Power Supply; Operation - Danfoss HDU-SF Service Manual

Service Guide
5.2

Power Supply

▪ A 3.6 V DC lithium battery is fitted in the heat meter.
▪ The battery is not to be charged or short-circuited.
▪ Ambient temperatures below 40 °C extend the life of the battery.
▪ Used batteries must be disposed of according to the applicable regulations.
Caution!
Risk of explosion if the battery is replaced by an incorrect type.
5.3

Operation

Display
The meter readings are displayed with units and symbols on an 8-digit LCD.
1. Quadrant display
2. Loop display
3. Tarif enrgy
4. Error symbol
5. Maximum values
6. Flow rate indicator
Simple operation
A pushbutton mounted on the front of the meter is used to switch to the
various displays.
To show the data read out by the integrator in the display (e.g. amount of
energy, operating hours, volume of water, current temperatures, ...)., vari-
ous windows that can be called up in succession are used.
The meter has 6 different display loops: main loop, set day loop, informa-
tion loop, pulse input loop, tariff loop and month loop.
The window content of each loop is programmed with the standard infor-
mation ex works. Various display windows comprise two (seven) displays
that change successively at intervals of 2 - 4 s. The loops in the display are
numbered from 1 to 6 to help the user find his way around quickly. The
main loop (loop 1) is programmed with the current data as default setting,
e.g. for energy, volume, flow rate.
A few fragments of the loops or even whole loops can be turned off, using
the IZAR@SET software. It simplifies arrangement of the windows.
The pushbutton is used to switch through the various displays. The button can be pressed for a short or a long time:
Button press
Short press (< 3 seconds)
Long press (> 3 seconds)
Button not pressed for 4 minutes
Button pressed again
6
HDU-SF (Horizontal Distribution Units - Single Flat)
Result
Switches to the next display within a loop
Switches to the next display loop
Meter switches off the display automatically (to save power, but only if no error exists)
Meter shows the basic display
VIIGB102
V
ΔT ΔT
GPM
-V
ΔT
-V
1. Loop display (for loop 1)
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