Water heaters for use with Natural and L.P.G. GWH 425 EF Flow Modulated with Electronic Ignition and Power Venting Suitable for heating potable water only - Not approved for space heating purposes (Intended for variable flow applications with steady cold water inlet temperatures) GWH-425-EF-N GWH-425-EF-L Warning: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or death. Do not store or use gasoline or other flammable vapor and liquids in the vicinity of this or any other appliance. Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information consult a qualified installer, service agency or the gas supplier. In the Commonwealth of Massachusetts this product must be installed by a licensed plumber or gas fitter. Upon completion of the installation, these instructions should be handed to the user of the appliance for future reference. What to do if you smell gas · Close gas valve. Open windows. · Do not try to light any appliance · Do not touch any electrical switch; do not use any phone in your building · If you cannot reach your gas supplier, call the fire department. · Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions. · Installation and service must be performed by a qualified installer, service agency or the gas supplier. 6 720 607 017 US (04.10) AL TABLE OF CONTENTS WARNING: Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information consult a qualified installer, service agency or the gas supplier. Upon completion of the installation, these instructions should be handed to the user of the appliance for future reference. In the Commonwealth of Massachusetts this product must be installed by a licensed plumber or gas fitter. FEATURING: Electronic Ignition and Power Venting Specifications ............................................................... Page 3 Rules for safe operation ............................................. Page 5 Locating the Heater .................................................... Page 5 Combustion Air Requirements .................................. Page 6 Mounting the Heater ................................................... Page 7 Venting the Heater ...................................................... Page 8 Gas Connections ...................................................... Page 11 Water Connections ................................................... Page 13 Electrical Connections ............................................. Page 14 Safety before turning on the heater ...................... Page 15 Lighting and Operating instructions ...................... Page 15 Setting water temperature ....................................... Page 15 Maintenance & Service ............................................ Page 16 Trouble Shooting ......................................................... Page 17 Diagram of 425EF .................................................... Page 21 Components and Parts List ..................................... Page 23 Flowchart ..................................................................... Page 24 Warranty ...................................................................... Page 25 WARNING If the information in this manual is not followed exactly. A fire or explosion may result causing property damage, personal injury or death. FOR YOUR SAFETY Do not store or use gasoline or other flammable, combustible or corrosive vapors and liquids in the vicinity of this or any other appliance. WHAT TO DO IF YOU SMELL GAS - Close gas valve. Open windows. - Do not try to light any appliance. - Do not touch any electrical switch; do not use any phone in your building. - Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions. - If you cannot reach your gas supplier, call the fire department. - Installation and service must be performed by a qualified installer, service agency or the gas supplier. 2 6 720 607 017 Principle of Operation: When a hot water faucet is opened, the flow of water through the heater causes the gas valve to open. At the same time a microswitch is activated which sends a spark to the pilot. The flame sensor confirms that the pilot has been lighted and allows the first two burners to ignite. The flame sensor confirms correct activation and all burners ignite. The pilot goes out. The power exhaust system runs as long as the burners are on. The heat exchanger coils absorb the heat generated by the burners and transfer heat to the water. When the hot water faucet is shut off, the gas valve automatically closes and the burners turn off, followed immediately by the exhaust system. Your hot water faucet is an ignition key to turn on the water heater, giving you control over your hot water energy use. Every time you turn off your hot water faucet, the energy consumption for hot water returns to zero. 425 EF LP and 425 EF NG Specifications 425EF NG Gas input 425 EF LP max. 130 000 Btu/hr 125 000 Btu/hr min. 28 000 Btu/hr 28 000 Btu/hr Water Connection 1/2" Thread fitting NPT H x W x D 29 3/4" x 18 1/4" x 8 3/4" Vent 4" Gas Connection 1/2" NPT thread Min. Water Pressure 18 Psi Max. Water Pressure 150 Psi Shipping Weight 50.6 LB Net Weight 44 LB 2.3 GPM at 90° rise 4.6 GPM at 45° rise Min. Water Flow 1/2 gal/min 120V/60Hz 1.2 Amps LP GAS Supply Pressure (before 425 EF regulator) min. 11" W.C. max.14" W.C.* FEATURES - Electronic Pilot Ignition - On/Off switch to activate system - Power Venting with safety shutoff - High Quality Materials for Long Working Life. - Copper heating coils for endless supply of hot water. - Burner output proportional to hot water flow demand for maximum energy efficiency. - Safety flame sensor at pilot burner. - Automatic overheating protection shut-off sensor. - Stainless steel burners with stabilized blue flame. - Built-in corrosion resistant power venter. - Compact space saver: mounts on a wall with two hooks. - Easily removable one-piece cover. - Easy one person installation. - Adjustable water flow restrictor to ensure that water flow demand will not exceed the heating capacity of the heater. Required LP GAS pressure at inlet tap while 425 EF is operating: 10.5" W.C. LP GAS Burner Manifold pressure while 425 EF is operating at maximum input: 9.9" W.C. Natural Gas Supply Pressure (before 425 EF regulator) min.: 7" W.C. max.: 14"W.C.* Required Natural Gas Pressure at inlet tap while 425 EF is operating: 5.7"W.C. Natural Gas Burner Manifold pressure while 425 EF is operating at maximum input: 5.38" W.C. * Inlet gas pressure before 425 EF regulator must not exceed this value. Pressure may need to be adjusted for high altitudes, see page 11. UNPACKING THE 425 EF HEATER This heater is packed securely. The box includes one water connection fitting, a control knob with collar, a gas pressure regulator, a pressure relief valve, an incandescent particle tray, two hooks for hanging the heater, this manual and a warranty registration card. Do not lose this manual as there is a charge for replacement. Please complete and return the enclosed warranty registration card. The FXHOOD horizontal vent terminator is supplied separately from the 425EF water heaters. There is a set of installation instructions in the FXHOOD box. 6 720 607 017 3 FRONT VIEW SIDE VIEW MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS MODEL 425 EF 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. MODEL 425 EF 4 6 720 607 017 GENERAL RULES TO FOLLOW FOR SAFE OPERATION 1. You should follow these instructions when you install your heater. 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.(1,2) INSTALLATION CODES and /or local installation codes. 2. Carefully plan where you install the heater. Correct combustion air supply and flue pipe installation are very important. If not installed correctly, fatal accidents can be caused by lack of air, carbon monoxide poisoning or fire. 3. The place where you install the heater must have enough ventilation. The National Fire Codes do not allow gas fired water heater installation in bathrooms, bedrooms or any occupied rooms normally kept closed. See the section below on locating the heater. 4. You must install your heater so that the venting complies with all requirements. See section on Venting the Heater, pages 6 and 7. 5. The appliance must be disconnected from the gas supply piping system during any pressure testing at pressures in excess of 1/2 Psig (3.5 kPa). The appliance must be isolated from the gas supply piping during any pressure testing of the gas supply piping system at test pressures in excess of 1/2 Psig (3.5Kpa). The appliance and its gas connection must be leak tested before placing the appliance in operation. 6. Keep water heater area clear and free from combustibles and flammable liquids. Do not locate the heater over any material that might burn. Do not install heater over carpeting. 7. Correct gas pressure is critical for the optimum operation of this heater (see specifications on page 2 and chart on page 9). Gas piping must be sized to provide the required pressure at the maximum output of the heater. Check with your local gas supplier, and see the section on connecting the gas supply. 8. Should overheating occur or the gas supply fail to shut off, turn off the gas supply at the manual gas shut off valve on the gas line. 9. Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control that has been under water. 10. When installed, the appliance must be electrically grounded in accordance with local codes or, in the absence of local codes, in accordance with the National Electrical Code ANSINFPA 70 and/or the CSA 22.1 Electrical Code. The heater may still operate even when improperly vented. It will, however, be less efficient and could eventually damage the heater. It could even result in human sickness or death due to oxygen deprivation and carbon monoxide poisoning. 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 the cover. Also, each burner orifice is stamped with a number (79 for LPG and 120 for Natural Gas). Follow the guidelines below: 1. National building codes require that you do not install this appliance in bathrooms, bedrooms, unvented closet or any occupied rooms normally kept closed. 2. Simultaneous operation of other appliances such as exhaust fans, ventilation systems, clothes dryers, fireplaces or wood stoves could create a vacuum effect in your home which could cause dangerous combustion by-products to spill back into your home rather than venting to the outside through the flue. Confirm that your 425 EF is venting properly when all these other appliances are running. See page 6 to test venting performance. Do not obstruct the flow of combustion air to the appliance. This appliance is power vented and uses room air. Note: Electrical power is required to operate the power exhaust. Proper air supply to the appliance is essential. If installed near a clothes dryer it is very important that the dryer be properly vented. Failure to properly vent a dryer could result in a gradual accumulation of lint on the water heater fin coils and burners, leading to a dangerous condition of vent blockage and poor, unsafe combustion. 3. Your hot water lines should be kept short to save energy. It is always best to have hot water lines insulated. WARNING: DO NOT INSTALL IN AN AREA WHERE IT COULD FREEZE. This heater is neither designed for nor approved for outside installation. Drain the heater entirely if freezing temperatures are anticipated in area where heater is installed by disconnecting both the inlet and outlet water connections from the heater (disconnect the outlet flex line from where it connects to the copper heat exchanger). Additionally, remove the drain plug under the water valve. See Fig 1. PROPER LOCATION FOR INSTALLING YOUR HEATER Carefully select the location of your new heater. For your safety and for proper heater operation, you must provide an abundant supply of combustion air and a prop ...