This document describes a Commercial Series Air Source Heat Pump Water Heater, available in models GT-SKR030P, GT-SKR050P, GT-SKR070P, GT-SKR100P, GT-SKR150P, GT-SKR030B (commercial unit), and GT-SKR050B.
Function Description
Air source heat pump water heaters are designed to produce hot water for various applications, including space heating, domestic hot water systems, or commercial hot water systems. The basic principle of operation is similar to an air conditioner in cooling mode, but in heating mode, the refrigerant flow is reversed. Heat is extracted from the outside air to heat air or water. The heat pump absorbs heat where it is plentiful, transports it, and releases it where it can be used for heating. This process exploits the refrigerant fluid's ability to boil from a liquid to a vapor and then condense back into a liquid, a continuous cycle while the compressor runs.
Important Technical Specifications
- Operating Temperature Range: The unit is designed for outdoor installation. When ambient temperature is lower than 0°C, the unit should be drained to prevent ice formation. If power failure lasts more than 3-5 hours with ambient temperature below 2°C, drain water to prevent ice.
- Water Temperature Setting: The desired water tank temperature can be set between 28-60 degrees Celsius. The unit automatically stops when the desired temperature is reached and restarts if the temperature drops by 5°C (default difference).
- Compressor Delay Protection: A 3-minute delay is implemented for compressor start/stop to protect the compressor. The first start-up after power-on has a 1-minute delay.
- Defrosting: Coil temperature to start defrosting is -1~-9°C (default -3°C). Coil temperature to stop defrosting is 5~25°C (default 12°C). Time interval for defrosting is 10~90 minutes (default 45 minutes). Running time of defrosting is 5-17 minutes (default 10 minutes).
- Electrical Heating: Auxiliary electrical heating functions when ambient temperature is lower than the set temperature (default 5°C, range 0~35°C).
- Water Return Temperature: Can be set between 28-60°C (default 40°C) for commercial units.
- Safety Features: Includes compressor delay protection, dual pressure protection (high and low), overheating protection, anti-phase and open-phase protection, and high temperature protection. A leakage protection switch must be installed near the heat pump.
- Water Level Control: Users can adjust high and low water levels. For pressurized water tanks, magnetic valves and high/low water level switches are not required.
- Pipe Run Limitations: Vertical distance between the unit and water tank must be less than 6m, and horizontal distance not more than 20m.
Usage Features
- Wide Application: Suitable for villas, factories, schools, hospitals, hotels, restaurants, swimming pools and spas, bath centers, laundries, etc.
- Enhanced Safety: Water and electricity are completely isolated, eliminating electric shock risks. No fuel tubes or storage means no danger from oil leakage, fire, or explosion.
- Energy-saving: Provides hot water at 1/4 the cost of electrical water heaters.
- High Efficiency: Utilizes a super-sized evaporator coil with hydrophilic aluminum fins and rifled copper pipe, and a high-efficiency tube-in-shell heat exchanger.
- Reliable Compressor: Equipped with world-renowned compressors (Copeland, Panasonic, Sanyo, Toshiba) for reliability, quiet operation, energy efficiency, and environmental friendliness.
- Monoblock Design: Offers convenient installation and a neat appearance.
- All-weather Running: Delivers reliable hot water regardless of rain, snow, or night.
- Automatic Operation: Micro-computer controlled with timer function, allowing automatic start-up and stop based on water temperature and other conditions, eliminating the need for constant supervision.
- Environmental Friendly: Pollution-free, reducing global greenhouse gas effects.
- Control System: Features a PCB and operation panel with integrated functions and a large screen. Buttons can be locked/unlocked.
- Timer Functionality: Allows setting up to three periods for unit On/Off and water supply.
- Manual Water Supply Control: Users can manually control water supply when the water tank temperature reaches the set point.
- Data Review: Allows reviewing actual measured data such as coil temperature, ambient temperature, water outlet temperature, and water tank temperature.
- Fault Codes: The system displays recoverable fault codes (e.g., "01E" for overheat protection, "03E" for high pressure, "04E" for low pressure, "02E" for current issues) and sounds alarms.
Maintenance Features
- Qualified Technician Requirement: Installation and repair must be performed by qualified technicians.
- Power Disconnection: Always switch off and shut off power to the unit before any maintenance.
- Cleaning: External parts can be wiped with a damp cloth and domestic cleaner. Avoid petrol, naphtha, dissolvent, or other chemicals.
- Drainage: If the unit is shut down for a long time or ambient temperature is below 0°C, drain the water from the pipes.
- Heat Exchanger Cleaning: Advised to clean the heat exchanger with phosphoric acid (15% consistency, 50~60℃) for 3 hours, followed by three tap water flushes. Do not use amyctic detergent.
- Relocation: Contact the dealer or local Customer Service for assistance if the installation site needs to be changed.
- Regular Checks: Ensure proper water flow, clear air intake/outlet paths, and functioning condensate outflow.
- Safety Distances: Maintain adequate space around the unit for maintenance and service operations.