Manual code 75803707A.0708
Page 32 of 64
5 CHECKS AND FIRST STARTUP
WARNING!
BEFORE CARRYING OUT ANY OPERATIONS ON THE UNIT, SET THE MAIN
SWITCH TO POSITION “O”
Before the Manufacturer’s personnel proceed with the testing and startup of the machines, the checks listed in
the following form must be carried out.
DATE
PLACE
OPERATOR’S SIGNATURE
CUSTOMER’S SIGNATURE
Checks to be carried out before calling technician for startup
Machine startup with the refrigeration circuit requires that the units are powered on for at least two hours prior to
the arrival of the technician in order to allow the compressor’s crankcase oil heater to reach working temperature
and allow evaporation of any refrigerant deposited in the compressor to ensure that the compressors functions
correctly. The crankcase heaters switch on automatically when the machine is powered on.
REFRIGERANT CIRCUIT CHECKS
DESCRIPTION POSITIVE NEGATIVE
1
Check discharge pipe diameter conforms with indications in the installation
manual.
2
Check 'horizontal’ sections of the discharge line have a gradient of at least
1% in direction of refrigerant flow
3
Check that siphons are installed at the lowest point of each rising pipe and
every 3 m along rising pipe sections, as well as a counter siphon at the
highest point of the rising pipe.
4
Check the non-return valve is installed as near as possible to the
compressor with the aperture in the direction of refrigerant flow (pipes
longer than 5 m).
5
Check the non-return valve is installed as near as possible to the
compressor with the aperture in the direction of refrigerant flow (pipes
longer than 10 m)
6
Check that the discharge pipe is insulated in the sections where accidental
operator contact is possible (pipe temperature in operation approx. 70/80°C)
7
Check that support brackets are installed on the discharge pipe every 3 m
and are not too tight so as to allow expansion of the pipe.
8
Check liquid pipe diameter conforms with indications in the installation
manual.
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