Carrier 50TCM Series Installation, Operation And Maintenance Manual

Contents

Field Control Wiring – The 50TCM unit requires an external temperature control device. This device can be athermostat (field--supplied) or a PremierLink controller (field--installed accessory, for use on a Carrier ComfortNetwork or as a standalone control)Thermostat – Install a Carrier--approved accessory thermostat according to installation instructions included with theaccessory. Select a two--stage cooling thermostat. Locate the thermostat accessory on a solid wall in the conditionedspace to sense average temperature in accordance with the thermostat installation instructions.If the thermostat contains a logic circuit requiring 24—v power, use a thermostat cable or equivalent single leads ofdifferent colors with minimum of seven leads. If the thermostat does not require a 24--v source (no “C” connectionrequired), use a thermostat cable or equivalent with minimum of six leads. Check the thermostat installationinstructions for additional features which might require additional conductors in the cable.For wire runs up to 15 m (50 ft.), use no. 18 AWG (American Wire Gage) insulated wire (35_C minimum). For 15 to 23m (50 to 75 ft.), use no. 16 AWG insulated wire (35_C minimum). For over 23 m (75 ft.), use no. 14 AWG insulatedwire (35_C minimum). All wire sizes larger than no. 18 AWG cannot be directly connected to the thermostat and willrequire a junction box and splice at the thermostat.Fig. 8 Typical Low-Voltage Control Connections3.0 – START-UP INSTRUCTIONSPRIOR to unit start-up use the following instructions and start-up checklist provided on the last page.3.1– Unit PreparationCheck that unit has been installed in accordance with these installation instructions and all applicable codes.3.2 – Internal WiringCheck all electrical connections in unit control boxes; tighten as required.3.3 – Compressor MountingCompressors are internally spring mounted. Do not loosen or remove compressor hold down bolts.3.4 – Refrigerant Service PortsEach refrigerant system has a total of 2 Schrader type Service gage ports. One port is located on the suction line,one on the compressor discharge line, and one on the liquid line. In addition Schrader-type valves are locatedunderneath the pressure switches. Be sure that caps on the ports are tight.Page 16