Carrier 50HJ008 Installation, Start-up And Service Instructions Manual

Also see for 50HJ008: Installation, Start-Up and Service Instructions

Contents

193. The indoor coil access panel will be used as the top of thehood. Remove the screws along the sides and bottom ofthe indoor coil access panel. See Fig. 28.4. Swing out indoor coil access panel and insert the hoodsides under the panel (hood top). Use the screws providedto attach the hood sides to the hood top. Use screws pro-vided to attach the hood sides to the unit. See Fig. 29.5. Remove the shipping tape holding the economizer baro-metric relief damper in place.6. Insert the hood divider between the hood sides. SeeFig. 29 and 30. Secure hood divider with 2 screws oneach hood side. The hood divider is also used as the bot-tom filter rack for the aluminum filter.7. Open the filter clips which are located underneath thehood top. Insert the aluminum filter into the bottom filterrack (hood divider). Push the filter into position past theopen filter clips. Close the filter clips to lock the filter intoplace. See Fig. 30.8. Caulk the ends of the joint between the unit top panel andthe hood top. See Fig. 28.9. Replace the filter access panel.10. Install all EconoMi$er IV accessories. EconoMi$er IVwiring is shown in Fig. 31. EconoMi$er2 wiring is shownin Fig. 32.Barometric flow capacity is shown in Fig. 33. Outdoor airleakage is shown in Fig. 34. Return air pressure drop is shownin Fig. 35.ECONOMI$ER IV STANDARD SENSORSOutdoor Air Temperature (OAT) Sensor — The outdoor airtemperature sensor (HH57AC074) is a 10 to 20 mA deviceused to measure the outdoor-air temperature. The outdoor-airtemperature is used to determine when the EconoMi$er IV canbe used for free cooling. The sensor is factory-installed on theEconoMi$er IV in the outdoor airstream. See Fig. 24. The op-erating range of temperature measurement is 40 to 100 F.Supply Air Temperature (SAT) Sensor — The supply airtemperature sensor is a 3 K thermistor located at the inlet of theindoor fan. See Fig. 36. This sensor is factory installed. The op-erating range of temperature measurement is 0° to 158 F. SeeTable 6 for sensor temperature/resistance values.The temperature sensor looks like an eyelet terminal withwires running to it. The sensor is located in the “crimp end”and is sealed from moisture.Outdoor Air Lockout Sensor — The Economi$er IV isequipped with an ambient temperature lockout switch locatedin the outdoor air stream which is used to lockout the compres-sors below a 42 F ambient temperature. See Fig. 24.Table 6 — Supply Air Sensor Temperature/Resistance ValuesTEMPERATURE (F) RESISTANCE (ohms)–58 200,250–40 100,680–22 53,010–4 29,09114 16,59032 9,79550 5,97068 3,74777 3,00086 2,416104 1,597122 1,080140 746158 525176 376185 321194 274212 203230 153248 116257 102266 89284 70302 5522 1/4”DIVIDERBAROMETRICRELIEFCLEANABLEALUMINUMFILTER FILTERHOODFILTERCLIPOUTSIDEAIRFig. 30 — Filter InstallationSIDEPANELINDOORCOILACCESSPANELINDOORCOILACCESSPANELCAULKHERETOPSIDEPANELFig. 28 — Indoor Coil Access Panel RelocationBTOPPANELINDOOR COILACCESS PANEL24 9/16”SCREWHOOD DIVIDERLEFTHOODSIDE40 3/8”Fig. 29 — Outdoor-Air Hood Construction