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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 •...
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 ...
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./...
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.) •...
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...
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.
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.
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.
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.
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...
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.
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 •...
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.
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. •...
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.
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.
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. •...
• 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...
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...
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.
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.
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.
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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. •...
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...
• 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...
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.
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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.
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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