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24). Make sure OAT terminals are up. 12. Place knob, supplied with economizer, on OAT. Set it for 3 F below indoor room thermostat setting. If accessory solid-state enthalpy control (EC) is used instead of the OAT, see instructions shipped with EC for installation and adjustment (see Fig. 24). 13. Connect OAT per Fig. 25. 14. Slide outdoor-air inlet screens into screen track on hood side plates. While holding screens in place, fasten screen retainer to hood using screws provided. 15. Turn on base unit power. Fig. 20 — Horizontal Economizer Installation (90 Degree Rotation) 12 H z z> LU cc D 0) co LU CC CL LU > S o LU 2 . 0 2 in wg . . 900 cfm Example: Given — Return-Air Negative Static Pressure . . . Outdoor Air ............. Determine — Setting = 5 Fig. 22 — Economizer Damper Minimum Position Setting ^III! Fig. 23 - Minimum Position Damper Setting Step 9 — Adjust Evaporator-Fan Speed — Adjust evaporator-fan speed to meet jobsite conditions. Table 3 shows fan rpm at motor pulley settings. Refer to Tables 4-15 to determine fan speed settings. DIRECT DRIVE MOTORS — The evaporator-fan motor factory speed setting is shown on label diagram affixed to base unit. If other than factory setting is desired, refer to label diagram for motor reconnection. BELT DRIVE MOTORS — Fan motor pulleys are factory set for speed shown in Table 1. NOTE: Before adjusting fan speed, make sure the new fan speed will provide an air temperature rise range as shown in Table 1. To change fan speed: 1. Shut off unit power supply. 2. Loosen belt by loosening fan motor mounting nuts. See Fig. 26. 3. Loosen movable pulley flange setscrew (see Fig. 27). 4. Screw movable flange toward fixed flange to increase speed and away from fixed flange to decrease speed. Increasing fan speed increases load on motor. Do not exceed maximum speed specified in Table 1. 5. Set movable flange at nearest key way of pulley hub and tighten setscrew. (See Table 1 for speed change for each full turn of pulley flange.) 13 OAT OR ACCESSORY ENTHALPY CONTROL GRAY-(DCh^E'Ö(E)-ORANGE- Fig. 25 — Wiring Connections for Outdoor-Air Thermostat MOTOR fMWmM PLATE NUTS "S^MWALS Fig. 26 - Belt Drive Motor Mounting Ö&rÖÖÖR-ÄifftHEft^StfÄTi (TERMINALS ARE UP) ;<| HOOD. ¡í' \ HOOD ill Fig. 24 — Outdoor-Air Thermostat/ Enthalpy Control Installation PULLEYS STRAIGHTEDGE MUST BE PARALLEL WITH BELT MOTOR AND FAN SHAFTS MUST BE PARALLEL SETSCREWS MOVABLE FLANGE FIXED FLANGE SINGLE-GROOVE Fig. 27 — Evaporator-Fan Pulley Adjustment 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 mounting. To adjust belt tension: 1. Loosen fan motor mounting nuts. 2. Slide motor mounting plate away from fan scroll for proper belt tension (‘/2-in. deflection with one finger). 3. Tighten motor mounting nuts. 4. Adjust bolt and tighten nut to secure motor in fixed position. 14 Table 3 — Fan Rpm at Motor Pulley Settings UNIT MOTOR PULLEY TURNS OPEN 48LJD/LJE 0 1/2 1 VA 2 2Vz 3 31/2 4 41A 5 005* 1310 1285 1245 1210 1175 1140 1110 1075 1040 1005 970 006 1300 1260 1220 1180 1140 1100 1060 1020 980 940 900 007 1460 1420 1380 1340 1300 1265 1230 1190 1150 1110 1070 ‘Indicates alternate motor. Table 4 — Fan Performance, 48LJE/LJF004 Vertical Discharge Units; Standard Motor (Direct) AIRFLOW (Cfm) LOW SPEED HIGH SPEED 208 230, 460, 575 208 230, 460, 575 ESP Bhp ESP Bhp ESP Bhp ESP Bhp 900 0 46 0.17 0 48 0.19 0.49 0.21 0.51 0.25 1000 0.44 0.20 0.45 0.22 0.47 0.23 0.48 0.27 1100 0.40 0.21 0.42 0.24 0.44 0.25 0.45 0.29 1200 0 32 0.23 0 37 0.25 0.38 0.27 0.40 0.31 1300 0.28 0.24 0 32 0.26 0.32 0.29 0.34 0.32 1400 0.22 0.26 0 25 0.28 0.26 0.30 0.28 0.33 1500 0 16 0 27 0 18 0.33 0.20 0.31 0.21 0.34 LEGEND Bhp — Brake Horsepower ESP — External Static Pressure NOTE: Values include losses for filters, unit casing, and wet coils. Table 5 — Fan Performance, 48LJE/LJF004 — Vertical Discharge Units; Alternate Motor (Direct) AIRFLOW (Cfm) LOW SPEED HIGH SPEED 208 230, 460, 575 208 230, 460, 575 ESP Bhp ESP Bhp ESP Bhp ESP Bhp 900 0.77 0.36 0.83 0 38 0.97 0.48 1.09 0.60 1000 0.70 0 38 0 75 0 41 0.89 0 51 1.01 0.62 1100 0.62 0.41 0 66 0.45 0.80 0 53 0.92 0 64 1200 0 53 0.44 0.58 0 48 0.72 0.56 0 84 0 65 1300 0 44 0 48 0.50 0.50 0.64 0.60 0.75 0.68 1400 0.35 0.50 0 42 0.54 0.56 0.63 0 67 0 69 1500 0.25 0.53 0 33 0.58 0.47 0.65 0.58 0 72 LEGEND Bhp — Brake Horsepower ESP — External Static Pressure NOTE: Values include losses for filters, unit casing, and wet coils. 15 Table 6 — Fan Performance, 48LJD/LJE/LJF005 Vertical Discharge Units; Standard Motor (Direct) AIRFLOW (Cfm) LOW SPEED HIGH SPEED 208 230. 460, 575 208 230, 460, 575 ESP Bhp ESP Bhp ESP Bhp ESP Bhp 1200 0.53 0,44 0 58 0 48 0 72 0.56 0.84 0 65 1300 0 44 0.48 0.50 0.50 0 64 0.60 0.75 0.68 1400 0.35 0.50 0 42 0.54 0 56...

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