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40
IM 738-2
Mechanical Installation:
RFS/RCS Permanent Split Systems
3
Evacuate the system again to 29" (740 mm) of vacuum.
Repeat his 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 18 on page 42 shows the relationship between pressure,
microns, atmospheres, and the boiling point of water.
* Condenser pumpdown capacity is the total charge for both circuits and is based on volume between condenser
entrance and liquid line solenoid at 90°F, 90% full
* 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 RFSO6OCLY.
** Condenser pumpdown capacity is the total charge for both circuits and is based on volume between condenser entrance and liquid line solenoid at 90º F,
90% full.
CAUTION
To prevent liquid return and damage to the compressor on
systems with optional hot gas bypass, locate the bypass
solenoid valve on the RCS, not on the RFS unit.
CAUTION
Before replacing refrigerant sensors or protective devices, see
“Refrigerant Charge” on page 43 for an important warning to
prevent an abrupt loss of the entire charge.
CAUTION
To service liquid line components, the manual shutoff valve is
closed and refrigerant is pumped into the condenser. The
pounds of refrigerant in the system may exceed the capacity of
the condenser, depending on the amount of refrigerant in the
liquid lines between the RFS and RCS units. Suitable means of
containing the refrigerant is required.
Table 13: Approximate R22 refrigerant charge per circuit, 015 to 018, 020C to 040C
Unit size
Base charge
lbs per circuit (less DX coil)
EVAP.coil
(lbs/CKT/coil row)
Additional charge for heat
section additional length
Condenser pumpdown
capacity*
(lbs)
Circuit #1
Circuit #2
Circuit #1
Circuit #2
015 to 018
11
18
0.8/1.5
.5
1
47
020C
11
18
0.8/1.5
1
1
47
025C
23
22
1.7
1
1
72
030C
23
21
1.7
1
1
72
036C
32
32
1.7
1
1
106
040C
33
32
1.7
1
1
106
Table 14: Approximate R22 refrigerant charge per circuit, 045C to 135C
Unit size
Base charge
lbs per circuit (less DX coil)
DX coil charge
lbs per circuit per coil row
Condenser pumpdown
capacity**
(lbs)
RPS
RDT
DX=S*
DX=L*
Circuit #1
Circuit #2
Circuit #1
Circuit #2
045C
34
33
34
28
2.5
—
108
050C
34
33
35
34
2.5
3.0
108
060C
35
34
35
34
2.5
3.0
108
070C
39
39
40
40
2.5
3.0
134
075C
39
39
40
40
2.5
3.0
134
080C
40
41
37
38
4.1
4.7
140
090C
46
47
44
47
4.1
4.7
160
105C
50
51
45
48
4.9
6.5
208
115C
59
60
60
63
4.9
6.5
208
125C
—
60
—
65
—
6.5
208
135C
—
60
—
65
—
6.5
208
Summary of Contents for RDT-135c
Page 131: ...IM 738 2 129...