York EVJC 12, Руководство по установке

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82
by johnson controls
8
GB
- R-410A refrigerant is not flammable at
atmospheric pressure. Nevertheless, as it
contains 50% HFC-32, it should never be
pressurised with air or any gas other than
nitrogen (the same as R-22).
POE oil
- POE oil is highly hygroscopic. Its water
absorbing capacity is 15 times greater
than mineral oil.
- POE oil containers should be metallic
and should be kept open the least time
possible. They should be hermetically
sealed after use.
- Never open a circuit or compressor charged
with POE oil while under vacuum. Should
either one be under atmospheric pressure,
it should not remain open for more than
15 minutes. Should this not be possible, a
flow of dry nitrogen should be established.
- POE oil cannot be mixed with mineral oil.
Amounts of over 5% of mineral oil mixed
with POE will cause transitory obstructions
within the expansion systems..
- It is recommendable to use filter-dryers on
systems using POE oil.
- Should the POE oil become contaminated
with water, a vacuum pump is no longer
sufficient. Excessive presence of humidity
causes sludge and acids that damage the
compressor. Therefore, any contaminated
oil should be changed or recovered by
means of filters.
- Due to its high hygroscopic nature, POE
oil can cause burns on the skin. The use of
gloves during handling is recommended.
- The POE oils that are adequate for R-410A
systems are as follows:
MOBIL EAL ARCTIC 22 CC (ICI)
EMKARATE RL32CF (ICI)
Specific tools
For installing equipment charged with
R-410A refrigerant and POE oil, the following
tools are required:
- Pressure gauges . Specific for R-410A.
High pressure (red) with a range of -1 to
53 bar. Low pressure (blue) with a range
of -1 to 38 bar. With ½” threaded UNF-20
connections.
- Hoses . Of HNBR rubber and with nylon
internal lining. Operating pressure 5.1
Mpa, bursting pressure 27.4 Mpa. ½”
UNF-20 thread.
- Vacuum pump . High vacuum (two stages)
and with adapter to avoid part of the mineral
oil in the pump from flowing towards the
circuit charged with POE oil. With adapter
for ½” UNF-20 thread.
- Electronic scale . Needed because it is
impossible to charge R-410A by using a
charge cylinder due to the bubbles caused
by the high pressure and speed of gas
evaporation.
-
Refrigerant tank . Adequate for a pressure
of 47 bar and for containing R-410A only
(painted pink). With adapter for ½” UNF-
20 thread.
- Leak detector
. Specific for HFC. Sensitivity
of approximately 23 gr. year.
- Recovery equipment . Specific unit for
recovery of R-410A.
Minimum thickness of tubing
Due to the greater operating pressures
of R-410A refrigerant, the interconnection
of the split units requires seamless DHP
copper tubing with thicker walls.
Tubing diameter
mm (inches
Minimum thickness
mm
6,35 (1/4") 0,76
9,52 (3/8") 0,812
12,70 (1/2") 0,812
Limits of use
Voltage limits Air intake temperature to outdoor coil DB Air intake temperature to indoor coil
Nom. 230 V
Operating cycle Operating cycle
Minimum °C Maximum °C Minimum °C Maximum °C
Minimum Maximum Cool Heat Cool Heat Cool WB Heat DB Cool WB Heat DB
198 254 19 -15 50 24 15 10(1) 23 (1) 32
Notes: WB = Wet bulb. DB = Dry bulb.
(1) This equipment can operate, for a short interval of time, at a temperature beyond limits until the occupied space is conditioned.