Daikin RP200B7W1 Installation Manual Download

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EFRIGERANT

PIPE

SIZE

AND

ALLOWABLE

PIPE

LENGTH

All field piping must be installed by a licensed refrigeration
technician and must comply with relevant local and
national regulations.

1. Refrigerant pipe size

a) Pair system: see figure 2

b) Simultaneous operation system

•

Twin and triple operation system (twin: see figure 3, triple: see
figure 4)

The pipes between the outdoor unit and the branch (L1) should
have the same size as the outdoor connections. The pipes
between the branch and the indoor units (L2~L4) should have the
same size as the indoor connections. Branch: see marking ‘

■

’ on

figures 3~4.

•

Double twin operation system: see figure 5

The pipes between the outdoor unit and the branch (L1) should
have the same size as the outdoor connections. The pipes
between the branch and the indoor units (L4~L7) should have the
same size as the indoor connections. Branch: see marking ‘

■

’ on

figure 5.

For branch pipes L2 and L3: see table below for the branch pipe
sizes.

2. Allowable pipe length
See the table below concerning lengths and heights. Refer to
figures 2~5. Assume that the longest line in the figure corres-
ponds with the actual longest pipe, and the highest unit in the
figure corresponds with the actual highest unit.

The minimal piping length should be 7.5m. If installation is
performed with less field piping, the system will be overcharged
(abnormal HP, etc.). If the distance between indoor and outdoor
unit is less than 7.5 m, please make sure that the piping length
is

≥

7.5 m by additional bending of the pipes.

RECAUTIONS

REFRIGERANT

PIPING

When a heat pump outdoor unit is installed below the indoor unit,
the following can occur:

when the unit stops, oil will return to the discharge side of the
compressor. When starting the unit, this can cause liquid (oil)
hammer.

the oil circulation will decrease

To solve these phenomena, provide oil traps in the gas pipe every
15m if the level difference (H) is more than 15m. See figure 6.

A outdoor unit
B indoor unit
C gas pipe
D liquid pipe
E oil trap

Note:

if the outdoor unit is installed above the indoor unit, oil
traps are not necessary.

Connecting the refrigerant piping

For R407C units:

Use R407C only when adding refrigerant
Installation tools:
Make sure to use installation tools (gauge manifold
charge hose, etc.) that are exclusively used for R407C
installations to withstand the pressure and to prevent
foreign materials (e.g. mineral oils and moisture) from
mixing into the system. Vacuum pump (use a 2-stage
vacuum pump with a non-return valve):

Make sure the pump oil does not flow oppositely into the
system while the pump is not working.

Use a vacuum pump which can evacuate to -100.7kPa
(5Torr, -755mmHg).

Installation of refrigerant piping is possible as front connection,
side connection and bottom connection.

1. Flange
2. Flare nut
3. Gas side (attached pipe)
4. Liquid side
5. Brazing
6. Knock out hole

Refrigerant pipe size

Gas pipe

Liquid pipe

R(Y)(P)200

R(Y)(P)250

ø 12.7 x t0.90

ø 15.9 x t0.95

ø 28.6 x t1.15