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Functional Diagrams ESIE05-03

1–30 Part 1 – System Outline

Precautions on

refrigerant piping

P Do not allow anything other than the designated refrigerant to get mixed into the freezing cycle (air,

moisture,... ). If any refrigerant gas leaks while working on the unit, ventilate the room thoroughly

immediately.

P Use R410A only when adding refrigerant.

P Make sure all installation tools are designed for use on R410A refrigerant to withstand the

pressure.

P Vacuum pump. Use a 2-stage vacuum pump with a non-return valve. Make sure the pump oil does

not flow oppositely into the new system while the pump is not working. Use a vacuum pump which

can evacuate to -100.7 kPa (5 Torr, -755 mmHg).

P Check welded connections for gas leaks, if the local piping has welded connections.

Notes for Twin,

Triple and Double

Twin

P Main piping (L1) can be re-used, size up & size down is allowed (see further in this section for

restrictions).

P Re-use of branch piping is not allowed.

P Branch piping (L2~L7) can be re-used, but standard pipe size only.

Selection of piping

material

P Construction material: phosphoric acid deoxidized seamless copper for refrigerant.

P Temper grade: use piping with temper grade in function of the pipe diameter as listed in table

below.

P The pipe thickness of the refrigerant piping should comply with relevant local and national

regulations. The minimal pipe thickness for R410A piping must be in accordance with the table

below.

Ο = Annealed

1/2H = Half hard

L3L1

L4L1

L7L1

Pair Twin Triple Double twin

Pipe φ Temper grade of piping material Minimal thickness t(mm)

6.4 / 9.5 / 12.7 Ο 0.80

15.9 Ο 1

19.1 1/2H 1

ESIE05-03.book Page 30 Wednesday, April 6, 2005 4:09 PM