 A / 230 VAC
Use Only for HWAT-R/-M/-L heating cables
Off- power 2,5 VA max.
Power cable section entry 1,5 - 4 mm2for fixed wiring only
Auxiliary cable section entry up to 1,3 mm2(16 AWG)
Automatic switching Type 1 action, according to EN60730
Weight 880 g
Size 165 mm x 85 mm x 71 mm
Mounting options Wall mount with two screws or DIN rail.
Cable glands (entries) 2 x M20 and 1 x PG13.5 with 3 inputs
for external wires of 3-5mm
Master/slave cable 2-wire twisted pair, max. 1,3mm2core
and insulation of 500V
Alarm contacts Max. 24VDC, or 24 VAC, 1A, SPST,
Voltage free
Protection level IP 54
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Selectable temperature 41˚C up to 65˚C in 48 blocks per day.
Pre-programs 9 editable built-in building specific
pre-programs
BMS interface 0 –10 V DC
Master/Slave Master is selectable in the unit, up to
8 slaves can be connected
Approval VDE according to EN60730
EMC According to EN 50081-1/2 for emission
and EN50082 - 1/2 for immunity
Circuit breaker max. 20 A, C-Characteristic
Real Time Clock Automatic Summer/Winter time and
Leap year correction
Clock backup time 8 hours ±10%
Clock accuracy ±10 minutes per year
Settings All settings are stored in non-volatile
memory.
Operating temperature 0˚C to 40˚C ambient
Housing material ABS
1.3 Care and maintenance
To clean the HWAT-ECO use a soft cloth, water and soap, do not use sol-
vents. Do not pour water directly on the device. Do not use a water hose or
high pressure cleaner.
In case of defect please return the unit to a qualified repair service or to
the local Tyco Thermal Controls representative.
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2. INSTALLATION
This chapter is for installation purposes only, it contains no operational
information. The installation and, if necessary the maintenance and the
disassembling, must be carried out by a qualified electrical installer. The
installation must be compatible with local regulations.
Check the maximum circuit length for your circuit breaker in the next
table:
Fig. 1
Maximum circuit length at 230 VAC and for 20°C start-up temperature
C-characteristic HWAT-L HWAT-M HWAT-R
circuit breaker (Yellow) (Orange) (Red)
10A 80 m 50 m 50 m
13A 110 m 65 m 65 m
16A 140 m 80 m 80 m
20A 180 m 100 m 100 m
Multiple units on multiple power point can be used if longer heating cables
are required. Up to 9 units can be connected on three phase systems via
the network configuration.
2.1 Disassembling the unit
Always switch off the mains supply (circuit breaker) before opening the
unit. Several touchable parts inside the unit are directly connected to
the mains voltage.
The HWAT-ECO has a removable top lid. Both top and bottom of the box
have electronic parts and are connected to each other by a 14-pin connec-
tor. First unscrew the four screws in the lid. Pull the lid carefully upwards,
not sideways! Inside the unit an ABS separation sheet will help to guide
the connector when disconnecting. See 5.5 Diagrams and .
Closing the box
Position the lid in front of the wall-mounted bottom unit. The separation
sheet inside the unit will help to guide the lid and the connector. Push the
lid gently towards the bottom unit, the last part will offer some resistance
because of the connector pins.
2.2 Wall mounting instructions
The unit has two mounting options.
1. Inside the bottom part there are two holes, with the two supplied
screws and sealing rings the unit can be mounted to a wall.
HG
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2. The second mounting option is DIN-rail mounting.
For both options see the diagram with ruler on the flip-out cover page.
2.3 Installation of cables and sensors
Tyco Thermal Controls insists on the use of a 30 mA residual current
device and a C-characteristic circuit breaker to provide maximum safety
and protection from fire.
2.3.1 Wiring diagrams
There are three wiring diagrams: C, D and E (see 5.5 Diagrams).
For connection of a single unit: Diagram pag. 32
F1: Circuit breaker 20 A max. (C-Characteristic).
F2: Residual current device 30 mA.
For multiple unit connection on one phase system: Diagram pag. 33
F1, F3, F5: Circuit breaker 20 A max. (C-Characteristic).
F2, F4, F6: Residual current device 30 mA
For multiple unit connection on a three phase system: Diagram pag. 33
F1: Circuit breaker 3 x 20 A max. (C-Characteristic)
F2: Residual current device 3 x 30 mA
Double-pole electrical protection might be needed to comply with local
electrical standards.
2.3.2 Minimum power cable sizing
Fig. 2
C - Characteristic circuit breaker
10A 13A 16A 20A
Minimum cable size 3 x 1,5 mm23 x 1,5 mm23 x 1,5 mm23 x 2,5 mm2
Use solid core wires for 1,5 mm2diameters.
Ensure that the installation is compatible with applicable local electrical
requirements.
E
D
C
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2.3.3 Heating cable
Fig. 3
Achievable Ambient temperature
temperature
Heating cable 10°C 15°C 20°C 25°C
HWAT-L (Yellow) 41 - 44˚C 41 - 46˚C 41 - 50˚C 41 - 52˚C
HWAT-M (Orange) 41 - 50˚C 41 - 52˚C 41 - 56˚C 41 - 58˚C
HWAT-R (Red 41 - 64˚C41-66˚C41-68˚C41-70˚C
Above values are indications and depend on the insulation thickness.
Complete the heating cable tests (including the insulation resistance test)
in accordance with 5.4 (Checklist for problem-free installation and safe
operation).
2.3.4 Sensor cable
The temperature sensor should be connected to a single or master unit
only. Connect both wires of the sensor to the TEMP terminal in the unit
(PL4), see Fig. 4. The sensor wires do not have a special polarity. To con-
nect a wire use a screwdriver to push down the orange tab on the side of
the terminal. Put the wire into the hole and release the orange tab. The
sensor should be connected as near as possible to the boiler (5.5
Diagrams, ).
The metal tabs can be folded around the hot water output pipe. Use the
aluminium tape (included) to attach the sensor to the pipe. The sensor and
at least 200 mm of the sensor cable should be covered by insulation.
Be careful not to install the heating cable too close to the sensor, keep a
clearance of at least 20 cm.
The temperature sensor cable can be extended up to 100 meter. The wire
used to connect the temperature sensor to the HWAT-ECO should have a
basic insulation of 500 V and a solid core of at least 0,75 mm2.
2.3.5 Alarm wiring
The alarm contact (24 VAC, 24 VDC, 1A) inside the unit can be used to
switch an external device. The contact is open during an alarm. Normally it
is closed. In a network all alarm contacts should be connected in series.
The alarm terminal (PL6), see Fig. 4, is located in the upper right corner of
the unit and has the text “alarm contact”next to it. To connect a wire use a
screwdriver to push down the orange tab on the side of the terminal. Put
the wire into the hole and release the orange tab. The wires used for the
alarm contact should have a dielectric strength of 500 V. See Chapter 4 for
A
12
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alarm relay conditions.
Note: For master/slave combination with alarm function, the alarms need
to be connected in series by a RS485 wire. Due to the limited amount of
holes in the sealing ring of the cable gland, the alarm wire and BMS wire
can be combined in a 4 wire cable.
2.3.6 Network
See 5.5 Diagrams, diagram . The HWAT-ECO unit can be used in a sys-
tem with up to 9 units. All units should be connected to each other on the
A and B inputs in parallel on terminal (PL3), see Fig. 4. This means that
several units will have two wires together in one hole. Twist the two wires
together before putting two wires into one hole. The wire should be a
twisted pair and have a dielectric strength of 500V. The total maximum
length of this cable between all units is 100 m. Be careful not to mix A and
B connections. To connect a wire use a screwdriver to push down the
orange tab on the side of the terminal. Put the wire into the hole and
release the orange tab.
2.3.7 Building Management system (BMS)
See 5.5 Diagrams, diagram . The BMS input of the HWAT-ECO is an
analogue 0 to 10 Volt input. If the unit is programmed to have a BMS
connection, this will override any time program-
ming (see BMS page 19). Connect both wires of
the 0-10 V output to the BMS terminal (PL5)
inside the HWAT-ECO. Connect the ground wire
to the “–” and the
0-10 V output to the “+”terminal. To connect
a wire use a screwdriver to push down the
orange tab on the side of the terminal Put the
wire into the hole and release the orange tab.
The wires used to connect BMS to the HWAT-ECO
should have a dielectric strength of 500 V.
To connect a wire use a screwdriver to push
down the orange tab on the side of the terminal.
Note: Due to the limited amount of holes in the
sealing ring of the cable gland, the alarm wire
and BMS wire can be combined in a 4 wire cable.
B
B
B A TEMP BMS
+ -
PL3 PL5PL4
PL6
Alarm contact
Terminals
inside the
HWAT-ECO.
Fig. 4
13
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3. OPERATION
The HWAT-ECO version 2 has six buttons: Up/Down/Left/Right arrows,
Enter and Escape.
In the table on the next page is an overview of all menu items. Press any
button, except ESC, to enter the menu. When ESC is pressed the unit
shows the current requested water temperature. The unit will exit the
menu automatically after five minutes of key inactivity.
3.1 Quick install
When the unit is powered up for the first time, a quick setup must be exe-
cuted before the unit is ready to start. The quickstart helps to set all
important settings, the unit will start automatically when done. Quickstart
is sufficient for normal operations. More settings are available in the Setup
menu for special installations.
During the quick start the ESC button can be used to go back to a previous
menu. On startup the display will show the following text:
Press a key to start, and the following menus appear:
3.1.1 Language
With the up/down arrow keys you can choose between 5 languages,
English, German, French, Danish or Italian. Press Enter to confirm your
choice.
3.1.2 Year/ Month/ Day /Hour/ Minutes
Select the year with the up/down arrow keys and press Enter to confirm.
Then select and enter the Month, Day, Hour and Minutes.
3.1.3 Cable type
Use the up/down arrow keys to select the HWAT-R, HWAT-M or HWAT-L
cable. Select the type of cable used in your installation. Press Enter to con-
firm your choice.
3.1.4 Cable length
The minimum cable length is 1 m. The maximum cable length depends on
cable type and circuit breaker capacity (See installation). Use the up/down
arrow keys to select from 1 to the maximum length (see page 10 for max.
length). Press Enter to confirm your choice.
3.1.5 Ambient temperature
The ambient temperature is the temperature inside the room where the
heating cable is installed. Use the up/down arrow keys to select from 0˚C
to 25˚C. Press Enter to confirm.
Quick install
Any key to start
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3.1.6 Country
Select a country in this menu. This is used to set the default values for
pipe diameter and insulation thickness. For more information see
Appendix 5.1, page 24.
3.1.7 Maintain temperature
The maintain temperature is the water temperature that you set for normal
use. The temperature can be selected using the up/down arrow keys.
The minimum temperature is 41˚C or the economy temperature, whichever
is higher. The maximum temperature depends on cable type, pipe thick-
ness, insulation thickness and ambient temperature (see Fig. 3, page 12).
The programmed maintain temperature can be displayed by pushing the
escape key once the system is in operation.
3.1.8 Economy temperature
The economy temperature is the water temperature for periods during
which hot water is not usually tapped (at night) or when lots of hot water
is tapped (peak period). The temperature can be selected using the
up/down arrow keys. The minimum temperature is 41˚C and the maximum
temperature is the selected maintain temperature.
3.1.9 Pre-Programs
The HWAT-ECO has 8 default timer programs. See 5.5.2 Diagrams,
page 35 for more information. A pre-program can be selected using the
up/down arrow keys. Press Enter to confirm your choice. HWAT-ECO takes
a few seconds to copy the default program to the internal memory. During
this time a row of dots will show in the display.
Fig. 5
Program name Diagram number Building type
Constant I - 0 Constant temperature
Apartments I - 1 Apartment block
Family Home I - 2 Family home
Prison I - 3 Prison / Barracks
Hospital I - 4 Hospital
Nursing Home I - 5 Nursing home
Hotel I - 6 Hotel
Sport Centre I - 7 Sport centre / Swimming pool
Convalesc. Home I - 8 Convalescent home
esc
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3.1.10 Trace boiler
The trace boiler setting is included to ensure that the heating cable temper-
ature does not exceed the boiler temperature. The boiler temperature is
measured with the external temperature sensor. The HWAT-ECO memo-
rizes the highest measured temperature over the last 24 hours. With the
up/down arrow keys the setting can be altered between OFF and ON with a
selected temperature difference from 5°C to max 15°C between boiler tem-
perature and maintain temperature. Press Enter to confirm your choice. If
the boiler temperature is too low the maximum temperature is lowered to
the boiler temperature minus the trace temperature. In this case the trace
boiler LED will be on.
Finishing “Quick install”
Press Enter to start the unit.
With ESC it is possible to retrace all menu items to check the settings.
After starting the unit the display shows date, time, temperature setting
and a * to indicate that the unit is unlocked.
Back to “Quick install”
The Setup menu (see next chapter) has a Reinitialise menu to start over
again.
Previous settings are returned to default factory settings, except time and
date.
Note:
A menu can be consulted if further detailed settings (eg. Master/slave,
BMS, etc.) are required. You must press a key to access the menu inside
the HWAT-ECO. (Pressing ESC shows the current preferred cable tempera-
ture.) Pressing another key shows the main menu. There are 6 main
menus: Language, Time and Date, Setup, Timer program, Holiday and Info.
22-6-2001 09:13
Maintain *
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3.2 Menu overview
1 Language English
Deutsch
Francais
Dansk
Italiano
2 Time and Date 1 Year Select Year
2 Month Select Month
3 Day Select Day
4 Hour Select Hour
5 Minutes Select Minutes
3 Setup 1 Maintain Temp "Enter maintain temp."
2 Economy Temp "Enter economy temp."
3 Cable Length "Enter cable length"
4 Ambient Temp. "Enter ambient temp."
5 Pipe Diameter Select 15 mm up to 100 mm
6 Insulation Select 9 mm up to 100 mm
7 Power Corr Select 60% up to 140%
8 Trace Boiler Select Off or On_5 up to On_15 degrees
9 Lock Lock/unlock Setup and Timer menus
10 BMS Select Yes/No
11 NetworkMaster Select Yes/No
12 Reinitialise Select Yes/No
4 Timer program 1 Default program Constant
(password check Apartements
if Lock is On) Family home
Prison
Hospital
Nursing home
Hotel
SportsCentre
Convalesc.Home
2 Edit program Monday Edit timer for Monday
Tuesday Edit timer for Tuesday
Wednesday Edit timer for Wednesday
Thursday Edit timer for Thursday
Friday Edit timer for Friday
Saturday Edit timer for Saturday
Sunday Edit timer for Sunday
5 Holiday setting 1 xx Days off
2 Off
3 On
6 Info Show firmware version nr. + Cable type + Sensor temp.
(password check
if Lock is On)
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3.3 Menu explanation
3.3.1 Language
Select one of 5 languages using the up/down arrow keys: English, German,
French, Danish or Italian. Press Enter to confirm your choice.
3.3.2 Time and Date
Select Year to set the year using the up/down arrow keys and press Enter
to confirm. Then select and set the Month, Day, Hour and Minutes.
3.3.3 Setup
When Lock is on (No star in the lower right corner) a password is needed
to access the following menus. After the correct password is entered the
setup menu is accessable. The unit locks again after 60 seconds timeout
(no keys pressed).
When lock is off the following menus are directly accessable.
1. Maintain Temperature
The maintain temperature is the water temperature that you set for normal
use. The temperature can be selected using the up/down arrow keys. The
minimum temperature is 41˚C or the economy temperature, whichever is
higher. The maximum temperature depends on cable type, pipe thickness,
insulation thickness and ambient temperature.
2. Economy Temperature
The economy temperature is the water temperature for periods during
which hot water is not usually tapped (at night) or when lots of hot water
is tapped (peak period). The temperature can be selected using the
up/down arrow keys. The minimum temperature is 41˚C and the maximum
temperature is the selected maintain temperature.
3. Cable Length
The minimum cable length is 1m. The maximum cable length depends on
cable type and circuit breaker capacity (see Fig. 1, page 10). Select from 1
to the maximum length for the selected cable type using the up/down
arrow keys. Press Enter to confirm your choice.
4. Ambient Temperature
The ambient temperature is the temperature inside the room where the
heating cable is installed. Select from 0˚C to 25˚C using the up/down arrow
keys. Press Enter to confirm.
5. Pipe Diameter
Set the pipe diameter using the arrow keys The value can be changed from
15 mm up to 100 mm. See Appendix 5.2, page 24 for more information.
6. Insulation
Set the insulation thickness with the arrow keys. The value can be changed
from 9 to 100 mm, but is limited by the pipe diameter. See appendix 5.2,
page 24 (‘Pipe size, Insulation and Temperature’) for more information.
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7. Power correction
Adjust the power setting for fine tuning the temperature.
See appendix 5.2, page 24 (‘Pipe size, Insulation and Temperature’) for
more information.
8. Trace Boiler
The trace boiler setting is included to ensure that the heating cable temper-
ature does not exceed the boiler temperature. The external temperature
sensor is used to measure the boiler temperature. See page 16 for more
information.
9. Lock
Lock On/Off can be selected using the up/down arrows and Enter to con-
firm. If ‘On’is selected a password must be entered using the left/right and
up/down arrow keys. Enter to confirm.
If lock is On, the Setup and timer menus are protected by the password.
After the password is entered the unit remains unlocked until five minutes
of key inactivity or the Lock ‘On’is selected again.
10. BMS
The Building Management System option is activated using this menu.
When set to “Yes”the unit responds only to the voltage applied to the
BMS terminal. For voltages ≤4 VDC: heater is OFF. For voltages between
4,1 VDC and 6,4 VDC: maintain temperatures as indicated in Diagram F,
Chapter 5.5. For voltages > 6,4 VDC: 100% power to the heater for
legionella prevention (in case HWAT-R). See page 13 for installation.
If Trace Boiler is ON, it overrules the BMS temperature setting if necessary.
11. Network Master
In large installations where more than 1 HWAT-ECOs are connected to
each other, one unit must be selected as Master. This unit should be fully
programmed and all slave units will use the Master settings.
The master unit sends commands to all slave units to switch them ON or
OFF. The timer program of the master unit will be used for all units in the
following way: Slave units on the same phase (max. three units) will have
a delayed ON and OFF. This way the start-up current of the cable will never
occur at the same moment for these units (A, B and C). Slave units con-
nected to a different phase will switch at the same time (1, 2 and 3).
After selecting Master: Yes the slave units will inilialise and show:
“Slave: x y”x= phase number (1 to 3) y= slave identification (A, B and C)
The master unit is always 1 A, the slave units will get their number and
identification automatically. Always check afterwards if all units have
unique id-numbers, if not check the RS485 cables and repeat this proce-
dure.
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12. Reinitialize
If “Yes”is selected the Quick install menu is activated and all settings are
returned to factory settings.
3.3.4 Timer program and legionella prevention
When Lock is ON a password is needed to access the following menus.
When lock is OFF the following menus are directly accessable (The display
shows a * in the lower right corner).
1. Default program
These programs are selected based on the typical water usage at the tap of
the concerned building. For example: a large amount of hot water will be
tapped in the morning around 7.00 am. Due to the continuous flow of hot
water in the pipes, the heat loss will be minimum and the heater can be off
power in order to save energy. Similar behaviour can occur during night
time. The choice of the optimum timer program for the application ensures
that the hot water temperature maintenance system works even more effi-
ciently. Any timer program can be edited to suit personnel requirements
(See 2 Edit program).
The following pre-programs are available.
Fig. 6
Program name Diagram number Building type
Constant I - 0 Constant temperature
Apartments I - 1 Apartment block
Family Home I - 2 Family home
Prison I - 3 Prison / Barracks
Hospital I - 4 Hospital
Nursing Home I - 5 Nursing home
Hotel I - 6 Hotel
Sport Centre I - 7 Sport centre / Swimming pool
Convalesc. Home I - 8 Convalescent home
The time tables of all pre-programs are given in appendix 5.2 diagram I,
page 35. After selecting a pre-program the HWAT-ECO shows a row of
dots on the display. This is because it takes a few seconds to program the
internal memory.
2. Edit program (incl. legionella prevention)
Timer programming is done graphically in 1/2 hour time blocks.
A block can be set to Off, Economy temp, Maintain temp, or 100% power
(100% only if HWAT-R cable is used).
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