Daikin Maverick II MPS062E Installation And Maintenance Manual page 95

Evacuation
Use a vacuum pump with a pumping capacity of approximately
3 cu.ft./min. and the ability to reduce the vacuum in the unit to
at least 1 mm (1000 microns).
1. Connect a mercury manometer or an electronic or other
type of micron gauge to the unit at a point remote from
the vacuum pump. For readings below 1 millimeter, use
an electronic or other micron gauge.
2. Use the triple evacuation method, which is particularly
helpful if the vacuum pump is unable to obtain the
desired 1 mm of vacuum. The system is first evacuated
to approximately 29" (740mm) of mercury. Then add
enough refrigerant vapor to the system to bring the
pressure up to 0 pounds (0 microns).
3. Evacuate the system again to 29" (740 mm) of vacuum.
Repeat this procedure three times. This method
is most effective by holding system pressure at 0
pounds (0 microns) for a minimum of 1 hour between
evacuations. The first pulldown removes about 90% of
the noncondensables; the second removes about 90%
of that remaining from the first pulldown. After the third
pulldown, only 1/10 of 1% of noncondensables remains.
Table 8 shows the relationship between pressure, microns,
atmospheres and the boiling point of water.
Table 7: Approximate R-410A Refrigerant Charge per Circuit
Unit size
Circuit #1
062E 15
070E, 075E 18
* DX coil configuration (S = Standard, L = Large) is identified by the 8th digit of the RPS/RDT or RFS model number, found on the unit nameplate.
For example, DX= L for unit model number RFSO6ODLY.
Table 8: Pressure-Vacuum Equivalents
Absolute pressure above zero
Microns
0
50
100
150
200
300
500
1,000
2000
4,000
6000
8,000
10,000
15,000
20,000
30,000
50,000
100,000
200,000
500,000
760,000
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Base charge lbs per circuit (less DX coil)
Blow through RPS
Circuit #2
14
17
Vacuum below 1 atmosphere
PSIA Mercury (in .)
0 29.921
0.001 29,920
0.002 29.920
0.003 29.920
0.004 29.910
0.006 29.910
0.009 29.900
0.019 29.880
0.039 29.840
0.078 29.760
0.117 29.690
0.156 29.600
0.193 29.530
0.290 29.330
0.387 29.130
0.580 28.740
0.967 27.950
1.930 25.980
3.870 22.050
9.670 10.240
14.697 0
RDT or draw through RPS
Circuit #1 Circuit #2
19 18
22 21
Approximate fraction of 1
Mercury (mm)
760.00
759.95
759.90
759.85
759.80
759.70
759.50
759.00
758.00
756.00
754.00
752.00
750.00
745.00
740.00
730.00
710.00
660.00
560.00
260.00
0
95
Maintenance
DX coil charge lbs per circuit per coil row
DX=S* DX=L*
4.1
4.1
Boiling point of H
atmosphere
each pressure (°F)
— —
1/15,200 –50
1/7,600 –40
1/5,100 –33
1/3,800 –28
1/2,500 –21
1/1,520 –12
1/760 1
1/380 15
1/189 29
1/127 39
1/95 46
1/76 52
1/50 63
1/38 72
1/25 84
1/15 101
2/15 125
1/4 152
2/3 192
1 Atmosphere 212
IM 991-2 • MAVERICK II ROOFTOP
4.5
4.5
O at
2