This document describes the TADIRAN MINI-VRF DC Variable Frequency Outdoor Unit, an air conditioning system designed for comfort and efficiency. It covers installation, electrical wiring, and trial run procedures, emphasizing safety precautions and key construction inspection points.
Function Description:
The TADIRAN MINI-VRF DC Variable Frequency Outdoor Unit is a sophisticated air conditioning system designed to provide comfortable indoor environments. It utilizes DC variable frequency technology, which allows for precise control over the compressor speed, leading to improved energy efficiency and consistent temperature regulation. The system supports multiple indoor units, allowing for flexible climate control across different zones within a building. It is not intended for specialized environments such as machine rooms, precise instrument rooms, or spaces housing foods, plants, animals, or artworks, as it is primarily a comfort unit. The system incorporates a refrigerant distribution network that connects the outdoor unit to various indoor units, facilitating the circulation of refrigerant for heating and cooling operations.
Important Technical Specifications:
The manual provides detailed specifications for various aspects of the unit, including:
- Outdoor Unit Models:
- 08KW, 10KW (Dimensions: 694mm x 370mm x 994mm)
- 12.5KW, 14KW, 16KW, 18KW (Dimensions: 900mm x 400mm x 1328mm)
- Refrigerant Pipe Specifications:
- Diameter and Wall Thickness: Specific requirements for copper pipe diameter and wall thickness are mandated.
- Air Tightness Test: Requires nitrogen at 40kgf/cm² (4.0MPa) for 24 hours.
- Vacuumization: Must achieve -0.1MPa from both gas and liquid sides.
- Refilling Volume (R410A):
- Φ6.35mm liquid pipe: 0.023 kg/m
- Φ9.52mm liquid pipe: 0.040 kg/m
- Main Pipe (L1) Diameter (mm) based on Outdoor Unit Capacity:
- 8/10 kW:
- L1 < 30m: Liquid pipe Φ9.52, Gas pipe Φ15.88
- L1 ≥ 30m: Liquid pipe Φ9.52, Gas pipe Φ15.88
- First distributor: SP-FQG-N02A
- 12.5/14/16 kW:
- L1 < 30m: Liquid pipe Φ9.52, Gas pipe Φ15.88
- L1 ≥ 30m: Liquid pipe Φ9.52, Gas pipe Φ19.05
- First distributor: SP-FQG-N02A
- 18 kW:
- L1 < 30m: Liquid pipe Φ9.52, Gas pipe Φ19.05
- L1 ≥ 30m: Liquid pipe Φ9.52, Gas pipe Φ19.05
- First distributor: SP-FQG-N02A
- Main Pipe (L2-L5) Diameter (mm) based on Downstream Indoor Unit Capacity:
- W < 6.5 kW: Liquid pipe Φ9.52, Gas pipe Φ12.7 (Applicable distributor: SP-FQG-N01A)
- 6.5 ≤ W ≤ 16 kW: Liquid pipe Φ9.52, Gas pipe Φ15.88 (Applicable distributor: SP-FQG-N02A)
- 16 < W ≤ 18 kW: Liquid pipe Φ9.52, Gas pipe Φ19.05 (Applicable distributor: SP-FQG-N02A)
- Allowable Pipe Lengths and Height Differences:
- Total Pipe Length: ≤ 100m
- Length of Farthest Pipe L: Actual length < 60m, Equivalent length < 70m
- Equivalent Length to Farthest Pipe of First Distributor: ≤ 20m
- Equivalent Length to Nearest Distributor: ≤ 15m
- Height Difference (Indoor and Outdoor Units): Outdoor upper < 30m, Outdoor lower < 20m
- Height Difference (Indoor Units): < 8m
- Electrical Wiring:
- Single-phase 220-240V~50Hz: Power Line 3x4.0 mm², Breaker/Fuse 40/30 A
- Three-phase 380V~50Hz: Power Line 5x2.5 mm², Breaker/Fuse 25/20 A
- Single-phase 220-240V~50Hz: Power Line 3x6.0 mm², Breaker/Fuse 63/45 A
- Three-phase 380V~50Hz: Power Line 5x2.5 mm², Breaker/Fuse 25/20 A
* Signal Wire: Three-core shielded cable 3x1.0 mm² (or two-core shielded cable 2x1.0 mm²) for indoor/outdoor units.
- Thermal Insulation:
- Copper pipe < Φ12.7mm: Insulation thickness ≥ 15mm
- Copper pipe ≥ Φ15.88mm: Insulation thickness ≥ 20mm
- Flame retardant grade B1, high temperature resistance 120°C.
Usage Features:
- Installation Flexibility: The manual details two main connecting modes (Mode I and Mode II) for indoor units, allowing for various system configurations. It also provides guidelines for installing distributors (U-type or Y-type, installed horizontally with a deviation angle no greater than ±10°C, and with a straight pipe of no less than 0.8 meter).
- Oil Return Bend Settings: Specific instructions are given for positioning oil return bends in both height and horizontal directions to ensure proper oil circulation within the refrigerant system.
- Vacuumization Process: A step-by-step guide for vacuumizing the system, including requirements for the vacuum pump (degree < -0.1MPa, air displacement > 40L/min) and duration (at least 2 hours, 20-60 minutes after reaching -0.1MPa, and remaining vacuum for 1 hour).
- Refilling Refrigerant: Emphasizes calculating the refilling volume based on pipe length and diameter, and using an electronic scale for accurate R410A refilling in liquid state.
- Stop Valve Instructions: Clear guidance on operating stop valves, including opening/closing procedures with a 6mm socket head wrench and tightening the valve cover.
- Electrical Wiring Guidelines: Specifies separate power supplies for indoor and outdoor units, the need for current leakage protection and manual switches, and the use of shielded twisted-pair cables for communication to reduce interference. It also highlights the importance of adhering to national electrical standards and having a professional electrician perform the wiring.
- Centralized Control Option: The system supports an optional centralized controller (CCM) for enhanced management, with instructions to contact the local supplier for installation details.
- Spot-check Instructions: Provides a table (Table 5-4) for various spot-check contents, including current frequency, capacity, operation mode, fan gears, temperatures (T2, T3, T4, T5), and fault codes, aiding in system diagnosis and monitoring.
- Fault Code Definitions: A comprehensive list of fault codes (E1, E2, E4, E6, E9, E10, H0, H1, H4-H7, H9-H11, P1-P6, P9-P13, L0-L2, L4, L5, L7-L9) with their corresponding fault contents and remarks, facilitating troubleshooting.
Maintenance Features:
- Construction Inspection: Before installation, a thorough inspection of goods for transportation damage, verification of type, specification, and quantity, and checking for all accessories is required.
- Refrigerant Pipe Treatment: Emphasizes nitrogen-filled protection during copper pipe welding to prevent internal oxidation and thermal insulation for all refrigerant pipes.
- Air Tightness Test: A critical step after pipe installation to detect leaks, requiring a 24-hour test with nitrogen.
- Removal of Foreign Materials: Instructions to clean refrigerant pipes with high-pressure nitrogen to prevent system blockage.
- Trial Run Preparations: Before the trial run, a series of checks are necessary, including verifying refrigerant pipeline and communication line connections, power supply voltage, correct electrical wiring, absence of short circuits, successful 24-hour nitrogen pressure-maintaining test, full vacuumization, and proper refrigerant filling.
- Compressor Oil Heating: The outdoor unit must be powered on for more than 12 hours before the trial run to allow the heater to warm the compressor oil, preventing potential damage.
- Valve Operation: All air pipe check valves, liquid pipe check valves, and oil balance valves of the outdoor unit must be fully opened before operation.
- Phase Sequence Check: Verification of the power supply phase sequence of the outdoor unit is crucial.
- Dialing Switch Settings: All dialing switches of indoor and outdoor units must be set according to product technical requirements.
- Refrigerant Leak Precautions: Guidelines for ensuring the room size is appropriate to prevent refrigerant concentration from exceeding critical levels (0.3 kg/m³) in case of a leak. Measures include installing mechanical ventilation devices or leak warning devices interlinked with ventilation.
- Documentation Handover: The installation manual and user manual are to be handed over to the client, with careful explanation of their contents.
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