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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SAGINAW CONTROL & ENGINEERING • A/C USER MANUAL
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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.