This document is a service manual for LG Heat Pump Water Heaters, specifically models APHWC501M(R5TT50F-SA1) and APHWC801M(R5TT80F-SA1). It provides essential information for servicing, including safety precautions, technical specifications, wiring diagrams, exploded views, and disassembly instructions.
Function Description
The LG Heat Pump Water Heater is designed to provide hot water using a heat pump system, which is more energy-efficient than traditional electric resistance water heaters. The system utilizes refrigerant R134a and incorporates both heat pump heating and auxiliary electric heating elements to ensure a consistent supply of hot water. It features a "Smart Function + Hybrid Mode" for optimized operation, allowing users to balance energy efficiency and hot water availability. The unit includes a digital display for user interaction and Wi-Fi connectivity for remote monitoring and control.
Important Technical Specifications
Models: APHWC501M and APHWC801M
Capacity:
- APHWC501M: 58 gallons (220 liters) nominal, 53 gallons (201 liters) rated.
- APHWC801M: 80 gallons (303 liters) nominal, 72 gallons (273 liters) rated.
Energy Efficiency:
- UEF (Draw Pattern Medium): Not specified.
- UEF (Draw Pattern High): APHWC501M: 3.93, APHWC801M: 3.90.
- FHR (First Hour Rating): APHWC501M: 76 gallons, APHWC801M: 94 gallons.
- Annual Energy Consumption: APHWC501M: 1262 kWh, APHWC801M: 1272 kWh.
- Energy Star: Both models are Energy Star certified.
Power Input:
- Power Supply: 1Ø, 208/240V, 60Hz.
- Available Voltage Range: 176~276V.
- Upper/Lower Element Wattage (208V / 240V): 3.8/5.0 kW for both elements in both models.
- Minimum Circuit Ampacity: 30.1 A.
- Maximum Circuit Breaker (Heat Pump & Heater): 30 A.
Refrigeration System:
- Refrigerant Type: R134a.
- Pre-Charge: APHWC501M: 23 oz., APHWC801M: 26 oz.
- Compressor Type: Twin Rotary, Model EST092MBA, BLDC motor.
- Oil Type: POE PVE.
- Oil Charge: 220 cc.
- Control: Electronic Expansion Valve (EEV).
- Defrost Method: Reverse Cycle.
Dimensions and Weight:
- APHWC501M:
- Net (W x H x D): 22-27/32 x 63-31/32 x 22-29/32 inches.
- Shipping (W x H x D): 29-1/16 x 69-7/8 x 27-5/32 inches.
- Net Weight: 220 lbs.
- Shipping Weight: 260 lbs.
- APHWC801M:
- Net (W x H x D): 22-27/32 x 79-1/16 x 22-29/32 inches.
- Shipping (W x H x D): 29-1/16 x 84-31/32 x 27-5/32 inches.
- Net Weight: 262 lbs.
- Shipping Weight: 304 lbs.
Other Specifications:
- Air Flow Rate (Rated): 155.4 CFM.
- Sound Pressure Level: Auto: 42 dB(A), Turbo/Heat Pump: 45 dB(A).
- Operation Range (Heating): 23~120 °F DB.
- Exterior Color: Luxury Silver.
- Water Connection Location: Side.
- Water Connection Size: 3/4 inch.
- Foam Insulation: 1.6~2.4 inches.
- T&P Relief Valve: Yes.
- Anode: Sacrificial.
Usage Features
The LG Heat Pump Water Heater is designed for residential use, providing an energy-efficient solution for hot water needs. Its "Smart Function + Hybrid Mode" allows for flexible operation, potentially reducing electricity consumption compared to conventional water heaters. The digital display offers easy access to settings and operational status, while Wi-Fi connectivity enables remote management through smart devices. The unit's design includes a sacrificial anode for tank protection and a T&P (Temperature and Pressure) relief valve for safety.
Maintenance Features
The service manual outlines detailed procedures for disassembly and repair, ensuring that qualified technicians can effectively maintain the unit. Key maintenance aspects include:
- Safety Precautions: Emphasizes disconnecting power, proper grounding, handling refrigerant safely, and discharging capacitors before servicing to prevent electric shock, injury, or fire.
- Inspections After Repair: Instructions to check power cable condition, proper component mounting, wire connections, installation platform integrity, earth wire connection, insulation resistance (2 Mohm or more), and drainage functionality.
- Disassembly Procedures: Step-by-step guides for removing the top cover, front panel, rear panel, control box, motor, fan, shroud, heating elements, and ECO (Emergency Cut Off) device. These procedures often involve removing screws, disconnecting connectors, and carefully lifting components.
- Piping Diagram: Illustrates the refrigerant flow and the location of thermistors (discharge pipe, evaporating temperature, indoor air, suction pipe, upper water tank, lower water tank) for diagnostic purposes.
- Wiring Diagram: Provides a comprehensive overview of electrical connections, including power supply, heating elements, compressor, fan, control board (PCB), and various sensors.
- Exploded View: Offers a visual breakdown of components, aiding in identification and reassembly during repairs.
The manual stresses the importance of proper ventilation during welding or refrigerant handling to prevent oxygen deficiency and exposure to poisonous gases. It also highlights the need to allow the refrigerating cycle section to cool down sufficiently before performing work to avoid burns.
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