Installation, user and maintenance manual
– AY Condensing line, AY series
53
Figure 5�9
Centre distances of mounting holes for Direct Digital Controller (DDC).
LEGEND
Holes for mounting DDC’s to panel
horizontal: 168 mm
vertical: 158 mm
The DDC's operating temperature range is 0 - 50 °C. If the temperature of the room
where the DDC is installed falls below zero, it continues to operate correctly to -10 °C.
However, its LCD display may not be able to display data.
2) How to supply power to the Direct Digital Controller (DDC)
The DDC requires a low voltage power supply (24 V) with 230/24 V AC, 50/60 Hz safety
transformer; the minimum power requirement is 20 VA.
To power the DDC (off a transformer located in an external panel), proceed as follows
(see example in Figure 5.10 DDC - electric supply
→
54):
You will need: the appliance disconnected from the electricity supply; the external
electrical panel configured by the installation technician. Necessary equipment and
materials.
Make sure that the external electrical panel is equipped with a 230/24 V AC - 50/60 Hz
safety transformer, of at least 20 VA power.
Remove the DDC's back panel by undoing the 4 bolts securing it (detail "A" - Fi-
1.
gure 5.8 Direct Digital Control (DDC)
→
52).
Use an electrical power cord (minimum cross section: 2x0.75 mm
2.
2
).
Pass the power cord (DDC side) through the hole in the DDC's cover and hook
3.
up as shown in the example, with the following polarities:
terminal 1
= 24 V;
ter-
minal 2
= 0 V;
terminal 3
= ground.
Terminal
3
of the DDC's 4-pole connector (AL) must be, in any case, connected to a
ground plant (r≤0,1Ω). Terminal
2
of the DDC is connected internally to
terminal 3
, and
is thus also connected to ground. Make the grounding connection on the transformer
terminal connected to terminal
2
of the DDC. if the transformer already has one wire
grounded, it must be connected to this terminal.
On completion, close the DDC's back panel with the 4 bolts.
1.
Содержание AY Series
Страница 4: ...4 ...
Страница 6: ...6 START OF OPERATING PROCEDURE REFERENCE to another part of the manual or other document ...
Страница 16: ...16 ...
Страница 74: ...74 ...
Страница 81: ...Installation user and maintenance manual AY Condensing line AY series 81 ...