GB.COOLDX.INST.090301
We reserve the right to alter specifications.
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4
ELECTRICAL CONNECTIONS
Important
Electrical installations must be carried out by an authori-
sed electrician.
4.1 Connection to power supply
Connection to the mains power supply must be wired
across the safety isolating switch on the front panel of the
cooling unit. Remove the four screws on the safety switch
enclosure and remove the lid. There are knockout holes on
the sides of the enclosure serving as cable lead-throughs.
Connect the 400 V power supply (5-conductor system,
except for the size 60 CoolDX in capacity variant 3 that has
a 4-conductor system) directly to the safety isolating switch,
which has four normally-closed contact functions (three for
the size 60 CoolDX, capacity variant 3). The terminal for the
incoming earth conductor is situated right next to the safety
switch. See sketch.
The ambient temperature and the way the cable is placed
must be taken into account when sizing the power cable.
Technical data, see Section 10.
To connect the cable to the GOLD
Connect the communication cable to any of the bus con-
nections on the control unit. See encircled area in sketch.
.
Use one of the holes in the oblong rubber clad cable
gland on the back side of the junction hood of the elec-
trical cubicle, to extend the cable to control unit. See
sketch.
Push aside part of the cable gland to insert the com-
munication cable through it. Connect the cable to an
optional bus connection on the control unit. Adjust the
length of cable inside the electrical cubicle and adjust its
position through the cable gland. Refit the cable gland
back to its correct position.
An extra outdoor air temperature sensor is required if
any of the following functions are activated in the GOLD
air handling unit: outdoor compensation, cooling step
blocking, cooling boost, summer night cooling, CoolDX
comfort control and pump control for the heating coil.
Use the TBLZ-1-30 accessory for mounting an outdoor
air temperature sensor in the ductwork upstream of the
CoolDX. Use the TBLZ-1-24/25 for installing the outdoor
air temperature sensor outdoors.
If outdoor air temperature readings are obtained via
communication to the GOLD air handling unit, then no
extra temperature sensor is needed.
Factory
mounted
cables
Connect power
supply here
4.2 To connect the communication cable
Only one communication cable is required for transferring
information between the controls of CoolDX and the GOLD.
All operating status and other information can be accessed
and read in the hand-held micro terminal of the GOLD unit.
The communication cable is pre-wired to the electrical
equipment inside the CoolDX unit and is coiled up behind
the inspection door.
The communication cable is to be lead out through the
predrilled hole in the cover plate on the inspection side of
CoolDX. First fit the rubber sleeve, supplied, into the predril-
led hole to serve as a cable gland. Then lead the communi-
cation cable in a secure manner through the rubber sleeve
and from the CoolDX to the junction (wiring) hood of the
GOLD.