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manual abstract
Only trained and qualified service personnel should install or service air conditioning equipment. Untrained personnel can perform basic maintenance, such as cleaning and replacing filters. All other operations should be performed by trained service personnel. When working on air conditioning equipment, observe precautions in literature and on tags and labels attached to unit. Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available. Read these instructions thoroughly. Consult local building codes and National Electrical Code (NEC) for special installation requirements. A WARNING Before installing or servicing system, always turn off main power to system. There may be more than one disconnect switch. Turn off accessory heater power if applicable. Electrical shock can cause personal injury. Table 1 — Physical Data UNIT 38AF 007 008 OPER WEIGHT (lb) 300 400 REFRIGERANT* 22 22 COMPRESSOR Oil (pts) 46 8 0 Crankcase Heater Watts 40 40 CONDENSER AIR FAN Propeller; Direct Drive Number...Rpm 1 1075 1 1075 Diameter (in.) 22 22 Motor Hp (NEMA) 'k 'h Nominal Cfm Total 3500 4300 CONDENSER COIL Face Area (sq ft) 10 8 17 7 Storage Capacity (lb)t 168 180 CONNECTIONS (Sweat) Suction (in.) Vk Liquid (in.) 'k CONTROLS Pressurestat Settings High Cutout 426 ± 7 psig Cut-in 320 ± 20 psig Low Cutout 27 + 4 psig Cut-in 67 ± 7 psig FUSIBLE PLUG 200 F "Unit is factory supplied with holding charge only. tStorage capacity of condenser coil with coil 80% full of liquid R-22 at 124 F INSTALLATION Step 1 — Complete Pre-Installation Checks UNCRATE UNIT — Remove unit packaging except for the top skid assembly and wood bumpers, which should be left in place until after unit is rigged into place. INSPECT SHIPMENT — File claim with shipping company if shipment is damaged or incomplete. CONSIDER SYSTEM REQUIREMENTS • Consult local building codes and National Electrical Code (NEC) for special installation requirements. • Allow sufficient space for airflow clearance, wiring, refrigerant piping, and servicing unit. See Fig. I. • Locate unit so that condenser airflow is unrestricted on all sides and above. Refer to Fig. I. • Unit may be mounted on a level pad directly on base channels or mounted on raised pads at support points. See Table 2 for weight distribution based on recommended support points. NOTE: If vibration isolators are required for a particular installation, use data in Table 2 to make proper selection. Step 2 — Rig and Mount the Unit A CAUTION Be sure unit panels are securely in place prior to rigging. RIGGING — These units are designed for overhead rigging only. Traverse base channels are provided with l -1 / 2 in. rigging holes that are located 1-3/4 in. from each end. Rig with top skid packaging assembly and wood bumper strips in place to prevent unit damage by rigging cable. As further protection for coil faces, plywood sheets may be placed against sides of unit, behind cables. Run cables to a central suspension point so that angle from the horizontal is not less than 45 degrees. Raise and set unit down carefully. If it is necessary to roll unit into position, mount unit on longitudinal rails, using a minimum of 3 rollers. Apply force to rails, not unit. If unit is to be skidded into position, place it on a large pad and drag it by the pad. Do not apply any force to unit. Raise from above to lift unit from rails or pad when unit is in final position. Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 11 |4 PC111 Catalog No 563-852 PrintedinUSA Form38AF-1SI Pg1 388 4-85 Replaces: New Tab I3a12a For replacement items use Carrier Specified Parts HEATING & COOLING .... .. 38AF Air-Cooled Condensing Units Step 3 — Complete Refrigerant Piping Connections The evaporator coils on all indoor sections are equipped with a single-circuit coil requiring only one liquid and one suction connection to match 38AF condensing unit connections. Suction connection is 1-1/8-in. sweat with plastic cap; liquid connection is 1/2-in. sweat with plastic cap. Follow standard piping practices. REFRIGERANT PIPING SIZES EQUIVALENT LENGTH OF PIPING — FT COND 0-25 26-50 51 -75 76-100 UNIT Line Size (in. OD) L S L S L S L S 38AFP007 'A 1 Vtj 'k 1 '/s ’/2 1 '/a 'k 1 '/e 38AFC008 'k 1 '/a Vj 1'/b % 1% % 1% L — Liquid Line S — Suction Line NOTES: 1 Pipe sizes are based on a 2° loss for liquid and suction lines 2 Pipe sizes are based on an equivalent length equal to the maximum length of interconnecting piping plus 50 percent for fittings 3 Charge units with R-22 in accordance with unit installation instructions SIZE REFRIGERANT LINES — Consider length of piping required between condensing unit and evaporator, amount of liquid lift, and compressor oil return. See Table 3 and also refer to Part 3 o...