Additional Charge; Special Precautions When Dealing With R410A Unit - Daikin RN25CXV1 Installation Manual

The refrigerant is pre-charge in the outdoor unit. If the piping length is less than 7.5m, then additional charge after vacuuming
is not necessary. When the piping length is more than 7.5m, use the table below.
Additional refrigerant charge [g] per additional 1m length as tabulated (for R410A models)
Cooling only
Model
Additional charge [g/m]
Model
Additional charge [g/m]
Heat Pump
Model
Additional charge [g/m]
Model
Additional charge [g/m]
Example:
FDMRN25C & RN25C with 13m piping length, additional piping length is 5.5m. Thus,
Additional charge = 5.5[m] x 13[g/m]
R410A is a new HFC refrigerant which does not damage the
ozone layer. The working pressure of this new refrigerant is
1.6 times higher than conventional refrigerant (R22), thus
proper installation / servicing is essential.
• Never use refrigerant other than R410A in an air conditioner
which is designed to operate with R410A.
• POE or PVE oil is used as lubricant for R410A compressor,
which is different from the mineral oil used for R22
compressor. During installation or servicing, extra precaution
must be taken not to expose the R410A system too long
to moist air. Residual POE or PVE oil in the piping and
components can absorb moisture from the air.
• To prevent mischarging, the diameter of the service port
on the fl are valve is different from that of R22.
1 IM-5CCC-0912(0)-DAIKIN_EN.indd19 19 1 IM-5CCC-0912(0)-DAIKIN_EN.indd19 19

ADDITIONAL CHARGE

Indoor (FDMRN) 25C
Outdoor (RN/RR) 25C
Indoor (FDMRN)
Outdoor (RR) 90D (1Ph)
23
Indoor (FDMQN) 25C
Outdoor (RYN/RQ) 25C
Indoor (FDMQN)
Outdoor (RQ) 90D (1Ph)
33
= 71.5[g]

SPECIAL PRECAUTIONS WHEN DEALING WITH R410A UNIT

35C
35C
13 13
100C
90D (3Ph) 100D (1Ph) 100D (3Ph)
23 26
35C
35C
20 20
100C
90D (3Ph) 100D (1Ph) 100D (3Ph)
33 37
• Use tools and materials exclusively for refrigerant R410A.
Tools exclusively for R410A are manifold valve, charging
hose, pressure gauge, gas leak detector, fl are tools, torque
wrench, vacuum pump and refrigerant cylinder.
• As an R410A air conditioner incurs higher pressure
than R22 units, it is essential to choose the copper pipes
correctly. Never use copper pipes thinner than 0.8mm even
though they are available in the market.
• If the refrigerant gas leakage occurs during installation /
servicing, be sure to ventilate fully. If the refrigerant gas
comes into contact with fi re, a poisonous gas may occur.
• When installing or removing an air conditioner, do not
allow air or moisture to remain in the refrigerant cycle.
1-19
50C 60C
50C 60C
15 15
125C
125D
26 23
50C 60C
50C 60C
20 20
125C
125D
37 33
71C
71C
33
140C
140D
32
71C
71C
46
140C
140D
46
10/9/12 4:11:11 PM 10/9/12 4:11:11 PM