Daikin SIESTA SERIES, Installation Manual

Installation manual

7

How to use the stop valve

Use hexagonal wrenches 4 mm and 6 mm.



Opening the valve

1.

Place the hex wrench on the valve bar and turn counter-
clockwise.

2.

Stop when the valve bar no longer turns. It is now open.



Closing the valve

1.

Place the hex wrench on the valve bar and turn clockwise.

2.

Stop when the valve bar no longer turns. It is now closed.

Cautions for handling the valve cover



The valve cover is sealed where indicated by the arrow. 
Refer to the figure.
Take care not to damage it.



After operating the valve, be sure to tighten the valve cover
properly.



Check for refrigerant leakage after tightening the cap.

Cautions for handling service port



Always use a flexible charge hose with a push-rod and valve to
enable recovery of remaining refrigerant in the charge hose.



After the work, tighten the valve cover in place.
Tightening torque: 11.5~13.9 N•m

Precautions when connecting field piping and regarding 
insulation



Be careful not to let the indoor and outdoor branch piping come
into contact with the compressor terminal cover.
If the liquid-side piping insulation might come into contact with it,
adjust the height as shown in the figure below. Also, make sure
the field piping does not touch the bolts or outer panels of the
compressor.



When the outdoor unit is installed above the indoor unit the
following can occur:
The condensated water on the stop valve can move to the
indoor unit. To avoid this, please cover the stop valve with
sealing material.



If the temperature is higher than 30°C and the humidity is higher
than RH 80%, then the thickness of the sealing materials should
be at least 20 mm in order to avoid condensation on the surface
of the sealing.



Be sure to insulate the liquid and gas-side field piping and the
refrigerant branch kit.

(The highest temperature that the gas-side piping can reach is
around 120°C, so be sure to use insulating material which is
very resistant.)

Cautions for flare connection



Please refer to the table for the dimensions for processing flares
and for the tightening torques. (Too much tightening will end up
in splitting of the flare.)

If a torque wrench is not available, be aware that the tightening
torque may increase suddenly. Do not tighten nuts any further
than to the angle as listed.



When connecting the flare nut, coat the flare inner surface with
ether oil or ester oil and initially tighten 3 or 4 turns by hand
before tightening firmly.



After completing the installation, carry out a gas leak inspection
of the piping connections with nitrogen and such.

Closing direction

A

Liquid side

B

Gas side

Tightening torque

Liquid pipe

13.5~16.5 N•m

Gas pipe

22.5~27.5 N•m

A

B

Any exposed piping may cause condensation or burns
if touched.

Piping 

size

Flare nut 

tightening torque

A - dimensions for 

processing flares 

(mm)

Flare shape

Ø6.4

15~17 N•m

8.7~9.1

Ø9.5

33~39 N•m

12.8~13.2

Ø12.7

50~60 N•m

16.2~16.6

Ø15.9

63~75 N•m

19.3~19.7

Piping size

Further tightening angle

Recommended arm 

length of tool

Ø6.4

60°~90°

150 mm

Ø9.5

200 mm

Ø12.7

30°~60°

250 mm

Ø15.9

300 mm

2

1

3

5

5

A

4

4

6

1

Compressor

2

Terminal cover

3

Indoor and outdoor 
field piping

4

Corking, etc.

5

Insulation material

6

Bolts

A

Be careful with pipe, 
bolt and outer panel 
connections

R=0.4~0.8

45

° ±

2

90

°±

2

A