Daikin Climaa-Flex DWP Series, Инструкция по установке, эксплуатации и обслуживанию, Страница: 44 / 52

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Vacuum Process
For systems that have been open to the atmosphere, proper
dehydration is essential, achieved through an effective vacuum
process. This requires the use of a vacuum pump (distinct from
a compressor) and a vacuometer to accurately measure vacuum
levels (See Figure 31 “Diagram to vacuum and refrigerant charge”)
Procedure:
Access Point Identification: Determine the system’s access points,
utilizing the service valves on the condensing unit for both the low
and high sides. The high pressure switch connects to the smaller
diameter pipe, and the low pressure switch connects to the larger
diameter pipe.
System Draining: This can be executed in two primary ways:
a) Dilution Method:
1. Activate the vacuum pump to establish a vacuum within the
pump itself (register 1 should be closed during this initial step).
2. Open register 1 to allow the system to evacuate until a vacu-
um level of at least 500 microns is achieved.
3. For vacuum measurement, close register 1, open register 2,
and adjust the vacuum gauge to sense the system’s pressure.
4. Upon reaching 500 microns, disconnect the vacuum pump
from the system and open register 3 to introduce nitrogen and
disrupt the vacuum.
5. Seal off the nitrogen supply.
6. Vent the nitrogen via the connection point between the copper
line and register 3.
7. Perform this entire procedure at least two more times, aiming
for a vacuum level of 200 microns on the final evacuation.
To ensure the accuracy of the vacuum measurement, it’s crucial
to isolate the vacuum pump from the system. This can be done by
closing register 1 and allowing approximately 5 minutes to pass for
the system pressure to stabilize, providing a precise reading. If the
vacuum level does not remain stable, it may indicate the presence
of moisture within the system or a potential leak. It’s important to
meticulously check all connections, including the access points
identified (points 1, 3, and valves), for any issues.
b) High Vacuum Method.
This method is utilized with a vacuum pump capable of reaching
a vacuum level below 200 microns through a single evacuation
process. The steps are as follows:
1. Activate the vacuum pump and open register 1 to start the
evacuation process.
2. After a period, isolate the vacuum pump by closing off its con -
nection to the system, then open register 2 to continue with
the process.
3. Once a vacuum level of less than 200 microns is achieved,
aiming for the lowest possible value, the vacuum process is
considered complete. This deep vacuum ensures that mois-
ture and air have been effectively removed from the system,
preparing it for efficient operation.
SERVICE
R-410 Refrigerant Charge
This unit comes pre-charged with the specific quantity of refrigerant
as noted on the serial plate. After conducting a thorough evacuation:
1. Close the manifold valves to isolate the system from the vac-
uum pump, vacuum gauge, and nitrogen supply
2. Swap the nitrogen line for a refrigerant gas line to prepare
for charging.
3. Purge the hose connecting the refrigerant cylinder to the ser-
vice valve to clear any air.
4. Open the service valve linked to the refrigerant line, followed
by the manifold discharge valve.
5. Refer to the unit’s identification labels to determine the cor -
rect amount of refrigerant required for the system.
6. With the system offline, introduce the liquid refrigerant
through the liquid line service valve (the line with the smaller
diameter).
7. Use a scale for accuracy, waiting at least 10 minutes before
powering on the system.
8. After initial charging, close the manifold’s discharge valve,
open the suction valve, and with the system operational, fin -
ish charging with refrigerant in its gaseous state, accounting
for 5% to 20% of the total charge.
9. Monitor the scale to confirm the exact amount of refriger -
ant added. Upon completing the charge, close the manifold
suction valve, detach both suction and discharge hoses, and
close the valve on the pipe.
10. The charging process is now complete, ensuring the system
is correctly filled with R-410 refrigerant as per factory spec -
ifications.
NOTE: The required amount of refrigerant can vary by a
certain percentage due to various specific circumstances
surrounding the installation.
If there is any uncertainty regarding the charge, the recommended
procedure is to reclaim the refrigerant, evacuate the system, and
then recharge. It is important to highlight that the charge can be
adjusted by trained technical personnel.