S-102 Evacuation; S-103 Charging - Daikin DP14UM Service Instructions Manual

SERVICING

S-102 Evacuation

REFRIGERANT UNDER PRESSURE!
Failure to follow proper procedures may cause property
damage, personal injury or death.
This is the most important part of the entire service
procedure. The life and efficiency of the equipment
is dependent upon the thoroughness exercised by the
serviceman when evacuating air (non-condensables) and
moisture from the system.
Air in a system causes high condensing temperature and
pressure, resulting in increased power input and reduced
performance.
Moisture chemically reacts with the refrigerant oil to form
corrosive acids. These acids attack motor windings and
parts, causing breakdown.
The equipment required to thoroughly evacuate the
system is a high vacuum pump, capable of producing
a vacuum equivalent to 25 microns absolute and a
thermocouple vacuum gauge to give a true reading of the
vacuum in the system.
NOTE: Never use the system compressor as a vacuum
pump or run when under a high vacuum. Motor damage
could occur.
Do not front seat the service valve(s) with the
compressor open, with the suction line of the
compressor closed or severely restricted.
1. Connect the vacuum pump, vacuum tight manifold
set with high vacuum hoses, thermocouple vacuum
gauge and charging cylinder as shown.
2. Start the vacuum pump and open the shut off valve
to the high vacuum gauge manifold only. After
the compound gauge (low side) has dropped to
approximately 29 inches of vacuum, open the valve
to the vacuum thermocouple gauge. See that the
vacuum pump will blank-off to a maximum of 25
microns. A high vacuum pump can only produce a
good vacuum if its oil is non-contaminated.
WARNING
WARNING
LOW SIDE
GAUGE
AND VALVE
Evacuation
3. If the vacuum pump is working properly, close the
valve to the vacuum thermocouple gauge and open
the high and low side valves to the high vacuum
manifold set. With the valve on the charging cylinder
closed, open the manifold valve to the cylinder.
4. Evacuate the system to at least 29 inches gauge
before opening valve to thermocouple vacuum gauge.
5. Continue to evacuate to a maximum of 250 microns.
Close valve to vacuum pump and watch rate of rise.
If vacuum does not rise above 1500 microns in three
to five minutes, system can be considered properly
evacuated.
6. If thermocouple vacuum gauge continues to rise and
levels off at about 5000 microns, moisture and non-
condensables are still present. If gauge continues to
rise a leak is present. Repair and re-evacuate.
7. Close valve to thermocouple vacuum gauge and
vacuum pump. Shut off pump and prepare to charge.

S-103 Charging

REFRIGERANT UNDER PRESSURE!
• Do not overcharge system with refrigerant.
• Do not operate unit in a vacuum or at negative pressure.
Failure to follow proper procedures may cause property
damage, personal injury or death.
HIGH SIDE
GAUGE
AND VALVE
WARNING
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