Trane RTCA 108-216, RTUB 207-224 manual Refrigerant Safety Valves, Water Pressure-Relief Valves

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Installation

Figure 8- RTUB Evaporator water pressure drops

Evaporator Water Pressure Drop

kPa

Water Flow Rate l/s

the values given by the pressure gauges, open one valve and close the other.

Refrigerant Safety Valves

Discharge valves are an option for the RTUB. If installation requires this valve to be mounted, it is mandatory to install two safety valves: one between the compressor and the service valve and the other after the service valve to protect the condenser.

￿CAUTION

The safety valve calibration must not exceed 25 bars.The liquid line must be connected at the inlet to the drier filter which is supplied with a bend blocked by a brazed plug.The connection piping must be correctly dimensioned and installed, because these factors have a substantial impact on the system's performance and reliability.

Water Pressure-Relief Valves

￿CAUTION

To prevent shell damage, install pressure-relief valves in the evaporator water system. Install a water pressure-relief valve in the evaporator inlet piping, between the evaporator and the inlet shutoff valve. Water vessels with close- coupled shutoff valves have a high potential for hydrostatic pressure buildup on a water temperature increase. Refer to applicable codes for relief-valve installation guidelines.

Installing and connecting temperature sensors

General Recommendations Regardless of the type of monitoring sensor required by a particular application, the sensor must always be positioned far enough from the evaporator or condenser to enable the sensor to read a correct temperature for the mixed water.

Install the sensor at 4 o'clock on the water piping to prevent any condensation. When installing standard or optional temperature sensors described in the following paragraphs, comply with the instructions:

Put thermocontact paste in each sensor bulbwell before inserting the sensor. All the temperature sensors installed on site have an identification number and a serial number marked on the part body. Also note that both sensors in each pair have the same serial number.

￿WARNING

To prevent degraded operation due to electrical interference, run the sensor cables in a duct. However, do not lay sensor cables with other cables whose voltage is greater than 30 VAC.

Extension of sensor power cable

A temperature sensor's power cable may not be long enough to reach the UCM. If this is the case for your installation, connect the cable to a junction box installed in a more

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Contents Installation Operation Maintenance Refrigerant Contents Operation Unit Inspection Inspection ChecklistGeneral information Loose Parts Inventory Description of the UnitGeneral data Rtub General data Rtca Storage InstallationInstallation responsibilities Foundation Special Lifting and Moving InstructionsIsolation Clearances Length Width HeightWater Connections Rtub DrainageReleasing the Nitrogen Holding Charge Water Treatment Flow Switch InstallationWater Pressure Gauges Extension of sensor power cable Refrigerant Safety ValvesInstalling and connecting temperature sensors Water Pressure-Relief ValvesElectrical connections performed by the installer Connecting the Rtub with a remote air-cooled condenserDetail of positions of refrigerant sensors 5R56-1 and 5R6-2 Units on the same level Rtca or other manufacturers condenser below the Rtub Size of the liquid line Pressure tests and leak detectionEquivalent pressure drops Discharge lineVacuum pumping Vacuum pump connectionPre-start checkout Installation ChecklistOperation Unit Voltage PhasingStart-up Procedures OverheatingSeasonal Unit Start-up Shutdown proceduresSubcooling System Restart After Extended ShutdownOperation Maintenance For units with the discharge valve option For units without discharge valve optionSome symptoms of an oil over- charged unit Some symptoms of a refrigerant under-charged unitSome symptoms of a refrigerant over-charged unit Checking the separator oil levelR134a Field-Charging Procedure Charge Isolation in the high or low side of the systemLubrication System Filter Replacement ProcedureOil Charging Procedure Measuring the oil levelField Oil-Charging Procedure Factory initial Oil-Charging ProcedureMaintenance Training Safety recommendationsMaintenance contract
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