Carrier 48TJD008-014 Installation, Start-up And Service Instructions Manual

Also see for 48TJD008: User's information manual

Contents

Step 9 — Adjust Evaporator-Fan Speed — Ad-just evaporator-fan speed to meet jobsite conditions.Table 3 shows fan rpm at motor pulley settings, Table 4shows motor efficiencies and Table 5 gives accessory staticpressure drops. Table 6 shows motor performance. Refer toTables 7-14 to determine fan speed settings. Fan motor pul-leys are factory set for speed shown in Table 1.To change fan speed:1. Shut off unit power supply.2. Loosen belt by loosening fan motor mounting plate nuts(see Fig. 34 and 35).3. Loosen movable pulley flange setscrew (see Fig. 36).4. Screw movable flange toward fixed flange to increase speedand away from fixed flange to decrease speed. Increasingfan speed increases load on motor. Do not exceed maxi-mum speed specified in Table 1.5. Set movable flange at nearest keyway of pulley hub andtighten setscrew (see Table 1 for speed change for eachfull turn of pulley flange).To align fan and motor pulleys:1. Loosen fan pulley setscrews.2. Slide fan pulley along fan shaft.3. Make angular alignment by loosening motor from mount-ing plate.To adjust belt tension (see Fig. 34 and 35):1. Loosen fan motor mounting plate nuts.2. Units 008,009 — Slide motor mounting plate away fromfan scroll for proper belt tension (1⁄2 -in. deflection withone finger) and tighten mounting nuts (see Fig. 34).Units 012,014 — Slide motor mounting plate downwardto tighten belt tension. Secure motor mounting plate nuts.See Fig. 35.3. Adjust bolt and nut on mounting plate to secure motor infixed position.RH — Relative HumidityFig. 30 — Enthalpy Settings forPARABLADE EconomizerFig. 31 — Panels Reinstalled on UnitFig. 32 — Outdoor-Air Hood Installed on UnitCONTROLCURVECONTROL POINTF (C) (APPROX)AT 50% RHA 73 [23]B 70 [21]C 67 [19]D 63 [17]Fig. 33 — Filter Installed on Outdoor-Air Hood16