1. CHARGING BY SUPERHEAT

2. CHECK AIR FLOW MAKE SURE FILTERS ARE CLEAN
NO RESTRICTIVE FILTERS IN PLACE
IS THE BLOWER WHEEL CLEAN
IS THE EVAPORATOR COIL CLEAN
MAKE SURE YOU HAVE 400 CFM OF AIR FLOW PER TON

3. FIXED ORFICE SYSTEMS
Connect service gauges to base-valve service ports .
Be sure to purge the lines.
Install thermometer to the suction line and insulate for an accurate reading
Refer to the table for proper system Superheat
Add charge to lower Superheat
Remove charge to raise Superheat
Remove gauge lines carefully

4. SUPERHEAT TABLE

5. USING SUPERHEAT TABLE
GET THE OUTSIDE AMBIENT TEMPERATURE IN THE SHADE OF THE CONDENSING UNIT
GET THE RETURN DRY BULB TEMPERATURE AT THE RETURN AIR GRILL
INTERSECT THE 2 NUMBERS
THAT WILL GIVE YOU THE AMOUNT OF SUPERHEAT YOU NEED

6. EXAMPLE
AMBIENT OUTSIDE TEMPERATURE (IN THE SHADE OF THE CONDENSOR) IS 95 DEGRESS
RETURN AIR (DRY BULB) IS 75 DEGREES
INTERSECT THE 2 NUMBERS AND YOUR SUPER HEAT WILL BE 5 DEGREES

7. READING THE SATURATED EVAPORATER TEMPERTURE
ON THE LOW SIDE OF YOUR COMPOUND GAUGES ( BLUE )
THE OUTSIDE READING IS YOUR PRESSURE
THE INSIDE (R 22) IS YOUR SATURATED EVAPORIZING TEMPERTURE

9. INSTALL THERMOMETER INSTALL ON THE SUCTION LINE ( LARGER LINE )
INSULATE THE PROBE FOR AN MORE ACCURATE READING

12. EXAMPLE YOUR LOW SIDE PRESSURE IS 75 PSI
DIRECTLY BELOW THAT NUMBER IS THE SATURATED EVAPORIZING TEMPERATURE, WHICH IS 44 DEGREES
TAKE YOU SUCTION LINE TEMPERTURE, WHICH IS 65 DEGREE

13. EXAMPLE SUBTRACT THE 2 NUMBERS AND THAT HOW MUCH SUPEREHEAT YOU HAVE
=21 SUPERHEAT
WE ONLY NEEDED 5 DEGREES
ADD CHARGE TO LOWER SUPER HEAT
REMOVE CHARGE TO RAISE SUPERHEAT

14. CHARGING BY SUBCOOLING

15. CHECKING SUBCOOLING
Refrigeration liquid is considered subcooled when its temperature is lower than the saturation temperature corresponding to its pressure. The degree of subcooling equals the degrees of temperature decrease below the saturation temperature at the existing pressure.

16. CHECKING SUBCOOLING
Attach an accurate thermometer or preferably a thermocouple type temperature tester to the liquid line as it leaves the condensing unit.
Install a high side pressure gauge on the high side (liquid) service valve at the front of the unit.
Record the gauge pressure and the temperature of the line.
Convert the liquid line pressure gauge reading to temperature by finding the gauge reading in the Temperature – Pressure Chart and reading to the left, find the temperature in F column.
The difference between the thermometer reading and pressure to the temperature conversion is the amount of subcooling.

17. CHECKING SUBCOOLING EXAMPLE: Liquid Line Pressure = 260
Corresponding Temp. = 120 degrees
Thermometer on Liquid line = 109 degrees
To obtain the amount of subcooling subtract 109 degrees from 120 degrees.
The difference is 11 degrees subcooling. The normal subcooling range is 9 -13
Degrees subcooling for heat pumps units , 14 to 18 degrees for straight cool
Units.

18. any questions?
Thank you!