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Natco VW Installation And Operating Instructions Manual
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Contents
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Dial No. 1 2 3 4 5 6 7 8 9+Temp °F 120 128 135 143 150 158 165 173 180+18Figure 20 – Pilot Burners (I.I.D.)Table V – Modu-Snap Temperature SettingsFigure 19 – Control ComponentsManual ResetHigh LimitFlowSwitchT.L. Part # E159 T.L. Part # E130Gasl ModulatingValveLow WaterCutoffT.L. Part # V710 T.L. Part # 679T.L. Part # W343 T.L. Part # W345IW). Each valve has a remote capillary bulbimmersed in a well at the outlet header tomaintain a constant outlet temperature. Thevalves can be staged to give greater flexibilityof control. Consult Table V for desiredtemperature setting.3. High Limit Controls:The manual reset high limit switches are providedas standard equipment on all heaters. Automaticreset switches are optionally provided. Thetemperature sensing bulb of the switch is alwayslocated in the heater outlet. Burners willautomatically shut down whenever overheating ofwater occurs.4. Flow Switch:Standard on all models: Models VW and PW, theswitch is mounted in the outlet “tee” connection.Model IW, the switch is mounted directly in theheader outlet. The flow switch shuts down allburners in case of low water condition or pumpfailure.5. Low Water Cut Off:The low water cut off automatically shuts offheater whenever water level drops below probe.Located at heater inlet (model IW and PW) and atreturn header (model VW).3B. Initial Start-UpBefore placing the heater in operation, be certain thatthe heater is filled with water and all air is purged fromthe system. Once the heater is connected to the gassupply, the automatic safety shutoff devices must bechecked.1. Before beginning the tests, make sure the mainmanual gas valve, and any other heater firingvalves are in the “OFF” position.2. Make sure the heater’s power switch is in the“ON” position. After placing the manual pilot gasvalve in the open position and resetting all safetydevices, (high limit, pressure switch, low- waterHoneywell Johnson ControlsHONEYWELL➩FLOW |
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This manual is suitable for:
Fire Coil IW 1010Fire Coil IW 1200Fire Coil IW 1430Fire Coil IW 1670Fire Coil IW 1825Fire Coil IW 500Fire Coil IW 600Fire Coil IW 715Fire Coil IW 850Fire Coil PW 1010Fire Coil PW 1200Fire Coil PW 1430Fire Coil PW 1670Fire Coil PW 1825Fire Coil PW 500Fire Coil PW 600Fire Coil PW 715Fire Coil PW 850Fire Coil VW 1010Fire Coil VW 1200Fire Coil VW 1430Fire Coil VW 1670Fire Coil VW 1825Fire Coil VW 500Fire Coil VW 600Fire Coil VW 715Fire Coil VW 850IWPWVW
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