Danfoss VSH Instructions page 6

Instructions
dryer, expansion valve, etc.), refrigerant charge.
• L ow 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).
• C ompressor 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:
• V erify that safety devices are operational and
properly set.
• E nsure that the system is leak tight.
• C heck the compressor current draw.
• C onfirm that the system is operating in a way
consistent with previous maintenance re-
cords and ambient conditions.
• C heck that all electrical connections are still
adequately fastened.
• K eep the compressor clean and verify the ab-
sence of rust and oxidation on the compres-
sor shell, tubes and electrical connections.
• C heck the internal temperature of the fre-
quency converter on its display and the coo-
ling air flow.
• F aults 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.
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FRCC.EI.005.A3.02 - Sept. 2010
13 - Warranty
Always transmit the model number and serial
number with any claim filed 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 off
the power.
The product warranty may be void in following
cases:
• A bsence of nameplate.
• E xternal modifications; in particular, drilling,
welding, broken feet and shock marks.
• C ompressor opened or returned unsealed.
• R ust, water or leak detection dye inside the
compressor.
• U se of a refrigerant or lubricant not approved
by Danfoss.
• A ny deviation from recommended instruc-
tions pertaining to installation, application or
maintenance.
• U se in mobile applications.
• U se in explosive atmospheric environment.
• N o 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.
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