T9901018-1
Page 12 of 26
Electrical Supply to the Dry Cooling Unit
(Left Hand Side of the Unit)
All electrical wiring and connections MUST be carried out by a competent
qualified electrician in accordance with the latest edition of the IEE wiring
regulations and/or local statutory regulations. (see also Wiring Diagram on Page
13)
A 2-pole local isolator having a contact separation of at least 3mm on both live and
neutral poles must be fitted in the 230V electrical supply to the Thermoscreens dry
cooling unit and located in an accessible position within 1m of the unit. This local
isolator will also serve as the On/Off switch for the fans inside of the cooling unit.
The unit must be connected using cables having an appropriate temperature rating
(heat resistant).
Ensure that the supply cables, circuit breakers and other electrical installation
equipment are correctly sized for the cooling unit.
0.5kW for cooling unit
Rated Electrical Power Input =
+
kW rating of water pump installed
2.7A for cooling unit
Rated Current =
+
Amps of water pump installed (max. 2A)
IMPORTANT:
Please note that the water pump is supplied and fitted by the
installer and the electrical power consumption of it (kW and Amps) is entirely
dependent on which pump the installer selects, see Section ‘Design Information’
Page 3 & 4 for water pump selection. The electrical feed to operate the water
pump is a 230V/1ph/50Hz switched feed that comes from the dry cooling unit
(terminal Pu L), so the sizing of the electrical supply to the dry cooling unit must
also include for the pump as well.
NB.
If the rated current of the water pump(s) is more than 2A an interface
relay/contactor will need to be used, powered from terminal Pu L, and the pump
electrical feed may then be from a separate electrical supply.
A 20mm size cable gland or conduit connector should be used for the
230V/1ph/50Hz Electrical Supply into the unit. See Figure 1, Page 8 showing
where the electrical supply enters the unit.
This appliance must be Earthed.
Connect the 230V/1ph/50Hz Electrical Supply to terminals L, N and Earth in the
dry cooling unit.
