LLZ-A-C Series Scroll Compressors
“
Specifications
- Model Number: LLZ – A/C
- Internal Protection: E
- Supply Voltage Range: F
- Locked Rotor Current: G
- Lubricant Type and Nominal Charge: H
- Approved Refrigerant: I
Product Usage Instructions
Installation and Servicing
Installation and servicing of the compressor should be carried
out by qualified personnel only. Follow the provided instructions
and adhere to sound refrigeration engineering practices for
installation, commissioning, maintenance, and service.
Usage Guidelines
The compressor must only be used for its designed purpose(s) and
within its scope of safety regulations. Ensure compliance with
EN378 or other applicable local safety requirements. The compressor
cannot be connected to a nitrogen gas pressure outside the range of
0.3 to 0.7 bar.
Handling Instructions
The compressor must be handled with caution, especially when in
a vertical position. Avoid any rough handling that may damage the
compressor.
Electrical Connections
Refer to the wiring diagram with pump-down cycle for proper
electrical connections. Use ring connect screw terminals in the C
terminal box type according to the provided instructions.
Frequently Asked Questions (FAQ)
Q: What refrigeration systems are the LLZ scroll compressors
suitable for?
A: The LLZ scroll compressors are suitable for refrigeration
systems using approved refrigerants as specified in the manual.
Q: Can the compressor be connected to any nitrogen gas
pressure?
A: No, the compressor must be connected within the specified
nitrogen gas pressure range of 0.3 to 0.7 bar.
Q: Who should handle the installation and servicing of the
compressor?
A: Only qualified personnel should handle the installation and
servicing of the compressor to ensure proper setup and
maintenance.
“`
Instructions
Danfoss scroll compressors LLZ – A/C
A B C
D E
A: Model number
B: Serial Number
F
C: Technical number D: Manufacturing year
G
E: Internal protection
H
F: Supply voltage range
I
G: Locked rotor current
Maximum operating current
H: Lubricant type and nominal charge
I: Approved Refrigerant
Condensing temperature (°C)
Condensing temperature (°F)
Condensing temperature (°F)
Operating limits
LLZ – R404A / R507 – Non Injection
Saturated discharge temperature (°C)
65
60
55
50
45
40
20K superheat
35
30
25
20
15
10
5 -45 -40 -35 -30 -25 -20 -15 -10 -5
Saturated suction temperature (°C)
LLZ – R448A/R449A – Non Injection
Saturated Discharge Temperature °C
70
60
50
40
SH10K
30
20
RGT 20°C
10
0
-45
-40
-35
-30
-25
-20
-15
-10
-5
Saturated Suction Temperature °C
R455A – LLZ with LI
Evaporating temperature (°F)
-67 -58 -49 -40 -31 -22 -13 -4 70
5 14 23
65
60
S.H. = 10K
55
50
45
RGT = 20°C
40
35
30
25
20
15
10
5
0
-55 -50 -45 -40 -35 -30 -25 -20 -15 -10
-5
Evaporating temperature (°C)
32 41
0
5
50 59 158 149 140 131 122 113 104 95 86 77 68 59 50 41 32
10 15
Condensing temperature (°F) Condensing temperature (°C)
LLZ – R448A/R449A with LI (Tdis limit 120°C)
Saturated Discharge Temperature °C
70
60
50
SH10K
40
RGT 20°C
30
20
10
0
-45
-40
-35
-30
-25
-20
-15
-10
-5
Saturated Suction Temperature °C
LLZ – R452A – Non Injection
Saturated Discharge Temperature °C
70
60
50
SH10K
40
RGT 20°C
30
20
10
0
-45
-40
-35
-30
-25
-20
-15
-10
-5
Saturated Suction Temperature °C
R455A – Non injection
Evaporating temperature (°F)
-67 -58 -49 -40 -31 -22 -13
-4
70
5 14 23
65
60
55
50
45 S.H. = 10K (18°F)
40
35
30
25 RGT = 20°C (68°F)
20
15
10
5
0
-55 -50 -45 -40 -35 -30 -25 -20 -15 -10
-5
Evaporating temperature (°C)
32 41
0
5
50 59 158 149 140 131 122 113 104 95 86 77 68 59 50 41 32
10 15
Condensing temperature (°F) Condensing temperature (°C)
Condensing temperature (°C)
Condensing temperature (°C)
R454C – LLZ with LI
Evaporating temperature (°F)
-67 -58 -49 -40 -31 -22 -13
-4
70
5 14 23
65
60
55
S.H. = 10K
50
45
RGT = 20°C
40
35
30
25
20
15
10
5
0
-55 -50 -45 -40 -35 -30 -25 -20 -15 -10
-5
Evaporating temperature (°C)
32 41
0
5
50 59 158 149 140 131 122 113 104 95 86 77 68 59 50 41 32
10 15
R454C – Non injection
Evaporating temperature (°F)
-67 -58 -49 -40 -31 -22 -13
-4
70
5 14 23
65
60
55
S.H. = 10K (18°F)
50
45
40
35 RGT = 20°C (68°F)
30
25
20
15
10
5
0
-55 -50 -45 -40 -35 -30 -25 -20 -15 -10
-5
Evaporating temperature (°C)
32 41
0
5
50 59 158 149 140 131 122 113 104 95 86 77 68 59 50 41 32
10 15
OE-000029
R454A – Non injection
Evaporating temperature (°F)
-67 -58 -49 -40 -31 -22 -13
-4
70
5 14 23
65
60
55
Max Tc is 55°C for LLZ034T2
50
45
40 35
S.H. = 10K (18°F)
30
25
20
15
RGT = 20°C (68°F)
10
5
0
-55 -50 -45 -40 -35 -30 -25 -20 -15 -10
-5
Evaporating temperature (°C)
32 41
0
5
50 59 158 149 140 131 122 113 104 95 86 77 68 59 50 41 32
10 15
Danfoss OE-000207
Condensing temperature (°F)
-67 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0
-55
R454A – LLZ withLI
Evaporating temperature (°F)
-58 -49 -40 -31 -22 -13
-4
5 14 23
Max Tc is 55°C for LLZ034T2 S.H. = 10K (18°F)
RGT = 20°C (68°F)
-50 -45 -40 -35 -30 -25 -20 -15 -10
-5
Evaporating temperature (°C)
32 41
0
5
50 59 158 149 140 131 122 113 104 95 86 77 68 59 50 41 32
10 15
Danfoss OE-000208
Installation and servicing of the compressor by qualified personnel only. Follow these instructions and sound refrigeration engineering practice relating to installation, commissioning, maintenance and service.
Condensing temperature (°F)
The compressor must only be used for its Under all circumstances, the The compressor is delivered under The compressor must be
designed purpose(s) and within its scope of EN378 (or other applicable local nitrogen gas pressure (between 0.3 and handled with caution in the
application (refer to «operating limits»).
safety regulation) requirements 0.7 bar) and hence cannot be connected vertical position (maximum
Consult Application guidelines available from must be fulfilled.
as is; refer to the «assembly» section for offset from the vertical : 15°)
cc.danfoss.com
further details.
© Danfoss | Climate Solutions | 2025.04
8510283P01AB – AN261343021873en-000501 | 1
Condensing temperature (°C)
Instructions
Three phase (Wiring diagram with pump-down cycle)
CONTROL CIRCUIT
F1
F1
KM KA
KA
KS LP
L1 L3 L2 Q1
KA KS
A1 A3
180 s A2
TH
PM
T1 HPs
KM
T2 T3
KS
M
DGT
KM
KA
LLSV
KS
Wiring diagram with pump-down cycle
Electrical connections
C T
S T R T
Ring connect screw terminals C terminal box type
push
push
push
1 Introduction
These instructions pertain to the LLZ scroll compressors used for refrigeration systems. They provide necessary information regarding safety and proper usage of this product.
2 Handling and storage
· Handle the compressor with care. Use the dedicated handles in the packaging. Use the compressor lifting lug and use appropriate and safe lifting equipment.
· Store and transport the compressor in an upright position.
· Store the compressor between -35°C and 70°C / -31°F and 158°F.
· Don’t expose the compressor and the packaging to rain or corrosive atmosphere.
3 Safety measures before assembly
Never use the compressor in a flammable atmosphere. · Mount the compressor on a horizontal flat
surface with less than 7° slope. · Verify that the power supply corresponds to
the compressor motor characteristics (see nameplate). · When installing a compressor for R452A, R404A/ R507, R448A/R449A, R454C, R455A, R454A, use equipment specifically reserved for HFC refrigerants which was never used for CFC or HCFC refrigerants. · Use clean and dehydrated refrigeration-grade copper tubes and silver alloy brazing material. · Use clean and dehydrated system components. · The piping connected to the compressor must be flexible in 3 dimensions to dampen vibrations. · The compressor must always be mounted with the rubber grommets supplied with the compressor. 4 Assembly
· Slowly release the nitrogen holding charge through discharge and suction ports.
· Connect the compressor to the system as soon as possible to avoid oil contamination from ambient moisture.
· Avoid material entering into the system while cutting tubes. Never drill holes where burrs cannot be removed.
· Do not exceed the maximum tightening torque
for rotolock connections
Rotolock connections 1″ Rotolock
1″ 1/4 Rotolock 1″ 3/4 Rotolock
Tightening torque 80 Nm±10Nm 90 Nm±10Nm 110 Nm±10Nm
· Connect the required safety and control devices. When the schrader port, if any, is used for this, remove the internal valve. 5 Leak detection
Never pressurize the circuit with oxygen or dry air. This could cause fire or explosion. · Do not use leak detection dye. · Perform a leak detection test on the complete
system. · The low side test pressure must not exceed 31
bar /450 psi. · When a leak is discovered, repair the leak and
repeat the leak detection.
6 Vacuum dehydration
· Never use the compressor to evacuate the system.
· Connect a vacuum pump to both the LP & HP sides.
· Pull down the system under a vacuum of 500 µm Hg (0.67 mbar) / 0.02 inch Hg absolute.
· Do not use a megohmmeter nor apply power to the compressor while it is under vacuum as this may cause internal damage.
7 Electrical connections
· Switch off and isolate the main power supply. · All electrical components must be selected as per
local standards and compressor requirements. · Refer to page 1 for electrical connections details.
For three phase applications, the terminals are labeled T1, T2, and T3. · Danfoss scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the compressor top). Three-phase motors, however, will start and run in either direction, depending on the phase angles of the supplied power. Care must be taken during installation to ensure that the compressor operates in the correct direction. · Use ø 4.8 mm / #10 – 32 screws and ¼” ring terminals for the power connection with ring connect screw terminal (C type). Fasten with 3 Nm torque.
· Use a self tapping screw to connect the compressor to earth.
8 Filling the system
· Keep the compressor switched off. · Keep the refrigerant charge below the indicated
charge limits if possible. Above this limit; protect the compressor against liquid flood-back with a pump-down cycle or suction line accumulator. · Never leave the filling cylinder connected to the circuit.
Compressor models Refrigerant charge limit
LLZ013-015-018
4.5 kg / 10 lb
LLZ024-034
7.2 kg / 16 lb
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 R404A/R507 1.3 bar (absolute) / 19 psia
Minimum setting for R452A
1.2 bar (absolute) / 17.6 psia
Minimum setting for R448A/R449A 1.0bar (absolute) / 14.5psia
Minimum setting forR454C
1.0bar (absolute)/14.5 psia
Minimum setting forR455A
1.0bar (absolute)/14.5 psia
Minimum setting forR454A
1.1bar (absolute)/16 psia
· 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
2 | AN261343021873en-000501 – 8510283P01AB
© Danfoss | Climate Solutions | 2025.04
Instructions
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.
© Danfoss | Climate Solutions | 2025.04
8510283P01AB – AN261343021873en-000501 | 3
4 | AN261343021873en-000501 – 8510283P01AB
© Danfoss | Climate Solutions | 2025.04
Documents / Resources
 |
Danfoss LLZ-A-C Series Scroll Compressors [pdf] Instructions LLZ - R404A - R507, LLZ - R448A-R449A, LLZ - R452A, LLZ-A-C Series Scroll Compressors, LLZ-A-C Series, Scroll Compressors, Compressors |