Daikin RDT-135c Installation And Maintenance Manual page 42

Mechanical Installation: RFS/RCS Permanent Split Systems
Evacuate the system again to 29" (740 mm) of vacuum.
3
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.
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.
Table 13: Approximate R22 refrigerant charge per circuit, 015 to 018, 020C to 040C
lbs per circuit (less DX coil)
Unit size
Circuit #1
015 to 018 11
020C 11
025C 23
030C 23
036C 32
040C 33
* 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
Table 14: Approximate R22 refrigerant charge per circuit, 045C to 135C
Unit size
RPS
Circuit #1
045C 34
050C 34
060C 35
070C 39
075C 39
080C 40
090C 46
105C 50
115C 59
125C —
135C —
* 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.
40
CAUTION
Base charge
(lbs/CKT/coil row)
Circuit #2
18
18
22
21
32
32
Base charge
lbs per circuit (less DX coil)
Circuit #2 Circuit #1
33 34
33 35
34 35
39 40
39 40
41 37
47 44
51 45
60 60
60 —
60 —
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.
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.
Additional charge for heat
EVAP.coil
section additional length
Circuit #1
0.8/1.5 .5
0.8/1.5 1
1.7 1
1.7 1
1.7 1
1.7 1
DX coil charge
lbs per circuit per coil row
RDT
DX=S*
Circuit #2
28 2.5
34 2.5
34 2.5
40 2.5
40 2.5
38 4.1
47 4.1
48 4.9
63 4.9
65 —
65 —
CAUTION
CAUTION
Condenser pumpdown
capacity*
(lbs)
Circuit #2
1 47
1 47
1 72
1 72
1 106
1 106
Condenser pumpdown
capacity**
(lbs)
DX=L*
— 108
3.0 108
3.0 108
3.0 134
3.0 134
4.7 140
4.7 160
6.5 208
6.5 208
6.5 208
6.5 208
IM 738-2