NORITZ Gas Water Heater Instruction Manual

1. Important Safety Information

Please read all safety instructions carefully before installation and operation to prevent accidents, property damage, or injury. Keep this manual for future reference.

• Gas Type Verification: Always confirm that the gas type indicated on the product's nameplate matches the gas supply available (City Gas 12A, 13A, or LPG).
• Ventilation: Ensure adequate ventilation is provided in the installation area, considering the gas consumption of this unit and any other gas appliances in the same room.
• Fire Safety Clearance: Install the appliance in a location where surrounding walls are fire-safe or where effective fire-prevention clearances can be maintained.
• Combustible Materials: Maintain fire-safe separation distances from combustible materials (including parts of buildings finished with combustible, flame-retardant, or quasi-noncombustible materials). If sufficient clearance cannot be maintained, always implement fire protection measures using a heat shield.
• Leakage Inspection: After completing gas connections, always perform a leakage inspection.
• Professional Installation: Installation and related work must be performed by a qualified professional in accordance with all applicable laws and standards, including but not limited to: Technical Standards for Electrical Equipment, Electrician's Act, Internal Wiring Regulations, Electrical Appliance and Material Safety Act, Building Standards Act, local ordinances, Fire Service Act, Gas Business Act, Liquefied Petroleum Gas Act, and Gas Appliance Installation Standards and Practical Guidelines (issued by the Japan Gas Appliance Inspection Association).
• Warranty: Faults or damages resulting from installation that does not meet specified conditions will be subject to paid repair, even within the warranty period.
• Customer Responsibility: The customer is responsible for arranging the installation and related work for the appliance.
• Required Parts: Please prepare any parts not included with the product yourself.

2. Product Overview

The NORITZ GQ-2037WS-KB BL is a 20-liter capacity gas water heater designed for hot water supply only, featuring an auto-stop function. It is a wall-mounted unit suitable for city gas (12A/13A) installations.

Key Features:

• Hot water supply only with Auto-Stop function.
• Designed for City Gas (12A/13A).
• Wall-mounted installation type.
• Equipped with Q-function and power-saving mode.
• Solar compatibility (for non-auto-stop types, only when operating the main unit; set temperature may not be reached).

Figure 1: Technical drawing and specifications of the GQ-2037WS-KB BL gas water heater. This diagram illustrates the external dimensions, connection points for gas, water supply, hot water output, and electrical wiring, as well as internal component layout.

3. Installation

This appliance must be installed by a qualified professional. Refer to the detailed installation manual provided with the product for specific instructions and diagrams. The following are general guidelines:

• Location: Install outdoors as a wall-embedded unit. Ensure the location complies with all local building codes and safety regulations.
• Gas Connection: Gas connection diameter is R1/2 (15A). Ensure proper sealing and leak testing after connection.
• Water Connections: Water supply and hot water output connections are R1/2 (15A).
• Electrical Connection: Power supply is AC100V (50/60Hz). Power consumption is 37W (12A, 13A, LPG). Freeze prevention heater consumes 125W.
• Mounting: Use mounting box type III, IV, or V for installation. Refer to the technical drawing for mounting pitch (510mm vertically, 320mm horizontally).
• Exhaust: Forced exhaust type (push-in). Ensure the exhaust vent is clear and unobstructed.

4. Operation

The GQ-2037WS-KB BL water heater is designed for straightforward operation. A remote control is sold separately and is recommended for full functionality. Without a remote, basic operation may be possible directly from the unit, but temperature settings might not be precise.

• Auto-Stop Function: This feature automatically stops hot water supply once a preset volume or time is reached, preventing overflow or excessive use.
• Q-Function: Provides stable hot water temperature even with fluctuating water pressure.
• Power-Saving Mode: Optimizes energy consumption during periods of low demand.
• Temperature Adjustment: Hot water temperature can be adjusted within a range of 37-48, 60, 75°C (14 levels).
• Remote Control (Optional): For convenient control and access to all features, a remote control is recommended. Compatible remote controls include RC-7606M (kitchen), RC-7606S (bathroom) for non-auto-stop types, and RC-7607M (kitchen), RC-7607S (bathroom) for auto-stop types.

5. Maintenance

Regular maintenance ensures the longevity and efficient operation of your gas water heater. Always turn off the gas and power supply before performing any maintenance.

• Exterior Cleaning: Wipe the exterior with a soft, damp cloth. Do not use abrasive cleaners or solvents.
• Water Filter Cleaning: The water filter (part of the drain plug) should be periodically checked and cleaned to prevent blockages.
• Professional Inspection: It is recommended to have the unit inspected by a qualified service technician at least once a year to ensure all components are functioning correctly and safely.
• Freeze Prevention: The unit is equipped with a freeze prevention device (drain plug, electric heater). In extremely cold conditions, ensure proper drainage or consult a professional for additional measures.

6. Troubleshooting

If you encounter issues with your water heater, refer to the following basic troubleshooting steps. For complex problems, contact a qualified service technician.

• No Hot Water: Check if the gas supply is on, the power supply is connected, and the water pressure is adequate. Ensure no error codes are displayed on the remote or unit.
• Water Not Hot Enough: Verify the temperature setting. Check for sufficient gas flow and water pressure.
• Unusual Noises: If you hear unusual sounds, turn off the unit immediately and contact a service professional.
• Gas Odor: If you smell gas, immediately turn off the main gas supply, open windows for ventilation, and evacuate the premises. Do not operate any electrical switches or phones. Contact your gas company and a service professional.
• Error Codes: If an error code appears on the remote or unit, consult the detailed troubleshooting section in the full product manual or contact customer support.

7. Specifications

Note: Specifications are subject to change without prior notice for product improvement. Gas consumption, hot water output, and hot water supply capacity are based on 13A gas type.

8. Warranty and Support

NORITZ products are manufactured to high-quality standards. Please retain your proof of purchase for warranty purposes.

• Warranty Coverage: The warranty covers defects in materials and workmanship under normal use.
• Exclusions: Damage or malfunction caused by improper installation, misuse, neglect, unauthorized repairs, or external factors (e.g., natural disasters) are not covered under warranty. As stated in the safety information, faults or damages resulting from installation that does not meet specified conditions will be subject to paid repair, even within the warranty period.
• Service: For warranty claims or technical support, please contact your authorized NORITZ dealer or service center.
• Product Delays: Compensation for construction delays caused by product delays is not provided. Your understanding is appreciated.