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Hitachi RAW-25NH2A - User Manual

Hitachi RAW-25NH2A
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ENGLISH
OUTDOOR UNIT
OPERATION MANUAL
TANK UNIT OUTDOOR UNIT
TAW-270NH2A / RAW-25NH2A
TAW-270NH2A
MODEL
TANK UNIT
Instruction manual Page 1~26
To obtain the best performance, please read this instruction manual completely.
SANITARY HOT WATER HEAT PUMP
RAW-25NH2A
FRANÇAIS
DEUTSCH
SVENSKA
TAW-270NH2A (EN1) 1 12/15/11 5:23 PM
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Summary

Safety Precautions

PRECAUTIONS DURING INSTALLATION

Safety measures and warnings specific to the installation process.

HANDLING AND MAINTENANCE SAFETY

Safety guidelines for operating, handling, and maintaining the unit to prevent injury.

Preparation

NAME OF EACH PART

Identifies and describes the components of the tank and outdoor units.

CONTROL PANEL FUNCTIONALITY

Explains the buttons, indicators, and display of the control panel.

INITIAL OPERATION SETUP

Guides for filling the tank and turning on the unit for the first time.

SETTING THE CURRENT TIME

Instructions for setting the current time and day of the week.

SETTING HOT WATER TEMPERATURE

How to adjust the desired hot water temperature setting.

Operation

STANDARD OPERATION

Basic steps for starting, operating, and stopping the unit for normal use.

Instruction of Each Function

TIMER FUNCTION (DAILY MODE)

Setting daily timers for operation modes.

TIMER FUNCTION (DIFFERENT MODES DAILY)

Setting different timer modes for each day of the week.

ECO MODE FUNCTION

Using ECO mode for energy-efficient heating without the electric heater.

ANTI-BACTERIA FUNCTION

Activating anti-bacteria mode to sterilize water weekly.

BOOST FUNCTION

Utilizing boost function for faster heating with full power.

EMERGENCY FUNCTION

Operation in emergency situations when the outdoor unit fails.

Maintenance

PRECAUTIONS DURING MAINTENANCE

Essential safety warnings before performing any maintenance tasks.

REGULAR AND MONTHLY INSPECTION TASKS

Routine checks including unit, water leakage, and monthly inspections.

YEARLY INSPECTION AND MAINTENANCE

Annual checks for water softener, scaling, ground, and mounting frame.

Troubleshooting

SOUNDS DURING OPERATION

Identifies normal operating sounds and their causes.

OPERATION ISSUES AND CHECKS

Common problems like unit not operating or water not heating, with checks.

After-Sales Services

SYMPTOMS REQUIRING SERVICE

List of critical symptoms that necessitate calling a sales agent.

TECHNICAL SPECIFICATIONS

Detailed technical data for the tank and outdoor units.

Summary

Safety Precautions

PRECAUTIONS DURING INSTALLATION

Safety measures and warnings specific to the installation process.

HANDLING AND MAINTENANCE SAFETY

Safety guidelines for operating, handling, and maintaining the unit to prevent injury.

Preparation

NAME OF EACH PART

Identifies and describes the components of the tank and outdoor units.

CONTROL PANEL FUNCTIONALITY

Explains the buttons, indicators, and display of the control panel.

INITIAL OPERATION SETUP

Guides for filling the tank and turning on the unit for the first time.

SETTING THE CURRENT TIME

Instructions for setting the current time and day of the week.

SETTING HOT WATER TEMPERATURE

How to adjust the desired hot water temperature setting.

Operation

STANDARD OPERATION

Basic steps for starting, operating, and stopping the unit for normal use.

Instruction of Each Function

TIMER FUNCTION (DAILY MODE)

Setting daily timers for operation modes.

TIMER FUNCTION (DIFFERENT MODES DAILY)

Setting different timer modes for each day of the week.

ECO MODE FUNCTION

Using ECO mode for energy-efficient heating without the electric heater.

ANTI-BACTERIA FUNCTION

Activating anti-bacteria mode to sterilize water weekly.

BOOST FUNCTION

Utilizing boost function for faster heating with full power.

EMERGENCY FUNCTION

Operation in emergency situations when the outdoor unit fails.

Maintenance

PRECAUTIONS DURING MAINTENANCE

Essential safety warnings before performing any maintenance tasks.

REGULAR AND MONTHLY INSPECTION TASKS

Routine checks including unit, water leakage, and monthly inspections.

YEARLY INSPECTION AND MAINTENANCE

Annual checks for water softener, scaling, ground, and mounting frame.

Troubleshooting

SOUNDS DURING OPERATION

Identifies normal operating sounds and their causes.

OPERATION ISSUES AND CHECKS

Common problems like unit not operating or water not heating, with checks.

After-Sales Services

SYMPTOMS REQUIRING SERVICE

List of critical symptoms that necessitate calling a sales agent.

TECHNICAL SPECIFICATIONS

Detailed technical data for the tank and outdoor units.

Overview

This document is an operation manual for the Hitachi Sanitary Hot Water Heat Pump, specifically models TAW-270NH2A (Tank Unit) and RAW-25NH2A (Outdoor Unit). It provides comprehensive information for installation, operation, maintenance, and troubleshooting.

Function Description:

The Hitachi Sanitary Hot Water Heat Pump is designed to provide sanitary hot water for residential use. It operates by extracting heat from the ambient air using a heat pump system, which is a more energy-efficient method than traditional electric water heaters. The system consists of an indoor tank unit for water storage and an outdoor unit that houses the heat pump compressor and heat exchanger. The unit can operate in different modes, including standard heating, ECO mode for energy saving, and anti-bacteria mode for water sterilization. It also features a boost function for rapid heating and an emergency function in case of outdoor unit failure.

Important Technical Specifications:

  • Model Names: TAW-270NH2A (Tank Unit) / RAW-25NH2A (Outdoor Unit)
  • Power Source: 1Ø 230V 50Hz
  • Maximum Current: 16 A
  • Tank Nominal Volume (Vn): 262 dm³
  • Setting Temperature of Performance Below: 53 °C
  • COPt: 3.09
  • Reference Hot Water Temp. (wr): 53.3 °C
  • Maximum Quantity of Hot Water (Vmax) (converted to 40°C): 375 L
  • Heating Up Time (th): 6 h: 20 min
  • Heating Up Energy Input (Weh): 3.84 kWh
  • Stand By Effective Power Input (Pes): 30 W
  • Electric Heater: 2 kW
  • Sound Level: 46 dB(A) (Outdoor Unit)
  • Water Tank Rated Pressure: 0.7 MPa
  • Outside Air Operating Temperature: -15°C to 37°C
  • Temperature Setting Range: 40°C to 65°C
  • IP Protection Rating: IPX1 (Tank Unit) / IPX4 (Outdoor Unit)
  • Refrigerant: R410a (0.95kg), GWP 2000
  • Refrigerant Circuit Pressure (Max): 4.15 MPa
  • Tank Material: Stainless Steel SUS304
  • Dimensions (W x H x D):
    • Tank Unit: 600 x 1,570 x 730 mm
    • Outdoor Unit: 750 x 570 x 280 mm
  • Net Weight:
    • Tank Unit: 63 kg (DRY)
    • Outdoor Unit: 38 kg
  • Test Condition: EN16147 (Indoor Ambient Air 20°C - Outdoor Air 7°C - Tapping Cycle XL)
  • Sound Test Standard: JISZ8731

Usage Features:

  • Control Panel: Features a 7-segment LED indicator for water temperature, time, and other information. Includes buttons for START/STOP, ECO mode, Boost, Anti-bacteria, Function, Set, and Up/Down for navigation and setting adjustments.
  • Power Supply Systems: Supports both full-time power supply and off-peak power supply systems, with available functionality depending on the power contract.
  • Time Setting: Allows users to set the current time and day of the week, crucial for timer operation. An extended power outage (30 minutes or longer) will cancel the time setting.
  • Hot Water Temperature Setting: Adjustable from 40°C to 65°C, with a recommended range of 40°C to 55°C for efficient operation. The factory default is 55°C. The operation mode (heat pump only or with electric heater) automatically adjusts based on the set temperature.
  • Standard Operation: The unit heats water to the set temperature. The heating operation LED lights up, and blinks during defrosting. Defrosting occurs approximately once an hour for 5-10 minutes when frost forms on the outdoor unit's heat exchanger.
  • Timer Function: Two timer settings can be made per day. Users can set the same mode for every day or different modes for each day of the week. This function is only available with a full-time power supply.
  • ECO Mode: Uses only the heater pump for heating, without engaging the electric heater, to reduce power consumption. Water temperature can be set between 40°C and 55°C in this mode.
  • Anti-bacteria Function: Raises the tank temperature to 65°C once a week to sterilize the water. In a full-time power supply system, it starts at 22:00 on Sunday. In an off-peak system, it runs in one out of every seven operating sessions. This mode uses the electric heater.
  • Boost Function: Operates the electric heater and the heat pump at full power to quickly reach the boiling temperature. Not available during anti-bacteria mode.
  • Emergency Function: In case of outdoor unit failure (E1 ** error code), the electric heater can be used for emergency operation for a limited time. The water temperature is fixed at 55°C, and ECO, Boost, or Anti-bacteria modes cannot be used.

Maintenance Features:

  • Safety Precautions: Emphasizes critical safety measures during installation, handling, and maintenance, including proper grounding, avoiding modifications, installing a pressure-relief valve, and ensuring correct water supply.
  • Unit Maintenance: Regular cleaning with a dry cloth or a cloth dampened with kitchen detergent and water. Avoid using harsh chemicals or hot water above 40°C.
  • Water Leakage Inspection: Check for leaks from pipe joints and the leak water receiver after filling the tank.
  • Monthly Inspection:
    • Safety Pressure-Relief Valve: Operate the valve and check for water leaks from the drain pipe.
    • Circuit Breaker: Operate the circuit breaker.
    • Time Check: Verify and adjust the time setting as needed.
  • Yearly Inspection:
    • Water Softener Inspection: Set water hardness to 15-20°F.
    • Scaling Removal: Authorized personnel should remove scaling from the hot-water tank.
    • Ground Connection Inspection: Ensure the unit is properly grounded.
    • Outdoor Mounting Frame Inspection: Check for stable installation and rust.
    • Regular Inspection and Maintenance for Hot-Water Tank: Includes checking for water leaks, electrical insulation, insulator for piping, electric heater, pressure reducing valves, auto purge valve, and discharging scale sediment.
  • Replacement of Parts: Packings, pressure reducing valves, pressure-relief valves, and auto purge valves wear out and may need replacement based on water quality and inspection results.
  • Power Failure: Heating operation resumes after a short power outage. For outages lasting 30 minutes or longer, the current time setting must be reset.
  • Suspension of Water Supply: Turn off the water heater water valve during water supply interruptions to prevent strainers from clogging and water turbidity.
  • Extended Non-Use: For periods of a month or more, turn off the circuit breaker and drain the tank. For shorter periods, turn off the circuit breaker and close the water valve.
  • Draining Procedure: Involves turning off the circuit breaker, closing mixer taps, opening hot water knobs, and opening the drain valve.

Hitachi RAW-25NH2A Specifications

General IconGeneral
BrandHitachi
ModelRAW-25NH2A
CategoryHeat Pump
LanguageEnglish

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