Daikin 3MXM40A2V1B9 Installer's Reference Manual page 40

7 | Piping installation
To open/close the stop valve
To handle the stem cap
Installer reference guide
40
▪ Keep both stop valves open during operation.
▪ Do NOT apply excessive force to the valve stem. Doing so may break the valve
body.
▪ ALWAYS make sure to secure the stop valve with a spanner, then loosen or
tighten the flare nut with a torque wrench. Do NOT place the spanner on the
stem cap, as this could cause a refrigerant leak.
a
b
a Spanner
b Torque wrench
▪ When it is expected that the operating pressure will be low (e.g. when cooling
will be performed while the outside air temperature is low), sufficiently seal the
flare nut in the stop valve on the gas line with silicon sealant to prevent freezing.
Silicon sealant, make sure there is no gap.
1 Remove the stop valve cover.
2 Insert a hexagon wrench (liquid side: 4 mm, gas side: 6 mm) into the valve
stem and turn the valve stem:
Counterclockwise to open
Clockwise to close
3 When the stop valve CANNOT be turned any further, stop turning.
4 Install the stop valve cover.
Result: The valve is now open/closed.
▪ The stem cap is sealed where indicated with the arrow. Do NOT damage it.
▪ After handling the stop valve, tighten the stem cap, and check for refrigerant
leaks.
Stem cap Width across flats (mm)
Liquid side
Gas side
Tightening torque (N∙m)
19
22
2MXM-A9, 3MXM-A9, 4MXM-A9, 5MXM-A9
18~20
21~28
R32 Split series
4P600463-7G – 2022.09