Seifert 872520201USL User manual

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Table of Content 872520201USL
1. User manual 2 ..................................................................................................................................
2. Legal regulations 2 .........................................................................................................................
3. Safety instructions 3 ......................................................................................................................
4. Controller functions 4 .....................................................................................................................
5. Functional principle 7 .....................................................................................................................
6. Technical data 8 ..............................................................................................................................
7. Mounting 9 .......................................................................................................................................
8. Mounting Principle 10 .....................................................................................................................
9. Dimensions (H x W x D) 11 .............................................................................................................
10. Electrical connection 12 ...............................................................................................................
11. Wiring diagram 12 .........................................................................................................................
12. Taking into operation 13 ..............................................................................................................
13. Trouble shooting 14 ......................................................................................................................
14. Maintenance & Cleaning 14 .........................................................................................................
15. Transport & Storage 15 ................................................................................................................
16. Parts supplied 15 ..........................................................................................................................

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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.
Conditions of use
󰾬The unit is to be used exclusively for the dissipation of heat from control cabinets and enclosures in order to
protect temperature sensitive components in an industrial enviorment. 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.
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:

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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.
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 such as ground fault protection
breakers.
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. Controller functions
The air conditioner 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 private / 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) with a standard
operating temperature ranging between +10°C (50°F) and +55°C (131°F). Units can be ordered with an
additional electrical cabinet heater. For the cooling capacities and evironmental ratings please refer to the type
plate data.
Controller
The display shows the temperature in the range of -50°C to +150°C (-58°F to +302°F). The temperature is
displayed with resolution of tenths between -19.9°C and +99.9°C (-3.8°F to +211.8°F). During programming, it
shows the codes and values of the parameters. The display also shows icons according to occurring events.
Display icons
Icon Function Description
1 Compressor relay active Flashes when activation is delayed or inhibited by
protection times, external disabling or other procedures
in progress
2 Alarm relay active
3 Heater relay active
4 Ambient blower relay active
Alarm Flashes when alarms are active
Heating mode Signals operation of unit in heating mode
Cooling mode Signals operation of unit in cooling mode
TEST Text mode in progress Activated only by manual procedure
Programming
The operating parameters can be modified using the front keypad. Access differs depending on the type of
parameter. Access to configuration parameters is protected by a password that prevents unwanted
modifications or access by unauthorised persons.

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Setting cooling set point, St1:
1. Press “SET” and display should show St1 and then the pre-set value of St1. (default: +35°C / +95°F)
2. Reach the desired value by using ▲ or ▼.
3. Press “SET” again to save the new value of St1.
Setting heating set point, St2 (only for units supplied with internal heater):
1. Press “SET” twice slowly and display should show St2 and then the pre-set value of St2. (default: +5°C /
+41°F)
2. Reach the desired value by using ▲ or ▼.
3. Press “SET” again to save the new value of St2.
󰾬Setting temperature units (°C / °F), low temperature alarm and high temperature alarm:
1. Press “PRG” button for 5 seconds to reach the modifiable parameter list.
2. Use ▲ or ▼ to reach the desired parameter:
C18 for temperature unit of measure
°C = 0
°F = 1
P25 for low temperature alarm threshold (default -10°C / +14°F)
P26 for high temperature alarm threshold (default +55°C / +131°F)
3. Press “SET” on the desired parameter to display the current value.
4. Use ▲ or ▼ to reach the desired value.
5. Pressing “SET” temporarily saves the new value and returns to the parameters list.
6. Repeat steps 2-5 to set other parameters.
7. Press “PRG” for 5 seconds to permanently save the new values.

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Set Point Parameter Default Range
Cooling St1 35°C / 95°F 20°C - 50°C / 68 -122°F
Heating (for units with heater) St2 5°C / 41°F -20°C - 20°C /-4°F - 68°F
Low Temperature Alarm P25 -10°C / 14°F -50°C - P26 / -58°F - P26
High Temperature Alarm P26 55°C / 131°F P25 - 150°C / P25 - 302°F
Test function:
Different test functions can be used depending on the combination of keys pressed. Such tests run for the
duration of 4 minutes.
“SET+▲” tests Compressor and Ambient Blower relays.
“SET+▼” tests Alarms and Heater relays
Alarm Relay Operation:
Both normally closed (NC) and normally open (NO) alarm contacts are provided. These refer to the alarm state.
Under normal conditions, the NC contact is closed and the NO contact is open. When an alarm condition is
present or the door contact is open, the NC contact will open and the NO contact will close. System power
failure will give an alarm condition.
State Alarm relay Display
1 System powered OFF
2 System powered ON
- NO ALARM
- Door Contact Closed
3 System powered ON
- Door Contact Open
4 System powered ON
- ALARM STATE
Notes:
State 2: Additional icons (1,3,4, Reverse, Direct, Test) depending on operation.
State 3: The display shows “OFF” alternating with the standard display.
State 4: The display shows “EXX” alternating with the standard display – at the same time, the alarm icon
flashes.
Typical alarm codes:
Error Code Description
E01 Probe B1 fault
E02 Probe B2 fault
E04 High temperature alarm
E05 Low temperature alarm

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Important Notes:
Whilst programming, if no button is pressed for 10 seconds, the display starts flashing, and after 1 minute
returns to the main display without saving changes.
To increase scrolling speed, press and hold the ▲ or ▼ button for at least 5 seconds.
When pressing “PRG” for 3 seconds, the firmware revision code is displayed for 2 seconds.
When cleaning the controller panel, do not use ethanol, hydrocarbons, ammonia or their by-products.
Use neutral detergents and water.
In order to protect the unit’s components, minimum relay output on (3 or 7 minutes) and off (4 minutes)
times and minimum time (7 or 11 minutes) between activation of the same relay output are applied.
In case of digital inputs not configured, probes not fitted or configured, or St2 not enabled on the
controller the display shows ‘nO’.
5. Functional principle
The unit functions on the principle of the compression refrigerator. The main components are: refrigerant
compressor, condenser, choke and evaporator. these four components of the refrigerant plant are connected
with each other by pipes to form a hermetically sealed system in which the refrigerant (R134a)
circulates. R134a is chlorine free and has an Ozone Destruction Potential [ODP] of 0 and a Global Warning
Potential [GWP] of 1430.
1. Air intake, cabinet side 7. Radial fan, ambient side
2. Radial fan, cabinet side 8. Condenser
3. Evaporator 9. Air outlet, ambient side
4. Air outlet, cabinet side 10. Filter dryer
5. Compressor 11. Capillary pipe
6. Air intake, ambient side

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6. Technical data
Order Number 872520201USL
Cooling capacity 95F/95F 8,500 BTU
Cooling capacity 95F/122F 7,650 BTU
EER L35L35 1.8
Compressor Reciprocating compressor
Refrigerant / GWP R134a / 1430
Refrigerant charge 360 g / 12.5 oz
High / low pressure 390 / 75 psig
Temperature range -40˚F - 131˚F
Air volume flow (system / unimpeded) Ambient: 440 / 520 cfm
Enclosure: 360 / 520 cfm
Mounting External
Housing Material Mild steel, powder coated
Dimension H x W x D 35 x 15.6 x 12 inch
Weight 104 lbs.
Voltage / Frequency 400/460 V - 50/60 Hz 2~
Nominal current 2.5 A
Starting current 11.3 A
Max. current 3.8 A
Nominal power 1.5 kW
Max. power 2.0 kW
Fuse 5 A (T)
Connection 5 pole terminal block for signals, 4 pole terminal block for
power
Ingress protection IP 56 / Type 12, 3, 3R, 4
Approvals CE, cURus, cULus

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7. Mounting
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.

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8. Mounting Principle
Do not use within the first 15 minutes after installation!
1 M6 bolts
2 M6 toothed washers
3 M6 Flat washers
4 Enclosure
5 Mounting gasket
6 Cooling unit

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9. Dimensions (H x W x D)

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10. Electrical connection
Door Switch
The unit can be switched on and of via a door contact switch. When delivered the door contact terminals are
bridged on the female connector. To connect the door contact switch remove the bridge and connect door
contact switch. The contact must be closed when the cabinet door is closed.
11. Wiring diagram

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12. Taking into operation
Attention!
The unit can be damaged by lack of lubricant. To ensure that the compressor is adequately lubricated the oil,
which has been displaced during transport, must be allowed to flow back into it. The unit must therefore be
allowed to stand for at least 30 min. before being connected to the mains and taken into operation.
The unit / system must be protected with a MCB Type D or K.
Upon connection the internal fan will start working. If the temperature inside the enclosure is higher than the
set value of the controller both the compressor and external air fan start working. Once the air inside the
enclosure reaches the set temperature the compressor and external fan will stop.
The unit is pre-set at 95°F, which is suitable for most of the electronic devices.

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13. Trouble shooting
Failure Condition Cause Solution
Unit
doesn't
cool
Internal fan does not work Power not connected. Verify power supply
Internal fan works, external fan
and compressor don't work
Enclosure temperature is below
setting temperature (St)
Verify values of parameter
"St"
Door switch contact is open Verify door switch
Controller doesn't work Replace controller
Internal fan works, external fan
and compressor don't work.
Display shows alternating OFF
and temperature
The sequence of the phases
inside the power supply
connector is incorrect
Change phases inside power
supply connector
Unit
doesn't
cool
External and internal fan work,
compressor does not work
Compressor motor electrical
failure
Have compressor replaced
by qualified service technician
Capacitor for compressor failed Replace capacitor
Compressor works, external fan
doesn't work
External fan needs to be
replaced Replace external fan
Enclosure
temperature
too hot
Compressor and fans (external
and internal) work all the time Cooling unit undersized Enclosure needs a cooling unit with with higher capacity
Compressor and external fan
work in alternating mode
(ON / OFF)
Thermal compressor protector
triggered
Verify if ambient temperature
is too high,clean condenser
Refrigerant leakage Contact dealer/service center
Excessive
condensate
Enclosure door open Ambient air gets into the
enclosure
Ensure door is closed, add
a door switch and connect
it to controller
Enclosure door closed
Enclosure IP protection class
is below IP54
Seal all openings of the
enclosure
Damaged or misplaced sealing
strip
Repair sealing strip
accordingly
14. Maintenance & Cleaning
Always switch power supply off before starting any maintenance on
the unit.
The cooling unit is generally maintenance free and can be operated without filters in most environments. For
units with filters these should be checked, cleaned and if necessary replaced on a regular basis. In addition the
unit should have regular functional tests (approx. every 2,000 hours depending on the grade of ambient
pollution).
Disposal.
The cooling unit contains R134a refrigerant and small quantities of lubricating oil. Replacement, repairs and
final disposal must be done according to the regulations of each country for these substances.

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15. Transport & Storage
Malfunction due to transport damage
On delivery the carton box containing the unit must be examined for signs of transport damage. Any transport
damage to the carton box could indicate that the unit itself has been damaged in transit which in the worst case
could mean that the unit will not function.
The unit can only be stored in locations which meet the following conditions:
temperature range: - 40°F to 158°F
Relative humidity (at 77°F): max. 95 %
Returning the unit
To avoid transport damage the unit should be returned in the original packing or in a packing case and must be
strapped to a pallet. If the unit cannot be returned in the original packing please ensure that:
A space of at least 30 mm. must be maintained at all points between the unit and the external packing.
The unit must be shipped in the same position as it was mounted.
The unit must be protected by shock resistant padding (hard foam corner pieces, strips or cardboard
corner pieces).
16. Parts supplied
1 x Enclosure air conditioner
1 x Instruction manual
1 x CE Conformity Declaration
1 x M8 lifting hook
1 x Mounting gasket
10 x M6 Bolts
10 x A6.4 Toothed Washers
10 x A6.4 Washers
1 x 5 pole terminal for signals
1 x 4 pole terminal for power