Carrier WEATHERMASTER 48/50Z030-105 Operation And Service Manual

Also see for 48/50Z030-105: Installation instructions

Contents

Carrier WEATHERMASTER 48/50Z030-105 Operation And Service Manual Manual pdf 122 page image

122Table 95 — Thermistors and Unit Operation Control Pressure TransducersLEGENDFAN STATUS SWITCH — The units can be equipped withan optional fan status switch that will monitor the pressure riseacross the indoor fans.RETURN AIR CO 2 SENSOR — The unit can be equippedwith a return air IAQ CO2 sensor that is used for the demandcontrol ventilation. The sensor is located in the return air sec-tion and can be accessed from the filter access door.BOARD ADDRESSES — Each board in the system has anaddress. The MBB has a default address of 1 but it does havean instance jumper that should be set to 1 as shown in Fig. 26.For the other boards in the system there is a 4-dip switch head-er on each board that should be set as shown below.0 = On; 1 = OffAccessory Control Components — In addition tothe factory-installed options, the units can also be equippedwith several field-installed accessories that expand the controlfeatures of the unit. The following hardware components canbe used as accessories.ROOM THERMOSTATS — The ComfortLink™ controlssupport a conventional electro-mechanical or electronic ther-mostat that uses the Y1, Y2, W1, W2, and G signals. Thecontrol also supports an additional input for an occupied/unoccupied command that is available on some new thermo-stats. The ComfortLink controls can be configured to run withup to 6 stages of capacity. Although the unit can be configuredfor normal 2-stage control, it is recommended that the multi-stage control be used. The room thermostat is connected toTB202.The ComfortLink controls also support the use of spacetemperature sensors and can be used with the T55 and T56sensors. The controls can also be used with CCN communicat-ing T58 room sensor. The T55 and T56 sensors are connectedto TB202 terminals 8, 9, and 10. The T58 sensor is connectedto the CCN connections on COMM board. Whenever a unitequipped with heat is operated without a thermostat, the usermust install the red jumpers from R to W1, and W2 on TB202for the heat function to work correctly.SPACE CO2 SENSORS — The ComfortLink controls alsosupport a CO2 IAQ sensor that can be located in the space foruse in demand ventilation. The sensor must be a 4 to 20 mAsensor and should be connected to TB202 terminals 11 and 12.ECONOMIZER HUMIDITY CHANGEOVER SEN-SORS — The ComfortLink controls support 5 differentchangeover systems for the economizer. These are:• Outdoor enthalpy switch• Outdoor air dry bulb• Differential dry bulb• Outdoor air enthalpy curves• Differential enthalpy• Custom curves (a combination of an enthalpy/dewpointcurve and a dry bulb curve).The units are equipped as standard with an outdoor airenthalpy control. Outside air and return air dry bulb sensorswhich support the dry bulb changeover method are alsosupplied as standard. If the other methods are to be used, then afield-installed humidity sensor must be installed for outdoor airenthalpy and customer curve control and two humidity sensorsmust be installed for differential enthalpy. Installation holes arepre-drilled and wire harnesses are installed in every unit forconnection of the humidity sensors. The ComfortLink controlshave the capability to convert the measured humidity anddry bulb temperature into enthalpy.SENSOR DESCRIPTION AND LOCATION PART NO.ThermistorsCCT Cooling Coil Thermistor input. Provided with factory-option hydronic heat. Located on face of thehydronic heating coil. Consists of 4 thermistors wired into a 2x2 array.HH79NZ039 (4)LST Limit Switch Thermistor. Provided with Staged Gas Control option. Located in the heatingcompartment.HH79NZ034OAT Outside Air Thermistor. Located in top of the return plenum, attached to roof pole. HH79NZ039RATReturn Air Thermistor.Without Economizer: Located on left side base rail in the return plenum.With Economizer: Located on left side face of return damper section in the return plenum.HH79NZ039SAT Supply Air Thermistor. Located in the Supply Fan section, on left side of the fan housing.(May be relocated or replaced when unit is used with CCN Linkage systems; see page 60.)HH79NZ039LAT 1,2,3 Leaving Air Thermistors, provided with Staged Gas Control option. Shipped in the heatingcompartment. Installer must pull out and mount in the supply duct.HH79NZ034 (3)Control Pressure TransducersBPBuilding Pressure. Provided with Modulating Power Exhaust, High-Capacity Power Exhaustand Return Fan options. Located in the auxiliary control box (left-hand side of unit near returnplenum).HK05ZG018DPA Discharge Pressure (refrigerant), Circuit A. Located on compressor A1 high-side connections. HK05YZ007DPB Discharge Pressure (refrigerant), Circuit B. Located on compressor B1 high-side connections. HK05YZ007SPA Suction Pressure (refrigerant), Circuit A. Located on compressor A1 low-side connections. HK05YZ001SPB Suction Pressure (refrigerant), Circuit B. Located on compressor B1 low-side connections. HK05YZ001DSP Duct Static Pressure. Provided with VAV models equipped with VFD or Inlet Guide Vane options.Located in the auxiliary control box (right-hand side of unit near return plenum).HK05ZG010FT_SF Supply Air Cfm (velocity pressure). Provided with factory-option return fan system(sizes 075-105 only). Located in the supply fan compartment, on right side, on vertical post.HK05ZG015FT_RF Return Air Cfm (velocity pressure). Provided with factory-option return fan system(sizes 075-105 only). Located in auxiliary control box (right-hand side, filter access panel).HK05ZG07Outside Air CFMControlOutside Air Cfm Monitor (velocity pressure). Provided with the Outside Air Cfm Control option.Located in auxiliary control box (right-hand side, filter access panel).50ZZ400290 (030-070)50ZZ400289 (075-105)VAV — Variable Air VolumeBOARD SW1 SW2 SW3 SW4RCB 0 0 0 0ECB 1 0 0 0SCB 0 0 0 0CEM 0 0 0 0