Raychem HWAT-ECO Handbuch Seite 19

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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