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6
GUIDELINES FOR REMOTE CONDENSER APPLICATION (EWLD J, EWLH and EWLS versions)
Design of remote condenser application, and, in particular, sizing of piping and piping path, is a responsibility of plant
designer.
This paragraph is only focused to give suggestion to plant designer, these suggestions have to be weighted with references
to application peculiarities.
For remote condenser application, such as air-cooled or evaporative condensers, the chillers are shipped with holding
Nitrogen charge. It is important that the unit be kept tightly closed until the remote condenser is installed and piped to the
unit.
Chillers are supplied with filter drier, moisture indicator and expansion valve factory mounted as standard.
It is the contractor responsibility to install the interconnection piping, leak test it and the entire system, evacuate the system
and supply the refrigerant charge.
All piping must be compliant to the applicable local and state codes.
Use refrigerant grade copper tubing only and isolate the refrigeration lines from building structures to prevent transfer of
vibration.
It is important that the discharge lines be looped at the condenser and trapped at the compressor to prevent refrigerant
and oil from draining into the compressors; looping the discharge line also provide grea ter flexibility.
Do not use a saw to remove end caps. This might allow copper chips to contaminate the system. Use a tube cutter or
heat to remove caps. When sweating copper joints it is important to flow dry nitrogen through the system prior to
charging with refrigerant. This prevents scale formation and the possible formation of an explosive mixture of refrigerant
and air. This will also prevent the formation of toxic phosgene gas, which occurs when the refrigerant is exposed to open
flame.
Soft solders are not to be used. For copper-to-copper joints use a phos-copper solder with 6% to 8% silver content. A
high silver content brazing rod must be used for copper-to-brass or copper-to-steel joints. Only use oxy-acetylene
brazing.
After the equipment is correctly installed, leak tested and evacuated, it can be charged with refrigerant and started under
the supervision of Daikin authorized technician.
Charge will be added until the liquid line sight glass is clear, with no bubbles flowing into the expansion val ve. Total
refrigerant charge will depend on the used remote condenser and volume of refrigerant piping
6.1
Installation information for condenserless units
This product is factory charged with N2
The units are equipped with a refrigerant inlet (discharge side) and a refrigerant outlet (liquid side) for the connection to a
remote condenser. This circuit must be provided by a licensed technician and must comply with all relevant European and
national regulations.
6.1.1
Precautions when handling piping
If air or dirt gets in the water circuit, problems may occur. Therefore, always take into account the following when
connecting the water circuit:
1. Use clean pipes only.
2. Hold the pipe end downwards when removing burrs.
3. Cover the pipe end when inserting it through a wall so that no dust and dirt enter.
The discharge and liquid line must be welded directly to the remote condenser piping. For use of the correct pipe diameter
see table of Technical specifications.
Make sure the pipes are filled with N2 during welding in order to protect the pipes against soot.
There should be no blockage (stop valve, solenoid valve) between the remote condenser and the provided liquid injection
of the compressor.
6.1.2
Leak test and vacuum drying
The units were checked for leaks by the manufacturer.
After connection of the piping, a leak test must be performed and the air in the refrigerant piping must be evacuated to a
value of 4 mbars absolute by means of a vacuum pump.
Do not purge the air with refrigerants. Use a vacuum pump to vacuum the installation.