Lennox ASC Series Installation, Operating And Maintenance Manual page 22

2. INSTALLATION
2.6- REFRIGERANT CONNECTIONS
TABLE 3.1 : REFRIGERANT CHARGE
020S 025S 030S
C1 5155 5315 5700
C2 ------ ------ ------
020S 025S 030S
C1 5725 5900 6330
C2 ------ ------ ------
Note :
MODELS 100D and 120D USE DIFFERENT SIZES OF PIPE CONNECTIONS : LARGE SIZE FOR CIRCUIT 1 AND
SMALL SIZE FOR CIRCUIT 2.
REFRIGERANT CHARGE FOR THE SET:
EXAMPLE:
To install a ASH 030S + Air treatment unit, with 22 m refrigerant line length between the condensing and Air treatment unit,
the refrigerant charge must be calculated as follows:
1 TABLE 1 (p. 20) shows that for 22m of line length between the condensing and Air treatment unit, the line sizes are: liquid 5/8"
and gas 1 1/8".
2 TABLE 2 (p. 20) shows, for line sizes of 5/8"-1 1/8", the charge per meter of line is: 177 g/m x 22m = 3894 g.
3 TABLE 3.1 shows charge of refrigerant for a set with 0m line length is: 6330 g.
4 To determine the charge of the set:
Add the charge in the refrigerant lines + the charge in the Air treatment unit and condensing refrigerant units.
Note: If the condensing unit includes the factory pre-charged kit, only the weight of refrigerant per meter of line in TABLE 2 is taken
into account.
100D to 140D units with 3 compressors are working using three capacity steps and 200D-230D with 4 capacity steps.
See the picture below for the installation in the case of units with tandem compressor circuit. An additional gas line has to be used
to assure the correct operation of the system.
Condensing unit with capacity reduction
Tandem compressor circuit
4
Min 0.25% gradient
2
H2
3
• 21 •
Charge of refrigerant (gr) R-410A for 0 meters of line (Cooling only) ASC + Air T. Unit
035S 040S 045D
7950 9745 6250
------ ------ 6250
Charge of refrigerant (gr) R-410A for 0 meters of line (Heat pump) ASH + Air T. Unit
035S 040S 045D
8835 10830 6940
------ ------ 6940
Total charge for the set: 3894 + 6330 = 10224 g
H1
H2
H4
2
3
H1
4
Models with tandem compressor
100D
Circuit 1
055D 070D 085D
5775 7870 9800
5775 7870 9800
055D 070D 085D
6420 8740 10900
6420 8740 10900
15 m max
5 m max
0,15 m min
Coupled trap
Lower trap with double tubes
Higher trap with double tubes
120D
Circuit 1 Circuit 1
Installation, Operation and Maintenance manual • ASC/ASH-MIL152E-1217-01/2019
100D 120D 140D
12130 15585 15500
10450 10045 15400
100D 120D 140D
13480 17315 17230
11600 11160 17100
2
H4
140D 200D
Circuits 1 & 2
200D 230D
23100 24250
23100 24250
200D 230D
25660 26950
25660 26950
3
4
H4
230D
Circuits 1 & 2