Airedale Ultima Compact Condensing Unit 30kW - 450kW - Manual (Page 19)

Condensing Units ULTIMA COMPACT
Condensers & Condensing Units
19
Installation & Maintenance : 6259675 IM V1.4.0 10/2013
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Installation Data
PRESSURE TESTING In accordance with PED 97/23/EC, a strength test should be carried out in order to
ensure that all interconnecting joints, pipework and components are sufficiently strong to
cater for maximum permissible operating pressures. Once installation is completed, the
high side of the system should be strength tested with dry nitrogen to a recommended
minimum pressure of 27 barg and the low side to 17 barg.
CAUTION Pressure testing can be dangerous if not properly conducted, personnel
undertaking pressure testing MUST be technically competent and suitably
qualified.
When installation is complete, the system should be pressure tested.
Fill the system with dry nitrogen to a pressure of between 17 bar/250psig and 34bar/
500 psig.
Record the pressure over a minimum of 60 minutes to detect major leaks (a 24 hour
period should preferably be allowed).
If a reduction in pressure is detected, trace the leak and repair before conducting a further
pressure test and charging.
EVACUATION Evacuation for systems operating with R407C refrigerant to be carried out as follows (for
alternative refrigerants please refer to Airedale).
Use a high vacuum pump and connect to the high and low pressure sides of the system
via a gauge manifold fitted with compound gauges. A high vacuum gauge should be fitted
to the system at the furthest point from the vacuum pump.
Triple evacuation should be used to ensure that all contaminants are removed.
Operate the vacuum pump until a pressure of 1.5 torr (200 Pa) absolute pressure is
reached, then stop the vacuum pump to break the vacuum using oxygen free Nitrogen
until the pressure rises above zero.
The above operation should be repeated a second time.
The system should then be evacuated a third time but this time to 0.5 torr
absolute pressure.
Break with the correct refrigerant, until pressures equalise between the charging bottle
and the system.
ELECTRICAL
General  As standard the equipment is designed for 400V, 3 phase, 3 wire 50Hz and a
separate permanent 230V, 1 phase, 50Hz supply, to all relevant IEE regulations,
British standards and IEC requirements.
 A fused and isolated electrical supply of the appropriate phase, frequency and
voltage should be installed.
 The control voltage to the interlocks is 24V. Always size the low voltage interlock
and protection cabling for a maximum voltage drop of 2V.
CAUTION Wires should be capable of carrying the maximum load current under non-fault
conditions at the stipulated voltage.
 Avoid large voltage drops on cable runs, particularly low voltage wiring.
 Once the connecting pipework is complete the electrical supply can be connected
by routing the cable through the appropriate casing hole and connecting the
cables, refer to the Wiring Diagram supplied with each unit.
CAUTION A separately fused, locally isolated, permanent single phase and neutral supply
MUST BE FITTED for the compressor sump heater and control circuits, FAILURE to
do so could INVALIDATE WARRANTY.