MAXICAL
®
III
5511-229 GB/98.06/Rev. B1
12
4.1 General Installation Requirements
MAXICAL
®
III must not be installed in an area where the ambient
temperature exceeds 0...+55°C. If the average ambient tempera-
ture lies above +35°C, the internal lithium back-up cell should be
replaced every two years. At lower ambient temperatures, the
back-up cell will last for approx. 8 years. Lithium back-up cells
are standard spare parts - order no. 1606-047. Chapter 14.2
describes how to replace the battery.
All signal cables must be laid individually, e.g. in cable conduits.
They must not be laid parallel to supply or mains current cables.
Parallel cabling can only be advised if the cables are kept at least
25 cm apart.
COMBITEMP temperature sensors may only be used in direct
installation, when the flow velocity is less than 3m/sec. Sensor
pockets must be used if the flow velocity is larger.
NOTE:
When delivered MAXICAL
®
III shows information code 012 as
both temperature sensors have been disconnected during transport.
Having installed MAXICAL
®
III info is reset by activating both
front plate buttons for 10 sec. until the display says ”Call”.
4.2 Voltage supply (27-28)
MAXICAL
®
III should be connected to a 230 V AC net supply.
Live and neutral connected to terminals 28 and 27. Any earth wire
should not be connected, as the instrument contains doubly
insulated transformers.
