Instructions
8510306P01AB - AN382129347378en-000101 | 3
© Danfoss | Climate Solutions | 2021.08
9 – Verification before commissioning
Use safety devices such as safety pressure switch
and mechanical relief valve in compliance with both
generally and locally applicable regulations and
safety standards. Ensure that they are operational
and properly set.
Check that the settings of high-pressure switches
don’t exceed the maximum service pressure of any
system component.
• A low-pressure switch is recommended to avoid
low pressure operation.
Minimum setting for R454C/R455A 1.0bar (absolute) / 14.5psia
• Verify that all electrical connections are properly
fastened and in compliance with local regulations.
• When a crankcase heater is required, it must be
energized at least 24 hours before initial start-up
and start-up after prolonged shutdown.
10 – Start-up
• Never start the compressor when no refrigerant is
charged.
• Do not provide any power to the compresor
unless suction and discharge service valves are
open, if installed.
• Energize the compressor. It must start promptly.
If the compressor does not start, check wiring
conformity and voltage on terminals.
• Eventual reverse rotation can be detected by
following phenomena; the excessive noise,
no pressure differential between suction
and discharge, and line warming rather than
immediate cooling. A service technician should
be present at initial start-up to verify that
supply power is properly phased and that the
compressor is rotating in the correct direction. For
LLZ compressors, phase monitors are required for
all applications.
• If the internal overload protector trips out, it must
cool down to 60°C / 140°F to reset. Depending on
ambient temperature, this may take up to several
hours.
11 – Check with running compressor
Check current draw and voltage. Measurement
of amps and volts during running conditions must
be taken at other points in the power supply, not in
the compressor electrical box.
•
Check suction superheat to reduce risk of
slugging.
• Observe the oil level in the sight glass (if provided)
for about 60 minutes to ensure proper oil return to
the compressor.
• Respect the operating limits.
•
Check all tubes for abnormal vibration.
Movements in excess of 1.5 mm / 0.06 in require
corrective measures such as tube brackets.
•
When needed, additional refrigerant in liquid
phase may be added in the low-pressure side as far
as possible from the compressor. The compressor
must be operating during this process.
• Do not overcharge the system.
• Never release refrigerant to atmosphere.
•
Before leaving the installation site, carry out
a general installation inspection regarding
cleanliness, noise and leak detection.
• Record type and amount of refrigerant charge
as well as operating conditions as a reference for
future inspections.
12 – Maintenance
Internal pressure and surface temperature
are dangerous and may cause permanent injury.
Maintenance operators and installers require
appropriate skills and tools. Tubing temperature
may exceed 100°C / 212°F 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.
• Confirm that the system is operating in a way
consistent with previous maintenance records
and ambient conditions.
•
Check that all electrical connections are still
adequately fastened.
• Keep the compressor clean and verify the absence
of rust and oxidation on the compressor shell,
tubes and electrical connections.
• Acid / moisture content in system and oil should
be checked regularly.
13 - Warranty
Always transmit the model number and serial
number with any claim filed regarding this product.
The product warranty may be void in following
cases:
• Absence of nameplate.
•
External modifications; 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 instructions
pertaining to installation, application or
maintenance.
• Use in mobile applications.
• Use in explosive atmospheric environment.
• No model number or serial number transmitted
with the warranty claim.
14 – Disposal
Danfoss recommends that compressors
and compressor oil should be recycled
by a suitable company at its site.
