Raychem HWAT-ECO Mode D'emploi page 19

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 pro-
grammed 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 initialise 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 procedure.
12. reinitialize
If "Yes" is selected the Quick install menu is activated and all settings are
returned to factory settings.
13. Sound alarm
Inside the unit a smal buzzer sounds during an error condition.
With this setting you can switch the sound into different modes: continuous,
10 minutes, 1 minute, 10 seconds or off.
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
19