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INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC
INSTANTANEOUS TYPE WATER HEATER FOR USE WITH NATURAL AND
LIQUEFIED PETROLEUM GAS
MODEL 125FX LP and 125FX NG
(Flow Modulated with Electronic Ignition and Power Venting – a Type III Category Appliance)
Suitable for heating potable water only
Not approved for space heating purposes
Intended for variable flow applications with steady cold water inlet temperatures
WARNING
If the information in this manual is not followed
exactly. A fire or explos
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Principle of Operation: AquaStar 125FX LP and 125FX NG Specifications When a hot water faucet is opened, the flow of water through AQ125FXNG AQ125FXLPG the heater causes the gas valve to open. At the same time a microswitch is activated which sends a spark to the pilot. max. 130 000 Btu/hr 125 000 Btu/hr Gas input The flame sensor confirms that the pilot has been lighted min. 28 000 Btu/hr 28 000 Btu/hr and allows the first two burners to ignite. The flame sensor confirms correct activation and
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FRONT VIEW SIDE VIEW MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS MODEL 125FX TOP (A) 12 " FRONT (B) 4 " BACK 0 " * SIDES 4 " FLOOR (C) 12 " ** VENT DIAMETER 4 " * On a combustible wall surface the unit should be mounted away from the wall to provide adequate clearance of the vent pipe. See page 5 for instructions. ** Some local codes require 18” in garage installations AQUASTAR MODEL 125FX 3 D084_089
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The heater may still operate even when improperly vented. GENERAL RULES TO FOLLOW It will, however, be less efficient and could eventually damage FOR SAFE OPERATION the heater. It could even result in human sickness or death due to oxygen deprivation and carbon monoxide poisoning. 1. You should follow these instructions when you install Before installing the unit, be certain you have the correct your heater. In the United States: The installation must heater for your type of Gas – Propane or Nat
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COMBUSTION AIR REQUIREMENTS CLEARANCES The AquaStar water heater holds cold water in its copper The Aquastar 125FX is design certified for installation on a heat exchanger and brass water valve when not in use. combustible wall and for installation in an alcove or closet Because of this, any cold air that comes in through the with the minimum clearances to combustible and non - unit’s vent pipe is capable of freezing these components. combustible construction listed below This Installation Manua
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Minimum vent size diameter must be 4”. The appliance must be located as close as practicable to a vent terminal. Maximum vent length is 15 feet (4.6m) with two 90- WALL STUDS degree elbows. This unit may be directly connected to an approved vent termination with a 90-degree elbow. The 13 ¼” vent pipe connections must be secured to each other with SUPPORT BOARD a minimum of 4 sheet metal screws per connection, and all seams must be sealed with an approved high temperature silicone sealant and alu
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4”single wall venting only. Use stainless steel (AL29-4C) or galvanized pipe of 26 minimum gauge must be used. Each connection must be properly sealed. Approved Vent Terminal (FXHOOD or other approved terminal) The FXHOOD is design approved with the Aquastar 125FX and has a built in back draft flapper to prevent negative air from freezing the Aquastar – see Fig. 5 for restrictions in loca- tion of vent terminal. HORIZONTAL SIDE WALL * Maximum 15 feet with 2 elbows. Deduct 5 feet for each additi
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SOFFIT 7’ MINIMUM ABOVE PUBLIC WALKWAY The approved vent terminal must be installed so that flue gases will not jeopardize people, overheat combustible structures or enter into buildings, and so that proper clearances are maintained (See Fig 5). a) The vent terminal shall not be less than 7 feet above a public walkway. b) The vent terminal shall terminate at least 3 feet above any (mechanical) air inlet within 10 feet. c) The vent terminal shall not be within a 6-foot radius from a gas meter or
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GAS PIPING, CONNECTIONS and Gas Regulator Before connecting the gas supply, check the rating plate on the right side of the front cover to be sure that the heater is rated for the same gas to which it will be connected. In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFPA 54. In Canada: The Installation should conform with CGA B149 INSTALLATION CODES and /or local installation codes. GAS LINE SIZING FO
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It is strongly recommended that the natural gas pipe line WARNING: The heater must be disconnected from be 3/4" for the entire distance. If the maximum length is the gas supply piping system during any pressure testing above 40 feet, use 1" line. Flexible tubing is NOT of that system at test pressures in excess of .5 psig. recommended, but if it is to be used, oversize it. With LP The water heater must be isolated from the gas supply gas installation, the recommended sizes are 5/8" up to a pipin
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- Typical setups are shown below with the pressure relief Connecting the pressure relief valve (PRV) valve attached. The pressure relief valve is supplied with the heater, and should only be fitted on the hot water The listed pressure relief valve supplied with the heater must outlet as shown. The cold water inlet setup will be be installed at the time of installation. Should a discharge identical to diagrams below but without the pressure relief line be added to the PRV no valve is to be placed
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OPERATING INSTRUCTIONS 6. Turn the hot water faucet on to the minimum flow required to activate the heater. The automatic ignition system Before operating the heater, make sure that the system is first ignites the safety pilot burner which then ignites the filled with water. main burner in about 4 seconds. The power exhaust will then activate. Open the cold water inlet supply to the heater fully. 7. The pilot flame will extinguish 10-30 seconds after the Open a hot water faucet to permit the wat
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between will give various temperatures between 140° and Pilot Flame: The pilot flame should burn with a clean, 95°F at various flow rates between 2.0 and 4.0 gallons per sharp, blue flame and should resemble the diagram in Fig. minute. The position you select on the temperature selector 13. If the flame is soft and yellow, the pilot burner orifice dial will depend on the temperature of the incoming water may need to be cleaned or replaced. The pilot flame should (50°F is average in the U.S.). In
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3. Water flow is not sufficient to activate heater. Water flow rate at faucet is below minimum flow needed to activate heater. When temperature adjustment knob is turned all the way clockwise, the AquaStar model 125FX requires 1/2 gallon per minute flow to activate the heater. As a reference, this is a flow which would fill a quart jar in 30 seconds. If the temperature adjustment knob is turned fully counterclockwise, a flow rate of 1.1 gallons/minute is required to activate the heater. 4. Bad f
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PILOT SPARKS CONTINUOUSLY WITH NO WATER Mineral deposits can eventually (3-5 years in hard water RUNNING areas) corrode the water valve parts to a point where they will need replacing. Any sign of moisture at the bleed 1. Microswitch needs adjustment hole is a sign that the water valve needs to be If no water is running, but pilot electrode continuously replaced immediately. sparks, the microswitch screw to the water valve needs adjustment. See Figure 15. 10. Loose connection at the ECO Ignition
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WATER IS TOO HOT HOT WATER TEMPERATURE FLUCTUATES / UNIT DEACTIVATED 1. Temperature Selection too high Turn the temperature adjustment knob counter-clockwise 1. Unbalanced pressure in waterlines (to the left) to lower the maximum water temperature. The added restriction caused by the Aquastar in the hot Note: This will increase the activation flow rate. water system can result in uneven pressures between the cold and the hot. In such cases when mixing cold water at 2. Inlet water temperature is
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Fig. 17 - Diagram of AquaStar 125FX 14 1 3 2 4 5 6 9 13 7 10 8 11 12 1. Heat exchanger 8. Power cord 9. on/off switch 2. Pilot assembly 10. Temperature adjustment selector 3. Burner manifold gas 11. Microswitch pressure test nipple 12. Gas inlet gas pressure test nipple 4. Main gas burner 5. Pilot gas tubing 13. Electric box 14. Exhaust Fan 6. Gas valve 7. Electronic control box 17
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Fig. 18 INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 125FX 1 Front Cover 8 705 421 255 2 AquaStar Decal 8 701 103 074 3 Plastic lower snap-on 8 705 506 451 4 Temperature adjustment knob complete 8 702 000 219 5 Temperature adjustment knob 8 702 000 111 6 Exhaust fan assembly 8 707 204 023 7 Draft diverter 8 705 505 451 8 Fan protection 8 701 302 164 9 Flue gas safety device 8 707 206 185 10 Heat Exchanger 8 705 406 235 11 Hot water pipe 8 700 705 556 12 Washer 8 710 103 045 13 Overheat sensor (ECO
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Fig. 18 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 19
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MAINTENANCE TABLE see pages 13 - 14 ES VERY YEARES VERY 2 YEAR EVERY 3-5 YEAR LUBRICATE WATER VALVE † REBUILD WATER VALVE † INSPECT WATER FILTER SCREEN † INSPECT PILOT ASSEMBLY † INSPECT VENT ASSEMBLY † INSPECT MAIN BURNER † Replacement Parts available from North American Distributor CONTROLLED ENERGY CORP. VULCANO Termodomésticos S.A. 340 Mad River Park Estrada de Cacia Waitsfield, Vermont 05673 3801 - 856 Aveiro - PORTUGAL Phone 800-642-3111 Fax (802) 496-6924 www.controlledenergy.com techsupp
