7
4. Determine the systems superheat as follows:
a. Read the system’s suction pressure, then using Table
III determine the system’s saturated suction tempera
ture.
b. Read the suction line temperature.
c. The system’s superheat = the suction line tempera
ture - the saturated liquid temperature.
SUCTION
PRESSURE KPa
SATURATED SUCTION
TEMPERATURE °C
345 -3.3
365 -2.2
380 -1.1
400 0
420 1.1
435 2.2
455 3.3
475 4.4
495 5.6
515 6.7
540 7.8
560 8.9
TABLE III - Saturated Suction Pressure (R-22)
5. Refer to Table IV for the proper system superheat. Adjust
the charge as necessary by adding charge to lower the
superheat or bleeding the charge to raise the superheat.
NOTE - When installing systems were the indoor outdoor
sections are separated by more than 7.6 meters, note the
maximum elevation separation limitations per the diagram in
the LOCATION section of these instructions.
Allowance (R-22) gram/meter 20.5
LINE
O. D. (mm)
LIQUID
LINE
SUCTION
LINE
6.4 20.5
9.5 54.0
12.7 106.0
15.9 173.0 3.8
19.1 5.6
22.2 7.4
28.6 14.0
34.9 20.5
TABLE II - Line Charge
SUPERHEAT METHOD :
1. With both base valves fully open, connect a set of ser-
vice gauges to the base valves’ service port, being care-
ful to purge the lines.
2. Allow the system to operate at least 10 minutes or until
the pressures stabilize.
3. Temporarily install a thermometer on the suction (large)
line near the condensing unit’s base valve. Make sure
that there is good contact between the thermometer and
the refrigerant line and wrap the thermometer and line
with insulating tape to assure accurate readings.
TABLE IV - System Superheat
Drybulb W etbulb Drybulb We tbulb Drybulb We tbulb Drybulb Wetbulb Drybulb Wetbulb
18º 12º 21º 1 4º 24º 17º 27º 19 º 29º 22º
46
38
35
32
29
27
24
21
18
16
16
4 8 12 16 17
3 6 11 14
12
3 3 8 13 14
33611
9
3 3 3 10 11
---
337
5
--- ---
366
--- ---
3 3
*
---
--- --- ---
3
NOTE: * Charge 3° super heat, all other could be ± 1.1°C
SYSTEM SUPERHEAT
Return Air Tempe rature ( 50%RH )
3
Am b i en t C o nd e n ser
Inlet Temperature
( °C Drybulb )
3
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(20 pages)
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