Saginaw Enviro-Therm NEXTGEN SCE-NG5290B230V A/C User Manual

Table of Contents

1. User Manual
2. Legal Regulations
3. Safety Instructions
4. Settings
5. Functional Principle
6. Technical Data
7. Mounting
8. Mounting Principle
9. Cutout Dimensions
10. Dimensions (H x W x D)
11. Electrical Connection
12. Wiring Diagram
13. Modbus Connection
14. Taking Into Operation
15. Troubleshooting
16. Maintenance & Cleaning
17. Transportation & Storage
18. Parts Supplied
19. Warranty / Limits of Liability

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 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.

Safety Pictograms

• ⚠️ General Danger: Indicates compulsory safety regulations which are not covered by a specific pictogram.
• ⚡ High Electric Voltage: Indicates electric shock danger.
• ℹ️ Important Safety Instruction: Indicates instructions for safe maintenance and operation of the unit.
• ? Attention (Heat): Indicates possible burns from hot components.
• ⚠️ Attention (Damage): Indicates possible damage to the unit.
• ? Instruction (Environment): 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. Saginaw Control & Engineering reserves 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-specified spare parts and accessories
• Unauthorized modifications 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.

3. Safety Instructions

Upon delivery, the unit is already meeting current technical standards and 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.

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 instructions 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. Dangerous voltage (above 50V AC or above 100V DC) can be found:

• 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 off immediately if the electric power supply is interrupted.

Specific Dangers

• ⚠️ Danger Through Incorrect Work on the Unit: Only specialized personnel are allowed to maintain and clean the unit. Regular maintenance and cleaning are essential for the unit's perfect working condition and long working life.
• ⚡ Danger from Electric Voltage: Only specialized personnel are allowed to maintain and clean the unit. Ensure the unit is disconnected from the electrical supply during maintenance and cleaning.
• ⚠️ Attention: Damage to the unit through the use of inappropriate cleaning materials. Do not use aggressive cleaning materials.
• ? Instruction: Damage to the environment through unauthorized disposal. All spare parts and associated material must be disposed of according to environmental laws.

4. Settings

The cooling unit is intended as a complementary accessory to larger industrial equipment, dissipating heat from electrical control cabinets or similar enclosures to protect temperature-sensitive components. It is not intended for household use. The unit features two separate air circuits, ensuring clean cabinet air does not mix with ambient air, which may be dirty or polluted. These units can dissipate significant heat from sealed enclosures into the ambient air, reducing the cabinet's internal temperature below ambient.

The unit functions reliably in extreme ambient conditions (e.g., dusty and oily air) with a standard operating temperature range of +10°C to +55°C. Units can be ordered with an additional electrical cabinet heater. Cooling capacities and environmental ratings are detailed on the type plate.

Controller Description

A digital controller display shows temperature readings. The display range is -50°C to +150°C (-58°F to +302°F), with a resolution of tenths between -19.9°C and +99.9°C (-3.8°F to +211.8°F). During programming, it shows parameter codes and values. Icons indicate occurring events.

The controller features navigation buttons (PRG, SET, ▲, ▼) and numbered buttons (1, 2, 3, 4).

Display Icons

Programming

Operating parameters can be modified using the front keypad. Access differs by parameter type. Configuration parameters are protected by a password to prevent unauthorized modifications.

Setting Cooling Set Point (St1)

1. Press “SET”; the display shows St1 and its pre-set value (default: +35°C / +95°F).
2. Use ▲ or ▼ to reach the desired value.
3. Press “SET” again to save the new value of St1.

Setting Heating Set Point (St2) (for units with internal heater)

1. Press “SET” twice slowly; the display shows St2 and its pre-set value (default: +5°C / +41°F).
2. Use ▲ or ▼ to reach the desired value.
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” for 5 seconds to access the modifiable parameter list.
2. Use ▲ or ▼ to navigate to 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 its 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 for other parameters.
7. Press “PRG” for 5 seconds to permanently save the new values.

5. Functional Principle

The cooling unit operates on a refrigeration circuit comprising a compressor, evaporator, condenser, and expansion device. The hermetically sealed circuit circulates R134a refrigerant (chlorine-free, ODP of 0, GWP of 1430). The compressor increases the refrigerant's pressure and temperature, pushing it through the condenser where ambient air cools it, converting it from gas to liquid. The liquid refrigerant then passes through a capillary pipe to the evaporator at lower pressure, absorbing heat to change from liquid to gas. The gas returns to the compressor, completing the cycle.

Refrigeration Circuit Components:

• 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

Diagram Description: A schematic illustrates the refrigeration circuit. Arrows show airflow into and out of the unit on both the cabinet and ambient sides, driven by fans (2, 7). The compressor (5) circulates refrigerant through the condenser (8), expansion valve (11), and evaporator (3). The filter dryer (10) is positioned before the expansion valve. Numbered labels correspond to the component list above.

6. Technical Data

7. Mounting

⚠️ Power Supply Warning: The power supply rating on the unit rating plate must comply with mains rating. Always disconnect the power supply before opening the unit.

The heat load to be dissipated from the enclosure should not exceed the unit's specific cooling output under any condition. When selecting a cooling unit, 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 airflow is not obstructed. The air outlet should not blow air directly at an equipment operator; a barrier or duct may be needed to redirect airflow.

The cooling unit's enclosure air suction hole must be installed at the highest possible point. When installing on a door, ensure the door can support the weight. Before drilling, check that fixing elements and couplings will not interfere with equipment inside the enclosure. Disconnect power before any work inside the enclosure.

Follow the Drilling Template to drill holes and make required cuts. Check the template for accuracy if affected by storage. Fit the sealing strip to the cooling unit on the side connected to the enclosure and follow the installation diagram.

If the unit is mounted in a recessed position, the controller bracket can be adjusted according to the enclosure's wall thickness.

Condensate Management:

High humidity and low temperatures can cause condensation on the evaporator. Condensate flowing back into the enclosure can damage sensitive electronics. The unit's integrated condensate evaporation releases condensate to the environment. If formation is excessive, condensate may drip into an overflow trough. To prevent excessive condensate:

• Check seals at regular intervals.
• Consider installing a door contact switch to prevent condensation when the enclosure door is left open.

Diagram Description: Two diagrams illustrate mounting steps. Diagram 1 shows a close-up of the unit's mounting points. Diagram 2 shows a hand adjusting a bracket for recessed mounting, indicating adjustment based on wall thickness.

8. Mounting Principle

Important Mounting Notes:

• Do not use the unit 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; reinforce if necessary.

Parts List:

1. M6 Screws
2. M6 Toothed Washers
3. M6 Flat Washers
4. Enclosure
5. Mounting Gasket
6. Lifting Hook
7. Cover
8. M4 Screws

Diagram Description: Two exploded view diagrams illustrate mounting principles. Fig. 1 shows a recessed installation, detailing how the unit attaches to the enclosure with screws, washers, and gasket. Fig. 2 shows an external installation with similar components. Labels indicate parts like the enclosure, cover, lifting hook, and screws.

9. Cutout Dimensions

Diagram Description: Two diagrams provide cutout dimensions for the enclosure. The left diagram is labeled 'CUTOUT FOR EXTERNAL INSTALLATION' and shows precise measurements for height, width, and placement of holes. The right diagram is labeled 'CUTOUT FOR INTERNAL INSTALLATION' and provides similar dimensional details.

10. Dimensions (H x W x D)

Diagram Description: Multiple views of the cooling unit are shown, including front, side, top, and rear perspectives. Overall dimensions are indicated, with the height being approximately 37.40 inches.

11. Electrical Connection

⚠️ Caution, risk of death: Unconnected and/or faulty protective conductor systems can lead to dangerous voltages and electric shocks. Work on electrical connections may only be carried out by trained electrical engineers.

Door Switch

The unit can be switched ON and OFF via a door contact switch. The door contact terminals are bridged on the female connector by default. To connect a door contact switch, remove the bridge and connect the switch. The contact must be closed when the cabinet door is closed.

The door switch logic can be changed (controller firmware rev. 1.2 or higher) by setting parameter c68:

• c68 = 0 (default): ON if closed - Door contact terminals bridged, or NC door switch connected (Contact must be closed when cabinet door is closed).
• c68 = 1: ON if open - Remove bridge, or NO door switch connected (Contact must be open when cabinet door is closed).

Alarm Contacts

Alarm contacts are rated according to:

• EN60730-1: 8(4)A N.O., 6(4) A N.C., 2(2) A N.O./ N.C. @ 250Vac, 100000 cycles
• UL 873: 8 A resistive 2FLA 12LRA, pilot duty C300 @ 250Vac, 30000 cycles

These contacts are not suitable for fluorescent loads using starters (ballasts) with phase shifting capacitors. Fluorescent lamps with electronic controllers or without phase shifting capacitors can be used within specified operating limits.

Strain Relief Function

To maintain UL listing approval, the supplied strain relief bracket and cable glands must be installed.

Connect Unit

Connect the cooling device according to the instructions. The cable cross-section must correspond to the required power for the current consumption, but max. 2.5 mm² / AWG 14.

Diagram Description: Illustrations show how to connect the unit. Connector A is for alarm and door switch signals, using a five-pole terminal block. Connector B is for power supply, using a four-pole terminal block. Diagrams also show the installation of M16 and M20 cable glands with lock nuts and a supply plate.

12. Wiring Diagram

Part List:

• Mc: Compressor
• Mi: Internal fan
• Ca: Ambient Fan Capacitor
• Hi: Internal heater
• Hcc: Heater, compressor crankcase (Optional)
• Si: Internal temperature sensor
• Ma: Ambient fan
• Cc: Compressor capacitor
• Ci: Internal capacitor
• Cis: Internal Slow-down Capacitor (Optional)
• Hce: Condensate evaporator heater
• Sa: Ambient temperature sensor (Option)
• A: RS495 – connection
• GND: GND connection
• B: RS485 - B connection

NOTES:

• Use copper conductors only.
• Use supply wires suitable for 75 °C (167 °F).
• Refer to the Unit typeplate for correct operating voltage and frequency.
• Suitable protective devices should be installed on the supply line.

ELECTRICAL SUPPLY CONNECTION (See unit typeplate for unit voltage)

• 230V - 1:L1 (230V), 3:N
• 115V - 1:L1(115V), 3:N
• 400V - 2:LX(400V), 3:L2(400V)
• 460V - 1:L1(460V), 3:L2(460V)

Power connector:

• 1 L1
• 2 /
• 3 N
• 4 PE

Signal connector:

• 1 Alarm (NC)
• 2 Alarm (COM)
• 3 Alarm (NO)
• 4 Door contact
• 5 Door contact

RS485 connector:

• 1 A
• 2 GND
• 3 B

Diagram Description: A detailed wiring schematic shows the interconnections between various components including the compressor (Mc), fans (Mi, Ma), heater (Hi), sensors (Si, Sa), capacitors (Cc, Ca, Cis), and power/signal connectors. It also illustrates the electrical supply connection options and the terminal assignments for power, signal, and RS485 connectors.

13. Modbus Connection

All Enviro-Therm® units are offered standard with a Modbus connection.

Diagram Description: Images display the Modbus connection ports on different Saginaw unit models (SCE-NG1195B / SCE-NG2320B, SCE-NG5100B / SCE-NG6800B, SCE-NG8500B / SCE-NG14300B, SCE-NG2970B / SCE-NG5290B). Each image highlights a three-pole Modbus connector labeled A, GRD, and B. A separate image shows the included Modbus connector.

14. Taking Into Operation

⚠️ Attention! The unit can be damaged by lack of lubricant. To ensure the compressor is adequately lubricated, the oil displaced during transport must first flow back into place. The unit must therefore stand for at least 30 minutes 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 will start working. The cooling cycle will stop once the air inside the enclosure reaches the set temperature minus hysteresis or once the minimum On-time is reached.

The hysteresis is 3K, the minimum ON-time is 4 minutes, and the minimum OFF-time is 3 minutes. For units with a cooling capacity of more than 1 kW, the minimum OFF-time is usually 7 minutes.

The setpoint for the internal enclosure temperature is pre-set at 95°F.

15. Troubleshooting

16. Maintenance & Cleaning

⚠️ Always switch power supply off before starting any maintenance on the unit. Wait for 5 minutes for electrical components to discharge.

The cooling unit is generally maintenance-free and can be operated without filters in most environments. If the ambient air is extremely dusty, filter mats (see accessories) are recommended; they should be cleaned or replaced at regular intervals. Oily or greasy filter mats should be replaced immediately. Do not use a steam jet or high pressure to clean filter mats, and do not wring them out. If the ambient air is extremely oily, metal filters (see accessories) are recommended; they can be cleaned with standard cleaning agents and reused. Regular functional tests (approx. every 2,000 hours) are advised, depending on ambient pollution.

Note: The use of filter mats/metal filters reduces the cooling capacity of the unit.

Disposal

The cooling unit contains R134a refrigerant and lubricating oil. Replacement, repairs, and final disposal must be done according to the regulations of each country for these substances.

17. Transportation & Storage

Malfunction due to transport damage

Upon delivery, examine the carton box for signs of transport damage. Any damage to the carton box could indicate that the unit itself has been damaged in transit, potentially rendering it non-functional.

Storage Conditions:

The unit can only be stored in locations meeting the following conditions:

• Temperature range: -40°F to 158°F
• Relative humidity (at 77°F): max. 95%
• The cooling unit should always be stored according to the installation position.

Returning the unit

To avoid transport damage, return the unit in its original packing or a suitable packing case, strapped to a pallet. If the original packing cannot be used, ensure that:

• A space of at least 30 mm is maintained between the unit and the external packing at all points.
• The unit is shipped in the same position as it was mounted.
• The unit is protected by shock-resistant padding (e.g., hard foam corner pieces, strips, or cardboard corner pieces).

18. Parts Supplied

Parts Supplied:

• Full version of instruction manual
• CE declaration of conformity
• 1:1 mounting template
• M6 * 16 bolts (x11)
• A6.4 toothed washers (x11)
• A6.4 washers (x11)
• Screw M4 * 12 (x2)
• 5 - pole terminal block for signals (x1)
• 4 - pole terminal block for electrical connection (x1)
• 3 - pole terminal block for RS 485 MODBUS (x1)
• Cable gland M16 * 1.5 (x1)
• Lock nut M16 * 1.5 (x1)
• Cable gland M20 * 1.5 (x1)
• Lock nut M20 * 1.5 (x1)
• Supply Plate (x1)
• Drain fitting (x1)
• Foam tape (x1)

19. Warranty / Limits of Liability

All goods manufactured by Saginaw Control & Engineering (SCE) are warranted to be free of defects in material or workmanship for a period of two years from the date of shipment. Should a product be proven defective, SCE will repair or replace it at its option. SCE will not reimburse purchasers for unauthorized rework on any product.

Air Conditioners & Heat Exchangers are warranted on parts and service for two years from the date of shipment by Saginaw Control, subject to the following conditions and exclusions:

• All Goods must be installed and operated according to specifications: Maximum voltage variation ±10% of nominal rating; Maximum frequency variation ±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, National Electric Code, and OSHA rules and regulations; Must be installed in a stationary application, free of vibration.

The warranty does not cover products that have been modified, subjected to abuse, negligence in operation or maintenance, or used in a manner exceeding their designed capabilities and rating.

Warranty-related claims will be returned to the factory for evaluation. Replacement parts will be invoiced at standard pricing, with credit issued for returned products. If a product is found to have been modified, abused, or used improperly, credit may be reduced, denied, or additional costs (such as return freight) may be assessed.

Contact Information:

Saginaw Control and Engineering
95 Midland Road
Saginaw, MI 48638-5770
Phone: (989) 799-6871
Fax: (989) 799-4524
Email: sce@saginawcontrol.com