ow and pressure drops (solenoid valve, lter
dryer, expansion valve, etc.), refrigerant charge.
• Low refrigerant charge: The correct refrigerant
charge is given by the liquid sight glass indication,
the condenser delta T in relation to the refrige-
rant pressure tables (pressure-temperature), the
superheat and the sub-cooling, etc. (if additional
charge is deemed necessary, refer to section 8).
• Compressor short cycling: The number of
cycles shall never exceed 12 starts per hour.
12 - Maintenance
Internal pressure and surface temperature
are dangerous and may cause permanent injury.
Maintenance operators and installers require
appropriate skills and tools. Tubing and com-
presssor upper shell temperature may exceed
100°C and can cause severe burns.
Ensure that periodic service inspections to
ensure system reliability and as required by local
regulations are performed.
To prevent system related compressor problems,
following periodic maintenance is recommended:
• Verify that safety devices are operational and
properly set.
• Ensure that the system is leak tight.
• Check the compressor current draw.
• Conrm that the system is operating in a way
consistent with previous maintenance re-
cords and ambient conditions.
• Check that all electrical connections are still
adequately fastened.
• Keep the compressor clean and verify the ab-
sence of rust and oxidation on the compres-
sor shell, tubes and electrical connections.
• Check the internal temperature of the fre-
quency converter on its display and the coo-
ling air ow.
• Faults are logged in the frequency converter
memory and can be displayed. This can help
to evaluate and improve parameters of the
frequency converter or of the system itself.
13 - Warranty
Always transmit the model number and serial
number with any claim led regarding this pro-
duct.
Use the fault memory of the frequency conver-
ter to recover the fault descriptions before ini-
tializing the system and even before shutting o
the power.
The product warranty may be void in following
cases:
• Absence of nameplate.
• External modications; in particular, drilling,
welding, broken feet and shock marks.
• Compressor opened or returned unsealed.
• Rust, water or leak detection dye inside the
compressor.
• Use of a refrigerant or lubricant not approved
by Danfoss.
• Any deviation from recommended instruc-
tions pertaining to installation, application or
maintenance.
• Use in mobile applications.
• Use in explosive atmospheric environment.
• No model number or serial number transmit-
ted with the warranty claim.
14 – Disposal
Danfoss recommends that compressors,
frequency converters and compressor oil
should be recycled by a suitable company.
Danfoss Commercial Compressors http://cc.danfoss.com
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products
already on order provided that such alterations can be made without subsequential changes being necessary in specications already agreed.
All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
FRCC.EI.024.A1.02 - October 2012 Copyright Danfoss Commercial Compressors - 10/12
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