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Inverter scroll compressor VRJ
Application guide
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Danfoss Inverter scroll compressor VRJ Application guide

Application Guidelines
Danfoss Inverter scroll compressor, VRJ
For Residential Applications - R410A
http://danfoss.us.com/
Application Guidelines
Content
Introduction ................................................... 4
Compressor model designation ................... 5
Technical specications ................................ 6
Performance data ..............................................................6
Bearings lubrication .......................................................... 6
Dimensions .................................................... 7
Electrical data, connections and wiring ....... 8
LRA (Locked Rotor Amp)..................................................8
Winding resistance ............................................................8
Wiring connections .......................................................... 9
Approvals and certicates ........................... 10
Approval and certicates ...............................................10
Pressure equipment directive 97/23/EC ..................10
Low voltage directive 73/23/EC, 93/68/EC...............10
Internal free volume .........................................................10
Operating conditions ................................... 11
Refrigerant and lubricants .............................................11
Motor supply.......................................................................11
Compressor ambient temperature .............................11
Application envelope ......................................................12
High and low pressure protection ..............................13
Crankcase heating ............................................................13
Oil return management ..................................................13
On/o cycling (cycle rate limit) ....................................14
Start-up sequence .............................................................14
System design recommendations .............. 15
General ..................................................................................15
Essential piping design considerations .....................15
Refrigerant charge limit .................................................16
Reversible heat pump systems ....................................16
Minimum sump superheat ............................................16
Preventing liquid ood back ........................................16
Water utilising systems ..................................................17
Loss of charge protection...............................................17
Oil level checking and top-up ......................................17
Sound and vibration management ............. 18
Starting sound level .........................................................18
Running sound level ........................................................18
Stopping sound level .......................................................18
Sound generation in a refrigeration system and air
conditioning system ........................................................18
Installation .................................................... 20
System cleanliness ............................................................20
Compressor handling and storage .............................20
Compressor mounting ....................................................20
Compressor holding charge ..........................................20
Tube brazing procedure .................................................20
Brazing material .................................................................20
Compressor connection .................................................21
Vacuum evacuation and moisture removal .............21
Liquid line lter driers ......................................................22
Refrigerant charging ........................................................22
Insulation resistance and dielectric strength ..........22
Compressor replacement after motor burn out ....22
Ordering information and packaging ........ 23
Packaging ............................................................................23
Ordering code numbers .................................................23
3AB141686422149en-US0301
Application Guidelines

Introduction

Scroll compressor components

Danfoss VRJ for residential applications developed by Danfoss is a complete package consisting of a dedicated variable speed compressor, variable speed drive, application controller, electronic expansion valve (EEV), EEV controller and sensors. Three nominal system
The motor stator is rigidly attached to the shell. The rotor is shrink-t onto the eccentric shaft. The shaft is supported by two bearings, one in the crankcase and the second below the motor.
sizes are available (3, 4 and 5 TR), based on three compressor models.
These Selection & Application Guidelines focus on the variable speed scroll compressor.

Compressor size

Performance

Variable speed technology oers more exibility in compressor selection than xed speed compressors. Selection of the right variable speed compressor size can be done by dierent methods:
• Maximum cooling capacity: select a compressor size that achieves the peak load system cooling capacity demand at its maximum speed.
• Nominal cooling capacity: select a compressor size that achieves the nominal system cooling capacity at a rotational speed of 3000-4200 rpm (50-70Hz).
• Best Seasonal Eciency Ratio: select a compressor size that achieves the minimum
The Danfoss VRJ compressors referenced in this guide is a fully compliant scroll and actually improves with run time in its early commissioning.
system cooling demand at its minimum speed. Ensure that the compressor is able to cover the peak load system cooling capacity. This selection makes the compressor to run for a maximum of time at part load where the system eciency is highest.
Danfoss scroll compressors are manufactured using the most advanced machining, assembly, and process control techniques. In design of both the compressor and the factory, very high standards of reliability and process control were rst priority. The result is a highly ecient product with the highest reliability obtainable, and a low sound level.
A seventy-two hour run-in is recommended to meet performance expectations.
4 AB141686422149en-US0301
Application Guidelines

Compressor model designation

Nomenclature

Label

Application,
Family
& Refrigerant
VRJ
Application, Family & refrigerant V: Variable speed R: Residential J: R410A, PVE lubricant
Swept Volume
Displacement in cc/rev
Model Variation U: Design optimised for high SEER
Compressor Model no : VRJ044UKNP6
Serial no :
Tech no : VGK46PHA001
LK2500000333
Swept
Volume
028
Model
Variation
U
245 Max Inverter Driven Drive Model: 178L002
LR: 12.0 A MAX OPER: 30.0A Lubricant:PVE / 45 oz/1.33 L
VoltageNMotor
K
MADE IN CHINA
Protection
Equipment
Version
P
Other
Features
6
Other features 6: No other features
Equipment version P: Brased connections,
spade terminals
Motor protection N: No internal motor
protection (protection by drive)
Voltage K: 420V DCL IPM

Serial number

2020
INVERTER PROTECTED
PROTECTED BY DOMESTIC AND FOREIGN PATENTS
1000000052
12345678A 25B
Year code 8 Digit serial number
Month code
Plant assembly line code
5AB141686422149en-US0301
Application Guidelines

Technical specifications

Compressor specications

Performance data

Compressor
model
VRJ028 1.64 51 103 206 240 36 68
VRJ035 2.12 66 133 265 310 45 71
VRJ044 2.65 83 166 332 387 45 71
Conditions
High SEER
conditions
(H)
CHEER
conditions
Heat Pump conditions
SEER
conditions (I)
Swept
volume
cu.in/rev
Compressor model
VRJ028 3 Tons
VRJ035 4 Tons
VRJ044 5 Tons
VRJ028 3 Tons
VRJ035 4 Tons
VRJ044 5 Tons
VRJ028 3 Tons
VRJ035 4 Tons
VRJ044 5 Tons
VRJ028 3 Tons 1800 30 21000 1.75 68.5
VRJ035 4 Tons 1800 30 26800 2.23 69.7
VRJ044 5 Tons 1800 30 34500 2.88 70.9
Min speed 30 Hz 60 Hz Max speed
900 rpm 1800 rpm 3600 rpm 4200 rpm
Nominal Tons
Displacement Oil charge Net weight
oz lb
Compressor speed Compressor capacity
rpm Hz Btu/hr Ton
3600 60 36700 3.06 66.2
4200 70 42700 3.56 64.9
3600 60 46400 3.87 67.6
4200 70 53400 4.45 65.1
3600 60 57800 4.82 68.3
4200 70 68100 5.68 67.0
3600 60 36500 3.04 65.9
4200 70 42300 3.53 64.3
3600 60 46200 3.85 67.3
4200 70 53000 4.42 64.6
3600 60 57900 4.83 68.8
4200 70 68300 5.69 67.5
3600 60 25100 2.09 59.7
4200 70 29300 2.44 58.8
3600 60 31800 2.65 61.0
4200 70 36700 3.06 59.0
3600 60 40200 3.35 62.2
4200 70 47300 3.94 61.2
Compressor
isentropic eciency
Variable speed drive specications

Bearings lubrication

6 AB141686422149en-US0301
Conditions
High SEER
conditions (H)
CHEER
conditions
Heat Pump
conditions
SEER
conditions (I)
Evaporating
Temperature
(°F)
50 115 20 15
45 100 20 15
30 110 20 15
55 100 20 15
Condensing
Temperature
(°F)
For dedicated variable speed drive specications, refer to “Danfoss VRJ Installation and Operation instructions”.
A specic oil pump ensures optimal bearing lubrication at all compressor speeds. This to have sucient bearing lubrication at low speeds as well
Superheat
(°F)
Subcooling
(°F)
as avoid excessive Oil Circulation Ratio (OCR) at high speeds.
Application Guidelines
9.40
All dimensions in inch

Dimensions

VRJ 028 - 035 - 044

4.38
5.06
2.74 - 2.80
7.491 - 7.509
3.750
34°
6.438 - 6.515
31°
45°
4.32
14°
4 x Ø 0.75 - 0.78
3.750
9.40
7.491 - 7.509
14.19
Discharge port 1/2” ODF
2.84 - 2.95
7.76
Suction port 3/4” ODF
9.09
0.42
0.75

Mounting grommet

0.067
1.161
1.614
15.53
5/16” - 18 UNC self tapping
Ø 0.433
Recommended torque for mounting bolts: 8 ft.lbs (±1ft.lbs)
Ø 1.614
7AB141686422149en-US0301
Application Guidelines

Electrical data, connections and wiring

Supply Voltage VRJ compressors must not be connected directly

to the mains supply. They must only be powered through the dedicated Danfoss variable speed drive.
Compressor model Variable Speed Drive Model
VRJ028 176L7000
VRJ035 176L7001
VRJ044 176L7002
Compressor electrical specications

LRA (Locked Rotor Amp)

MCC (Maximum Continuous Current)

Winding resistance

Nominal voltage 208-230V – 1Ph – 60Hz Voltage range 187 – 253 V
Refer to “Danfoss VRJ Installation and Operation instructions” for more details about supply voltage.
Compressor model LRA MCC Winding resistance
A A Ohm
VRJ028 10.2 18 0.255
VRJ035 12 23.5 0.210
VRJ044 12 30 0.210
LRA is the higher average current as measured on a mechanically blocked compressor tested under nominal voltage. LRA is printed on the
VRJ compressors, the LRA value is low because the variable speed drive reacts very rapidly (far below 1 second).
nameplate, according to UL requirements. With
The MCC value is the maximum at which the compressor can be operated in transient
MCC value is measured based on UL conditions (max load) and at low voltage.
conditions and out of the operating envelope. The
VRJ scroll compressors are equipped with an IPM (permanent magnet) motor.
temperature ; If the compressor is stabilised at a dierent value than 77°F, the measured resistance must be corrected with following formula:
a + t
Winding resistance is the resistance between indicated terminal pins at 77°F (resistance value ± 7%).
Winding resistance is generally low and it requires adapted tools for precise measurement. Use a digital ohm-meter, a ‘4 wires’ method and measure under stabilised ambient temperature.
R
= R
tamb
77°F
t
: reference temperature = 77°F
77°F
: temperature during measurement (°F)
t
amb
: winding resistance at 77°F
R
77°F
: winding resistance at t
R
tamb
a: Coecient a= 390
a + t
amb
77°F
amb
Winding resistance varies strongly with winding
8 AB141686422149en-US0301
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