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Resumen del manual
5. Charge unit with R-22 refrigerant, using a volumetric- charging cylinder or accurate scale. Refer to unit rating plate for required charge. Be sure to add extra refrigerant to compensate for internal volume of filter drier. II. START-UP ADJUSTMENTS Complete the required procedures given in the Pre-Start-Up section before starting the unit. Do not jumper any safety devices when operating the unit. Do not operate the unit in Cooling mode when the outdoor temperature is below 40° F (unless accessory low-ambient kit is installed). Do not rapid-cycle the compressor. Allow 5 minute between “on” cycles to prevent compressor damage. A. CHECKING COOLING AND HEATING CONTROL OPERATION Start and check the unit for proper control operation as follows: 1. Place room thermostat SYSTEM switch in OFF position. Observe that blower motor starts when FAN switch is placed in ON position and shuts down within 60 sec. when FAN switch is placed in AUTO position. 2. Place SYSTEM switch in COOL position and FAN switch in AUTO position. Set control below room temperature. Observe that cooling cycle shuts down when control setting is satisfied. 3. Place system switch in HEAT position. Set control above room temperature. Observe that compressor, outdoor fan, and indoor blower motors start. Observe that heating cycle shuts down when control setting is satisfied. 4. When using an automatic changeover room thermostat, place both SYSTEM and FAN switches in AUTO positions. Observe that unit operates in Cooling mode when temperature control is set to “call for Cooling” (below room temperature), and unit operates in Heating mode when temperature control is set to “call for Heating” (above room temperature). —15— COMPRESSORACCUMULATOR OUTDOOR COIL INDOOR COIL LCS Bypass Position Metering Position HPS COMPRESSORACCUMULATOR OUTDOOR COIL INDOOR COIL LCS Bypass Position Metering Position HPS LEGEND HPS – High Pressure Switch LCS – Loss of Charge Switch Accurater® Metering Device Arrow indicates direction of flow C00095 Fig. 20—Typical Heat Pump Operation, Heating Mode COMPRESSORACCUMULATOR OUTDOOR COIL INDOOR COIL LCS LEGEND Metering Position Bypass Position HPS HPS – High Pressure Switch LCS – Loss of Charge Switch Accurater® Metering Device Arrow indicates direction of flow C00096 Fig. 21—Typical Heat Pump Operation, Cooling Mode IMPORTANT: Three-phase, scroll compressors are direction oriented. Unit must be checked to ensure proper compressor 3-phase power lead orientation. If not corrected within 5 minute, the internal protector will shut off the compressor. The 3-phase power leads to the unit must be reversed to correct rotation. When turning backwards, scroll compressors emit elevated noise levels, and the difference between compressor suction and discharge pressures may be dramatically lower than normal. B. CHECKING AND ADJUSTING REFRIGERANT CHARGE The refrigerant system is fully charged with R-22 refrigerant and is tested and factory sealed. Allow system to operate a minimum of 15 minutes before checking or adjusting charge. NOTE: Adjustment of the refrigerant charge is not required unless the unit is suspected of not having the proper R-22 charge. The charging label and the tables shown refer to system temperatures and pressures in cooling mode only. A refrigerant charging label is attached to the outside of the service access door. If charge level is suspect in Heating mode, reclaim all refrigerant and charge to nameplate amount. (This information may be obtained from the physical data table also.) IMPORTANT: When evaluating the refrigerant charge, an indicated adjustment to the specified factory charge must always be very minimal. If a substantial adjustment is indicated, an abnormal condition exists somewhere in the cooling system, such as insufficient airflow across either coil or both coils. C. REFRIGERANT CHARGE The amount of refrigerant charge is listed on the unit nameplate and/or the physical data table. Refer to the Refrigeration Service Techniques Manual, Refrigerants Section. D. NO CHARGE Check for leak. Use standard evacuating techniques. After evacuating system to 500 microns, weigh in the specified amount of refrigerant (refer to system data plate). —16— Balance Point Worksheet Building Heat Loss, 1000BTUH Unit Integrated Heating Capacity (x1000BTUH) 70 60 50 40 30 20 10 0 030 036 042 048 060 Based on Indoor Entering Air of 70 F and Rated CFM -10 0 10 17 20 30 40 47 50 60 Outdoor Air Temp (Deg F) C00093rev2 Fig. 22—602A Balance Point Worksheet E. LOW CHARGE COOLING Use Cooling Charging Charts (Fig. 24-33). Vary refrigerant until the conditions of the chart are met. Note that charging charts are different from type normally used. Charts are based on charging the units to correct superheat for the various operating conditions. Accurate pressure gauge and temperature sensing devices are required. Connect the pressure gauge to the service port on the suction line. Mount the temperature sensing device on the suction line and ...
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