Seifert 871220201USL User manual

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Table of Content 871220201USL
1. User manual 2 ..................................................................................................................................
2. Legal regulations 3 .........................................................................................................................
3. Safety instructions 4 ......................................................................................................................
4. Settings 5 .........................................................................................................................................
5. Functional principle 6 .....................................................................................................................
6. Technical data 7 ..............................................................................................................................
7. Performance graph 8 ......................................................................................................................
8. Mounting 9 .......................................................................................................................................
9. Condensate management 10 .........................................................................................................
10. Mounting Principle 11 ..................................................................................................................
11. Cut Out Dimension 12 ...................................................................................................................
12. Dimension (H x W x D) 13 ............................................................................................................
13. Controller 14 ..................................................................................................................................
14. Wiring Diagram 21 ........................................................................................................................
15. Taking into Operation 22 .............................................................................................................
16. Trouble Shooting 22 .....................................................................................................................
17. Maintenance & Cleaning 23 .........................................................................................................
18. Transport & Storage 24 ................................................................................................................
19. Parts supplied / Spare parts / Accessories 25 ..........................................................................

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1. User manual
This instruction manual contains information and instructions to enable the user to work safely, correctly and
economically on the unit. Understanding and adhering to the manual can help one:
Avoid any dangers.
Reduce repair costs and stoppages.
Extend and improve the reliability and working life of the unit.
PLEASE ENSURE TO USE THE RIGHT VERSION OF THE INSTRUCTION MANUAL SUITABLE FOR YOUR
UNIT.
Intended use
󰾬The unit is to be used exclusively for the dissipation of heat from control cabinets and enclosures (stationary,
not moving) in order to protect temperature sensitive components in an industrial environment. To meet the
conditions of use, all the information and instructions in the instruction manual must be adhered to.
General danger
Indicates compulsory safety regulations which are not covered by a specific
pictogram such as one of the following.
High electric voltage
Indicates electric shock danger.
Important safety instruction
Indicates instructions for safe maintenance and operation of the unit.
Attention
Indicates possible burns from hot components.
Attention
Indicates possible damage to the unit.
Instruction
Indicates possible danger to the environment.

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2. Legal regulations
Liability
The information, data and instructions contained in this instruction manual are current at the time of going to
press. We reserve the right to make technical changes to the unit in the course of its development. Therefore,
no claims can be accepted for previously delivered units based on the information, diagrams or descriptions
contained in this manual. No liability can be accepted for damage and production caused by:
Disregarding the instruction manual
Operating error
Inappropriate work on or with the unit
The use of non-specified spare parts and accessories
Unauthorised modifications or changes to the unit by the user or his personnel
The supplier is only liable for errors and omissions as outlined in the guarantee conditions contained in the main
contractual agreement. Claims for damages on any grounds are excluded.

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3. Safety instructions
Upon delivery the unit is already meeting current technical standards and can therefore be safely taken into
operation. Only authorised personnel is allowed to work on the unit. Unauthorised personnel must be prohibited
from working on the unit. Operating personnel must inform their superiors immediately of any malfunction of
the unit.
Please note that before starting to work on or with the unit, a procedure must be carried out inside the cabinet
on which the unit is to be mounted.
Before commencing work inside the cabinet, the control cabinet manufacturer's instruction must be read with
regards to:
Safety instructions.
Instructions on taking the cabinet out of operation.
Instructions on the prevention of unauthorised cabinet reconnection.
The electric equipment meets the valid safety regulations. One can find dangerous voltages (above 50 V AC or
above 100 V DC)
Behind the control cabinet doors.
On the power supply in the unit housing.
The unit has to be operated according to the type plate and the wiring diagram, and must be protected
externally from overloading and electrical faults via suitable protective devices.
Danger through incorrect work on the unit
The unit can only be installed and maintained by technical competent and qualified
personnel, using only supplied material according to the supplied instructions.
󰾬
Danger from electrical voltage
Only specialised personnel are allowed to maintain and clean the unit. The personnel must
ensure that for the duration of the maintenance and cleaning, the unit is disconnected from
the electrical supply.
Attention
Damage to the unit through the use of inappropriate cleaning materials. Please do not use
aggressive cleaning material.
Instruction
Damage to the environment through unauthorised disposal. All spare parts and associated
material must be disposed according to the environmental laws.

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4. Settings
The cooling unit is intended to be used as a complementary accessory to larger industrial equipment. The unit
is used where heat needs to be dissipated from electrical control cabinets or similar enclosures in order to
protect heat sensitive components. It is not intended for household use.
The unit has two completely separate air circuits which ensure that the clean cabinet air does not come into
contact with the ambient air which may well be dirty or polluted.
Enclosure cooling units can dissipate large quantities of heat from sealed enclosures such as electrical
enclosures into the ambient air and at the same time reduce the cabinet internal temperature to below that of
the ambient air. The unit can function without problems in extreme ambient conditions (e.g. dusty and oily air).
For the cooling capacities, operating temperatures and environmental ratings please refer to the type plate
data.

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5. Functional principle
The cooling unit for enclosures works on the basis of a refrigeration circuit consisting of four main
components: compressor, evaporator, condenser and expansion device.
The circuit is hermetically sealed and R134a refrigerant circulates inside it (R134a is chlorine free and has an
Ozone Destruction Potential [ODP] of 0 and a Global Warming Potential [GWP] of 1430). The compressor
compresses the refrigerant (thus taking it to high pressure and high temperature), and pushes it through the
condenser, where it is cooled by ambient air thus passing from the gas to the liquid state. At the liquid state it
then passes through the capillary pipe being a much lower pressure the refrigerant arrives to the evaporator
where it absorbs the necessary heat to change from liquid to gas state. The gas is then drawn back into the
compressor completing the cycle.
1 Air intake cabinet side 6 Air intake ambient side
2 Radial fan cabinet side 7 Air intake ambient side
3 Evaporator 8 Condenser
4 Air outlet cabinet side 9 Air outlet ambient side
5 Compressor 10 Filter dryer
11 Expansion device

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6. Technical data
Order Number 871220201USL
Cooling capacity L35L35 1.12 kW @ 50 Hz
1.20 kW @ 60 Hz
Cooling capacity L35L50 980 W @ 50 Hz
1.1 kW @ 60 Hz
EER L35L35 1.64 / 1.5
Compressor type Reciprocating compressor
Refrigerant / GWP R 134a / 1430
Refrigerant charge 210 g / 7.5 oz
High / low Pressure 30 / 6 bar
435 / 88 psi
Operating Temperature Range -40°C - 60°C
UL temperature range -40°C - 60°C
Air flow volume (system / unimpeded)
Ambient air circuit: 280 / 550 m³/h
Cabinet air circuit: 300 / 470 m³/h
Mounting Wall mounted
Housing Material Mild steel, powder coated
Dimensions A x B x C (D+E) 585 x 305 x 305 mm
Weight 35 kg
Cut out dimensions 345 x 235 mm
Voltage / Frequency 400/460 V - 50/60 Hz 2~
UL Voltage / Frequency 460 V / 60Hz 2~
Current L35L35 2.0 A @ 50 Hz
1.85 A @ 60 Hz
Starting current 8.6 A
Max. current 2.3 A
Nominal power L35L35 740 W @ 50 Hz
835 W @ 60 Hz
Max. power 1.05 kW
Fuse 15 A (T)
Max circuit ampacity 15 A
Short-circuit current rating 5 kA
Rated current compressor 1.3 A
Full load current fans 0.4 A
Connection 5 pole terminal block for signals, 4 pole terminal block for
power
Ingress Protection IP 56 / Type 12, 3, 3R, 4
Approvals CE, UL(ACVS), cULus

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7. Performance graph

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8. Mounting
Unpacking unit:
Please follow the below steps to unpack the unit.
STEP 1:
Stand the cooling unit upright with the pre-cut packaging opening facing up.
STEP 2:
Pull off the packaging opening.
STEP 3:
Hang the transport loop of the unit in the transport hook and lift it slightly.
STEP 4:
Pull off the packaging and slide out the tray with installation material and the short version of the operating
manual.
STEP 5:
Pull off the remaining packaging.
STEP 6:
The cooling unit can now be attached to the enclosure.

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Mounting:
The power supply rating on unit rating plate must comply with mains rating.
Always disconnect the power supply before opening the unit.
The heat load to be dissipated from enclosure should not exceed specific cooling output of the unit at any
condition. At cooling unit selection always cater for a safety margin of at least 15% extra cooling output in the
worst conditions. Air inlets and outlets must be completely free from obstruction.
Ensure that flows of air leaving and entering the cooling unit, internal and external, are not obstructed. Cooling
unit enclosure air suction hole must be installed in the highest possible point. When installing the unit on a door
ensure it can take the weight.
Before drilling the enclosure ensure the fixing elements and couplings will not interfere with the equipment
inside the enclosure itself. Disconnect power before starting any work inside the enclosure. Following this 1:1
Scale Drilling Template drill the holes and make the required cuts on the enclosure. This template may have
been affected by storage conditions, please check this template by verifying values of the largest dimensions
before drilling. Fit the sealing strip on the cooling unit on the side connected to the enclosure and follow the
installation diagram.
This AC unit can only be mounted to a suitably Type rated enclosure to maintain it's Type rating. The Type and
IP rating of the enclosure should be the same or higher than that of the unit.
9. Condensate management
High humidity and low temperatures inside the enclosure can lead to condensation on the evaporator.
Condensate that flows back into the enclosure can damage sensitive control electronics. The integrated
condensate evaporation of the cooling unit releases the condensate to the environment. If condensate
formation is too great, additional condensate can drip into an overflow trough, which then drains off on the
ambientt side.In order to prevent the formation of excessive condensate, you should nevertheless:
- check the seals at regular intervals
- consider installing a door contact switch (order no. 3100001). This can prevent condensation forming
when enclosure door is left open.

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10. Mounting Principle
NOTES:
Do not use within the first 15 minutes after installation!
Use only the supplied mounting hardware.
Tighten Screws to 4.5 Nm.
Ensure the mounting surface does not warp after assembly and reinforce it if necessary.
1 M6 bolts
2 M6 toothed washers
3 M6 Flat washers
4 Enclosure
5 Mounting gasket
6 Cooling unit

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11. Cut Out Dimension

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12. Dimension (H x W x D)

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13. Controller
The display shows the temperature in the range of -30°C to 110°C. The temperature is displayed with a
resolution of 0.1°C between -9.9°C and 99°C, and 1°C between -30°C and -10°C, and between 100°C and
110°C. On start-up, the screen shows the unit’s internal temperature, and this is considered the Home Menu of
the controller.
Buttons LED Functions
◻ Menu Blue LED: Steady On - Cooling mode
◯ Set Blue LED: Blinking - min. comp. off time not elapsed
△ Up Red LED: Steady On - Heating mode (opt.)
Red LED: Blinking - Alarm
▽ Down Rightmost digit – Master/Slave indicator
i) Operations from Home Screen:
Pressing △ or ▽ for 1 second will go to Menu 1. This will show the status of DI1, DI2, S1, S2, Onboard
Sensor and total Alarms. Pressing △ or ▽ will toggle between sensors/digital inputs and alarms.
Pressing ◻ will go to Menu 2.
Any Alarms will appear on the Home Screen.
If the Door Contact is Open, the Home Screen will show an OFF status.
Pressing △ and ▽ simultaneously for 3 seconds will start Test Mode
ii) Operations from inside the Menus:
Pressing ◻ from any menu will return to the Home Screen.
Pressing ◯ while in Menus 2/3 shows the parameter value.
Pressing ◯ for 3 seconds while showing a parameter, will save the parameter.
Pressing ◻ while showing a parameter, will return to the respective menu.
iii) Menu Access using passwords :
As standard, the user can only access Menus 1 and 2.
When using the client password, the user is allowed access to Menu 3.
This password can be set at any value between 0 and 9998.

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All parameters are sorted in 3 separate menus.

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Test mode
Test mode is started by simultaneously pressing △ and ▽ for 3 seconds from the Home screen.
When Test run is active, tESt will be shown blinking on the display.
Test procedure when Internal Temperature is between 10°C and 50°C
0 - 30 seconds Ambient blower
30 seconds - 5:30 minutes Ambient blower + compressor
5:30 - 6:30 minutes Ambient blower + heater
Master / Slave and Redundancy Functionality
i) Master / Slave Mode - Specifications
Network of maximum 10 units.
The Modbus addresses of the units need to be set manually.
Unit addresses need to be between 1 and 10.
The Master unit must be set with Address 1. When setting a master, an extended menu opens to set the
Master/Slave and Redundancy modes.
The Master unit is the unit which controls all the Master/Slave and Redundancy Operations.
The Client only needs to set the Master, the other units (addresses 2 to 10) do not need to be set and will
convert to Slaves automatically. For a unit to be a slave and included in the network, an address between
2 and 10 needs to be pre-set.
When communication with the Master is lost, all Slaves will return to normal mode.
Setting the number of units in the network is not required as the Master will try to communicate with all
Slaves (units 2 to 10), but operates the algorithm based on the online units.
Every pre-defined time, the Master unit will try to communicate with the Offline Units.
If a Slave is in an alarm condition, the Master will power the Alarm LED, but does not show the Alarm
code.
The system can operate in Master/Slave only, Master/Slave + Redundancy or Redundancy Only.
If a unit needs to operate in Heating Mode, any Master/Slave/Redundancy operation is ignored. If the
Master needs to operate in Heating Mode, the Slaves continue to operate in Master/Slave/Redundancy
mode and enter cooling mode if necessary. The algorithm for the slaves will still be controlled by the
Master, although the Master may possibly be in heating mode.
The Master can only be enabled via the Display or via Gateway. It can be enabled via Modbus, but for the
Gateway operation only rather than for Client use and a Modbus Controller will not be able to
communicate with the units anymore. The Seifert Gateway acts as a Slave in the Master/Slave network
and will still be able to communicate with the Master.

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When a network is in MSR mode, the flashing of the 4th digit dot (right most digit), indicates the status of the
unit in the MSR status. Below is a table describing the flashing based on the unit status.
Master settings
MS2: Master Modes
None:
All units are Independent of each other.
Each unit operates using its own setpoint and its own Internal Temperature.
The Master still communicates with the Slave units to gather information in case information needs to be
communicated to the Gateway.
Identical Mode:
All units operate as one single unit.
The Master operates using the Maximum Internal Temperature in the network, and the Slaves follow the
operation of the Master.
In this mode, the client needs to only set the Master setpoints.
If a Slave needs to execute the heating mode, Master/Slave operation is ignored.
If the Master needs to execute the heating mode, the Slaves will keep operating on the Maximum Internal
Temperature of the network.
Power Mode:
All units operate using the Master Setpoints but using their own Internal Temperature.
If any unit Internal Temperature exceeds the Master Control Setpoint + Delta, the Master takes back
control of all the Slaves and operation is changed to Identical Mode.
If all Internal Temperatures fall below the Master Control Setpoint, control is released from the Master and
the Slaves will operate Independently based on their own Internal Temperature whilst using the Master
Setpoints.
If a Slave needs to operate in heating mode, Master/Slave operation is ignored.
If the Master needs to operate in heating mode, the Slaves will keep operating on the Maximum Internal
Temperature of the network.

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ii) Redundancy Mode
Redundancy settings
Display Description
rS1 Redundancy Modes: None, Mode A, Mode B
rS2 Start-up Mode
rS3 Changeover Timeout in Minutes
RS1: Redundancy Modes:
None:
No redundancy, all units operate normally
Mode A:
In this mode, there will be 2 sets of units, and they will toggle between each other after a pre-defined time. The
start-up units are settable.
Below is an example, starting with Units 1 to 4 ON (Blue ON, White OFF)
Mode B:
In this mode, the system will ‘move’ one unit at a time after the pre-defined time.
Below is an example, starting with Units 1 to 4 ON
Setting rS2, Start-up Mode, indicate the number of units to start when redundancy is active (Mode A/B). If the
setting is set to 4, this means that on the first cycle, unit 1 to 4 are switched ON. If setting is set to 4 but unit 2
is offline, on the first cycle, units 1, 3, 4, 5 are ON.
Setting rS3, Changeover Timeout, indicates the duration of each cycle. This can be a value from 1 to
9999 minutes.
If a Slave needs to execute heating mode, Redundancy operation is ignored.
If the Master needs to execute heating mode, the Slaves will keep operating based on the Redundancy
Algorithm.

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The redundancy time increases only if there is at least one active (non-redundant) unit cooling from the
active units group.
The changeover between units happens only if no active unit is cooling.
Modbus Communication
Detailed instructions on Modbus communication can be found in the link below.
https://seifertsystems.com/site/assets/files/6903/rdtg2001-0_2_-_generic_modbus_table.pdf
Futher notes:
From Modbus side, any setting can be with 0.1°C precision. From the display, the precision is 0.5°C.
When having a setting, example 30.4°C, this will be rounded to 30.5°C when accessed via display.
When Ambient, Icing and Pressure are not enabled, the value displayed (Modbus) is -50°C.
When saving settings via communication, S is shown on display for 1 second.
When system goes in Cooling Mode, C is shown on display for 1 second.
When system goes in Heating Mode, H is shown on display for 1 second.
When accessing the Display Settings of Menu 2/3, any settings from Modbus are ignored.
When running a test with the door contact open, the display only shows TEST, since the unit will not be
OFF.
When running a test with Alarms, the Alarms and TEST are shown together.
When unit is not Modbus Address 1, the Master/Slave and Redundancy parameters are hidden from
Menu3 when using Client Password. (MS1, MS2, MdL, rS1, rS2, rS3).
The Blue LED is ON when the unit is cooling.
A red LED is ON when the unit is heating.
The red LED flashes when an alarm is present.