Cooling Mode
When the TEST pins are shorted together for more than 1 second, the Anti Short Cycle Timer will be bypassed.
Adjustment of Refrigerant Charge
CAUTION:
This heat pump contains liquid and gaseous refrigerant under pressure.Adjustmentofrefrigerant charge should only be attempted by qualified, trained personnel thoroughly familiar with the equipment and safe responsible refrigerant handling procedures. Under no circumstances should the homeowner attempt to install and/or service this equipment. Failure to comply with this warning could result in equipment damage, personal injury, or death.
•The unit must be charged while both fi rst and second stages are operating.
•To achieve rated capacity and effi ciency the compressor must be exposed to refrigerant for at least 24 hours prior to running and then must be run for a minimum of 12 hours. See Refrigerant Charging Charts (Figures 11 - 14, pages 14 & 15) for Charging in Cooling Mode.
Charging an
1. With the system operating at steady- state, measure the liquid refrigerant pressure in psig at the service valve.
2. M e a s u r e t h e l i q u i d r e f r i g e r a n t temperature (° F) at the service valve.
3.For the temperature measured, determine the required liquid refrigerant pressure from the appropriate charging charts.
•If the pressure measured in step 1 is greater than the required liquid refrigerant pressure determined in step 4, then there is too much charge in the system. Remove refrigerant and repeat steps 1 through 3 until the system is correctly charged.
•If the pressure measured in step 1 is less than the required liquid refrigerant pressure determined in step 4, then there is too little charge in the system. Add refrigerant and repeat steps 1 through 3 until the system is correctly charged.
Charging an R-410A Unit in Heating Mode
1.Evacuate the refr igerant system .
2.Weigh in the proper charge as shown on the unit rating plate and use the Heating Charging Tables 2 & 3 (pages 16 & 17) as a guide.Tables reflect conditions at high speed operation.Unit charge MUST be verifi ed in cooling season.
3.Verify the unit is operating properly according to the System Heating section on page 12.
UNIT MAINTENANCE
WARNING:
To prevent electrical shock, personal injury, or death, disconnect all electrical power to the unit before performing any maintenance or service. The unit may have more than one electrical supply.
Proper maintenance is important to achieve optimum performance from the heat pump. The ability to properly perform maintenance on this equipment requires certain mechanical skills and tools. If you do not possess these skills, contact your dealer for maintenance. Consult your local dealer about the availability of maintenance contracts. Routine maintenance should include the following:
•Inspect and clean or replace air fi lters at the beginning of each heating and cooling season, or more frequently if required.
•Inspect the condensate drain and outdoor coil at the beginning of each cooling season. Remove any debris.Clean the outdoor coil and louvers as necessary using a mild detergent and water. Rinse thoroughly with water.
•Inspect the electrical connections for tightness at the beginning of each heating and cooling season. Service as necessary.
CAUTION:
The unit should never be operated without a filter in the return air system.Replace disposable filters with the same type and size.
•Do not attempt to add additional oil to motors unequipped with oil tubes.The compressor is hermetically sealed at the factory and does not require lubrication.
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