Daikin RXYQ22PY1 [248/487] Field refrigerant piping

Daikin RXYQ22PY1 [248/487] Field refrigerant piping
REFNET Pipe System ED34-645B
640 Installation of Outdoor Units
3.3 Field Refrigerant Piping
1. The following materials should be used for all refrigerant piping.
Materials: Deoxidized phosphorous seamless copper pipe (for external diameters of 25.4mm or more, C1220T-0
for the rest) or equivalent
2. The tips for insulation
Gas piping must be insulated.
Be sure to insulate the liquid-side and gas-side piping for the inter-unit piping and the refrigerant branch kits and
always use 18-type or better insulation for the oil pressure equalizer.
Materials: Glass fiber or heat resistant polyethylene foam.
Thickness: 10mm or more
Heat resistance: Gas pipe : 120°C or more / Liquid pipe : 70°C or more
If you think the humidity around the cooling piping might exceed 30°C and RH80%, reinforce the insulation on the
cooling piping (at least 20mm thick). Condensation might form on the surface of the insulation.
CAUTION
Be sure to size up the main gas line in the connecting piping of the suction gas piping if the equivalent length of the
piping between the indoor and outdoor units exceeds 90m. In order to minimize the reduction of capacity caused by
the pressure drop, the refrigerant pipe size may be sized up.
3. Equivalent Piping Length of Joints and Header (Reference)
Insulation of both liquid and gas pipe
(Unit: mm)
Pipe Size
φ
6.4
φ
9.5
φ
12.7
φ
15.9
φ
19.1
φ
25.4
φ
31.8
φ
34.9
φ
38.1
φ
41.3
L Joints
0.16 0.18 0.20 0.25 0.35 0.45 0.55 0.60 0.65 0.75
REFNET Joint
0.5
REFNET Header
1.0

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