Installation and Operating Instructions for Natco Fire Coil

1 Water Heater ManualDocument 2105 Installationand OperatingInstructions forNatcoFire CoilMIGHTYTHERMM odelsVW, PW and IWVolume Water HeatersSizes 500-1825 MIGHTYTHERMFOR YOUR SAFETYDo not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other Installation , adjustment, alteration, service or maintenance can cause injury or property damage. Refer to thismanual. For assistance or additional information consult a qualified installer, service agency or the gas YOUR SAFETY - WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance.

2 Do not touch any electrical switch; do not use any phone in your building. Immediately call your gas supplier from a neighbor s telephone. Follow the gas suppplier s information. If you cannot reach your gas supplier, call the fire Instructions are to be stored in the pocket provided on the 1. GENERAL INFORMATION Page1A. 31B. Heater Identification .. 31C. Flow Requirements .. 41D. Water Chemistry .. 4 SECTION 2. INSTALLATION2A. Heater 42B. Installation of Indoor Heaters .. 52B-1 Combustion Air Supply.

3 52B-2 Venting .. 62C. Installation of Outdoor Heaters .. 72D. Gas Supply and Piping .. 72E. Electrical 82F. Water Piping of System .. 92G. Water 92H. Pump Performance and Installation .. Pressure .. 142J. Tank 142K. Two-Temperature 17 SECTION 3. OPERATION3A. Controls General .. 173B. Initial 193C. To Start Up System .. 193D. To Turn Off Heater .. 203E. To Shut Down System .. 20 SECTION 4. MAINTENANCE .. 20 SECTION 5. TROUBLESHOOTING ANDANALYSIS OF SERVICE PROBLEMS .. 21 TABLES AND FIGUREST able 4 Table Recommended Air SupplyTo Heater.

4 6 Table III. Gas Piping Sizes .. 8 Table IV. Pump Performance Requirements .. 14 Table ValveTemperature 18 Figure 1 Boiler 3 Figure 2 Typical Heater Installation with Basefor Combustible Floors (Ex. A) .. 5 Figure 3 Typical Heater Installation with Basefor Combustible Floors (Ex. B) .. 5 Figure 4 Typical Heater Installation with Basefor Combustible Floors (Ex. C) .. 5 Figure 5 Installation on Concrete Blocksor Tile .. 5 Figure 6 Alcove 6 Figure 7 Incorrect Outdoor Installation .. 7 Figure 8T-Fitting Sediment Trap Installation .

5 8 Figure 9 Pressure Relief Valve Location .. 9 Figure 10 Tempering Valve 9 Figure 11 Hot Water Supply System forModels VW and PW .. 11 Figure 12 Hot Water Supply System usingModel PW with Dual Tanks,Building Loop Return andCirculating 12 Figure 13 Split System Piping for Model IW .. 12 Figure 14 Dual Installation Piping Diagramfor Model IW .. 13 Figure 15 Single Installation PipingDiagram for Model IW .. 13 Figure 16 Two Temperature Hot WaterSupply System (Model VW orPW) Vertical/Horizontal 15 Figure 17 Two Temperature Hot WaterSupply System w/VerticalTank for Models VW and PWWater Heaters.

6 16 Figure 18 Controls Location .. 16 Figure 19 Control Components .. 18 Figure 20 Pilot Burners ( ) .. 18 Figure 21 Gas Manual Valves .. 19 Figure 22 Pilot Safety Relay .. 20 Figure 23 Main Burner Flame Pattern .. 20 Section 1 General manual provides information for theinstallation and operation of Natco volume waterheaters. It is strongly recommended that allapplication and Installation procedures be reviewedcompletely before proceeding with the the Natco factory, or local factoryrepresentative, with any problems or questionsregarding this equipment.

7 Experience has shown thatmost problems are caused by improper accessory items are shipped in separatepackages. Verify receipt of all packages listed on thepackage slip. Inspect everything for possible damageupon delivery, and inform the carrier of any shortagesor impairments. Any such claims should be filed withthe carrier. The carrier, not the shipper, is responsiblefor shortages and damage to the shipment whethervisible or WARNING:All volume water heaters must be installed inaccordance with the procedures outlined in thismanual.

8 The warranty does not apply to heaters notinstalled or operated in accordance with theseprocedures. Consult local building and safety codesbefore proceeding with work. The Installation mustconform to the requirements of the authority havingjurisdiction or, in the absence of such requirements, tothe latest edition of the National Fuel Gas Code;ANS1 , National Electrical Code ANSI/NFPA70 and/or in Canada CAN1-B149 1 Boiler ConfigurationWhen required by the authority having jurisdiction, theinstallation must conform to American Society ofMechanical Engineers safety codes for controls andsafety devices for automatically fired heaters , and in Canada CGA Any modification tothe water heater, its gas controls, gas orifices, wiringor draft diverter may void the Natco warranty.

9 If fieldconditions require such modifications, consult IdentificationConsult rating plate on the heater. The followingexample simplifies the heater identification. 1 2 3 4 5 6 P W 1 6 7 0 I N 09 L(1)Basic heater model.*(2)Input rate X 1000 BTU/hr.(3)Indoor (I) or Outdoor (E) Installation .(4)Gas type: Natural (N) or Propane (P).(5)Ignition system: (09) or continuous pilot(16).**(6)Firing rate: On/Off (C), 2-stage (K), 4-stage (L),or Mech. Mod (H).*Model VW water heaters for use with separatestorage tank.

10 There must be a field installed pump tocirculate water between the heater and the storagetank.*Model PW water heaters are basically the same asthe VW series except that the PW heaters come withintegrally mount pumps.*Model IW water heaters are tankless instantaneousheaters, complete with mount pump for use inapplications having a suitable diversity in heater load.**Special Options: (04) 115 volts or (08)IRI ControlsNatco commercial water heaters are available intwo models: an indoor version and an outdoorversion. Both are available from the factory.