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Daikin RXYQ5PY1 Service Manual Page 305

Daikin r-410a heat pump 50hz/60hz cooling only 50hz.
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Heat Pump 60Hz (RXYQ5~54P)
2.11 Additional Refrigerant Charge and Check Operation
The outdoor unit is charged with refrigerant when shipped from the factory, but depending on
the size and length of the piping when installed, it may require additional charging.
For charging the additional refrigerant, follow the procedure in this chapter.
And then carry out the check operation.
2.11.1 Before working
[About the refrigerant tank]
Check whether the tank has a siphon pipe before charging and place the tank so that the
refrigerant is charged in liquid form. (See the figure below.)
With siphon pipe
Other tanks
! Always use the proper refrigerant (R-410A). If charged with the refrigerant containing an
! R-410A is a mixed refrigerant, so charging it as a gas will cause the refrigerant composition
[Shutoff valve operation procedure]
When operating the shutoff valve, follow the procedure instructed below.
! Do not open the shutoff valve until "2-10 Checking of Device and Installation Conditions" are
! Be sure to use the correct tools.
! When using a service port, use the charge hose.
! After tightening the cap, make sure no refrigerant gas is leaking.
[Tightening torque]
The sizes of the shutoff valves on each model and the tightening torque for each size are listed
in the table below.
<Size of Shutoff Valve>
Liquid side
Gas side
improper material, it may cause an explosion or accident.
to change, which may prevent normal operation.
completed. If the shutoff valve is left open without turning on the power, it may cause
refrigerant to buildup in the compressor, leading insulation degradation.
The shutoff valve is not a back-seat type. If forced it to open, it might break the valve body.
5HP type
8HP type
The 12HP type corresponds to the 12.7-
diameter onsite piping using the included piping.
φ 15.9
φ 19.1
Stand the tank upright and charge.
(The siphon pipe goes all the way inside,
so the tank does not need be put
upside-down charge in liquid form.)
Stand the tank upside-down and charge.
10HP type 12HP type 14HP type 16HP type 18HP type
φ 9.5
The 10HP type corresponds to the
22.2-diameter onsite piping using the accessory pipe.
The 12 ~ 18HP type corresponds to the 28.6-diameter onsite
piping using the accessory pipe.
φ 12.7
The 18HP type corresponds to the
15.9-diameter onsite piping using
the accessory pipe.
φ 25.4
Installation Manual


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