Installation and Commissioning 5
12
ST16135-00E
5.4
Electrical Installation (Fig. 5.2)
WARNING !
BEFORE STARTING WORK, ENSURE THAT THE
MAIN-LINE FUSES HAVE BEEN REMOVED FROM
THE DISTRIBUTION BOARD. PRECAUTIONS
SHOULD BE TAKEN TO PREVENT THEM BEING
REFITTED UNTIL THE INSTALLATION IS
COMPLETE.
Starter cables must be connected to the mains electrical supply
via a lockable, switched and suitably rated fused isolator. The
isolator should be positioned as near as possible to the
compressor with clear, unrestricted access.
To access starter terminals, unlock the starter door panel and the
front panel on HV30-HV45 with the key provided. Pass incoming
cables through the entry hole in the floor for HV04-HV22 or left
hand side panel and rear of starter panel for HV30-HV45.
Connect the three mains supply cables to the contactor terminals
marked L1, L2 and L3, and connect the earth cable to the earth
pin E. Ensure the connections are secure.
Fig. 5.2 - Electrical Connections to Starter
Terminal
Cable sizes specified on the circuit diagram are the minimum size
to suit a typical installation. If the compressor is located a long
way from the isolator and/or the ambient temperature exceeds
35°C, the cable size should be increased.
Refer to IEEE Regulations for electrical equipment installed in
buildings to determine the size required, pay particular attention to
the circuit diagrams provided.
Check that the transformer fuse is positioned to suit the supply
voltage of the installation.
Ensure all electrical connections are tight, high voltage supply to
contactors and incoming terminals are critical.
Close the starter door and secure with the key provided before
replacing the main line fuses.
5.5
Check Direction of Motor Rotation
WARNING !
READ HEALTH AND SAFETY PRECAUTIONS
BEFORE STARTING COMPRESSOR.
Ensure that the compressor is filled with approved oil and that all
plugs are fitted securely.
Refer to Section 9.6, Access Panel Removal to remove the top
panel so that the compressor pressure gauge can be viewed.
With the mains isolator on, press the green start button mounted
on the control panel and watch the pressure gauge.
Rotation is correct if the pressure display rises immediately, after
a few seconds if no pressure is displayed rotation is incorrect.
WARNING !
IF ROTATION IS INCORRECT, STOP THE
COMPRESSOR IMMEDIATELY. SERIOUS
DAMAGE WILL OCCUR IF THE MOTOR IS
ALLOWED TO RUN IN REVERSE.
ISOLATE THE ELECTRICAL SUPPLY.
Open the starter door and change over any two of the incoming
cables connected to the starter terminals L1, L2 and L3.
Close and lock the starter door to prevent unauthorised access
and switch the mains electricity supply on.
Restart the compressor and verify that direction of rotation is
correct by observing pressure rise on the compressor gauge.
Replace the top panel and close and lock both front and starter
panel doors.
Cooling fan operation is clockwise, single speed HV30-HV45 and
all RS units have automatic stop/start cooling fans that cut in at
85°C operating temperature.
Remove the cabinet filter from the lower half of the rear panel to
view the cooling fan through the mesh grill.
5.6
Regulated Speed Compressor Installation
Install as instructed for standard fixed speed compressors with the
same fuse sizes for a given power rating.
Circuit breakers (Type D) with motor starting characteristics of
suitable size may be used to protect the installation.
Starting currents will not exceed 150% motor full load current and
will generally be no more than 100% full load current.
Installations must be earthed in accordance with local regulations,
the use of RCDs is not recommended.
Water drain, filters or dryers fitted downstream of the compressor
discharge must be correctly sited to avoid excessive flow
restrictions to ensure stable operation of the speed control
system.
