This document outlines the control system for a Full DC Inverter CHV System, providing detailed information on its outdoor unit PCB, dial codes, error codes, parameter settings, wiring installations, communication system, and remote controller functions.
Function Description
The Full DC Inverter CHV System is designed for heating and ventilation applications, utilizing a full DC inverter technology for efficient operation. The system's control is managed primarily through an outdoor unit PCB, which integrates various sensors, communication ports, and control outputs to regulate the system's performance. The system supports both master and slave outdoor unit configurations, allowing for scalable installations. Communication between outdoor units (ODUs) and indoor units (IDUs) is a critical aspect, ensuring coordinated operation. The system also features a remote controller for user interaction, offering various modes, temperature adjustments, fan speed control, and timer functions.
Important Technical Specifications
Outdoor Unit PCB (Page 3):
The outdoor unit PCB is the central control board, featuring numerous ports for different functionalities:
- Communication Ports: Module board communication port (1), Port for communication between ODUs (17), Port for IDU and ODU communication and IDU network wiring (10).
- Sensor Inputs: System high pressure (2), Ambient temperature (3), Condenser coil temperature (4), Primary side current of compressors (5), Low-pressure switch (6), High-pressure switch (7), Exhaust temperature sensor of compressor (11), Refrigerant cooling copper pipe temperature sensor (12), System low pressure (reserved) (13), Oil temperature sensor (reserved) (14), Outlet temperature sensor of plate heat exchanger (15).
- Control Outputs: DC fan (left fan and single fan use port 1) (8), Fan motor relay (18), EXV1 and EXV2 (19), EXV3 and EXV4 (20), Electric heater of compressor A (21), Electric heater of compressor A (22), Solenoid valves (23), 4-way valve (24), AC fan motor (25).
- Other Ports: Network control and ammeter billing (9), Power input port of main PCB (27), Program download (0547) (28), PassDog (29), GND (30), Program download (0537) (31).
Dial Codes (Pages 4-6):
- SW4 (Night Silent Operation):
- Meaning: Parameter setting for night time silent operation.
- Settings:
- Default: After 6 hours of daytime peak temperature, night time silent operation starts, lasts for 10 hours, then returns to normal operation.
- Option 1: After 8 hours of daytime peak temperature, night time silent operation starts, lasts for 10 hours, then returns to normal operation.
- Option 2: After 6 hours of daytime peak temperature, night time silent operation starts, lasts for 12 hours, then returns to normal operation.
- Option 3: After 8 hours of daytime peak temperature, night time silent operation starts, lasts for 12 hours, then returns to normal operation.
- Remarks: It is available only when the user turns on the night time silent operation mode in SW8. Night time silent operation mode is default ON.
- SW5 (Outdoor Fan ESP Setting):
- Meaning: Configures the external static pressure for the outdoor fan.
- Settings: Standard, Low, Middle, High, Super-high static pressure, Silence, High-silence, Ultra-silence.
- Default: Standard static pressure.
- SW6 (Outdoor Unit Address Setting):
- Meaning: Sets the address for the outdoor unit in a multi-unit system.
- Settings: Master unit (0), Slave unit 1 (1), Slave unit 2 (2), Slave unit 3 (3).
- Remarks: Only 0,1,2,3 is available; addresses greater than 3 will cause system failure.
- SW7 (System First Start Time & Snow-Blowing Function):
- Meaning: Controls initial startup delay and snow-blowing function.
- Settings:
- System start after 12 minutes, snow-blowing OFF (Default).
- System start after 7 minutes, snow-blowing OFF.
- System start after 12 minutes, snow-blowing ON.
- System start after 7 minutes, snow-blowing ON.
- Snow-blowing Function: When outdoor temperature is lower than 0°C and system is standby, outdoor fan motor turns on for 30 seconds every hour.
- Remarks: Do not change this setting without professional guidance.
- SW8 (Night Time Silent Operation Mode & Automatic Addressing):
- Meaning: Enables/disables night time silent operation and automatic addressing.
- Settings:
- Night time silent operation ON, automatically addressing ON (Default).
- Night time silent operation ON, automatically addressing OFF.
- Night time silent operation OFF, automatically addressing ON.
- Night time silent operation OFF, automatically addressing OFF.
- SW9 (Operation Mode Restriction Setting):
- Meaning: Restricts operation modes and sets VIP priority.
- Settings: Auto priority (Default), Heating priority, Cooling priority, Heating only, Cooling only, VIP priority and Auto priority.
- Remarks: Address No.63 indoor unit is VIP unit.
- SW11 (Outdoor Unit Capacity Setting):
- Meaning: Configures the capacity of the outdoor unit.
- Settings: 8HP (0), 10HP (1), 12HP (2), 14HP (3), 16HP (4), 18HP (5), 20HP (6), 22HP (7).
Spot Check Parameters (Pages 7-8):
The system provides a comprehensive list of parameters that can be checked for diagnosis and monitoring. These include:
- Communication Status: Outdoor unit communication malfunction (E0), Communication between master outdoor unit and indoor units (E2), Communication malfunction between main PCB and IPM board (XH0), Communication malfunction between 0537 and 0547 in main PCB (H1).
- Sensor Faults: Discharge temperature sensor fault (E3), Ambient temperature sensor malfunction (E4), T6A temperature sensor fault (E5), Outdoor heat exchanger temperature sensor malfunction (E6), T6B temperature sensor fault (E7), Refrigerant cooling temperature sensor fault (EA), Discharge pressure sensor error (H8).
- Electrical Parameters: AC voltage protection (E9), AC voltage (36), DC bus line voltage of compressor A (37), DC bus line voltage of compressor B (38).
- Compressor Data: Secondary side current of inverter compressor A (34), Secondary side current of inverter compressor B (35), Inverter compressor over current protection (XP3), Drive code of compressor A (55), Drive code of compressor B (56), Frequency limit of compressor A (57), Frequency limit of compressor B (58).
- Temperature & Pressure: System high pressure (P1), Low pressure protection (P2), High discharge temperature protection (XP4), High T3 temperature protection (P5), T2B target value A (for cooling mode) (44), T2 target value B (for heating mode) (45), T3 for exiting defrosting (48).
- Operation Modes: Priority mode (39), Silence mode (40), Static pressure mode (41), Power saving value (46).
- Other: Refrigerant status (43), Longest defrosting time (47), Allowed indoor unit offline time (49), Allowed quantity of offline indoor unit (50), Last error code (60).
Historical Error Code Query (Page 10):
- Access by pressing 'CHECK_A' or 'CHECK_B' button to item 60.
- Long press 'COOL' button for 3s to enter historical fault query.
- 'N1.' indicates the second to last fault, up to 'N63.' for the 64th last fault.
- Faults are stored even after power failure.
- System returns to frequency display or standby after 20s of inactivity.
Parameter Settings at Project Site (Page 10):
- Long press 'COOL' button for 3s to enter parameter setting (SHx displayed).
- Short press 'COOL' button to switch parameter items (SH1->SH2->SH3...).
- Change parameters using 'CHECK_A' or 'CHECK_B' buttons.
- Settings are saved automatically after 10s of inactivity.
- System returns to frequency display or standby after 20s of inactivity.
- SH1: Cooling T2B target value A (5-15°C, default 8°C).
- SH2: Heating T2 target value B (40-50°C, default 44°C).
- SH3: Power saving mode value C (40-100%, default 100%).
- SH4: Auto charging refrigerant function (0&1, default 0). SV10 valve closed if 0, opened according to date if 1. This parameter resets to 0 after power off.
- SH5: Longest defrosting period (5-20 min, default 10 min).
- SH6: Exit defrost temperature T3 value (10-18°C, default 15°C).
- SH7: Allowed indoor unit offline time value (60-480 min, default 60 min).
- SH8: Allowed indoor unit offline quantity value (0-6 pcs, default 2 pcs).
- SH9: Reserved.
Forced Cooling (Page 10):
- Short press 'COOL' button to enter forced cooling mode ('dC' displayed).
- Short press 'COOL' button again to exit forced cooling to standby mode.
- Automatically exits after 1 hour.
Electric Wiring Installations (Pages 11-14):
- Highlights:
- Separate power design for indoor and outdoor units.
- Special circuit with circuit breaker and manual switch.
- Indoor units connected to the same outdoor unit must be on the same circuit and operate simultaneously.
- 2-core shielded wiring for communication lines between indoor and outdoor units.
- Wiring, parts, and materials must comply with local and national regulations.
- All field wiring by qualified electricians.
- Grounding according to local and national electrical regulations.
- Current leakage protection switch (1.5-2 times total loading rated current).
- Cable clamps for wiring and wire holders.
- Refrigerant piping and wiring systems are different.
- Do not connect power wire to signal wire terminal.
- Maintain proper gap between power and signal wires (10A below 300mm, 50A below 500mm).
- Voltage discrepancy at power wire terminal and end voltage less than 2%. Thicken wire if length cannot be shortened.
- Voltage discrepancy between phases less than 2% rated value.
- Current discrepancy between highest and lowest phase less than 3% rated value.
- Wiring Selection:
- Voltage loss must meet terminal voltage requirements for normal operation.
- Current-carrying capacity must not be less than the largest current of the unit.
- Conductor stability for movement and heating.
- Smallest sectional area for mechanical strength.
- PE line sectional area according to regulations (S for S≤16mm², 16mm² for 16<S<35mm², S/2 for S>35mm²).
- Distribution Wiring Highlights:
- Different colors for phase, zero, and protection earth wires.
- Prohibited to bind power and control wires with refrigerant piping.
- Separate distribution with wire tubes, 500mm gap between control and power lines.
- Pipe Wiring: Metal wire tubes for indoor/outdoor (not acid/alkali corrosive areas). Plastic wire tubes for indoor/corrosive areas (not mechanical damage areas). No end joints in pipe wiring; use connection box if joint is necessary.
- Wiring with different voltages should not pass through the same wire tube.
- Total sectional area of wiring through wire tube ≤ 40% valid area.
- Fixing point of wire tube support: Metal pipe (1.5m for 15-20mm, 2m for 25-32mm, 2.5m for 40-50mm); Plastic pipe (1m for 15-20mm, 1.5m for 25-32mm, 2m for 40-50mm).
- Outdoor Unit Power Wiring Selection (Page 12):
- Separate Power Supply (without power facility): Table provides shortest wiring diameter (mm²), manual switch (A), and circuit breaker for various GCHV models (E252W/ZR1 to E615W/ZR1) based on HP and length (<20m, ≤50m).
- Note: Length in table assumes voltage drop within 2%. Select larger wire diameter if length exceeds.
- Power Facilities (with leakage protector) (Page 13):
- Select power wire for five models separately according to relevant standard.
- Wiring diameter and length in the table indicate voltage dropping range within 2%.
- Power wiring includes main wire (a) connecting to branch box and wire (b) between branch box and power facilities.
- Diameter of main wire (a) depends on total horse power (HP) of outdoor unit (See (5)).
- Diameter of wire (b) depends on number of combined outdoor unit.
- If outdoor unit quantity ≥ 5, there will be 2 electric control boxes, and wire (b) diameter selection depends on total HP of outdoor units connecting to each electric control box (See (5)).
- Table for manual switch and fuse capacity based on total HP (8-10HP to 78-88HP).
- Reference table for cable size for each capacity (8HP to 42HP) based on wire length (<20m, 20m<length≤50m).
- Remark: Selection is for reference; actual electrical project should consider cable layout, space, etc.
- Indoor Unit Power Wiring Selection (Page 15):
- Refrigerant piping system, signal wires between indoor-indoor units, and outdoor-outdoor units into one system.
- Signal wire and power wire should not be in the same wire tube; maintain distance (less than 10A--300mm, less than 50A--500mm).
- Set outdoor unit address for parallel multi-outdoor units.
Communication System (Pages 16-18):
- Control System Introduction:
- Control line should be shielded wire (diameter ≥0.75 mm²).
- Shielded nets of the two sides of shielded wires are grounded to earth, or connected with each other and jointed to the sheet metal along to the earth.
- Control wire should not be bound together with refrigerant pipeline and power wire.
- Control wire should not form closed loop.
- Control wire has polarity; be careful when connecting.
- Selection of Control Wire Specification: Table lists models (AVP, AVP-105, RVP, RVP-105, RVVP, RVVP1) and their corresponding names (Copper core PVC insulation shielded wire, Heat-resistant 105°C PVC insulation shielded wire, PVC insulation shielded flexible wire, Heat-resistant 105°C PVC insulation shielded flexible wire, PVC insulation shielded PVC sheath flexible wire, PVC insulation entangled shielded PVC sheath flexible wire).
- Signal Wire of Indoor/Outdoor Units:
- Signal line adopts 2-core shielded wire with area above 0.75 mm².
- 2 cores connected to P, Q or H1, H2 terminals.
- Shielded layer connected to E terminals.
- Do not bind signal line and copper pipe together.
- Shield metal layer should be grounded well in indoor control box.
- Forbidden to connect 200V or above high-volt live wire to communication terminal.
- Correct Connection (Page 18): Diagram shows correct wiring for master/slave outdoor units and indoor units. Shielded layer connected to steel pane of electrical control box.
- Typical Wrong Connection (Pages 19-20):
- Loop Connection of Signal Wire: Diagram shows incorrect loop connection.
- Star Connection of Signal Wire: Diagram shows incorrect star connection for part and all signal wires.
- Reverse Connection of Signal Wire: Diagram shows incorrect reverse connection for outdoor unit to indoor unit and indoor unit to indoor unit (P and Q have polarity, it is inverted).
Controllers (Pages 21-24):
- Wireless Remote Controller (Page 21):
- Model: NT-03 common remote controller.
- LCD Screen Icon Introduction (Page 22):
- Mode Display: Automatic, cooling, dehumidification, fan, heating.
- Temperature Display: 16-32°C (61-90°F).
- Wind Speed Display: Wind speed, automatic wind speed.
- Swinging Display: External pendulum wind, internal pendulum wind.
- Timer Display: TIME ON, TIME OFF.
- Other Display: Clock, sleep, TURBO, ECON, cleaning, electric heating, address, lock, lack of electricity, Auto Config, power saving, healthy, new wind, intelligence, lamplight.
- Button Function of Remote Controller (Pages 23-24):
- ON/OFF:
- Switches "on, off, on" circularly.
- Default state on first power on: 25°C (77°F), automatic mode, automatic fan speed, internal/external pendulum wind, no TURBO, no sleep, no timer, no lock.
- Recovers state before shutdown (sleep, TURBO, ECON, timer functions canceled).
- Mode:
- Switches "automatic, cooling, dehumidification, fan, heating, automatic" circularly.
- Dehumidification mode: locked at 25°C, temperature not adjustable, internal pendulum wind unchanged, external pendulum wind forced to close.
- Temperature Reduction (▼):
- Reduces setting temperature by 1°C/°F (32°C to 16°C, 90°F to 61°F).
- No change in dehumidification and fan mode.
- Used to set clock time in clock setting state.
- Continuous change with prolonged press.
- Temperature Addition (▲):
- Adds setting temperature by 1°C/°F (16°C to 32°C, 61°F to 90°F).
- No change in dehumidification and fan mode.
- Used to set clock time in clock setting state.
- Continuous change with prolonged press.
- Up and Down Swinging (External Pendulum Wind):
- Forced close in dehumidification mode.
- Switches "swing, fixed wind, swing" circularly in other modes.
- Left and Right Swinging (Internal Pendulum Wind):
- Unchanged in dehumidification mode.
- Switches "swing, stop, swing" circularly in other modes.
- FAN -:
- Default: automatic wind speed.
- Dehumidification mode: fixed to low wind, not adjustable.
- Switches "automatic, high, middle, low, automatic" circularly in other modes.
- FAN +:
- Default: automatic wind speed.
- Dehumidification mode: fixed to low wind, not adjustable.
- Switches "automatic, low, middle, high, automatic" circularly in other modes.
- Timer:
- Sets opening time (1-24h) in shutdown state.
- Sets shutdown time (1-24h) in boot state.
- Timing cycle: "1h, 2h, ..., 23h, 24h, cancel, 1h".
- Exits adjustment after 3s without key press.
- TURBO:
- Remote controller has this effect. Default: no TURBO.
- Does not work in automatic, dehumidification, fan modes.
- Switches between opening/closing in cooling/heating modes.
- No wind speed display in TURBO mode.
- Switching mode or entering sleep closes TURBO mode.
- If 4-gear wind speeds, TURBO icon lights up, fan runs at 4th gear.
- ECON:
- Remote controller has this effect. Default: no ECON.
- Does not work in automatic, dehumidification, fan modes.
- Switches between opening/closing in cooling/heating modes.
- In ECON mode, setting temperature is 26°C (77°F), other settings unchanged.
- Closing ECON mode recovers previous settings.
- Switching mode closes ECON mode.
- Sleep:
- Switches between opening/closing in modes other than fan mode.
- Switching mode cancels sleep function.
- Wind speed automatically switches to low wind but can be adjusted (except dehumidification mode).
- Light:
- Default: lamplight ON.
- Forces ON/OFF lamplight.
- Clock:
- Used to set clock. Pressing enters hour adjustment (0-23h), set by temperature keys.
- Pressing again enters minute adjustment (00-59), set by temperature keys.
- Pressing again confirms setting; exits adjustment after 3s of inactivity.
- Lock:
- Default: no lock.
- Switches between opening/closing.
- When locked, remote controller does not work except lock key.
- Combinatorial Key ("FAN -" + "FAN +"):
- Remote controller has this effect.
- Switches between 3-gear and 6-gear wind.
- On LCD, 6-gear wind is shown. If 3-gear wind is selected, 1st and 2nd gear are "low wind"; 3rd and 4th gear are "middle wind"; 5th and 6th gear are "high wind".
- Wired Controller (Page 25):
- The remote control board is responsible for the operational status of the system through the control button, through the LCD to display the working status of the whole system, responsible for system control board for communication.
- Safety Precautions:
- Read safety precautions before installation.
- Confirm no abnormal phenomenon during test operation.
- Installation by professionals.
- Improper installation may cause electric shock or fire.
- Random disassembly may cause abnormal operation or heating.
- Do not install in place where combustible gas easily leaks.
- Wire must be suitable for current of controller.
- Wire must be suitable for controller, never bring outside force to bear on terminal.
- Installation (Page 26):
- Do not install in place with oil, steam, sculpture gas, or else deform or malfunction may occur.
- Wire Controller Installation Notes:
- Refer to indoor unit installation manual for connecting between wire controller and indoor unit.
- Circuit of wire controller is low voltage circuit. Connect with a standard 220V/380V circuit or put into a same wiring tube with the circuit.
- Shield cable must be connected stable to the ground, or transmission may fail.
- Do not attempt to extend the shield cable by cutting.
- After finishing connection, do not use Mugger to have the insulation check to the signal wire.
- Shielded Cable: Use 5-core shielded cable in the attachment. If total wiring length from attachment is not long enough, it can be lengthened. Overall length shall not exceed 20m.
Usage Features
- Flexible Operation Modes: The system supports various operation modes including automatic, cooling, dehumidification, fan, and heating, catering to different environmental needs.
- Customizable Settings: Users can adjust parameters such as temperature, fan speed, and specific operational modes (e.g., TURBO, ECON, Sleep) via the remote controller or through project site parameter settings.
- Multi-Unit Scalability: The system can be configured with multiple outdoor units (master and slave units) to accommodate larger installations, with specific addressing and communication protocols.
- Night Silent Operation: A dedicated mode to reduce noise levels during nighttime hours, with configurable start times and durations.
- Snow-Blowing Function: An automatic feature to prevent ice accumulation on outdoor units in cold weather.
- Forced Cooling: A diagnostic or quick-cooling feature that can be activated for a limited time.
- Error Code Display: The system provides detailed error codes for quick diagnosis of malfunctions and protections, including historical error logs.
- Power Saving Mode: An ECON mode is available to optimize energy consumption by setting a fixed temperature and maintaining other settings.
- Timer Functions: Users can set ON/OFF timers for scheduled operation.
- Lock Function: The remote controller can be locked to prevent unintended changes to settings.
Maintenance Features
- Diagnostic Error Codes: A comprehensive list of error codes (E0-XL9) helps in quickly identifying and troubleshooting system malfunctions, from communication errors to sensor faults and compressor issues.
- Historical Fault Query: The ability to retrieve up to 64 historical fault codes, even after power failure, aids in understanding recurring issues and long-term system health.
- Parameter Settings for Technicians: Specific parameters (SH1-SH9) can be adjusted at the project site by technicians to fine-tune system performance, such as target temperatures, power saving levels, defrosting periods, and offline unit allowances.
- Wiring Guidelines: Detailed instructions for electrical wiring, including shielded cables, grounding, and separation of power and signal lines, ensure proper installation and reduce interference, contributing to system reliability and ease of maintenance.
- Communication System Checks: The documentation highlights correct and incorrect wiring configurations for the communication system, which is crucial for troubleshooting communication-related errors.
- Remote Controller Diagnostics: The remote controller's LCD icons and button functions provide immediate feedback on the system's operational status and any active modes or errors, assisting in initial user-level diagnostics.
- Forced Operation Modes: Forced cooling mode can be used for testing and verifying system functionality during maintenance.
- Safety Precautions: Emphasized safety precautions for installation and maintenance, including the use of qualified electricians and adherence to local regulations, are critical for preventing accidents and ensuring safe operation.
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