Operation And Maintenance Total System Charge; Standard Length Line Set Extra Length Line Set - Dometic Blizzard Turbo Installation And Operation Manual

TROUBLESHOOTING
T S
OTAL YSTEM
S
TANDARD
A typical system consists of a CHEB, a line set, and a condenser. Each of these components come from the factory with a
specific amount of refrigerant so that they add up to the correct system charge. Therefore, the installer should not usually add or
subtract refrigerant.
But if for some reason the system needs to be recovered and recharged, it's important to know the correct total system charge,
and you can find this on the data plate. The data plate indicates two important numbers:
1. First, the data plate tells you how much refrigerant the individual component shipped with. For example, a typical
CHEB might indicate a 10 oz charge. That is because the CHEB itself shipped with 10 oz of refrigerant in it.
2. Second, the data plate tells you the nominal total system charge. It assumes you have a 6 ft line set, because that is
most common. For example, a typical system charge is 16.5 oz. That is, 10 oz in the CHEB + 3.5 in the condenser +
1.5 in the liquid line + 1.5 in the hot gas line = 16.5 oz. But if your line set is not 6 ft, then the optimum total system
charge will be different.
E L
XTRA ENGTH
For every extra foot of length (over 6 ft) in the liquid line, allow an additional 0.25 oz of refrigerant.
For example, suppose the data plate says 16.5 oz, but your liquid line is 8 ft long. That's 2 ft longer than the standard 6 ft:
2 ft x (0.25oz/ft) = 0.5 oz.
So for an 8 ft line set, the optimum total system charge is:
16.5 oz + 0.5 oz = 17 oz.
S L
HORTER
Going the other direction, if your line set is shorter than 6 ft, reduce 0.25 oz of refrigerant for every decreased foot of line set.
For example, if your liquid line is only 3 ft long, which is 3 ft shorter than the standard 6 ft:
-3 ft x (0.25oz/ft) = -0.75 oz
So for a 3 ft line set, the optimum total system charge is:
16.5 - 0.75 oz = 15.75 oz
Table 8: CHARGE ADJUSTMENTS FOR VARIOUS LENGTHS OF LINE SETS
26
C
HARGE
L L S
ENGTH INE ET
L S
INE ET
L S
ENGTH INE ET
TOTAL LENGTH OF
LIQUID LINE SET
(FT)
3.3
6
8
12
16
26
TOTAL SYSTEM
CHARGE ADJUSTMENT
(OZ)
-0.68 (decrease)
0.00 (no change)
0.50 (add)
1.50 (add)
2.50 (add)
5.00 (add)
Tur
Blizzard bo Split System Manual
L-3448 ENGLISH