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036-21544-001 Rev. B (1103)
Mitsubishi Electronics 2003 25
3. Measure and record the suction pressure at the suction
service valve port.
4. Using Table 1, note the superheat value corresponding
to the intersection of the indoor wet bulb and the outdoor
dry bulb.
5. With the superheat value obtained in step 4 and the suc-
tion pressure value from step 3, find the intersection of
the values in Table 2. This is the required suction tube
temperature at the suction service valve.
6. To bring the tube temperature in line with the required
value from Table 2, add refrigerant to the service port to
cause the tube temperature to fall and reclaim refrigerant
to cause the temperature to rise.
Table 2: TEMPERATURE AND PRESSURE
SUCTION
PRESSURE
PSIG
(Service Port)
SUCTION SERVICE VALVE SUPERHEAT
0
1
246810121416182022242628303234
61.5 353739414345474951535557596163656769
64.2 373941434547495153555759616365676971
67.1 394143454749515355575961636567697173
70.0 414345474951535557596163656769717375
73.0 434547495153555759616363676971737577
76.0 454749515355575961636567697173757779
79.2 474951535557596163656769717375777981
82.4 495153555759616365676971737577798183
1. Saturation Temperature
OPERATING PRESSURES / SUPERHEAT7