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INSTALLATION GUIDE
DO NOT SPRAY AEROSOLS IN THE VICINITY OF THIS APPLIANCE WHILE IT IS IN
•
OPERATION.
DO NOT USE OR STORE FLAMMABLE MATERIALS IN OR NEAR THIS
•
APPLIANCE.
DO NOT PLACE ARTICLES ON OR AGAINST THIS APPLIANCE.
•
DO NOT MODIFY THIS APPLIANCE.
•
OWNER'S GUIDE
GAS WATER HEATERS
GS-20W-AU5/6
GS-26W-AU5/6
EXTERNAL INSTALLATION ONLY
WARNING
and
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Summary of Contents for Takagi GS-20W-AU5
- Page 1 INSTALLATION GUIDE OWNER’S GUIDE GAS WATER HEATERS GS-20W-AU5/6 GS-26W-AU5/6 EXTERNAL INSTALLATION ONLY WARNING DO NOT SPRAY AEROSOLS IN THE VICINITY OF THIS APPLIANCE WHILE IT IS IN • OPERATION. DO NOT USE OR STORE FLAMMABLE MATERIALS IN OR NEAR THIS •...
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Page 2: Table Of Contents
CONTENTS 1.IMPORTANT ..........2 REMOTE CONTROLLER INSTALLATION ..15 FOR THE INSTALLER ........2 CONNECTION OF REMOTE CONTROLLER FOR SERVICE ..........3 WIRING TO THE WATER HEATER ....16 FOR THE PLUMBER ........3 12.INITIAL OPERATION .........17 2.SPECIFICATIONS .........3 13.NORMAL OPERATION ......18 3.INTRODUCTION .........4 WITHOUT REMOTE CONTROLLER ....18 4.ACCESSORIES ..........5 WITH ONLY MAIN 5.DIMENSIONS AND CONNECTION POINTS ... -
Page 3: For Service
50°C setting. First tap or outlet SPECIFICATIONS MODEL GS-20W-AU5/6 GS-20W-AU5/6 GS-20W-AU5/6 GS-26W-AU5/6 GS-26W-AU5/6 GS-26W-AU5/6 Gas Type Nat. Gas ULPG Nat. Gas ULPG Gas Input (MJ/h) Inlet Pressure 1.13 min./... -
Page 4: Introduction
INTRODUCTION • This manual provides information necessary for the installation, operation, and maintenance of the water heater. • The model description is listed on the rating plate which is attached to the right side of the casing of the water heater. (Please refer to p. 7.) •... -
Page 5: Accessories
ACCESSORIES Check that the installation manual and screws are included with the unit. Screws × 4 Manual DIMENSIONS AND CONNECTION POINTS GS-20W-AU5/6 GS-26W-AU5/6 (Unit: mm) 15.7 COLD COLD... -
Page 6: Safety Guidelines
SAFETY GUIDELINES Ensure the following safety instructions are read and understood before commencing installation. WARNING • Installation and service must be performed by a qualified installer (for example, a licensed plumber or gas fitter). • The installer (licensed professional) is responsible for the correct installation of the water heater and for compliance with all relevant National, State or local regula- tions. -
Page 7: Installation
INSTALLATION The water heater requires careful and correct installation to ensure safe and efficient operation. This manual must be followed exactly. Read the “SAFETY GUIDELINES” (p.6) and the “IMPORTANT” (p.2) sections at the beginning of this manual. CONFIRM THE APPLIANCE SUITABILITY Check the gas type label and the rating plate for the correct gas type, gas pressure, water pressure and electrical rating for your application. -
Page 8: Selecting Installation Location
SELECTING AN INSTALLATION LOCATION CAREFULLY READ THIS SECTION BEFORE INSTALLING THE WATER HEATER. WHEN A LOCATION FOR INSTALLATION HAS BEEN SELECTED, THESE PRECAUTIONS MUST BE FOLLOWED EXACTLY. WARNING • Every care is taken to warn THE PUBLIC AND THE OCCUPANTS OF THE BUILDING OF ANY RISK OF INJURY that may occur from falling tools, open trenches, water connec- tions or any other general hazard. -
Page 9: Clearances For Outdoor Heater Locations - As5601
CLEARANCES FOR OUTDOOR HEATER LOCATIONS – AS5601 Openable See note 3 window Door See note 2 T = Flue terminal M = Gas meter Shading indicates prohibited I = Mechanical air inlet P = Electricity meter or fuse box areas for flue terminals Minimum clearances Ref. -
Page 10: Gas Connection
GAS CONNECTIONS WARNING Conversion of this unit from natural gas to propane or propane to natural gas cannot be done in the field. Contact your local retailer or distributor to get the correct unit for your gas type. CAUTION 1. Turn off the electric power to the water Power cord heater and manual gas valve located on the outside of the unit before beginning... -
Page 11: Measuring Inlet Gas Pressure And Testing Gas Leakage
MEASURING INLET GAS PRESSURE AND TESTING GAS LEAKAGE The appliance and its gas connections must be tested for leak and the inlet gas pressure must be measured before placing the unit in operation for properly performing and safety. WARNING Measuring inlet gas pressure and testing gas leakage are only to be done by a licensed professional. -
Page 12: Water Connections
WATER CONNECTIONS WARNING Do not reverse the hot outlet and cold Drain plug supply line connections to the Water Heater as this will cause your heater to Filter operate improperly. Hot water outlet Cold water Gate or ball inlet valve on inlet •... -
Page 13: Electrical Connection
10. ELECTRICAL CONNECTION 1. The water heater must be electrically grounded. Do not Weather-proof attach the ground wire to either the gas or water piping. Power Point 2. The water heater requires an AC 240V 50Hz electrical power supply and draws a current of 0.8A. 3. -
Page 14: Remote Controller (Optional Item)
11. REMOTE CONTROLLER (OPTIONAL ITEM) The water heater can be installed with up to three remote controllers. The remote controller has two functions which can adjust the output temperature of hot water and indicate the error code on the remote controller. The remote controllers are optional items. •... -
Page 15: Remote Controller Installation
REMOTE CONTROLLER INSTALLATION 1. Crimp the fork terminals provided to the wires. Use the fork terminals • Minimum 18AWG wire (No polarity) • Maximum 100m long 25 mm 45 mm REMOTE CONTROL WIRING 2. Attach the crimped fork terminals on the end of the wiring to the terminals on the back of the controller. -
Page 16: Connection Of Remote Controller Wiring To The Water Heater
CONNECTION OF REMOTE CONTROLLER WIRING TO THE WATER HEATER 1. Turn off the power supply to the water heater. 2. Remove the front cover from the water heater. There are 3 screws on the front cover. 3. Put the remote control wires through the hole on the bottom of the unit’s casing. 4. -
Page 17: Initial Operation
12. INITIAL OPERATION FOR YOUR SAFETY, READ BEFORE OPERATING: WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. • Check the GAS and WATER CONNECTIONS for leaks before supplying power to the water heater. •... -
Page 18: Normal Operation
• Only change the switches with dark squares. • DO NOT adjust other switches. • DO NOT mistake on-direction for off-direction of the switch. *NOTE: Temperature settings 50 °C models: GS-20W-AU5 40°C 45°C 50°C GS-26W-AU5 60 °C models: GS-20W-AU6 50°C... -
Page 19: With Only Main
WITH ONLY MAIN REMOTE CONTROLLER INSTALLED 1. Press the ON/OFF button. Then ensure the PRIORITY Priority Set temperature lamp is ON and the set temperature is displayed on the lamp display remote controller. MC-110-AU 2. Adjust the set temperature. can change the output temperature of hot water from 37 °C to 50°C when it is connected to GS-20W/26W-AU5 and 37 ON/OFF... -
Page 20: Freeze Prevention
14. FREEZE PREVENTION This unit comes equipped with heaters that prevent the unit from freezing. For this freeze prevention system to operate, there has to be electrical power to the unit. The freeze prevention devices will not work if the electrical power source is disconnected. The unit has been rated for temperatures down to -15 °C in a wind free environment. -
Page 21: Maintenance And Service
15. MAINTENANCE AND SERVICE The water heater should be checked at least once a year or as necessary by a licensed techni- cian. If repairs are needed, any repairs should be done by a licensed technician. The water heater’s lifetime may be extended by frequent maintenance. WARNING Turn off the electrical power supply and close the manual gas control valve and the manual water control valve before servicing. -
Page 22: General Troubleshooting
16. GENERAL TROUBLESHOOTING WATER TEMPERATURE and AMOUNT OF HOT WATER PROBLEM POSSIBLE SOLUTIONS It takes a long time to get hot • The time it takes to deliver hot water from the water heat- water at the taps. er to your taps depends on the length of piping between the two. - Page 23 WATER HEATER PROBLEM POSSIBLE SOLUTIONS Unit does not ignite when water • Is the flow rate over 2.3 l/min ? (p. 18) goes through the unit. • Check for the filter on cold water inlet. (p. 21) • Check for reverse connection and cross connection. •...
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Page 24: Pcb Error Code
17. PCB ERROR CODE The water heater has a self diagnostic function for safety and convenience when troubleshooting. If there is a problem with the installation or the unit, it will display a error code on the remote con- troller or blink the LED on the PCB. Consult the following chart for cause for each error code. When remote controller is not installed When remote controller is installed The error code will be displayed on the... -
Page 25: Wiring Diagram
• Only change the switches with dark squares. • DO NOT adjust other switches. • DO NOT mistake on-direction for off-direction of the switch. *NOTE: Temperature settings 50 °C models: GS-20W-AU5 40°C 45°C 50°C GS-26W-AU5 60 °C models: GS-20W-AU6 50°C... -
Page 26: Operating Safety
20. OPERATING SAFETY FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This water heater does not have a pilot light. It is equipped with an ignition device that automatically lights the burner. - Page 27 DANGER VAPORS FROM FLAMMABLE LIQUIDS WILL EXPLODE AND CATCH FIRE CAUSING DEATH OR SEVERE BURNS. DO NOT USE OR STORE FLAMMABLE PRODUCTS SUCH AS GASOLINE, SOL- VENTS OR ADHESIVES IN THE SAME ROOM OR AREA NEAR THE WATER HEATER. Keep flammable products: Vapors: 1.
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Page 28: Water Flow And Water Temperature
The chart is based on properly sized gas line. GS-26W-AU5/6 Set Temp.(℃) GS-20W-AU5/6 Set Temp.(℃) • The flow rate through the water heater is limited to a maximum of 26.0 or 20.0 l/min. • The temperature setting, along with the supply temperature of the water will determine the flow rate output of the unit.
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