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INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC
INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND
LIQUEFIED PETROLEUM GAS
MODEL 125B LP and 125B NG (Flow Modulated)
WARNING
Suitable for heating potable water only
Not approved for space heating purposes
WARNING
FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS
TABLE OF CONTENTS
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Summary of Contents for AquaStar 125B NG
- Page 1 INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND LIQUEFIED PETROLEUM GAS MODEL 125B LP and 125B NG (Flow Modulated) Suitable for heating potable water only Not approved for space heating purposes WARNING FOR YOUR SAFETY...
- Page 2 FEATURES UNPACKING THE AQUASTAR HEATER...
- Page 3 COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS MODEL 125B / 125B LOW PRESSURE / 125B SOLAR / 125X TOP (A) 12" FRONT (B) 4" BACK 0" SIDES 4" FLOOR (C) 12" FLUE DIAMETER 5" AQUASTAR MODELS 125B / 125BL / 125BS / 125X...
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Page 4: General Rules To Follow For Safe Operation
GENERAL RULES TO FOLLOW PROPER LOCATION FOR INSTALLING FOR SAFE OPERATION YOUR HEATER... -
Page 5: Combustion Air Requirements
COMBUSTION AIR REQUIREMENTS CLEARANCES MOUNTING INSTALLATION... - Page 6 Before installing the unit, be certain you have the correct heater for your type of Gas – Propane or Natural Gas. Identification labels are found on the shipping box, and on the rating plate which is located on the right side panel of VENTING...
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Page 7: Gas Line Sizing
Altitude Natural Gas Liquid Propane inches W.C: inches W.C: 0’ - 2.000 ft 5.7" 10.5" 2.000 ft - 4.500 ft 4.6" 8.4" GAS LINE SIZING GAS CONNECTIONS and Gas Regulator... -
Page 8: Water Connections
WATER CONNECTIONS FOR YOUR SAFETY READ BEFORE LIGHTING THE PILOT SWEATED ASSEMBLY THREADED ASSEMBLY 1/2” ELBOW 1/2” ELBOW S FITTING S FITTING S FITTING PIPE PRV TO PIPE PRV TO APPROPRIATE APPROPRIATE DISCHARGE DISCHARGE... -
Page 9: Lighting Instructions
LIGHTING INSTRUCTIONS MAINTENANCE AND SERVICE SETTING THE WATER TEMPERATURE... -
Page 10: Troubleshooting
TROUBLE SHOOTING The AquaStar 125 burners are activated by a water flow valve. Numerous water related problems can cause this water valve to malfunction such as: Insufficient water flow volume to activate the burners at its minimum flow requirement; Dirt in the water flow valve causing it to malfunction;... - Page 12 It is extremely important for a tankless instantaneous water heater to have the right size gas line to obtain the correct gas pressure Any sign of moisture or corrosion at the joint of the water valve and the gas valve is a sign that the water valve assembly components need to be replaced immediately Do not add any flow restrictor to the shower head.
- Page 13 Diagram of AquaStar 125 B...
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Page 14: Interior Components Diagram And Parts List
- INTERIOR COMPONENTS DIAGRAM AND PARTS LIST... - Page 15 INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 125B...
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Page 16: Installation Checklist
INSTALLATION CHECKLIST GAS LINE SIZE Natural Gas Nominal Iron Pipe Size* 1/2" 3/4" 1" 10’ 40’ 150’ MAXIMUM LENGTH Liquid Propane Semi-rigid Tubing 1/2" 5/8" 3/4" 7/8" 20’ 60’ 150’ MAXIMUM LENGTH RECOMMENDED * Flex tubing greatly reduces capacity and, therefore, is not recommended. Minimum Vent Size* and Height Minimum Diameter Minimum Height**...
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