Technical data

Precision Air Conditioning
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Precision Air Conditioning
Technical Manual : 6258867 F 07/2012
67
General Description
STANDARD FEATURES
A weatherproof mains isolator is fitted to ensure complete unit isolation of the electrical
panel during adjustment and maintenance.
Mains Electric Isolator
(CUS 3 - 12 & C 11 - 50)
Head Pressure Control - Standard (Stand Alone)
CUS 3 - 12
(Variable)
Head pressure is maintained by a factory fitted, pressure actuated, head pressure
controller which varies the speed of the fan(s) to provide optimum control under varying
ambient conditions.
C 11 - 50
(On/Off)
Head pressure control is maintained via a factory fitted on/off pressure switch rated to
IP54 for outdoor use as standard. Good control with ambients down to 0°C, below this
temperature variable speed controllers are recommended, available as an optional extra,
refer to the Optional Extras in this section for further information.
Units fitted with thermostatic expansion valves have the head pressure factory set to
17 Barg (247 psig).
Controls
(CUS 3 - 30)
The condensing unit are supplied with electro-mechanical controls to operate via a
cooling/heating signal from the indoor unit.
OPTIONAL EXTRAS
Corrosion Resistant
Coated Coils
In atmospheres where high corrosion is anticipated a corrosion resistant coating is
applied to the aluminium fins of either phenolic or epoxy, dependent upon size.
Coil Guards
(CS50)
Guards can be fitted to each of the outer coils to protect against damage.
Phase Rotation
Protection
(CUS 3 - 12)
A phase sequence relay is available for units containing 3 phase scroll compressors, to
prevent possible damage by running the compressor in the wrong direction.
Hot Gas Bypass
(CUS 3 - 12 Only)
To achieve capacity control during low load conditions or to maintain suction pressure
when used with fresh air systems, the hot gas bypass system will modulate the capacity
down to 40% of full load. A stub is provided for site connection of the hot gas line to the
local expansion device.
CUS 3 - 4
The hot gas option is supplied as a loose field fit kit
CUS 5 - 12
The hot gas option is factory fitted.
OUTDOOR UNIT