Carrier 50TCQA Installation Instructions Manual

Also see for 48TC*D: Service and maintenance instructions Installation instructions

Contents

14LOW VOLTAGECONDUITCONNECTORHIGH VOLTAGECONDUITCONNECTORC08637Fig. 20 -- Thru--Base Connection FittingsField--supplied and field--installed liquidtight conduitconnectors and conduit may be attached to the connectorson the basepan. Pull correctly rated high voltage and lowvoltage through appropriate conduits. Connect the powerconduit to the internal disconnect (if unit is so equipped)or to the external disconnect (through unit side panel). Ahole must be field cut in the main control box bottom onthe left side so the 24--v control connections can be made.Connect the control power conduit to the unit control boxat this hole.Units without Thru--Base Connections —1. Install power wiring conduit through side panel open-ings. Install conduit between disconnect and controlbox.2. Install power lines to terminal connections as shownin Fig. 16.All Units —Voltage to compressor terminals during operation must bewithin voltage range indicated on unit nameplate. SeeTable 10. On 3--phase units, voltages between phases mustbe balanced within 2% and the current within 10%. Usethe formula shown in the legend for Table 10, Note 2 (seepage 44) to determine the percent of voltage imbalance.Operation on improper line voltage or excessive phaseimbalance constitutes abuse and may cause damage toelectrical components. Such operation would invalidateany applicable Carrier warranty.Field Control Wiring —The 50TCQA unit requires an external temperaturecontrol device. This device can be a thermostat(field--supplied) or a PremierLink controller (available asfactory--installed option or as field--installed accessory, foruse on a Carrier Comfort Network or as a stand alonecontrol) or the RTU--MP Controller for BuildingManagement Systems using non--CCN protocols(RTU--MP is available as a factory--installed option only).Thermostat —Install a Carrier--approved accessory 2 stageCooling/Heating thermostat according to installationinstructions included with the accessory. The 50TCQmodels do not require a thermostat with an O function tocontrol the reversing valve operation. If using anelectronic thermostat, configure it for “non--heat pump”operation. Locate the thermostat accessory on a solid wallin the conditioned space to sense average temperature inaccordance with the thermostat installation instructions.If the thermostat contains a logic circuit requiring 24--vpower, use a thermostat cable or equivalent single leads ofdifferent colors with minimum of seven leads. If thethermostat does not require a 24--v source (no “C”connection required), use a thermostat cable or equivalentwith minimum of six leads. Check the thermostatinstallation instructions for additional features whichmight require additional conductors in the cable.For wire runs up to 50 ft. (15 m), use no. 18 AWG(American Wire Gage) insulated wire (35_C minimum).For 50 to 75 ft. (15 to 23 m), use no. 16 AWG insulatedwire (35_C minimum). For over 75 ft. (23 m), use no. 14AWG insulated wire (35_C minimum). All wire sizeslarger than no. 18 AWG cannot be directly connected tothe thermostat and will require a junction box and spliceat the thermostat.XCGW2CW2GW1O/B/Y2 Y2RW1RY1 Y1THERMOSTAT(Note 1)(Note 2)Note 1: Typical multi-function marking. Follow manufacturer’s configurationinstructions to select Y2. Do not configure for O output.Note 2: W2 connection not required on units without electric heating.Field WiringCentralTerminalBoardTypicalThermostatConnectionsC09012Fig. 21 -- Typical Low--Voltage Control ConnectionsUnit without thru--base connection kit —Pass the thermostat control wires through the holeprovided in the corner post; then feed the wires throughthe raceway built into the corner post to the control box.Pull the wires over to the terminal strip on the upper--leftcorner of the Central Terminal Board (CTB). See Fig. 22.NOTE: If thru--the--bottom connections accessory isused, refer to the accessory installation instructions forinformation on routing power and control wiring.Heat Anticipator Settings —Set heat anticipator settings at 0.14 amp for the first stageand 0.14 amp for second--stage heating, when available.50TCQA