Sanden Vendo CDU-L R06A2B User manual

Delivering CO2solutions
in commercial refrigeration
SANDEN
CO2RETAIL SOLUTIONS
CDU-L R06A2B 3 Phases 400V
installation guide
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Table of content
1. Product specifications
2. Product diagram
3. Operation diagram
4. Installation instruction
5. Handling
6. Piping connection
7. Power supply connection
8. External ON/OFF control signal
9. Piping and vacuuming
10. CO₂ charging
11. Parameters changing
12. First level of maintenance
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1. Product specifications CDU-L
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2. Product diagram CDU-L
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3.1. Operation diagram:
MT loop A&B
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2
3
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Loop-A
Loop-B
Loop-C
OFF
MT A&B (Te -5℃Tambient 10 ℃)
Loop-A
(CLA)
Loop-B
(CLB)
Loop-C
(CHC)
5 1
2
3
4
Loop-A
Loop-B
MT A&B (Te -5℃Tambient 25 ℃)
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7
8
910
Loop-C

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1
2
3
4
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910
Loop -A Loop -B
Loop -C
LT A&B (Te -30℃Tambient 25 ℃)
Loop-A
(CLA)
Loop-B
(CLB)
Loop-C
(CHC)
3.2. Operation diagram:
LT loop A&B

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1A
2A
3A
4A
5A
1B
2B
3B
4B
5B
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Loop A: LT (Teva -30℃)
Loop B: MT (Teva -5℃)
Loop C: High stage compressor
Ambient Temperature : 25℃
1A
2A
3A
4A
5A
1B
2B
3B
4B
5B
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910
Loop A
Loop B Loop C
LT loop A & MT loop B
Loop A
(CLA)
Loop B
(CLB)
Loop -C
(CHC)
3.3. Operation diagram:
LT loop A & MT loop B

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4.1. Installation design of CDU-L
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1. Piping length
For Medium Temperature application
In case of several evaporators installed on a cooling loop, the total piping length must not exceed 60m (supply and return)
In case of single evaporator installed on a cooling loop, the distance should not exceed 30m (meaning 60m maximum piping, supply and return)
For Low Temperature application:
Only a single evaporator is installed per cooling loop, the distance should not exceed 20m (meaning 40m maximum piping supply and return)
Installation beyond this distance results in a lack of cooling and oil returned to compressor.
2. Evaporator volume
Medium Temperature application : < 15dm3 (risk of poor lubrication if > 15dm3)
Low Temperature application: < 5dm3 (risk of poor lubrication if > 5dm3)
3. Cooling capacity
4. Performance drop
* Please follow SANDEN requirement to avoid performance drop and ensure good lubrication of the compressor.
SANDEN requirement for CDU-L Installation design conditions

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4.2. Installation condition
CDU L: Distance 500 mm
from wall or barrier
Installation conditions
•Provide space on the top of product for the opening of product casing.
•Provide at least 500 mm of free space on the left and right-hand side and the front and
back.
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1. Installation conditions:
Provide space above the equipment to allow it to be opened (access for maintenance / reparation
operations).
Provide at least 500 mm of free space on the right-hand side.
Provide at least 500 mm of free space on the left-hand side and the front and back.
Protect direct sunlight and
then do not disturb fan air flow

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4.3. Installation condition
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2. Install the equipment in a dry and well-ventilated location, where air isn't recycled.
3. Place the equipment in a location sheltered from direct sunlight, heat sources and cold wind. If
exposing the equipment to direct sunlight is unavoidable, protect the device with a canopy.
4. Choose a location where the noise produced by the refrigerating unit will not disturb any close
neighbors. The noisiest parts are located on sides and at the back of the unit.
5. The air outlet must not be directed towards house windows or plantations.
6. Place the equipment on a solid, smooth surface.
7. Place the equipment in a location where dust and debris do not risk being sucked into the
evaporator fins.
8. In regions where significant snowfalls occur, always place the equipment under a roof, a shelter or
a snow-proof tarpaulin.
9. Choose a location that is protected from strong winds,
10. Avoid locations exposed to oil splashes, salt (within 2km from coast), sulfur gas (nearby hot water
springs), volcanic area.
11. To avoid any interference, the refrigerating unit must be installed at a minimum distance of 3 m
from any device producing or receiving electromagnetic waves (e.g. radio).

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5. Handling
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When raising the refrigerating unit, always observe the following safety precautions:
1. Protect any parts that are in contact with hoisting ropes, e.g. using cardboard.
2. When the refrigerating unit is raised, do not go beneath it.
3. Weight: CDU-L: Product weight: 135kg Total weight including packaging: 145kg
4. This product's weight is not evenly distributed.
In particular, take care to avoid any shocks and sudden movements when transporting
and raising the equipment.

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6.1. Piping connection
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Pipe slope
1. Pipe working pressure:
2. Pipe insulation mandatory
19mm for MT application
32mm for LT application
2. Avoid CO2pipes contact with other conducts or
pipes.
3. Avoid installation in corrosive environment.
Low-pressure equipment
(Evaporator)
Low-pressure
equipment
(Evaporator)
Diameter MWP [bar]
Discharge side HP 1/4" à 3/8" >120 bar
Suction side LP 3/8" à 1/2" >90 bar

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6.2. CDU-L connected to single evaporator
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Remarks
It’s not necessary to add expansion valve on evaporator because the CDU has is own expansion valve.
Add just thermostat device with defrost control
Evaporator volume
MT : < 15000cc ( if more risk of poor
lubrication).
LT: < 5000cc ( if more risk of poor
lubrication).

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6.3. CDU-
L connected to several evaporators
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Remarks:
Expansion valve for each evaporator. One Pressure sensor by loop. Evaporator volume:
MT : < 15000cc ( if more risk of poor lubrication).
LT: < 5000cc ( if more risk of poor lubrication).

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7. CDU-L power supply connection
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Rated power 5,4kW
Voltage 400V AC
Frequency 50/60 Hz
Electric consumption 5,5kW
Rated curent 8,5A
Electrical power 6,9kVA
Ground fault circuit breaker 10A
Power supply
Communication
Cabinet regulator
GND
Cooling demand on CLA & CLB , dry contact.
The alarm contact deliver AC 230V in case of error.

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8.1. External ON/OFF control signal
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System control logic
1. The cooling demand is managed by dry contact sent to the CDU (terminals CLA/CLB) see page 15
2. The speed of compressor controls the LP to reach the set point tuned by the installer (A02/B02) see page 25
3. The low pressure is function of the evaporating temperature required for the showcase. (Tev = Tair_sc – T).
4. Electronic Expansion Valve (EEV) of the CDU controls the HP to reach the HP target.
This HP optimal target is calculated in accordance with ambient outside temperature and the LP set point.
5. Showcase EEV controls the superheat at the evaporator side
Defrost control logic
1. CDU compressors and fans should stop before the evaporator defrost.
2. Dry contact signal is sent to the CDU when defrost is requested Defrost (terminal CLA/CLB) see page 15.
3. Compressors will stop gradually depending current speed.
4. For installation with several evaporators, one EEV evaporators side must stay opened to avoid High Pressure
failure during stopping session. See wiring example page 18

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8.2. Electrical connection
(Thermostat & 1 evaporator)
P
N
Supply
thermostat
Contact
Fan
Contact
Defrost
FAN Resistance
CDU-L
CLA / CLB
Dry
Contact
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8.3. Electrical connection
(DANFOSS regulator & several evaporators)
Mandatory to supply 1 of the AKVH during the ramp down of the CDU to avoid discharge pressure cut.
AKVH control R14=01 (On/Off)
Remarks : The contact of auxiliary relay KA… (NO) must be wiring in parallel on the CDU ( contact CLA or CLB )
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9.1. Piping and vacuuming process
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1. Brazing connection pipe
1-1. Check that cabinet EEV is completely opened.
1-2. Before brazing, insert 2bar nitrogen gas flow into pipe for preventing deposition
of any oxide film on the inner surface of the piping, and also avoid heating up
service valve by wet towel cover etc.
1-3. During brazing, be careful for burning insulation & any CDU components.
2. Leakage test
2-1. Power supply on CDU & wait 20 sec for initializing system.
2-2. Charge Nitrogen gas in 80bar or 55bar if using 60bar relief valve.
2-3. Check brazed part using leakage detector or leakage test liquid. (formability)
3. Vacuuming
3-1. Set R744(CO₂) manifold, vacuuming pump, CO₂ vessel, and CDU service port.
3-2. Connect CO₂ charge tube, vacuuming tube, and each equipment.
3-3. Check connector and each tube are closed tightly.
3-3. Loose service valve rod in middle position (3 way opening) before vacuuming.
3-4. Vacuuming for 2-3 hours inside pressure keeping -1bar(vacuuming status)
4. Setting parameter value
4-1. Change each loop parameter set depending on target evaporating temperature
during vacuuming process. (suction pressure default value 3,0MPa)

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9.2. CDU connection to the evaporators
1. Remove process pipe
2. Insert pipe
3. Brazing pipe
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