How to Install- Universal Series: Unit Installation

Before starting, ensure you’ve reviewed the Preparation and Setup section of this installation guide:

Installation of Condensate Pipe

1. Start with the right pitch! The condensate drain side should be pitched lower than the opposite side to ensure smooth drainage—check the figure below for a visual guide!

2. Remove the rubber plug! When the unit is shipped from the factory, both condensate outlets are sealed with a rubber plug—don’t forget to remove it before starting installation.

3. Drainage setup: Attach a PVC pipe to the drain pan, and make sure the termination follows local or state Plumbing/HVAC codes for proper compliance.

4. Keep that incline! Install the condensate pipe with a slight inclining angle of 5-10° to ensure the condensate flows freely and efficiently.

5. Backwater elbow required! Since the unit operates in a negative pressure environment, you’ll need to install a backwater elbow with a measurement of A = B ≥ P / 0.4in + 0.8in (A = B ≥ P / 10mm + 20mm).

6. Know your pressure! P is the absolute pressure inside the unit, measured in pascals (Pa)—keep that in mind for accurate installation.

7. Test the system! Once the electrical installation is complete, test the drainage system to ensure everything flows smoothly and correctly.

8. Avoid problematic connections! Never connect the condensate drain pipe to waste pipes or other lines that could carry corrosive substances or unpleasant smells—this could lead to unpleasant odors indoors or damage to the unit.

9. No rain pipes allowed! Do not connect the condensate drain to a rain pipe, as this could allow rainwater to enter, causing potential damage or safety hazards.

10. Dedicated drainage system: Always connect the condensate drain pipe to a dedicated drain system designed specifically for the unit to ensure proper operation and avoid any issues.

Dip Switch Instruction
The unit offers flexibility in controlling it via a wired controller or a thermostat, but only one can be connected at a time.

• When the dip switch SA1 is set to 0000, the wired controller takes priority, and its operation commands will control the unit.

• When the dip switch SA1 is not set to 0000, the thermostat operation commands are valid, and centralized controllers are not supported for this configuration.

By default, the unit comes equipped with a wired controller, and the dip switch SA1 is set to 0000 right out of the box.

If you need to replace the thermostat, make sure to adjust the dip switch SA1 according to the desired speed while the air conditioner is powered off to ensure proper operation.

Easy to adjust, and even easier to control—just make sure the settings are right for your needs!

Fan Speed Adjustment Guidance
When the unit is connected to a wired controller (with dip switch SA1 set to 0000), you have the flexibility to adjust the fan speed based on the static pressure levels.

The fan speeds for various static pressure levels are as follows:
(You can now list the specific fan speeds corresponding to each pressure level!)

This allows you to fine-tune the airflow to suit your specific environment, providing the ideal balance between performance and efficiency. Adjust and optimize for maximum comfort!

Out of the box, the unit comes with a default static pressure level of 05. However, you can easily adjust the static pressure levels to meet your specific needs.

To adjust the static pressure level:

1. Turn off the unit first.

2. Press and hold both the “FUNCTION” and “TIMER” buttons at the same time for 5 seconds to enter the system debugging function.

3. Once in the debugging mode, press the “MODE” button to adjust the static pressure level. The center of the wired controller display will show 11.

4. Now, use the ▲ or ▼ buttons to scroll through different static pressure levels. You’ll see numbers like 01, 02, 03, 04, 05, 06, 07, 08, 09 on the lower-right corner of the display interface.

5. Select the appropriate static pressure level based on the required fan speed. Once you've made your selection, confirm the setting by pressing the “SWING/ENTER” button.

When the unit is connected to a thermostat (and dip switch SA1 is not set to 0000), the fan speed is controlled by different dip switch settings. Each combination of settings corresponds to a different fan speed. Here’s the relationship between dip switch combinations and the speeds:

(You can now list the specific dip switch settings and the corresponding fan speeds!)

By adjusting these settings, you can tailor the unit’s airflow to your exact needs for optimal comfort and performance!

NOTE: 0 means dip switch to ‘on’, 1 means dip switch equals number.

Fan Performance Data
To ensure optimal performance during cooling, heating, and electric heating operations, it's crucial to keep the external static pressure within the specified minimum and maximum limits. Refer to the table below for the exact values to guarantee smooth and efficient operation!

Note:

1) “ / “ denotes that the static pressure is out of range. Air volume drop may affect the performance and reliability.
2) “ - “ denotes that the air volume is out of range, may lead to overload, and cause unstable operation of the fan motor.

Ductwork Installation Guidelines

1. Follow Standards and Codes:
   All field ductwork must comply with the National Fire Protection Association (NFPA) standards, including NFPA 90A, NFPA 90B, and any local ordinances applicable to your area.

2. Insulation & Vapor Barrier Requirements:
   Sheet metal ductwork in unconditioned spaces must be insulated and covered with a vapor barrier. If using fibrous ductwork, ensure it is constructed and installed according to SMACNA Construction Standards on Fibrous Glass Ducts. Ductwork must also meet the National Fire Protection Association standards and be UL Standard 181-tested for Class I Air Ducts. Always check your local codes for specific requirements on ductwork and insulation.

3. Design for Proper Pressure & Airflow:
   Your duct system must be designed to operate within the external static pressure range the unit is designed to handle. Ensure adequate system airflow by factoring in supply and return ducts, grills, special filters, accessories, and any other components that affect total resistance. For detailed fan performance data, refer to the corresponding section in this manual.

4. Complete Ductwork Before Operation:
   Never operate the unit without completing all ductwork. It’s essential that everything is fully set up to ensure proper performance.

5. Ensure All Ductwork is Attached:
   The unit should not be operated without all ductwork properly attached. This ensures safe and efficient operation.

6. Prevent Airflow Restrictions:
   Inadequate or improperly designed ductwork can severely impact performance and even lead to compressor or heater failure. Construct your ducts in a way that limits restrictions and maintains adequate air velocity. Also, make sure the ducts are properly sealed to prevent any leaks, which could compromise the system’s performance.

7. Return Ductwork Placement:
   Never terminate return ductwork in areas where toxic fumes or objectionable odors could be introduced into the system. The return duct should be connected to the air handler’s bottom (for upflow configuration).

8. Return Air Filters:
   Every installation must include a return air filter. This filtration can either be placed at the air handler or externally, such as in a return air filter grille, depending on the system setup.

Electric Heater Safety: 

While the unit doesn't come with a factory-installed electric heating function, you can easily add the electric heat as an accessory! Simply follow the detailed installation instructions included with the heat kit to get everything up and running in no time! 

Warning:

1. Important! For proper installation, be sure to consult the "Electric Heat Kit Installation" section in this manual and follow the instructions provided with the heat kit carefully.

2. Compatibility is Key! Ensure that the electrical characteristics of the unit, electric heat kit, and supply power match perfectly. Only the heat kits listed below are compatible—don’t use any other electric heat kits!

3. Installation Tip: Pay close attention to the switch order of the electric heating and indoor fan during setup. Always turn the fan on before activating the electric heating, and make sure to turn off the indoor fan after the heating is powered down to avoid potential malfunctions.

4. Fan Performance Alert: For optimal performance, refer to the “Fan Performance Data” section on page 13 of this manual. Failure to do so could result in irregular electric heating and increase the risk of dry burning.

5. Safety First: Maintain at least 5 feet of clearance between the electric heating and the supply air duct, and ensure it’s at least 1 foot away from any combustible materials or walls.

Installation Steps:

1. Choose the Right Kit: Check the table for the correct heat kit to ensure you're using the right one for your setup.

2. Inspect for Damage: Before installation, thoroughly check the heat kit for any physical damage. Never install a damaged kit—it’s crucial for safety and performance!

3. Access Panel Removal: Remove the access panel from the unit to begin the installation process.

4. Cover Plate Removal: Take off the cover plate from the unit to gain full access for the heat kit installation.

5. Insert and Secure: Slide the heater kit into its designated slot, then secure the element plate using the screws you removed earlier.

6. Power Connection: Insert the power leads into the circuit breaker lugs—make sure everything is properly connected!

7. Grounding Safety: Attach the ground wire securely to the ground lug to ensure safe operation.

8. Knockout Step: Knock out the hole in the stand column if necessary. Important: If a circuit breaker isn't being installed, do not knock out the holes, as this could affect the unit's performance and reliability.

9. Final Check: Once everything is in place, replace the access panel and check the operation to make sure everything is working smoothly.

10. Power Cords & Reserve Lines: Connect the power cords and reserve lines to complete the installation and ensure proper functionality.

Electrical Installation Requirements:

1. Professional Installation Only: To ensure safety, the electrical installation must be carried out by qualified professionals in compliance with local laws, regulations, and the instructions provided in this manual. The electric circuit must include both a circuit breaker and an air switch, all with the appropriate capacity for the unit.

2. Power within Range: The unit's operating power must fall within the nominal range specified in the instruction manual. Always use a dedicated power circuit for the air conditioner—do not share power with other circuits.

3. Safety Distance: Keep the air conditioner circuit at least 1.5 meters away from any flammable surfaces to reduce the risk of fire hazards.

4. Secure Wiring: Ensure that external power cords, wired controller wires (or thermostat wires), and the unit are securely fixed in place for safe operation.

5. Avoid Hot Objects: Never allow external power cords, controller wires, or the unit to come into contact with hot surfaces such as chimney pipes, gas pipes, or other sources of heat.

6. No Pressure on Wires: Keep the external power cords and wires free from squeezing, pulling, stretching, or bending to avoid damage. Proper wire management is crucial!

7. Avoid Sharp Edges: Be careful to prevent external power cords, controller wires, or the unit from coming into contact with metal beams, sharp metal edges, or any other potentially damaging surfaces.

8. Follow the Circuit Diagram: Always connect the wires according to the circuit diagram shown on the unit or electric box. Make sure all screws are tightly secured, and replace any loose screws with specialized flat-head screws.

9. Firm Connections Only: Wiring terminals should be securely connected to the terminal board. Never allow loose connections as they can pose a safety risk.

10. Proper Wire Gauge: Use power cords with the correct wire gauge. If any wires are damaged, replace them with specialized, certified wires. Always follow national wiring codes and regulations to ensure safety.

11. Heating Four-Way Valve: Keep in mind that the unit includes a heating four-way valve, which requires careful consideration during installation.

Terminal Connections:

For Solid Wires:

1. Cut and Peel: Use wire cutters to trim the wire end and carefully peel away about 1 inch (25mm) of the insulation layer to expose the wire.

2. Unscrew the Terminal: Use a screwdriver to unscrew the terminal screw on the terminal board.

3. Bend the Wire: Use pliers to bend the solid wire into a ring that fits neatly around the terminal screw.

4. Attach and Tighten: Form the ring properly and attach it securely to the terminal board. Then, use the screwdriver to tighten the terminal screw firmly.

For Strand Wires:

1. Cut and Peel: Use wire cutters to cut the wire end and peel away about 0.5 inch (10mm) of the insulation to expose the strands.

2. Unscrew the Terminal: Use a screwdriver to unscrew the terminal screw on the terminal board.

3. Attach the Round Terminal: Use a round terminal fastener or clamp to firmly attach the round terminal to the exposed wire end.

4. Secure the Terminal: Position the round terminal onto the terminal conduit and use a screwdriver to tighten the terminal screw securely. (See Fig. 7.2 for reference.)

Connecting the Wired Controller Wires (or Thermostat Wires) and Power Cords:

1. Prepare the Wires: Carefully lead the wired controller wires (or thermostat wires) and power cords through the insulation tube, as shown in the figure below.

2. Ensure Secure Routing: Make sure the wires are positioned neatly and securely within the insulation tube to prevent damage and ensure a safe connection.

• Short-Circuit Precaution: If the unit has been short-circuited and you need to connect the emergency stop switch, be sure to first remove the corresponding short-circuit wire for safety.

• Thermostat or Controller Only: The unit is designed to be connected solely to a thermostat or a wired controller—do not connect any other devices to ensure proper operation and safety.

• Y: Compressor control signal – This controls the operation of the compressor.

• B: Energized in heating mode – Activates the system during heating mode.

• O: 4-way valve control signal – Controls the 4-way valve for reversing the refrigeration cycle.

• W1: Heater control signal – Manages the operation of the heating element.

• R: 24V AC power supply – Provides the 24V AC power needed for operation.

• C: 24V common – Serves as the common return for the 24V circuit.

• G: Indoor side fan signal – Controls the operation of the indoor fan.

Without Electric Heater

With Electric Heater

Engineering Wiring Diagram

Post-Installation Check