Direct Digital Controller
100
Direct Digital Controller fw 4.013 – Ed. 01/2013
Heating
Type
GAHP-GS/WS GAHP-A
GAHP-AR
AY
Priority(1)
1 2 2 3
Priority(2)
2 1 1 3
Priority (1): Priority has been given to GAHP-GS/WS units.
Priority (2): Priority has been given to other units.
The order of operating priority corresponds to the numerical order indicated in the table (1 = highest priority,
3 = lowest priority).
4.4.2.6.7
Temperature Alarm Setup (Master DDC only)
This option allows the user to set the alarm temperatures for hot and/or chilled water production plants.
For a chilled-water-only production plant, or a two-line hot/cold plant in cooling mode, an error is generated if
the temperature is higher than that set.
For a hot water production plant, or a two-line hot/cold plant in heating mode, an error is generated if the
temperature is lower than that set.
It is possible to:
Disable the function;
Specify whether the limit indicated refers to outlet or inlet water temperatures.
The factory default values are:
Cooling: 110°C (230° F);
Heating: -30°C (-22° F).
Instructions for configuring the alarm temperature:
1 - Select from the initial screen to gain access to the main menu.
2 - Select
to gain access to the System installation.
3 - Enter the installer password on the numerical keypad that appears on the display.
4 - Select
“Plants”
from the drop-down menu.
5 - Select the
symbol for two-line cooling/heating plants,
for hot water production plants,
or
for chilled water production plants.
6 - Turn the knob to scroll the cursor downward until highlighting “Base plant part” and press the knob.
7 - Turn the knob to scroll the cursor downwards until “Temp. Alarm setup” is selected and press the knob to
access the screen.
8 - Position the cursor on next to the option to be set (outlet water temperature, inlet water temperature)
and press the knob to select it.
9 - Position the cursor on the temperature value to be set. Press the knob. The number starts to flash. Turn
the knob to modify the value and press the knob to confirm.
The limit temperature value appears only if the function is enabled (Disabled ).
10 - Position the cursor on to select the cooling plant; select
to select the heating plant.
11 - To exit, select
.
Repeat steps 5 to 9 for the second plant if the DDC is the Master DDC for two plants.
NOTE
NOTE
NOTE
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