Danfoss SM series Instruktion Seite 6

Instructions
• T he thermostat connection (if present) is a ¼"
AMP-AWE spade connector.
• T he compressor must be connected to earth
with the 5 mm earth terminal screw.
8 – Filling the system
• K eep the compressor switched off.
• F ill the refrigerant in liquid phase into the
condenser or liquid receiver. The charge must
be as close as possible to the nominal system
charge to avoid low pressure operation and ex-
cessive superheat. Never let the pressure on LP
side exceed the pressure on HP side with more
than 5 bar. Such pressure difference could
cause internal compressor damage.
• K eep the refrigerant charge below the indica-
ted charge limits if possible. Above this limit;
protect the compressor against liquid flood-
back with a pump-down cycle or suction line
accumulator.
• N ever leave the filling cylinder connected to
the circuit.
Compressor models
SM/SZ 084, 090, 100
SM/SZ 110, 120
SM 112, 124, 147
SM/SZ 115, 125
SM/SZ 148, 160, 161
SM/SZ 175, 185
SY/SZ 240
SY/SZ 380
SH 090
SH 105, 120, 140, 161, 184
SH 180, 240, 300
SH 380
9 – Verification before commissioning
Use safety devices such as safety pressure
switch and mechanical relief valve in com-
pliance with both generally and locally appli-
cable regulations and safety standards. Ensure
that they are operational and properly set.
Check that the settings of high-pressure
switches and relief valves don't exceed the
maximum service pressure of any system com-
ponent.
• A low-pressure switch is recommended to
avoid vacuum operation. Minimum setting
for SM/SY/SZ: 1.5 bar (absolute). Minimum
setting for SH: 1.6 bar (absolute).
• V erify that all electrical connections are pro-
perly fastened and in compliance with local
regulations.
• W hen a crankcase heater is required, it
must be energized at least 12 hours before
initial start-up and start-up after prolonged
shutdown for belt type crankcase heaters (6
hours for surface sump heaters).
10 – Start-up
• N ever start the compressor when no refrige-
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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.003.A2.02 - July 2010
rant is charged.
• A ll service valves must be in the open position.
• B alance the HP/LP pressure.
• E nergize the compressor. It must start prompt-
ly. If the compressor does not start, check wi-
ring conformity and voltage on terminals.
• E ventual reverse rotation can be detected
by following phenomena; the compressor
doesn't build up pressure, it has abnormally
high sound level and abnormally low power
consumption. In such case, shut down the
compressor immediately and connect the
phases to their proper terminals. Most Per-
former® scroll compressors are protected
against reverse rotation either by an internal
reverse rotation protection or by the external
electronic protection module. They will shut
off automatically. Only SH 090 to 184 and SM
112, 124, 147 have no reverse rotation protec-
tion. Prolonged reverse rotation will damage
these compressors.
• I f the internal overload protector trips out (SM/
SZ 084, 090, 100, 110, 112, 120, 124, 147, 148,
Refrigerant charge
limit (kg)
161 and SH 090, 105, 120, 140, 161, 184), it must
8.5
cool down to 60°C to reset. Depending on am-
10
bient temperature, this may take up to several
7.9
11
hours.
12.5
• I f the internal pressure relief valve is opened
13.5
(SY/SZ 240, 300, 380 and SH 380), the com-
16
pressor sump will be warm and the compres-
20
5.9
sor will trip out on the motor protector.
7.9
13.5
11 – Check with running compressor
14.5
• C heck current draw and voltage.
• C heck suction superheat to reduce risk of
slugging.
• O bserve the oil level in the sight glass for
about 60 minutes to ensure proper oil return
to the compressor.
• R espect the operating limits.
• C heck all tubes for abnormal vibration. Move-
ments in excess of 1.5 mm require corrective
measures such as tube brackets.
• W hen needed, additional refrigerant in liquid
phase may be added in the low-pressure side as
far as possible from the compressor. The com-
pressor must be operating during this process.
• D o not overcharge the system.
• N ever release refrigerant to atmosphere.
• B efore leaving the installation site, carry out
a general installation inspection regarding
cleanliness, noise and leak detection.
• R ecord 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 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.
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:
• 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
and compressor oil should be recycled
by a suitable company at its site.
Copyright Danfoss Commercial Compressors - DSS - 07/10