Adjust charge in both heating and cooling by following procedure shown on charging tables located on pink charging label on back side of access panel.
NOTE: Unit is to be charged in high capacity only. Charging in low capacity may cause compressor chattering and possible damage to the compressor.
B.COOLING ONLY PROCEDURE
1.Operate unit a minimum of 15 minutes before checking charge.
2.Measure liquid service valve pressure by attaching an accurate gage to service port.
3.Measure liquid line temperature by attaching an accurate thermistor type or electronic thermometer to liquid line near outdoor coil.
4.Refer to charging label for required subcooling tempera- tures.
5.Refer to Table 3. Find the point where required subcooling temperature intersects measured liquid service valve pres- sure.
6.To obtain required subcooling temperature at a specific liquid line pressure, add refrigerant if liquid line tempera- ture is higher than indicated or reclaim refrigerant if temperature is lower. Allow a tolerance of ± 3 °F.
C.HEATING CHECK CHARGE PROCEDURE
To check system operation during heating cycle, refer to the Heating Pump Charging Instructions on outdoor unit. 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.
SS0ID
R38 |
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R33 | R9 |
J1 |
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NOTE: In heating mode, check refrigerant charge only when pressures are stable. If accessory vapor pressure switch is applied and operating conditions cause vapor pressure switch and thereby outdoor fan to cycle, check refrigerant charge in cooling or lower indoor dry bulb temperature. If in doubt, remove charge and weigh in correct refrigerant charge.
NOTE: When charging is necessary during heating season, charge must be weighed in accordance with unit rating plate ±0.6 oz/ft of
EXAMPLE:
To calculate additional charge required for a
25 ft - 15 ft = 10 ft X 0.6 oz/ft = 6 oz of additional charge.
XIII. SYSTEM FUNCTIONS AND SEQUENCE OF OP- ERATION
The outdoor unit control system has special functions. The following is an overview of the
A. COOLING OPERATION
This product utilizes a
NOTE: Outdoor fan motor will continue to operate for one minute after compressor shuts off, when outdoor ambient is greater than 100°F.
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PL3
HPS
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OAT
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A B C D
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R86 R87 C E S O 1 3 0 0 7 8 - 0 0
A00379
