Danfoss scroll compressors
DSH 090-184
50 Hz - 60 Hz - R410A
Application guidelines
http://cc.danfoss.com
PRELIMINARY
Content
GENERAL INFORMATION ........................ 4
PRODUCT INFORMATION ....................... 5
Features..................................................... 5
Overview ......................................................................5
How do IDVs work? ................................................... 5
Compressor model designation ............. 6
Nomenclature ............................................................6
Technical specications ........................... 7
50-60 Hz data .............................................................7
Dimensions ............................................... 8
Single compressors ..................................................8
Electrical data, connections and wiring . 9
Motor voltage .............................................................9
Wiring connections ..................................................9
IP rating .......................................................................10
Three phase electrical characteristics .............10
Motor protection.....................................................11
Approval and certicates ...................... 12
Low voltage directive ............................................12
Machines directive .................................................12
Pressure Equipment ...............................................12
Internal free volume...............................................12
SYSTEM DESIGN ..................................... 13
Design piping ......................................... 13
General requirements ...........................................13
Design compressor mounting .............. 14
General requirements ...........................................14
Single requirements...............................................14
Manage oil in the circuit ........................ 15
Requirement .............................................................15
Evaluate the risk .......................................................15
Test, criteria and solutions ...................................15
Manage sound and vibration ................ 16
Compressor sound radiation ..............................16
Mechanical vibrations ...........................................17
Gas pulsation ............................................................17
Manage operating envelope ................. 18
Requirement .............................................................18
Evaluate the risk .......................................................19
Test, criteria and solutions ...................................19
Manage superheat ................................. 20
Requirement ............................................................ 20
Evaluate the risk ...................................................... 20
Test, criteria and solutions ...................................21
Manage o cycle migration ................... 22
Requirement ............................................................ 22
Evaluate the risk ...................................................... 22
Test, criteria and solutions .................................. 22
Provide power supply and electrical
protection ............................................... 23
Wiring information ................................................ 23
Soft starts .................................................................. 24
Control logic ........................................... 25
Safety control logic requirements ................... 25
Cycle rate limit requirements ............................ 25
Defrost logic recommendations ...................... 25
Pump-down logic recommendations ............ 26
Reduce moisture in the system ............. 27
Requirements .......................................................... 27
Solutions ................................................................... 27
INTEGRATION INTO SYSTEMS .............. 28
Assembly line procedure ....................... 28
Compressor storage .............................................. 28
Compressor holding charge .............................. 28
Handling ................................................................... 28
Piping assembly...................................................... 29
System pressure test and leak detection ...... 29
Vacuum evacuation and moisture removal 30
Refrigerant charging ............................................. 30
Dielectric strength and insulation resistance
tests ............................................................................. 30
Commissioning ....................................... 31
Preliminary check....................................................31
Initial start-up ...........................................................31
System monitoring .................................................31
ORDERING INFORMATION ................... 32
Packaging ............................................... 32
Ordering codes ....................................... 33
Accessories .............................................. 34
3FRCC.PC.037.A1.02 - part 2
PRELIMINARY
PRODUCT INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION GENERAL INFORMATION
General Information
Danfoss scroll compressors are designed and
manufactured according to the state of the
art and to valid European and US regulations.
Particular emphasis has been placed on
safety and reliability. Related instructions are
highlighted with the following icons:
This icon indicates instructions to avoid
safety risk.
This icon indicates instructions to avoid
reliability risk.
The purpose of this guideline is to help
customers qualify compressors in the unit.
You are strongly advise to follow these
instructions. For any deviation from the
guidelines, please contact Danfoss Technical
Support. In any case, Danfoss accepts no
liability as a result of the improper integration
of the compressor into the unit by the system
manufacturer.
R
4 FRCC.PC.037.A1.02 - part 2
PRELIMINARY
GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION
DSH 090-105-120-140-161-184 scroll compressor
benet from an improved design to achieve the
highest eciency and increased life time.
Features
Danfoss Intermediate Discharge Valves (IDVs)
are located close to the discharge side of the
compressor. They reduce excessive compression
of refrigerant under part-load conditions while
maintaining the same cooling capacity. The IDVs
open when discharge pressure falls below the
built-in optimization point. They adapt the eort
of the motor to the varying load and pressure
conditions in the system, thus reducing the eort
of the motor and its electrical consumption
and improving the system’s seasonal energy
eciency.
How do IDVs work?
Intermediate discharge valves (IDVs)
increase seasonal eciency
Heat shield lowers the heat transfer
between discharge and suction gas
and the acoustic level
New PTFE spring seal for even lower
leaks
R410A optimized and dedicated
scroll prole
Lead free polymer bearings improve
behavior under poor lubrication
conditions
Patented motor cap
Improved lower bearing centring
Patented motor centring spacer
Overview
5FRCC.PC.037.A1.02 - part 2
PRELIMINARY
GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION
Compressor model designation
Danfoss scroll compressor DSH for R410A is
available as single compressor and can be
assembled in tandem or trio combinations.
The example below presents the compressor
nomenclature which equals the technical
reference as shown on the compressor
nameplate. Code numbers for ordering are listed
in section “Ordering information”.
Nomenclature
Family, lubricant
& refrigerant
DSH: Scroll, POE lubricant,
for R410A 60 Hz
Motor protection
A: Electronic module, 24V AC
B: Electronic module, 110-240V
L: Internal overload protector
Suction and discharge connections
A: Brazed connections
Family,
lubricant
& refrigerant
Nominal
capacity
Approvals Voltage Version Evolution
index
Evolution index
A~Z
A4DSH AAB184
Motor voltage code
3: 200-230V/3~/60 Hz
4: 380-415V/3~/50 Hz - 460V/3~/60 Hz
7: 500V/3~/50 Hz - 575V/3~/60 Hz
9: 380V/3~/60 Hz
UL index
Nominal capacity
in thousand Btu/h at 60 Hz, R410A,
ARI conditions
6 FRCC.PC.037.A1.02 - part 2
PRELIMINARY
GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION
Technical specications
50-60 Hz data
Model
Nominal
tons 60 Hz
Nominal cooling
capacity
Power
input
COP E.E.R.
Swept
volume
Displace-
ment
Oil charge
Net weight
TR W Btu/h kW W/W Btu/h/W cm
3
/rev m
3
/h dm
3
kg
50 Hz
DSH090 7.5 22500 76770 7.22 3.12 10.64 88.40 15.4 3.0 58.0
DSH105 9 26500 90420 8.40 3.15 10.75 103.50 18.0 3.3 64.0
DSH120 10 30100 102710 9.44 3.18 10.86 116.90 20.3 3.3 64.0
DSH140 12 34100 116350 10.56 3.23 11.02 133.00 23.1 3.3 67.0
DSH161 13 39000 133100 12.15 3.21 10.95 151.70 26.4 3.3 69.0
DSH184 15 44000 150140 13.68 3.21 10.97 170.30 29.6 3.6 71.5
60 Hz
DSH090 7.5 27500 93830 8.56 3.21 10.96 88.40 18.6 3.0 58.0
DSH105 9 32300 110140 10.02 3.22 11.00 103.50 21.8 3.3 64.0
DSH120 10 36700 125230 11.25 3.26 11.11 116.9 0 24.6 3.3 64.0
DSH140 12 41700 142290 12.65 3.29 11.24 133.00 27.9 3.3 67.0
DSH161 13 47400 161740 14.57 3.26 11.11 151.70 31.9 3.3 69.0
DSH184 15 53400 182210 16.45 3.24 11.07 170.30 35.8 3.6 71.5
Displacement at nominal speed: 2900 rpm at 50 Hz, 3500 rpm at 60 Hz
Net weight with oil charge
TR: Ton of Refrigeration, Standard rating conditions: ARI standard Evaporating temperature: 7.2 °C Superheat: 11.1 K
EER: Energy Eciency Ratio Refrigerant: R410A Condensing temperature: 54.4 °C Subcooling: 8.3 K
COP: Coecient Of Performance,
Subject to modication without prior notication.
Data given for motor code 4 compressor, for full data details and capacity tables refer to Coolselector®2
www.coolselector.danfoss.com
7FRCC.PC.037.A1.02 - part 2
PRELIMINARY
GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION
Dimensions
Compressor model D (mm) H (mm) H1(mm) H2(mm) L1(mm) L2(mm) L3(mm) Outline drawing number
DSH090 224 470 220 436 180 230 230 8560004
DSH105-120-140-161 224 527 262 494
180*
200**
230 230 8560003
DSH184 234 543 284 509 200 230 230 8560023
* compressor motor codes 4, 7, 9
** compressor motor code 3
Single compressors
Ø D
H1
4 x holes
Ø19.05
L3
L2
190.5
190.5
L1
30°
30°
H2
H3
Ø D
H1
4 x holes
Ø19.05
L3
L2
190.5
190.5
L1
30°
30°
H2
H3
8 FRCC.PC.037.A1.02 - part 2
PRELIMINARY
GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION
Electrical data, connections and wiring
Danfoss scroll compressors DSH are available in four dierent motor voltages as listed below.
Electrical power is connected to the compressor
terminals by Ø 4.8 mm (3/16") screws.
The maximum tightening torque is 3 Nm. Use a
1/4" ring terminal on the power leads.
Motor voltage
Wiring connections
DSH090-105-120-140-161
*except DSH140-161 code3
DSH140-161 code3 &
DSH184
The terminal box is provided with a Ø 25.5 mm
(ISO25) and a Ø 29 mm (PG21) knockouts.
The terminal box is provided with a Ø 40.5 mm
hold (ISO40) for power supply and a Ø 16.5 mm
knockout (ISO16).
Motor voltage code Code 3 Code 4 Code 7 Code 9
50 Hz
Nominal voltage - 380-415 V - 3 ph - -
Voltage range - 342-457 V - -
60 Hz
Nominal voltage 200-230 V - 3 ph 460V - 3 ph 575 V - 3 ph 380-400 V - 3 ph
Voltage range 180-253 V 414-506 V 517-632 V 340-440 V
Vavg = Mean voltage of phases 1, 2, 3.
V1-2 = Voltage between phases 1 and 2.
V1-3 = Voltage between phases 1 and 3.
V2-3 = Voltage between phases 2 and 3.
| Vavg - V1-2 | + | Vavg - V1-3 | + | Vavg - V2-3 |
2 x Vavg
% voltage
imbalance
= x 100
The maximum allowable voltage imbalance is
2%. Voltage imbalance causes high amperage
over one or several phases, which in turn leads to
overheating and possible motor damage. Voltage
imbalance is given by the formula:
Terminal box
Ø 25.5 mm knockout
Power supply
Ø 29 mm knockout
Ø 40.5 mm hole
Ø 16.5 mm
knockout
Power supply
9FRCC.PC.037.A1.02 - part 2
PRELIMINARY
GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION
Electrical data, connections and wiring
IP rating
The compressor terminal box according to IEC529 is IP54 for all models when correctly sized IP54 rated
cable glands are used.
First numeral, level of protection against contact and foreign objects
5 - Dust protected
Second numeral, level of protection against water
4 - Protection against water splashing
Three phase electrical
characteristics
Compressor model
LRA MCC Max. operating current Winding resistance
A A A Ω
Motor voltage code 3
200-230 V / 3ph / 60 Hz
DSH090 203 43 38 0.39
DSH105 267 46 45 0.27
DSH120 267 61 48 0.27
DSH140 304 64 56 0.24
DSH161 315 69 64 0.22
DSH184 351 75 71 0.22
Motor voltage code 4
380-415 V / 3ph / 50 Hz
460 V / 3ph / 60Hz
DSH090 98 22 19 1.47
DSH105 142 25 22 1.05
DSH120 142 29 24 1.05
DSH140 147 30 28 0.92
DSH161 158 35 31 0.83
DSH184 197 38.6 36 0.83
Motor voltage code 7
575 V / 3 ph / 60 Hz
DSH090 84 18 14 2.34
DSH105 103 22 17 1.57
DSH120 103 24 19 1.57
DSH140 122 26 22 1.38
DSH161 136 29 24 1.32
DSH184 135 35 28 1.32
Motor voltage code 9
380-400 V / 3ph / 60 Hz
DSH090 124 26 23 1.05
DSH105 160 32 26 0.72
DSH120 160 35 29 0.72
DSH140 168 37 33 0.62
DSH161 177 41 37 0.57
DSH184 239 51 41 0.57
The MCC is the current at which the motor
protection trips under maximum load and
low voltage conditions. This MCC value is the
maximum at which the compressor can be
operated in transient conditions and out of
the application envelope. Above this value, the
internal motor protection or external electronic
module will cut-out the compressor to protect
the motor.
Locked Rotor Amp value is the higher average
current as measured on mechanically blocked
compressors tested under nominal voltage. The
LRA value can be used as a rough estimation for
the starting current. However, in most cases, the
real starting current will be lower. A soft starter
can be applied to reduce starting current (see
section
“soft start“).
MCC (Maximum Continuous
Current)
LRA (Locked Rotor Amp)
10 FRCC.PC.037.A1.02 - part 2
PRELIMINARY
GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION
Motor protection
Compressor models DSH 090 to 184 are
provided with internal overload motor
protection to prevent against excessive current
and temperature caused by overloading, low
refrigerant ow or phase loss. The cutout current
is the MCC value listed in table “Three phase
electrical characteristics”.
The protector is located in star point of motor
and, should it be activated, will cut out all three
phases. It will be reset automatically.
While not compulsory, an additional external
overload is still advisable for either alarm or
manual reset.
Then it must be set below MCC value (at max
operating current):
• When the motor temperature is too high, then
the internal protector will trip.
• When the current is too high the external
overload protection will trip before the internal
protection therefore oering possibility of
manual reset.
Electrical data, connections and wiring
Winding resistance is the resistance between
phases at 25°C (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 dierent value than 25°C, the measured
resistance must be corrected using the following
formula:
a + t
amb
R
tamb
= R
25°C
_______
a + t
25°C
t
25°C
: reference temperature = 25°C
t
amb
: temperature during measurement (°C)
R
25°C
: winding resistance at 25°C
R
amb
: winding resistance at tamb
Coecient a = 234.5
The max. operating current is the current when
the compressors operate at maximum load
conditions and 10% below nominal voltage (max.
evaporating temperature and max. condensing
temperature). Max Oper. A can be used to select
cables and contactors. In normal operation, the
compressor current consumption is always less
than the Max Oper. A. value.
Winding resistance
Max. operating Current
Phase sequence and reverse
rotation protection
Use a phase meter to establish the phase
orders and connect line phases L1, L2 and L3 to
terminals T1, T2 and T3, respectively.
Compressor models DSH 090 to 184 incorporates
an internal reverse vent valve which will react
when the compressor is run in reverse and
will allow refrigerant to circulate through a
by-pass from the suction to the discharge.
Although reverse rotation is not destructive for
these models, it should be corrected as soon
as possible. Repeated reverse rotation over 24
hours may have negative impact on the bearings.
Reverse rotation will be obvious to the user as
soon as power is turned on: the compressor will
not build up pressure, the sound level will be
abnormally high and power consumption will be
minimal. If reverse rotation symptoms occur, shut
the compressor down and connect the phases
to their proper terminals. If reverse rotation is
not halted, the compressor will cycle o-on the
motor protection.
11FRCC.PC.037.A1.02 - part 2
PRELIMINARY
GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION
Approval and certicates
DSH scroll compressors comply with the
following approvals and certicates.
www.commercialcompressors.danfoss.com/
documentation/certicates/
Pressure Equipment
Machines directive
2006/42/EC
Low voltage directive
Internal free volume
Directive 97/23/EC
2006/95/EC
CE 0062 or CE 0038 or CE0871
(European Directive)
All DSH models
UL
(Underwriters Laboratories)
All DSH models
Other approvals / certicates Contact Danfoss
Products DSH090-105-120-140-161-184
Manufacturer’s declaration of incorporation ref.
Machines Directive 2006/42/EC
Contact Danfoss
Products DSH090-105-120-140-161-184
Declaration of conformity
ref. Low voltage Directive 2006/95/EC
Contact Danfoss
Products Internal free volume without oil (litre)
DSH090 12.4
DSH105 14.3
DSH120 14.3
DSH140 14.3
DSH161 14.3
DSH184 14.6
Products DSH090-105-120-140-161-184
Refrigerant uids Group 2
Category PED II
Evaluation module D1
Service temperature-Ts -35°C < Ts < 55°C
Service pressure - Ps 33.3 bar(g)
Declaration of conformity Contact Danfoss
12 FRCC.PC.037.A1.02 - part 2
PRELIMINARY
GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN
Design piping
General requirements Proper piping practices should be employed to:
1. Ensure adequate oil return, even under
minimum load conditions (refrigerant speed,
piping slopes…). For validation tests see section
“Manage oil in the circuit”.
2. Avoid condensed liquid refrigerant from
draining back to the compressor when stopped
(discharge piping upper loop). For validation
tests see section “Manage o cycle migration”.
General recommendations are described in the
gures below:
3. Piping should be designed with adequate
three-dimensional exibility to avoid excess
vibration. It should not be in contact with the
surrounding structure, unless a proper tubing
mount has been installed. For more information
on noise and vibration, see section on: “Sound
and vibration management”.
HP
4 m/s or more
0.5% slope
To condenser
max. 4 m
max. 4 m
0.5% slope
U-trap, as short as possible
4m/s or more
U trap, as short as possible
Evaporator
LP
8 to 12 m/s
HP
LP
Condenser
3D exibility
Upper loop
13FRCC.PC.037.A1.02 - part 2
PRELIMINARY
GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN
Design compressor mounting
General requirements
Single requirements
Compressors used in single applications must be
mounted with exible grommets
During operation, the maximum inclination from
the vertical plane must not exceed 3 degrees.
Compressors DSH090-105-120-140-161-184
come delivered with rubber grommets and
metal sleeve liners that serve to isolated the
compressor from the base frame.
The grommets must be compressed until contact
between the at washer and the steel mounting
sleeve is established. The required bolt size for
the DSH090-105-120-140-161-184 compressors is
HM8-40. This bolt must be tightened to a torque
of 15 Nm.
15 mm
HM 8 bolt
Lock washer
Flat washer
Steel mounting
sleeve
Rubber grommet
Nut
Tightening torque 15 Nm
14 FRCC.PC.037.A1.02 - part 2
PRELIMINARY
GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN
Test N° Purpose Test condition Pass criteria Solutions
1
Check proper
oil return
Minimum load condition (A)
Compressors running 6 hours.
Oil level must be visible or full in the
sight glass when the compressor is
running and when all compressors
of the circuit are stopped.
1. Top-up with oil, generally 3% of
the total system refrigerant charge
(in weight). Above 3% look for
potential oil trap in the system.
2 Oil separator can be added.
2
Oil return in
split systems
Since each installation is unique,
test 1 can not fully validate the oil
return. Oil level must be checked
and adjusted at commissioning.
Oil level must be visible or full in the
sight glass when the compressor is
running and when all compressors
of the circuit are stopped.
1. Pay special attention to “Piping
design”
2. Oil separator is strongly
recommended, espacially in case of
part load.
A
Manage oil in the circuit
R
Requirement
Evaluate the risk
Test, criteria and solutions
Oil level must be visible or full in the sight
glass when the compressor is running and when
all compressors of the circuit are stopped.
Single compressor
Non split Test N°1
Split Test N°1+2
15FRCC.PC.037.A1.02 - part 2
PRELIMINARY
GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN
Manage sound and vibration
Typical sounds and vibrations in systems can be
broken down into the following three categories:
• Sound radiation (through air)
• Mechanical vibrations (through parts and
structure)
• Gas pulsation (through refrigerant)
The following sections focus on the causes and
methods of mitigation for each of the above
sources.
Compressor sound
radiation
For sound radiating from the compressors,
the emission path is air and the sound waves
are travelling directly from the machine in all
directions.
Sound levels are as follows:
• For compressors running alone:
Compressor model
50 Hz 60 Hz
Acoustic hood
code number
Sound power
dB(A)
Attenuation
dBA
Sound power
dB(A)
Attenuation
dBA
DSH090 70 6 72 6 120Z0034
DSH105 71.5 6 74 6 102Z0035
DSH120 72.5 6 75 6 120Z0035
DSH140 * 72.5 6 76 6 120Z0035
DSH161 * 73.5 6 77 6 120Z0035
DSH184 75 6 78 6 120Z0135
Sound power and attenuation are given at ARI conditions, measured in free space
* For DSH140 code 3 and DSH161 code 3 use acoustic hood reference 120Z0135
Attenuation given with acoustic hood only
Note: During compressor shut down, a short
reverse rotation sound is generated. The duration
of this sound depends on the pressure dierence
at shut down and should be less than 3 seconds.
This phenomenon has no impact on compressor
reliability.
Mitigations methods:
We can consider two means to reduce
compressors sound radiations:
1. Acoustic hoods are quick and easy to install
and do not increase the overall size of the
compressors. Acoustic hoods are available from
Danfoss as accessories. Refer to the table above
for sound levels, attenuation and code numbers.
2. Use of sound-insulation materials on the inside
of unit panels is also an eective means to reduce
radiation.
16 FRCC.PC.037.A1.02 - part 2
PRELIMINARY
GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN
Manage sound and vibration
Mechanical vibrations
Gas pulsation
A compressor generates some vibrations that
propagate into the surrounding parts and
structure. The vibration level of a DSH090 to
DSH184 compressor alone does not exceed
120 µm peak to peak. However, when system
structure natural frequencies are close to running
frequency, vibrations are amplied due to
resonance phenomenon.
A high vibration level is damageable for piping
reliability and generates high sound levels.
Mitigations methods:
1. Danfoss DSH scroll compressors are designed
to produce minimal vibration during operations.
To ensure minimum vibrations transmission
to the structure, strictly follow mounting
requirements (mounting feet, rails etc..). For
further information on mounting requirements,
please refer to the § mounting assembly.
2. Ensure that there is no direct contact (without
insulation) between vibrating components and
structure.
3. To avoid resonance phenomenon, pipings and
frame must have natural frequencies as far as
possible from running frequencies(50 or 60Hz).
Solutions to change natural frequencies are to
work on structure stiness and mass (brackets,
metal sheet thickness or shape…)
The Danfoss scroll compressor DSH has been
designed and tested to ensure that gas pulsation
is optimize for the most commonly encountered
air conditioning pressure ratio. Manifolded
compressors are equivalents to lagged sources
of gas pulsation. Therefore, pulse level can vary
during time.
Mitigations methods:
If an unacceptable level is identied, a discharge
muer with the appropriate resonant volume
and mass can be installed.
17FRCC.PC.037.A1.02 - part 2
PRELIMINARY
GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN
Manage operating envelope
R
Requirement
The operating envelope for DSH scroll
compressors is given in the gures below and
guarantees reliable operations of the compressor
for steady-state and transient operation.
Steady-state operation envelope is valid for a
suction superheat within 5K to 30K range.
DSH090 – 184 operating envelope is showed below:
Condensing temperature (°C)
Evaporating temperature (°C)
-40
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
-35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55
1
3
2
2
4
4
S.H. = 5 K
S.H. = 30 K
Area 1: Continuous running SH 5 to 30K
Area 2: for start only: 1 min.30sec/start
Area 3 for start only: 8sec./start
Area 4: outside map
Area 1+2+3: Start/restart map
Pressure settings R410A
Working range high side bar(g) 9.9-44.5
Working range low side bar(g) 1.7-15.5
Maximum high pressure safety switch setting* bar(g) 45
Minimum low pressure safety switch setting bar(g) 1.5
Minimum low pressure pump-down switch setting** bar(g) 1.7
*Maximum allowable pressure on high pressure side according to PED regulation.
**Recommended pump-down switch settings: 1.5 bar below nominal evap. Pressure with minimum of 1.7bar(g)
18 FRCC.PC.037.A1.02 - part 2
PRELIMINARY
GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN
Manage operating envelope
R
LP and HP safety switches must never
be bypassed nor delayed and must stop all the
compressors.
When caused low by LP safety switch, limit the
number of auto-restart to maximum 5 times
within 12 hours.
HP safety switch must be manual reset
Depending on application operating envelope,
you must dene HP and LP limits within
operating envelope and pressure setting table
above.
For DSH090-105-120-140-161-184 compressors,
the external Discharge Gas Temperature
protection (DGT) is required if the high and
low pressure switch settings do not protect
the compressor against operations beyond its
specic application envelope.
The discharge gas thermostat accessory kit (code
7750009) includes all components required
for installation as shown on the right. DGT
installation must respect below requirements:
• The thermostat must be attached to the
discharge line within 150 mm from the
compressor discharge port and must be
thermally insulated and tightly xed on the
pipe.
• The DGT should be set to open at a discharge
gas temperature of 135°C.
Evaluate the risk We consider two types of operating envelope management:
Basic:
• HP and LP switch
• MOP (Max Operating Pressure) ensured by expansion
device
• Condensing pressure control
• DGT
Advanced:
• HP and LP sensor
• Operating envelope limits (permanent and transient)
integrated into control logic
• DGT
See “Test, criteria and solutions” No additional test are required
HP switch setting
MOP + test N
o
3
LP switch setting
Condensing pressure control
DGT (integrated)
tests N
o
1 and 2
Discharge line
Insulation
Bracket
Thermostat
Test, criteria and solutions
Test N° Purpose Test condition Pass criteria Solutions
1
Check that Area
1 is reached
within maximum
transient time
Start test at minimum foreseeable
evaporating temperature (minimum
ambient temerature...)
Reach Area 1 within maximum
transient time
Work on compressor staging, fan
staging, water ow etc...
2
Perform a defrost test if reversible
unit
3
Perform a start-up test at maximum
foreseeable evaporating temperature
(max ambient temperature, or start
up with hot water…)
Improve MOP function.
Work on compressor staging,fan
staging, water ow etc...
19FRCC.PC.037.A1.02 - part 2
PRELIMINARY
GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN
Manage superheat
During normal operation, refrigerant enters
the compressor as a superheated vapor. Liquid
ood back occurs when a part of the refrigerant
entering the compressor is still in liquid state.
Liquid ood back can cause oil dilution and, in
extreme situations lead to liquid slugging that
can damage compression parts.
Requirement
Evaluate the risk
In steady state conditions,
• Suction superheat must remain within 5K to 30K
• Discharge superheat must be higher than 15K
• Oil superheat must be higher than 10K
In transient conditions,
• Discharge superheat must be higher than 5K
• Oil superheat must be higher than 10K
Use the tables below in relation with the system
charge and the application to quickly evaluate
the risk and potential tests to perform.
Charge limit is dened in table below:
Discharge temperature sensor must be placed
onto the discharge tting and be insulated.
Oil temperature sensor must be placed between
oil sight glass and compressor baseplate and be
insulated.
BELOW cHargE Limit aBOVE cHargE Limit
Non reversible No test or additional safeties required Liquid ood back test
Reversible Defrost test
Liquid ood back test
Defrost test
Models
Refrigerant charge limit
(kg)
DSH Single
DSH090 5.9
DSH105 7.9
DSH120 7.9
DSH140 7.9
DSH161 7.9
DSH184 7.9
20 FRCC.PC.037.A1.02 - part 2
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
/
