Installation
convenient position. Plug the sensor cable and the cable connected to the control panel into the junction box.
The shielded cable can be cut to the required length.
Note:To lengthen the sensor's power cable, use 0.75 to 1.25 mm² conductors, 600V.The cable used between the junction box and the control panel must either be shielded or in a duct. If a shielded cable is used, make sure it is not used with other cables carrying 30 V or more.
Evaporator leaving water temperature sensor 5R51 (standard) Install this temperature sensor in the evaporator's leaving water piping system.To install it correctly, refer to the general recommendations. Connect this sensor to terminals
Evaporator entering water temperature sensor 5R52 (standard) Install this sensor in the evaporator water piping.To install it correctly, refer to the general recommendations. Connect this sensor across terminals
Condenser sensors
If an RTCA condenser is used with an RTUB, the sensors required are installed on the RTCA.To install them
correctly, refer to the general recommendations. Connect the outside air sensor 5R3 to terminals 1 and 2 on terminal board 1. Connect the condenser sensor
If the condenser is not an RTCA, ambient temperature and condenser temperature sensors must be connected to the RTUB to monitor it. The ambient temperature sensor must be installed in a position which represents most accurately the condenser's surrounding environment. It must not be exposed to sunlight or precipitation. Ensure that the sensor is not located in the flow of recycled air from the condenser discharge.The condensation temperature sensors must be installed on the refrigerant piping at the place where it leaves the condenser to enter the sub- cooler. It is necessary to install a condenser temperature sensor on each refrigerant circuit.This sensor must be fixed in compliance with the method used to attach the bulb for a thermostat expansion valve.This sensor can be fixed outside the piping if it is sufficiently insulated with insulation capable of
withstanding high temperatures without degradation.
CAUTION
A defect in fixing or insulating the condensation sensors may cause incorrect adjustment and/or damage to the compressor.
If the sensor cannot be mounted in the place where the saturated gas enters the
CAUTION
To prevent interference, separate the sensor cables from the power cables.
Electrical connections performed by the installer
All wiring must comply with local codes. Specific electrical schematics and connection diagrams are shipped with the unit.
CAUTION
To avoid corrosion and overheating at terminal connections, use copper conductors only. Failure to do so may result in damage to the equipment. Do not allow conduit to
Figure 9: UCM water temperature sensor installation
interfere with other components, structural members or equipment. Control voltage (110 V) wiring in
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conduit must be separate from conduit carrying low voltage (<30 V) wiring.To prevent control malfunctions, do not run low voltage wiring (<30 V) in conduit with conductors carrying more than 30 V.
Connecting the RTUB with a remote air-cooled condenser
The RTUB unit is shipped with a holding nitrogen charge and a separate oil charge.The RTCA condenser is designed to operate with the RTUB unit.To ensure
1 | In | 5 | Compression fitting |
2 | Out | 6 | Fitting body |
3 UCM sensor | 7 Clamping nut | ||
4 | ¼" NPT coupling |
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optimum operation and performance, the RTUB must be installed with the RTCA condenser. If
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