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
Scroll compressor components.....................................	4
Compressor size..................................................................	4
Performance.........................................................................	4
Compressor model designation....................	5
Nomenclature......................................................................	5
Label........................................................................................	5
Serial number.......................................................................	5
Technical specifications ................................	6
Compressor specifications..............................................	6
Performance data ..............................................................	6
Variable speed drive specifications..............................	6
Bearings lubrication...........................................................	6
Dimensions ....................................................	7
VRJ 028 - 035 - 044..............................................................	7
Mounting grommet...........................................................	7
Electrical data, connections and wiring.......	8
Supply Voltage ....................................................................	8
Compressor electrical specifications...........................	8
LRA (Locked Rotor Amp)..................................................	8
MCC (Maximum Continuous Current).........................	8
Winding resistance.............................................................	8
Wiring connections ...........................................................	9
Terminal cover mounting................................................	9
Terminal cover removal....................................................	9
IP rating..................................................................................	9
Internal motor protection................................................	9
Phase sequence and reverse rotation protection...	9
Approvals and certificates............................	10
Approval and certificates................................................	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/off 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 flood 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 filter 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

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Application Guidelines	Introduction

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

sizes are available (3, 4 and 5 TR), based on three compressor models.

These Selection & Application Guidelines focus on the variable speed scroll compressor.

Scroll compressor	The motor stator is rigidly attached to the shell.
components	The rotor is shrink-fit onto the eccentric shaft. The
	shaft is supported by two bearings, one in the
	crankcase and the second below the motor.

Compressor size	Variable speed technology offers more flexibility
	in compressor selection than fixed speed
	compressors. Selection of the right variable
	speed compressor size can be done by different
	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).

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 efficiency 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 first priority. The result is a highly efficient product with the highest reliability obtainable, and a low sound level.

•Best Seasonal Efficiency Ratio: select a compressor size that achieves the minimum

Performance	The Danfoss VRJ compressors referenced in this
	guide is a fully compliant scroll and actually
	improves with run time in its early commissioning.

A seventy-two hour run-in is recommended to meet performance expectations.

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Application Guidelines

Compressor model designation

Nomenclature

Application,

Swept

Model

Voltage

Motor

Equipment

Other

Family

Volume

Variation

Protection

Version

Features

& Refrigerant

VRJ

028

U

K

N

P

6

Application, Family

Other features

& refrigerant

6: No other features

V: Variable speed

Equipment version

R: Residential

P: Brased connections,

J: R410A, PVE lubricant

spade terminals

Motor protection

Swept Volume

N: No internal motor

protection (protection by

Displacement in cc/rev

drive)

Model Variation

Voltage

U: Design optimised for high SEER

K: 420V DCL IPM

Label

Compressor

Model no : VRJ044UKNP6

Serial no : LK2500000333

Tech no : VGK46PHA001

M A D E I N C H I N A

245 Max Inverter Driven

Drive Model: 178L002

LR: 12.0 A MAX OPER: 30.0A Lubricant:PVE / 45 oz/1.33 L

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INVERTER PROTECTED

PROTECTED BY DOMESTIC AND FOREIGN PATENTS

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Serial number

			A B 25						12345678
Year code									8 Digit serial number
Month code
Plant assembly line code

AB141686422149en-US0301 5

Application Guidelines	Technical specifications
Compressor specifications	Compressor	Swept			Displacement					Oil charge	Net weight
		volume
	model	cu.in/rev	Min speed		30 Hz	60 Hz		Max speed		oz	lb
			900 rpm		1800 rpm	3600 rpm			4200 rpm
	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
Performance data					Compressor speed		Compressor capacity
	Conditions	Compressor		Nominal						Compressor
		model		Tons	rpm	Hz		Btu/hr	Ton	isentropic efficiency
		VRJ028		3 Tons	3600	60		36700	3.06		66.2
					4200	70		42700	3.56		64.9
	High SEER
					3600	60		46400	3.87		67.6
	conditions	VRJ035		4 Tons
					4200	70		53400	4.45		65.1
	(H)
					3600	60		57800	4.82		68.3
		VRJ044		5 Tons
					4200	70		68100	5.68		67.0
		VRJ028		3 Tons	3600	60		36500	3.04		65.9
					4200	70		42300	3.53		64.3
	CHEER	VRJ035		4 Tons	3600	60		46200	3.85		67.3
	conditions				4200	70		53000	4.42		64.6
		VRJ044		5 Tons	3600	60		57900	4.83		68.8
					4200	70		68300	5.69		67.5
		VRJ028		3 Tons	3600	60		25100	2.09		59.7
					4200	70		29300	2.44		58.8
	Heat Pump	VRJ035		4 Tons	3600	60		31800	2.65		61.0
	conditions				4200	70		36700	3.06		59.0
		VRJ044		5 Tons	3600	60		40200	3.35		62.2
					4200	70		47300	3.94		61.2
	SEER	VRJ028		3 Tons	1800	30		21000	1.75		68.5
		VRJ035		4 Tons	1800	30		26800	2.23		69.7
	conditions (I)
		VRJ044		5 Tons	1800	30		34500	2.88		70.9
		Evaporating			Condensing	Superheat		Subcooling
	Conditions	Temperature			Temperature
						(°F)			(°F)
			(°F)		(°F)
	High SEER		50		115	20			15
	conditions (H)
	CHEER		45		100	20			15
	conditions
	Heat Pump		30		110	20			15
	conditions
	SEER		55		100	20			15
	conditions (I)
Variable speed drive	For dedicated variable speed drive specifications,
specifications	refer to “Danfoss VRJ Installation and Operation
	instructions”.

Bearings lubrication	A specific oil pump ensures optimal bearing
	lubrication at all compressor speeds. This to have
	sufficient bearing lubrication at low speeds as well

as avoid excessive Oil Circulation Ratio (OCR) at high speeds.

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Application Guidelines Dimensions

	VRJ 028 - 035 - 044	9.40
		7.491 - 7.509

3.750	4 x Ø 0.75 - 0.78

5.06	3.750
	4.32

9.40

7.491 - 7.509

4.38

14°

2.74 - 2.80	34°	31°

45°

6.438 - 6.515

Discharge port 1/2” ODF

2.84- 2.95

14.19

7.76

All dimensions in inch

Suction port 3/4” ODF

15.53

9.09

0.42

0.75

Mounting grommet

0.067

1.161

1.614

5/16” - 18 UNC

self tapping

Ø 0.433

Ø 1.614

Recommended torque for mounting bolts: 8 ft.lbs (±1ft.lbs)

AB141686422149en-US0301 7

Rtamb= R77°F

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

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 electrical	Compressor model	LRA	MCC	Winding resistance
	specifications
			A	A	Ohm
		VRJ028	10.2	18	0.255
		VRJ035	12	23.5	0.210
		VRJ044	12	30	0.210

LRA (Locked Rotor Amp)	LRA is the higher average current as measured
	on a mechanically blocked compressor tested
	under nominal voltage. LRA is printed on the
	nameplate, according to UL requirements. With

VRJ compressors, the LRA value is low because the variable speed drive reacts very rapidly (far below 1 second).

MCC (Maximum Continuous	The MCC value is the maximum at which	MCC value is measured based on UL conditions
Current)	the compressor can be operated in transient	(max load) and at low voltage.
	conditions and out of the operating envelope. The

Winding resistance	VRJ scroll compressors are equipped with an IPM
	(permanent magnet) motor.
	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.
	Winding resistance varies strongly with winding

temperature ; If the compressor is stabilised at a different value than 77°F, the measured resistance

must be corrected with following formula: a + t amb

a + t77°F

t77°F: reference temperature = 77°F

t amb : temperature during measurement (°F) R77°F : winding resistance at 77°F

Rtamb : winding resistance at tamb a: Coefficient a= 390

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