Raypak 155C Unitherm Governor Operation, Internal Automatic BY-PASS Valve

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UNITHERM GOVERNOR OPERATION

The patented Unitherm Governor is a thermostatic mixing valve specifically designed to maintain constant heater internal temperature between 105°-115°F de- spite continually changing flow rates from the filter and changing pool temperatures. This narrow range is needed to prevent damaging condensation on the burn- ers which will occur if the heater runs for any length of time below 100°F. It is also needed to inhibit scale formation in the tubes by maintaining temperatures well below accelerated scaling temperatures.

INTERNAL AUTOMATIC BY-PASS VALVE

In addition to the Unitherm Governor, a built-in automatic by-pass valve is provided in the in/out header. While the Unitherm Governor responds to the changes in water temperature in the heater, the internal by-pass valve automatically responds to changes in water pressure in the piping system. Proper amount of water flow is maintained through the heater under varying pressures dictated by the conditions of the pump and filter.

Fig, # 8078.0

EXTERNAL AUXILIARY BYPASS VALVE (where required)

An auxiliary bypass valve should be used when flow rates exceed 115 GPM (usually a high performance pump size larger than 2 HP will exceed this flow rate). This valve is required to complement the function of the automatic bypass valve, particularly when starting the heater in winter or early spring when the spa or pool temperature is down below 50°F. It also serves to eliminate needless pressure drop through the heater and accompanying reduction in the flow rate to the spa jets, etcetera.

From Heater

To Heater

To Pool

From Pool

Auxiliary Bypass Valve (do not use gate valve)

Fig. # 8150.0

AUXILIARY BYPASS VALVE ADJUSTMENT

To set bypass: With clean filter, adjustment is made by feeling the inlet and outlet pipes at the heater. Outlet pipes should be slightly warmer than inlet and comfort- able to the touch. If pipe is hot, close bypass; if cold, open bypass.

PRESSURE RELIEF VALVE INSTALLATION

To conform to local building codes, it may be necessary to install a pressure relief valve. A 3/4" pressure relief valve having a capacity equal to BTU/HR output of the heater to be installed is recommended for this appliance.

A 3/4" NPT connection is provided in the inlet/outlet header for installation of a pressure relief valve. The valve shall be installed in a vertical position.

PRESSURE RELIEF VALVE

PRV DISCHARGE CONNECTION

INLET/OUTLET HEADER

 

# 8095.0

Fig.

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Contents Versa What to do if YOU Smell GASContents Part TWO INSTALLATION/SERVICE InstructionsSTART-UP Procedures Before START-UPBurners WaterMillivolt System Operating Instructions Electronic Ignition SystemsIID After START-UP Water Pressure SwitchVisual Inspection Maintenance and Care Procedures Basic Tips if Heater will not FirePool & SPA Water Chemistry Automatic Chlorinators and Chemical FeedersCold Weather Operation Pressure Switch Compression Fitting Return HeaderWinterizing the Pool & SPA Heater Installation Instructions General SpecificationsReceiving Equipment Clearances High Wind Conditions Outdoor Units only Combustion AIR Indoor Units only Indoor HeatersVenting Connections Z223.1 Vent PipingGAS Supply Connections Pipe Sizing for GAS ConnectionsPlumbing for Water Connections Location Companion Flange ConnectionsAuxiliary Bypass Valve Adjustment Pressure Relief Valve InstallationUnitherm Governor Operation Internal Automatic BY-PASS ValveElectrical Wiring Millivolt SystemElectronic Intermittent Ignition Device System IID Honeywell Intermittent Ignition DeviceWiring Diagram KEY ANSI/NFPAWiring Diagram Millivolt Units Fig. #2182eWiring Diagram 152148 Model 155 IID Controls / Adjustments / Replacements Temperature ControlsGeneral Location of Controls View of Heater from Front View of Heater from BackFlame ROLL-OUT Safety Switch Pressure SwitchHigh Limits Pilot Removal and Cleaning Burner Drawer RemovalGAS Valve Removal Main Burner and Orifice RemovalUnitherm Governor U.G. Replacement Control Immersion Well ReplacementHeat Exchanger Removal Tube Replacement Procedure Desooting ProcedureCombustion Chamber Removal Refractory Panels TOP ViewTrouble Shooting Guide Electrical Millivolt Electrical Electronic Ignition IID Troubleshooting Honeywell S8600High Voltage Electrical Solid State Thermostat IID Voltage Between 21.5-28.5 Voltage Outside Range 21.5-28.5Replacement Parts List RAYPAK, INCPage Page Page Warranty Exclusion

155C specifications

The Raypak 155C is a versatile and efficient heater designed for both residential and commercial applications. Renowned for its robust construction and reliable performance, this unit is an excellent choice for pool and spa heating as well as for providing comfortable ambient temperatures in enclosed or outdoor spaces.

One of the standout features of the Raypak 155C is its innovative copper heat exchanger, which is designed for maximum heat transfer efficiency. This technology allows for rapid heating capabilities, ensuring that water reaches the desired temperature quickly and effectively. The heat exchanger is also resistant to corrosion, thanks to its durable design, prolonging the unit's life and maintaining performance over time.

Designed with user convenience in mind, the Raypak 155C features an intuitive digital control system. This user-friendly interface allows for easy temperature adjustments and monitoring, giving users precise control over their heating requirements. An integrated diagnostic system is also included, providing real-time feedback on the heater's performance and alerting users to any potential issues, which helps in proactive maintenance.

Incorporating advanced safety features, the Raypak 155C includes a high limit switch and a water flow switch, ensuring safe operation at all times. These safety mechanisms prevent overheating and dry firing, protecting both the heater and the connected plumbing system.

The Raypak 155C is engineered for energy efficiency, meeting and exceeding industry standards. With a compact design, it ensures easy installation and integration into existing setups, making it a favorable choice for various applications. Its quiet operation adds to user comfort, allowing it to be installed in residential settings without causing disturbances.

With a heating capacity of 155,000 BTU, the Raypak 155C is capable of effectively heating larger pools and spas, making it ideal for homes with extensive water features. The heater is designed to run on natural gas or propane, providing flexibility based on user preferences and availability.

Overall, the Raypak 155C combines state-of-the-art technology with practical features, making it one of the top choices for those looking to enhance their pool experience or improve comfort levels in their outdoor areas. Its reliability, efficiency, and user-friendly features make it a valuable investment for any property.
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