Raypak 1334001 operating instructions Limit Controls, High Limit, Flow Switch

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on-off cycling heater. The valve has a remote capillary bulb immersed in a well, at the header outlet, to main- tain a constant outlet water temperature. When multiple valves are furnished, they can be staged to give greater flexibility of control. Standard factory set- ting is at position 5. Consult the dial setting tag attached to the control for your desired temperature. See Fig. 22 below.

Fig. 22: Dial Setting Tag

Fig. 24: Motorized Gas Valve Location—Model 3001

Limit Controls

High Limit

The heater is equipped with a manual reset High Limit. Push the reset button and set the limit(s) to 30°F–40°F above desired operating temperature. Maximum set- ting is 200°F; other options may be available.

Fig. 25: High Limit

Flow Switch

This dual-purpose control shuts off the heater in case of pump failure or low water condition and is strongly recommended. It is mounted and wired in series to the main gas valve.

NOTE: The flow switch is a safety device and not a control. Do not operate the heater with flows less than the minimums stated in this manual.

Fig. 23: Mechanical Modulating Valve Location—

Models 0724-1336

Fig. 26: Flow Switch

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Contents Raytherm Hot Water Supply Heaters Page Contents If Propane is Present or Suspected Temperature Time to Produce Serious Burn General SafetyTemperature limiting valves are available, see manual Feel water before bathing or show- eringModel Identification Time/Temperature Relationships in ScaldsReceiving Equipment Installation Model Part Number Installation Clearances All Dimensions are in InchesClearances Models 0182-0400 Specifications and DimensionsModel Models MBHMBH GPH Outdoor Water Heaters High Wind Conditions Outdoor Units OnlyVenting Outdoor InstallationsVent Terminal Outdoor Stackless Top Installation Models 0181-0401Indoor Installations Indoor Top Installation Models 0181-0401 Vent Terminal/Indoor Stack Installation Vent Piping Vent PipingLocation Vent Damper InstallationModels 0133 Through 0180 Where Required MountingInstallation Vent DamperGas Supply Connections PlumbingGeneral Gas Pressure Regulator Venting of Diaphragm Gas ComponentsFlow Rates Maximum and Minimum Flow RatesPiping-Domestic Hot Water Supply Heaters Soft Medium HardPiping Diagram-Type WH Unitemp 80 System Relief Valve Pump Time DelayControls-General Electronic IgnitionHigh Limit Flow SwitchLimit Controls Electrical Connections 100% Pilot SafetyHigh and Low Gas Pressure Switches Optional Low Water Cut-Off OptionalLocation of Controls 0824 General START-UP ProceduresBefore Start-Up Initial Start-Up Pump and MotorFor Your Safety Read Before Operating Controls Inspection ProceduresBurners After Start-UpOperation Inspection ProceduresStart-Up Procedures S8610b Ignition Module Should be checked monthly. Takes approximately 15 minutesVisual Inspection Burner AdjustmentHigh Gas Pressure Switch ElectricalCombustion Fan Removal Main burner And Orifice RemovalPilot Removal Electrical-Electronic Ignition IID Intermittent Pilot System Honeywell S8600Mechanical Problem Possible Cause Corrective Action MechanicalWiring Diagrams Wiring Diagram-W2/WH2Wiring Diagram-WH1 0181/0261 Wiring Diagram-WH1 0331/0401 Wiring Diagram-WH1 Wiring Diagram-WH1 Wiring Diagram-WH1 Wiring Diagram-WH1 Tube Cleaning Service Maintenance ProceduresTroubleshooting-Pumps Combination Flame SENSOR/ Igniter and Pilot Burner High Limit or Tankstat Removal Pilot Removal and CleaningHeat Exchanger Re-Assembly Heat Exchanger RemovalTube Replacement Replacement PartsControl Well Replacement Cleaning Flue Gas PassagewaysScope Page