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TAP RANGE 240V 253 -216 208V 220 -187 TABLE 5 THERMOSTAT WIRE SIZE Maximum Transformer Distance VA FLA Wire Gauge In Feet 55 2.3 20 gauge 18 gauge 16 gauge 14 gauge 12 gauge 45 60 100 160 250 TABLE 6 WALL THERMOSTAT AND SUBBASE COMBINATIONS Thermostat Subbase Predominate Features 8403-002 T87F3111 8404-003 Q539A1220 1 stage heat, 1 stage cool System: heat-off-cool Fan: auto-on 8403-041 T8034C --1 stage heat, 1 stage cool System: heat-off-cool Fan: auto-on 8403-019 T874C1760 8404-012 Q674A1001 1 stage cool, 2 stage heat System: heat-auto-cool Fan: auto-on 8403-021 T874D1934 8404-012 Q674A1001 2 stage cool, 2 stage heat System: heat-auto-cool Fan: auto-on 8403-049 1F93-380 --2 stage cool, 2 stage heat 7 day programmingElectronic 8403-043 CM-200 --1 stage heat, 1 stage cool System: heat-off-cool Fan: auto-on Manual 2100-425 Page 9 Manual 2100-425 Page 10 FIGURE 4 WALL-MOUNTING INSTRUCTIONS FIGURE 5 WALL-MOUNTING INSTRUCTIONS MIS-548 MIS-549 SEE FIGURE 3—MOUNTING INSTRUCTIONS SEE UNIT DIMENSIONS, FIGURE 1, FOR ACTUAL DIMENSIONS SEE FIGURE 1 FOR DUCT DIMENSIONS Manual 2100-425 Page 11 FIGURE 6 COMMON WALL-MOUNTING INSTALLATIONS MIS-550 FIGURE 7 ELECTRIC HEAT CLEARANCE Side section view of supply air duct for wall mounted unit showing 1/4 inch clearance to combustible surfaces. MIS-277 WARNING • • • A minimum of 1/4 inch clearance must be maintained between the supply air duct and combustible materials. This is required for the first 3 feet of ducting. It is important to insure that the 1/4 inch minimum spacing is maintained at all points. Failure to do this could result in overheating the combustible material and may result in fire. Manual 2100-425 Page 12 Manual 2100-425 Page 13 FIGURE 8 LOW VOLTAGE WIRING START UP IMPORTANT INSTALLER NOTE For improved start-up performance, wash the indoor coil with a dishwasher detergent. CRANKCASE HEATERS WA611, WA70 and WA721 units are provided with compressor crankcase heat. The WA611, WA70 and WA721 models have a band type heater located around the bottom of the compressor. This heater is controlled by the crankcase heater relay. The heater is only energized when the compressor is not running. Some form of crankcase heat is essential to prevent liquid refrigerant from migrating to the compressor, casing oil pump out on compressor start-up and possible valve failure due to compressing a liquid. The decal in Figure 9 is affixed to all WA611, WA70 and WA721 units detailing start-up procedure. This is very important. Please read carefully. FIGURE 9 START-UP LABEL IMPORTANT These procedures must be followed at initial start-up and at any time power has been removed for 12 hours or longer. To prevent compressor damage which may result from the presence of liquid refrigerant in the compressor crankcase. 1. Make certain the room thermostat is in the "off" position (the compressor is not to operate). 2. Apply power by closing the system disconnect switch. This energizes the compressor heater which evaporates the liquid refrigerant in the crankcase. 3. Allow 4 hours or 60 minutes per pound of refrigerant in the system as noted on the unit rating plate, whichever is greater. 4. After properly elapsed time, the thermostat may be set to operate the compressor. 5. Except as required for safety while servicing – Do not open system disconnect switch. 7961-061 HIGH PRESSURE SWITCH The WA611, WA70 and WA721 models are supplied with a remote reset high pressure switch. If tripped, this pressure switch may be reset by turning the thermostat off then back on again. 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. All three phase units incorporate a phase monitor to ensure proper field wiring. See the Phase Monitor" section later in this manual. Verification of proper rotation must be made any time a compressor is change or rewired. 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 one hour may have a negative impact on the bearing due to oil pump out. NOTE: If compressor is allowed to run in reverse rotation for several minutes, the compressor's internal protector will trip. All three phase ZR3 compressors are wired identically internally. As a result, once the correct phasing is determined for a specific system or installation, connecting properly phased power leads to the same Fusite terminal should maintain proper rotation direction. Verification of proper rotation direction is made by observing tha...

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