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Manafacture: Bard File size: 499.76 kb File name: b813a5c7-b90d-4a2a-a0d4-ba2eb42babed.pdf Language of manual:

Table 6 shows minimum filter areas and recommended filter sizes. Actual filter sizes can vary with the installation due to single or multiple returns utilizing a filter/grille arrangement or being placed immediately ahead of the indoor coil face in the return air duct. TABLE 6 RECOMMENDED FILTERS Minimum Filter Recommended Model Areas Size P1142A3 608 square inches P1148A1 (2) 16 x20 x1 (4.62 square feet) P1060A1 NOTE: If roof hood accessory is to be used, information on air filters may be found under that heading in this manual. Air filters are supplied as part of that package. FIGURE 7 CONDENSATE DRAIN TRAP MIS-136 Manual 2100-324 Page 9 WIRING – MAIN POWER Refer to the unit rating plate for wire sizing information and maximum fuse size. Each outdoor unit is marked with a “Minimum Circuit Ampacity”. This means that the field wiring used must be sized to carry that amount of current. If field installed heaters are added to the basic unit, a second separate power supply circuit will be required. The heater rating plate located adjacent to the basic unit rating plate will show the appropriate circuit ampacity fuse size, etc. (Also see “Electrical Data” on pages 2 and 3.) All models are suitable for connection with copper wire only. These instructions must be adhered to. Refer to the National Electrical Code for complete current carrying capacity data on the various insulation grades of wiring material. The electrical specifications on page 2 and 3 lists fuse and wire sizes (75°F copper) for all models including the most commonly used heater sizes. The unit rating plate lists a “Maximum Time Delay Fuse” or “HACR” type circuit breaker that is to be used with the equipment. The correct size must be used for proper circuit protection and also to assure that there will be no nuisance tripping due to the momentary high starting current of the compressor. WIRING – 24V LOW VOLTAGE CONTROL CIRCUIT Five (5) wires should be run from thermostat subbase to the 24V terminal board in the unit. A five conductor, 18 gauge copper, color-coded thermostat cable is recommended. The connection points are shown in Figure 8. TABLE 7 THERMOSTAT WIRE SIZE Maximum Distance Transformer VA FLA Wire Gauge In Feet 55 2.3 20 18 16 14 12 45 60 100 160 250 TRANSFORMER TAPS 230/208V, 1 phase and 3 phase equipment employ dual primary voltage transformers. All equipment leaves the factory wired on 240V tap. For 208V operation, reconnect from 240V to 208V tap. The acceptable operating voltage range for the 240 and 208V taps are: TAP RANGE 240 253 – 216 208 220 – 187 NOTE: The voltage should be measured at the field power connection point in the unit and while the unit is operating at full load (maximum amperage operating condition). THERMOSTATS See specific wiring information for the different models, heater KWs, and voltages on pages 14 through 17. TABLE 8 WALL THERMOSTAT AND SUBBASE COMBINATIONS Thermostat Subbase Predominate Features 8403-002 T87F3111 8404-003 Q539A1220 Mercury1 stage cool,1 stage heat, on-autoFan:Heat-off-coolSystem: 8403-041 T8034C1499 .– Mercury1 stage cool,1 stage heat, on-autoFan:Heat-off-coolSystem: 8403-049 1F93-380 .– 2 stage cool2 stage heat, ProgrammableElectronic 8403-043 CM200 .– Mercury1 stage cool,1 stage heat, on-autoFan:Heat-off-coolSystem: Snap Action 8403-048 T8400C1313 .– Mercury1 stage cool,1 stage heat, on-autoFan:Heat-off-coolSystem: Non-ProgrammableElectronic 8403-019 T874C1760 8404-012 Q674A1001 Mercury2 stage heat, 1 stage cool, on-autoFan:heat-auto-coolSystem: IMPORTANT NOTE: Only the thermostat and subbase combinations as shown above will work with this equipment. The thermostat and subbase MUST be matched, and correct operation can be assured only by proper selection and application of these parts. Manual 2100-324 Page 10 Manual 2100-324 Page 11 FIGURE 8 LOW VOLTAGE WIRING MIS-1180 START UP AND OPERATION THREE PHASE SCROLL COMPRESSOR START UP INFORMATION Scroll compressors, like several other types of compressors, will only compress in one rotational direction. Direction of rotation is not an issue with single phase compressors since they will always start and run in the proper direction. However, three phase compressors will rotate in either direction depending upon phasing of the power. Since there is a 50-50 chance of connecting power in such a way as to cause rotation in the reverse direction, verification of proper rotation must be made. Verification of proper rotation direction is made by observing that suction pressure drops and discharge pressure rises when the compressor is energized. Reverse rotation also results in an elevated sound level over that with correct rotation, as well as, substantially reduced current draw compared to tabulated values. Verification of proper rotation must be made at the time the equipment is put into service. If improper rotation is corrected at this time there will be no negative impact on the durability of the compressor. However, reverse operation for over ...

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