SCE Enviro-Therm SCE-AC2550B120V User manual

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SAGINAW CONTROL & ENGINEERING • A/C USER MANUAL
1. User Manual ............................................................................................ p. 2
2. Legal Regulations................................................................................... p. 2
3. Safety Instructions ................................................................................. p. 3
4. Functional Principle ............................................................................... p. 4
5. Technical Data......................................................................................... p. 5
6. Performance Graph ................................................................................ p. 6
7. Mounting.................................................................................................. p. 7
8. Mounting Principle ................................................................................. p. 7
9. Cutout Dimensions................................................................................. p. 8
10. Dimensions (H x W x D) ......................................................................... p. 8
11. Electrical Connection ............................................................................. p. 9
12. Controller Programming ........................................................................ p. 9
13. Wiring Diagram ....................................................................................... p. 13
14. Taking Into Operation ............................................................................. p. 15
15. Repair....................................................................................................... p. 15
16. Maintenance & Cleaning ........................................................................ p. 16
17. Transport & Storage ............................................................................... p. 16
18. Parts Supplied......................................................................................... p. 16
19. Warranty / Limits of Liability ................................................................. p. 17
User Manual SCE-AC2550B120V, SCE-AC2550B120VSS & SCE-AC2550B120VSS6

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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 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 specic 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:
• Disregarding the instruction manual
• Operation error
• Inappropriate work on or with the unit
• The use of non-specied spare parts and accessories
• Unauthorized modications or changes to the unit by the user or his personnel
Saginaw Control & Engineering 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 therefore it can be safely taken into operation. Only
trained specialists are allowed to work on the unit. Unauthorized personnel must be prohibited from working on the unit.
Operating personnel must inform their superiors immediately if any malfunction of the unit becomes apparent.
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 unauthorized cabinet reconnection
The electric equipment meets the valid safety regulations. One can nd dangerous voltage (above 50V AC or above 100V
DC):
• Behind the control cabinet doors
• On the power supply in the unit housing
The units have to be fused according to the type plate and the wiring diagram. Switch the unit o immediately if the electric
power supply is interrupted.
Danger Through Incorrect Work on the Unit
Only specialized personnel are allowed to maintain and clean the unit. Regular maintenance
and cleaning must be kept in order to ensure that the unit remains in perfect working condition
and has a long working life.
Danger from Electric Voltage
Only specialized 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 unauthorized disposal. All spare parts and associated
material must be disposed of according to the environmental laws.

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4. 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.
1. Air Intake, Cabinet Side
2. Radial Fan, Cabinet Side
3. Evaporator
4. Air Outlet, Cabinet Side
5. Compressor
6. Air Intake, Ambient Side
7. Radial Fan, Ambient Side
8. Condenser
9. Air Outlet, Ambient Side
10. Filter Dryer
11. Expansion Valve

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5. Technical Data
Part Numbers SCE-AC2550B120V
SCE-AC2550B120VSS
SCE-AC2550B120VSS6
Cooling Capacity @ 95°F / 95°F 2550 BTU (747 Watts)
Cooling Capacity @ 131°F / 131°F 2788 BTU (817 Watts)
Heating Capacity 400 W
Compressor Reciprocating Compressor
Refrigerant R134a
Refrigerant Charge 8.29 oz
Max. Pressure 457 psig
Operating Temperature Range -4°F - 131°F
Max. Air Volume Flow Ambient Air Circuit: 185 cfm
Cabinet Air Circuit: 97 cfm
Mounting External
Housing Material Mild Steel, Powder Coated
SS: Stainless Steel AISI 304
SS6: Stainless Steel AISI 316
Dimensions (H x W x D) 32.68 x 12.00 x 10.63 inch
Weight 71.5 lbs
Cutout Dimensions 10.43 x 7.09 inch
10.43 x 6.30 inch
Rated Operating Voltage / Frequency 120 V - 50/60 Hz
Rated Current @ 95°F / 95°F 7.4 A
Starting Current 22 A
Max. Current 7.4 A
Power Consumption @ 95°F / 95°F 540 W
Max. Power Consumption 860 W
Fuse Rating 16A (T) - Time Delayed [Slow Acting]
SCCR 5kA
Transformer Inrush 120A 0.01 Sec. on 120V & 460V Unit Class CC fuse / Class C Breaker Not Recommended
Circuit Breaker - MCB Type D or K Slow Acting 16A Slow Acting
Connection Connection Terminal Block
NEMA Protection Class NEMA 3, 3R, 4 & 12
SS: NEMA 3, 3R, 4, 4X & 12
Approvals CE / cURus / UL Listed
Industry Standards IS19
SS: IS20
Sound Level at 1.5 meters 65 db(A)
Max Voltage at Door Switch 5 A DC

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6. Performance Graph
Enviro-Therm®Air Conditioners 2550 BTU/HR (747 Watts)
Performance Curve
Ambient Temperature (°C)
Cooling Capacity
(BTU)
SCE-AC2550B230V, SCE-AC2550B120V, SCE-AC2550B460V
SCE-AC2550B230VSS, SCE-AC2550B120VSS, SCE-AC2550B460VSS
SCE-AC2550B230VSS6, SCE-AC2550B120VSS6, SCE-AC2550B460VSS6
Enclosure Air Temp
131°F/55°C 122°F/50°C 95°F/35°C 68°F/20°C
Cooling Capacity
(Watt)
Ambient Temperature (°F)
65 75 85 95 105 115 125 135
18 24 29 35 41 46 52 57
5000
4000
3000
2000
1000
0
1465
1172
879
586
293
0

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7. Mounting
Always disconnect the power supply before opening the unit.
Heat load to be dissipated from enclosure should not exceed specic cooling output of the unit at any condition. When
selecting a cooling unit, always allow 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 ows of air leaving and entering the cooling unit, internal and external, are not obstructed. Cooling unit enclosure
air suction hole must be installed at the highest possible point. When installing the unit on a door ensure it can take the
weight.
Before drilling the enclosure, ensure the xing 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 a󰀨ected by storage conditions,
please check this template by verifying values of the largest dimensions before drilling. Fit the sealing strip to the cooling
unit on the side connected to the enclosure and follow the installation diagram.
8. Mounting Principle
1. M6 Bolts
2. M6 Toothed Washers
3. M6 Flat Washers
4. Enclosure
5. Mounting Gasket
6. Cooling Unit

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9. Cutout Dimensions
32.70
10.70
12.00 4° SLOPE
12.00
32.70
13.80
9.25
7.87
.79
.98
10.43
1.26
7.09
1.97
6.30
16.09
.312
(x8)
.47
MOUNTING PATTERN
INTERNAL AIR
OUTLET
INTERNAL AIR
INLET &
ELECTRICAL
CONNECTIONS
10. Dimensions (H x W x D)

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11. Electrical Connection
The cooling unit is used where heat needs to be dissipated from electrical control cabinets or similar enclosures in order to
protect heat sensitive components. 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. Control cabinet air conditioners can
dissipate large quantities of heat from sealed enclosures, such as control cabinets, into the ambient air and at the same time
reduce the cabinet internal temperature to below that of the ambient air.
The control cabinet air conditioner can function without problems in extreme ambient conditions (e.g. dusty and oily air)
with a standard operating temperature ranging between -4°F and 131°F. The stated cooling capacities are according to DIN
3168.
Door Switch
The unit can be switched on and o󰀨 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.
12. Controller Programming
SET
TEST
BMS PRG
R
D
!
1
2
3
4
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) with a standard operating temperature ranging between +10°C and
+55°C. Units can be ordered with an additional electrical cabinet heater. For the
cooling capacities and environmental ratings please refer to the type plate data.
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.
Controller

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The operating parameters can be modied using the front keypad. Access di󰀨ers
depending on the type of parameter. Access to conguration parameters is protected
by a password that prevents unwanted modications or access by unauthorised persons.
Display icons
Programming
Icon Function Description
1
2
3
4
Compressor relay active
Alarm relay active
Heater relay active
Ambient blower relay active
Alarm
Heating mode
Cooling mode in progress
Flashes when activation is delayed or inhibited
by protection times, external disabling, or other
procedures in progress
Flashes when alarms are active
Signals operation of unit in heating mode
Activated only by manual procedure
Setting cooling set point, St1:
Setting heating set point, St2 (only for units supplied with internal heater):
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.
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.

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Setting temperature units (°C / °F), low temperature alarm and high temperature alarm:
1. Press “PRG” button for 5 seconds to reach the modiable 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.
Test Function
Di󰀨erent 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

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Alarm Relay Function
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.
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 ashes.
Typical alarm codes:
Error Code Description
E01 Probe B1 fault
E02 Probe B2 fault
E04 High temperature alarm
E05 Low temperature alarm
• Whilst programming, if no button is pressed for 10 seconds, the display starts ashing, and after 1
minute returns to the main display without saving changes.
• l To increase scrolling speed, press and hold the ▲ or ▼ button for at least 5 seconds.
• When pressing “PRG” for 3 seconds, the rmware revision code is displayed for 2 seconds.
• When cleaning the controller panel, do not use ethanol, hydrocarbons, ammonia or their byproducts.
Use neutral detergents and water.
• In order to protect the unit’s components, minimum relay output on (3 or 7 minutes) and o󰀨 (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 congured, probes not tted or congured, or St2 not enabled on the
controller the display shows ‘nO’.
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
13 14 15
13 14 15
13 14 15
13 14 15
SET
TEST
BMS PRG
!
SET
TEST
BMS PRG
!
2
SET
TEST
BMS PRG
!
SET
TEST
BMS PRG
!
Important Notes

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13. Wiring Diagram
Mc Compressor
Ma Ambient Fan
Mi Internal Fan
Cc Compressor Capacitor
Ca Ambient Fan Capacitor
Ci Internal Fan Capacitor
IH Internal Heater
TS Temperature Sensor
CE Condensate Evaporator
CH Compressor Heater
C Controller
AR Alarm Relay
X3 Transformer Connector
X4 Electrical Supply Connections
1 L1 - 120V
2 —
3 L2/N - 120V
4 Earth/Ground
5 P1 High Temp alarm NO
6 P2 High Temp alarm COM
7 P3 High Temp alarm NC
8 T1 Door Switch Contact
9 T2 Door Switch Contact
Notes:
#1 Ci not used SCE-AC2550B120V/SS
#2 X6 is plugged into X5 for units with heater
#3 Ma1 + Ca1 not used in SCE-AC2550B120V/SS

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14. 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 ow back into it. The unit must therefore be allowed to stand for at
least 30 minutes before being connected to the mains and taken into operation. 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.
If Drainage required, use PVC 10mm (3/8 inch) ID Hose.
15. Repair
Failure Condition Cause Solution
Unit Does
Not Cool
Internal fan does not work Power not connected. Verify power supply
Internal fan works, external fan
and compressor do not work
Enclosure temperature is
below setting temperature (St) Verify values of parameter "St"
Door switch contact is open Verify door switch
Controller does not work Replace controller
Internal fan works, external
fan and compressor do not
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
External and internal fan work,
compressor does not work
Compressor motor electrical
failure
Verify external fan, verify
ambient temperature, clean
condenser
Capacitor for compressor failed Replace capacitor
Compressor works, external
fan does not work
External fan needs to be
replaced Replace external fan
Enclosure
Overheating
Compressor and fans (external
and internal) work all the time Unit cooling undersized Enclosure needs a bigger cooling unit
Enclosure needs a bigger
cooling unit
Thermal compressor protector
triggered
Verify ambient temperature,
clean condenser
Refrigerant leakage Contact dealer/service center
Excessive
Condensate
Door enclosure open Ambient air gets into the
enclosure
Ensure door is closed, add a
door switch and connect it to
controller
Door enclosure closed
Enclosure IP degree minimum
IP54 Seal openings on enclosure
Damaged/misplaced sealing
strip Repair strip accordingly

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17. Transportation & Storage
During transport and storage the cooling unit must be kept in the position marked on the box and at a temperature between
-40˚F and 158˚F and a relative humidity of max. 95% (at 77°F). Check that the packaging has not been damaged during
transport.
18. Parts Supplied
1 x Air Conditioner
1 x Instruction Manual with technical information
1 x Mounting Template in 1:1 scale
1 x Installation pack containing:
8 x M6 Bolts
8 x A6.4 Toothed Washers
8 x A6.4 Washers
1 x Female Connector with shorted wired positions for door contact
Saginaw Control and Engineering
95 Midland Road
Saginaw, MI 48638-5770
Phone: [phone]
Fax: [phone]
[email protected]
16. Maintenance & Cleaning
Always switch power supply o before starting any maintenance on the unit.
Any repairs that may be needed must only be done by qualied personnel. The cooling unit is a low maintenance type and
for most environments, no lter is required. If an air lter is installed, check it periodically for dirt and clogs. Clean or replace
lter when necessary.
Disposal
The cooling unit contains R134a refrigerant and small quantities of lubricating oil. Replacement, repairs and nal disposal
must be done according to the regulations of each country for these substances.

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19. Warranty / Limits of Liability
All goods manufactured by SCE shall be warranted to be free of defects in material or workmanship for a period of two years
from the date of shipment. Should the product be proven to SCE to be defective, we shall option to repair or replace the
product. At no time will SCE reimburse purchaser for unauthorized rework on any product.
Air Conditioners & Heat Exchangers are warranted on parts and service for a period of two years from the date of shipment
by Saginaw Control and subject to the following conditions and exclusions:
All Goods must be installed and operated according to the following specications: Maximum voltage variation no
greater than plus or minus 10% of nominal rating; Maximum frequency variation no greater than plus or minus 3
Hz. from nominal rating; Must not exceed minimum and maximum rated temperatures; Must not exceed (BTU/Hr)
rating; Filters must be cleaned regularly; Must be installed and grounded in accordance with all relevant electrical
and safety codes, as well as the National Electric Code and OSHA rules and regulations; Must be installed in a
stationery application, free of vibration.
Our warranty does not warranty product that has been modied, subjected to abuse, negligence in operation or
maintenance, or if product is used in a manner that exceeds its designed capabilities and rating.
Warranty related claims will be returned to the factory for evaluation and nal disposition of the claim, any replacement parts
will be invoiced at standard pricing and credit issued for the returned product. If the product has been found to have been
modied, subjected to abuse, negligence in operation or maintenance, or if product has been used in a manner that exceeds
its designed capabilities and rating, credit may be reduced, denied or additional cost may be assessed and passed on to the
purchaser, such as return freight.