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Then, turn adjustment clockwise to desired pressure differential. Every full turn clockwise increases differential by 1.5 psig. 772 8 Table 9 — Physical Data UNIT 38AD024 38AD028 38AD034 38AD044 38AB054 38AB064 38AB084 OPER WT (lb) 1750 1900 2300 ' 3200 3145 3830 4960 REFRIGERANT R-22 Oper Chg (lb)* 28 0 30 5 35 5 66 0 57 0 71 0 132 0 COMPRESSOR Reciprocating Hermetic — 1750 rpm Number 1 1 1 2 2 ? 2 Model 06ED250 06EE266 06EE275 06EA 250 06ED 250 06EA 250 06EE 275 06EA 275 06 EE 275 06EA 299 06EE 299 Cylinders 4 4 6 4 4 4 6 6 6 6 6 Oil (pt) 14 14 19 14 14 14 19 19 19 19 19 Crankcase Htr 1 25 Watts Pro tection Solid State & Ckt Bkr Thermotector & Ckt Bkr Solid State & Ckt Bkr Cap. Control Suction Pressure Cylinder Unloader(s No. 1 Unloader Settings (ps g) Load 76 78 78 88 - 79 - 79 - 79 Unload 58 60 60 66 - 66 - 66 - 66 No. 2 Unloader Settings (psig) Load - 76 76 - 76 - 76 - 76 Unload - 58 58 - 58 - 58 - 58 COND FANS Axic 1 Flow; Direct Drive Number 3 3 3 3 6 S 6 Rpm 1140 1140 :: 1140 1 140 1140 1140 1 140 Diam (in.) 26 30 30 30 30 30 30 Motor Hp (ea) % 1 1 Cfm 18,200 25,200 28,200 31,000 50,400 56,400 62,000 COND COIL Plate Fins; 3-rowt Sections 1 1 1 2 2 2 Face (sq ft) 35 4 39 0 49 6 60 4 78 0 99 2 120 8 Capacity (lb)î 70 77 99 161 154 198 322 ELEC CONTROLS Time Guard Circuit** Pressurestat Du al ... . Cutout High r . Cut-in 375 Psig 275 Psig , Cutout Low - . Cut-in 29 Psig 29 Psig 29 Psig 44 Psig 45 Psig 63 Psig Pressurestat Capacity Control Cutout — — 57 Psig 57 Psig Cut-in - - 87 Psig 87 Psig Pressurestat O 1 Pressure Contro 1 Cutout 5 Psi Above Suction Pressure Thermostat Fan Cycling No. 1 Opens, 70 F; Closes, 75 F No. 2 Opens, 57 F; Closes, 62 F Thermostat Opens Discharge Line 290 F; Closes, 210 F PRESS. RELIEF F u s i b 1 e Plug DISCHARGE LINE 1 1 2 2 2 2 CHECK VALVE * Approximate charge for maximum system capacity Holding charge factory supplied with all units f Unit 38AD044 and 38AB084 have 4~row coil ^Storage capacity at 120 F condensing temp with condenser 80% full of liquid **Short-cyc)e protection Time Guard Circuits BASIC FUNCTIONS OF TIME GUARD CIRCUIT on all units provide for normal (12 to 15 sec) momentary delays after the thermostat closes and before compressor(s) start. The circuit also provides for a longer delay (4 min 45 sec to 5 min 30 sec) in the event of thermostat short cycling or momentary power failure. 38AD024 THRU 044 UNITS In addition to the basic functions, timers in these units provide additional delays for oil pressure switch bypass (40 sec), winter start provision (150 sec) bypass of low-pressure switch and part-winding start (1 sec), if used. 9 772 38AB084 UNIT Timers in this unit provide basic function, plus 40 sec bypass for oil failure switch and 1 sec delay to accomplish part-winding start. For specific sequence for each unit, refer to Timing Charts in Fig. 14. CONTROL SET POINT ADJUSTMENT NUT PRESSURE DIFFERENTIAL ADJUSTMENT SCREW VALVE BODY BYPASS PISTON DIFFERENTIAL SCREW' SEALING CAP (CAP MUST BE REPLACED TO PREVENT REFRIGERANT LEAKAGE) Fig. 13 — Capacity Control Valve 38AD024 THRU 044 UNITS — 5 MIN- -4-45 SEC- )AA Г ÇûÂ2~ )BB| )BB2 1 38AB054 THRU 064 UNITS NOTE- BLACK INDICATES CLOSED CONTACTS 38AB084 UNITS Fig. 14 — Timing Charts Control Circuit Reset 38AD024 THRU 044 AND 38AB084 - Control circuit locks out on these units in the event of oil pressure loss, excessive motor temperatures, or excessive discharge temperatures Reset is accomplished by pushing reset button(s) in unit control box. 38AB054 AND 064 — Loss of oil pressure or excessive motor temperatures cause control circuit lock out on these units Reset is accomplished by pushing reset button on oil failure safety switch(es). All other safety controls on each unit are automatic reset, with restart accomplished through unit timers. Oil Pressure Safety Control (OPS) for each compressor will stop unit if oil pressure differential is not established or maintained at either compressor. If OPS stops unit, determine and correct the cause (such as loss of compressor oil or flooded compressor) before restarting unit. Failure to do so will constitute abuse. Equipment failure due to abuse is not covered by the Warranty To restart unit, push manual reset button i...

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