Assessments - 2, GPA: 4.5
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Facilidade de uso
! Indoor fan motor is on correct speed tap. 2. Set thermostat selector switch to OFF and fan control switch to "Auto" is so equipped. 3. Close electrical disconnects to energize system. 4. Set room thermostat at desired temperature. Be sure set point is below indoor ambient temperature. 5. Set the system switch of the thermostat on COOL (or HEAT if applicable) and fan switch for continuous operation (ON) or AUTO, as desired. There will be a 5 minute short cycle compressor delay on startup. Operate unit for 15-20 minutes, then check the system refrigerant charge. 6. Adjust refrigerant charge per "Adjusting Charge" section. Adjusting Charge Factory charge is shown on the rating label located on the access panel. All split system heat pumps are factory charged for 15 feet of connecting line set and matched indoor fan coil. Nameplate refrigerant charge should initially be adjusted for line set lengths other than 15 feet. For line sets shorter than 15 feet in length, remove charge. For line sets longer than 15 feet, add charge. Oil charge is sufficient for all line lengths. Refrigeration Charge Adjustment Liquid Line Diameter Oz. Per Linear Foot * 3/8" .6 * Factory charge for series is for 15' (ft.) line sets and matched fan coil. Before final adjustment is made to the refrigerant charge, it is imperative that proper indoor airflow be established. Airflow will be higher across a dry coil versus a wet coil. Blower charts are calculated with a dry or wet coil basis. Recommended airflow is 350-450 CFM per ton (12,000 Btuh) through a wet coil. Refer to indoor unit instructions for methods of determining air flow and blower performance. Cooling Cycle Charge Adjustment The optimum method for checking the charge is by weight. However the following methods may be used to confirm the proper charge: Units with Indoor Pistons Units installed with indoor pistons require charging with the superheat method. The following procedure is valid when indoor airflow is within ± 20% of its rated CFM. 1. Operate unit a minimum of 10 minutes before checking charge. 2. Measure suction pressure by attaching a gage to suction valve service port. Do not use compressor suction port. Determine saturation temp from T/P chart. 3. Measure suction temperature by attaching an accurate thermistor type or electronic thermometer to suction line at service valve. 4. Calculate superheat (measured temp. — saturation temp.). 5. Measure outdoor air dry-bulb temperature with thermometer. 6. Measure indoor air (entering indoor coil) wet-bulb temperature with a sling psychrometer. 7. Compare superheat reading at service valve with the chart located on control box cover. 8. If unit has a higher suction line temperature than charted temperature, add refrigerant until charted temperature is reached. 9. If unit has a lower suction line temperature than charted temperature, reclaim refrigerant until charted temperature is reached. 506162-02 Issue 0847 Page 6 of 14 10. Remove charge if superheat is low and add charge if superheat is high. Model Required Subcooling (± I/F) 2HP13 2HP14 4HP13 18 14 10 12 24 9 3 14 30 13 8 17 36 9 14 10 42 11 3 16 48 8 9 7 60 12 -13 NOTE: If a TXV is installed on indoor unit, a hard start kit is required on all models with reciprocating compressors. Refer to the specification sheet for details. Hard start kits are also recommended for areas with utility power lower than 208 Vac. Units with Indoor TXV Units installed with TXV on indoor side, require charging with the subcooling method. 1. Operate unit a minimum of 10 minutes before checking charge. 2. Measure liquid service valve pressure by attaching an accurate gage to service port. Determine saturation temp. from T/P chart. 3. Measure liquid line temperature by attaching an accurate thermistor type or electronic thermometer to liquid line near outdoor coil. 4. Calculate subcooling (saturation temp.— measured temp.). 5. Find the point where required subcooling temperature intersects measured liquid service valve pressure. 6. Add refrigerant if subcooling is lower than table below. Recover refrigerant if subcooling is high. Heating Check Chart Procedure To check system operation during heating cycle, refer to the Heating Check Chart located on back of control box cover. This chart indicates whether a correct relationship exists between system operating pressure and air temperature entering indoor and outdoor units. If pressure and temperature do not match on chart, system refrigerant charge may not be correct. Do not use chart to adjust refrigerant charge. Charge must be rechecked again during the cooling season. Cold Weather Application A cold weather accessory kit may be required for heat pumps operating at ambient conditions below 25/ F. Supplemental heat should be provided for these conditions due to the expected performance degeneration. SYSTEM OPERATION The outdoor unit and indoor blower cycle on demand from the room thermostat. When the thermostat blower switch is in the ON po...