8510197P03 © Danfoss Commercial Compressors April-2007
Instructions
the refrigerant pressure tables (pressure-tempe-
rature), the superheat and the sub-cooling, etc.
(if additional charge is deemed necessary, refer
to the
“Filling the system”
section).
•
Compressor short cycling:
The number of cy-
cles shall never exceed 12 starts per hour.
12 - Maintenance
•
Performer® compressors do not necessitate
any special maintenance procedure. However,
it must be recalled that proper operations and
maintenance of the system serve to prevent
against system-related compressor problems.
The following preventive maintenance checks,
to be performed at regular intervals, are highly
recommended:
•
Control operating conditions (evaporating
temperature, condensing temperature, com-
pressor discharge temperature, temperature
difference on heat exchangers, superheat, sub-
cooling). These conditions must always remain
within compressor operation limits.
• Verify that safety devices are operational and
properly set.
• Check the compressor oil level and qua-
lity; this step may include an acid test, humidity
check, spectrometer analysis, etc. whenever the
oil becomes discolored.
• Ensure that the circuit is leak tight.
• Verify the proper operation of heat exchan-
gers and, if necessary, clean them.
• Check the current draw on the compres-
sor motor as well as proper voltage balance
between phases.
• Check that all electrical connections are still
adequately fastened.
• Make sure the compressor is clean and in
good working order; verify the absence of rust
on the compressor shell, piping and electrical
connections.
• Make sure the refrigerant charge is suitable
for both winter and summer operation.
•
Ensure that periodic in-service inspections re-
quired by local regulations are performed.
13 - Replacement
Precaution must be taken when disconnec-
ting, cutting or drilling holes in the tubing to
ensure that no refrigerant under pressure is pre-
sent in the system.
The refrigerant shall not be discharged di-
rectly into the atmosphere; rather, it must be re-
moved using approved reclamation techniques
and equipment and then safely stored, in accor-
dance with applicable legislation.
The presence of refrigerant vapor can displace
air and lead to suffocation. Proper ventilation
is mandatory at all times when servicing the
equipment.
A refrigeration system component change
must be carried out in compliance with local re-
gulations.
•
Make sure that the main power supply has
been switched off.
•
Before replacement, it is necessary to deter-
mine the cause of failure and implement reme-
dial action. If such analysis and repair are not
performed, repetitive failure may occur.
Note that an oil acidity test always proves help-
ful in diagnosis when undertaking compressor
replacement.
•
Check that the new Performer® compressor
and the on-site compressor to be replaced dis-
play the same electrical and refrigeration per-
formance characteristics.
•
Use the rubber grommets and gaskets sup-
plied with the new compressor.
•
Whenever piping needs to be modified, please
refer to the “Safety measures prior to assembly”
section.
•
For further details on replacement steps, refer
to the previous sections of this manual.
• Danfoss recommends not to throw away a used
compressor but to dispose of the com-
pressor and its oil at a specialised recy-
cling company site.
Note: In the event of motor failure, flush and clean
the entire circuit before replacing the compressor
in order to remove acids and contaminants. Syste-
matically install a new filter dryer on the liquid line.
Prior to this step (if necessary), run the system for
at least 2 hours with anti-acid cartridges (in such
instances, the installation of a suction filter might
also be required). After an operating period of ap-
proximately 2 weeks, check the level of oil acidity. If
the oil acid test proves positive, drain and replace
the oil, replace the anti-acid liquid line filter dryer
cartridges and the suction filter previously instal-
led. Repeat oil and filter dryer replacements until
the system is clean and acid-free. When there is
no longer any sign of acidity, replace the anti-acid
cartridges by the standard model and remove the
suction strainer cartridge as required.
14 - User advisory
Insist that all service operations only be per-
formed by qualified personnel.
The compressor and tubing surface tempera-
tures may exceed 100°C (212°F) and cause severe
bodily burns. Special precaution must be taken
when working around the compressor and refri-
gerant tubing. Moreover, a compressor in ope-
ration can generate very cold surface tempera-
tures (as low as -25°C / -13°F), thereby exposing
personnel to the risk of freezing burns.
Pressure inside the compressor can reach dan-
gerously high levels (e.g. abnormal operation,
fire,...) leading to personnel injury if suddenly
released; therefore, never drill, weld or cut the
compressor shell and adjacent tubing (release
of liquid refrigerant can cause flash freezing on
exposed skin).
Be aware that the product warranty may be
deemed null and void in the following cases:
•
external modifications to the compressor (ab-
sence of nameplate, drilling, welding, broken
feet, shock marks),
•
compressor opened by the user or returned
unsealed (i.e. open discharge or suction ports),
•
presence of rust or water inside the compressor
•
addition of leak-detection fluid in the lubricant
•
use of a refrigerant or lubricant not approved
by Danfoss Commercial Compressors,
•
any deviation from recommended instructions
pertaining to installation, application or mainte-
nance,
•
use in mobile applications (boats, trains, trucks,
etc.) or under explosive atmospheric conditions
(the compressor connecting box is not explo-
sionproof).
The date of production of the compressor is
indicated on the nameplate. Ensure that the
model and serial number information is always
transmitted with any claim filed regarding this
product.
