ABOVE
f ER I A ....RFC
If refrigerant added or
removed, retest to confirm
that unit is properly
charged
If value is greater than
shown, add refrigerant; if
less than shown, remove
refrigerant.
SH ° (Superheat) Values (+/-5°F)
Wet Bulb air enterinc indoor coil
°F* 50 52 54 56 '58 60 62 64 66 68 70 72 74 76
40 15 18 20 23 26 29 32 34 38 41 43 46 48 51
45 13 16 18 21 24 27 30 33 36 39 41 44 46 49
50 11 14 16 19 22 25 28 31 34 37 39 42 44 47
55 9 12 14 17 20 23 27 30 33 36 38 40 42 44
60 7 10 12 15 18 21 24 27 30 33 35 38 40 43
65 6 10 13 16 19 21 24 27 30 33 36 38 41
70 7 10 13 16 19 21 24 27 30 33 36 39
75 6 9 12 15 18 21 24 28 31 34 37
80 5 8 12 15 18 21 25 28 31 35
85 8 11 15 19 22 26 30 33
90 5 9 13 16 20 24 27 31
95 6 10 14 18 22 25 29
100 8 12 16 21 24 28
105 5 9 13 17 22 26
110 6 11 15 20 25
115 8 14 18 24
* Dry-bulb temperature (°F) of entering outdoor ambient air.
1. Confirm proper airflow across coil using figure27.
2. Compare unit pressures with Table 6, Normal
Operating Pressures.
3. Use SUPERHEAT to correctly charge unit or to
verify the charge is correct,
4. Set thermostat to call for heat (must have a cooling
load between 70-80°F (21-26°C)
5. Connect gauge set,
6. When heat demand is satisfied, set thermostat to
call for cooling.
7. Allow temperatures and pressures to stabilize.
8. Measure the suction line pressure and use the use
value to determine saturation temperature:
SAT o=
9. Record suction line temperature:
VAP o=
10. Subtract to determine superheat (SH°):
VAP o. SAT o = SH o
11. Record the wet bulb temperature (air entering
indoor coil):
WB =
12. Record outdoor ambient temperature,
13. Compare results with table to the left,
NOTE - Do not attempt to charge system where a
dash appears, system could be ovemharged.
Superheat is taken at suction line service port.
Suction line superheat must never be less than 5°t:
at the suction line service port.
Figure 32. HCFC-22 Superheat RFC Charge
Page 17
13ACD SERIES
To Next Page
Loading...
Need help?
General
