COOLING SYSTEMThe cooling section is a complete factory package utilizing anair-cooled condenser. The system is factory-charged withRefrigerant-22. The compressor is hermetically sealed andinternally sprung.The compressors have inherent (internal) protection. If there isan abnormal temperature rise in the compressor, the protectoropens to shut down the compressor.PRELIMINARY OPERATION COOLINGAfter the installation has been completed, the crankcase heaterof the compressor must be energized for at least four hoursbefore starting the unit. After this initial warm-up, thecompressor should be given three false starts (energized justlong enough to make a few revolutions) with a five minute delaybetween each start before being put into full time service.NOTE: Prior to each cooling season, the crankcase heatermust be energized at least 10 hours before the systemis put into operation.COOLING SEQUENCE OF OPERATIONSingle-Stage Cooling:When the thermostat calls for “cooling”, “R” is closed to “G” and“Y1" (wiring schematic) which completes the low voltagecontrol circuit, immediately energizing the compressors,condenser fan motor and blower motor simultaneously.EXTERNAL STATIC PRESSURE DROPDESCRIPTIONRESISTANCE, PAM3/S0.47 0.57 0.66 0.75 0.85 0.94 1.03 1.13 1.23 1.32 1.42Economizer/Motorized Damper1, 3 17.4 20.0 22.3 27.3 32.2 37.2 42.2 49.6 57.0 64.5 74.4Electric Heaters1 5 - 15 KW 10.0 12.4 15.0 17.4 20.0 24.8 29.8 34.7 39.7 47.1 54.620 - 30 KW 15.0 17.4 20.0 22.3 27.3 32.2 37.2 42.2 49.6 57.0 64.5Bottom Duct Connections1 15.0 17.4 20.0 22.3 24.8 27.3 29.8 34.7 39.7 47.1 54.6Cooling Only2 20.0 24.8 29.8 34.7 39.7 44.6 49.6 57.0 64.5 71.9 79.4DESCRIPTIONRESISTANCE, IWGCFM1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000Economizer/Motorized Damper1, 3 0.07 0.08 0.09 0.11 0.13 0.15 0.17 0.20 0.23 0.26 0.30Electric Heaters1 5 - 15 KW 0.04 0.05 0.06 0.07 0.08 0.10 0.12 0.14 0.16 0.19 0.2220 - 30 KW 0.06 0.07 0.08 0.09 0.11 0.13 0.15 0.17 0.20 0.23 0.26Bottom Duct Connections1 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.14 0.16 0.19 0.22Cooling Only2 0.08 0.10 0.12 0.14 0.16 0.18 0.20 0.23 0.26 0.29 0.321Deduct these resistance values from the available external static pressure shown in the Blower Performance Table.2Add these resistance values to the available static resistance in the Blower Performance Table.3The pressure thru the economizer is greater for 100% outdoor air than for 100% return air. If the resistance of the return air duct system is less than 62 Pa (0.25 IWG), the unit will deliver lessairflow during full economizer operation.TABLE 5 - STATIC RESISTANCESMODELBLOWERRANGE(RPM)MOTOR* ADJUSTABLEMOTOR PULLEYFIXEDBLOWER PULLEY BELTHP RPM FRAMESIZESERVICEFACTORPITCHDIA.BORE PITCHDIA.BORE PITCH LENGTH DESIG-NATIONmm in. mm in. mm in. mm in. mm in.DCE 060 850 - 1180 11⁄2 1450 56 1.15 69 - 97 2.8 - 3.8 22 7⁄8 127 5.0 25 1 947 37.3 A36DCE 076 900 - 1200 11⁄2 1450 56 1.15 86 - 112 3.4 - 4.4 22 7⁄8 132 5.2 25 1 973 38.3 A37*All motors have solid bases and are inherently protected. These motors can be selected to operate into their service factor because they are located in the moving air, upstream of anyheating device.TABLE 6 - MOTOR AND DRIVE DATA - Belt-Drive BlowerMODELDCEPOWERSUPPLYVOLTAGELIMITATIONS1 COMPRESSOR COND.FANMOTORFLASUPPLYAIRBLOWERMOTORFLATOTALUNITAMPACITYAMPSMAX.FUSESIZEAMPS2MAX.HACRBREAKERSIZEAMPSMIN.WIRESIZE,AWG3MIN. MAX. FLA LRA036 380/415-3+N-50 342 457 7.1 64 1.8 2.0 12.6 15 15 14048 380/415-3+N-50 342 457 9.6 73 1.8 4.0 17.8 25 25 10060 380/415-3+N-50 342 457 10.3 74 1.8 2.6 17.2 25 25 10076 380/415-3+N-50 342 457 14.1 128 1.8 2.6 22.0 35 35 81 Utilization Range “A” in accordance with ARI Standard 110.2 Dual element, time delay type.3 Based on 60°C copper conductors.TABLE 7 - ELECTRICAL DATA (BASIC UNIT)OPERATION530.26-N1YI12 Unitary Products Group