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Hersteller: Carrier Dateigröße: 1.24 mb Dateiname: Unterrichtssprache:

Stop unit and check compressor oil level. Add oil only if necessary to bring oil into view in sight glass. If oil is added, run unit for additional 10 minutes. Stop unit and check oil level. If level is again low, add oil only after determining that piping system is designed for proper oil return and that the system is not leaking oil. Check the operation of all safety controls. Replace all service panels. Be sure that control panel door is closed tightly. Table 8 — Charging Data (R-22) UNIT REFRIG CHG (lb) REFRIG STORAGE CAP. (Ib)t Sub-cooler Coil* 38AD024 8 70 38AD028 8 77 38AD034 7 99 38AD044 15 161 38AB054 12 154 38AB064 10 198 38AB084 21 322 full of *For maximum system capacity without receiver fAt 120 F condensing temp with condenser 8C liquid NOTE Values shown do not include charging requirements for cooling coils and piping SERVICE Capacity Control is by either one or two suction pressure actuated unloaders. Each controls two cylinders. Unloaders are factory set (see Table 9) but may be field adjusted. No. 1 unloader is on cylinder bank on same side of compressor as terminal box. CONTROL SET POINT (cylinder load point) is adjustable from 0 to 85 psig. To adjust, turn control set point adjustment nut (Fig. 13) clockwise to its bottom stop. In this position, set point is 85 psig. Then, turn adjustment counterclockwise to desired control set point. Every full turn counterclockwise decreases set point by 7.5 psig. PRESSURE DIFFERENTIAL (difference between cylinder load and unload points) is adjustable from 6 to 22 psig. To adjust, turn pressure differential adjustment screw (Fig. 13) counterclockwise to its back stop position. In this position, differential is 6 psig. 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 provisi...

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