Rheem RAMP-JEZ Installation Instructions - Page 22

Superheat Calculation, Subcooling Calculation

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TTAABBLLEE192 TTEEMMPPEERRAATTUURREEPPRREESSSSUURE CHART TEMP (Deg. F) R-410A PSIG -150 - -140 - -130 - -120 - -110 - -100 - -90 - -80 - -70 - -60 0.4 -50 5.1 -40 10.9 -35 14.2 -30 17.9 -25 22.0 -20 26.4 -15 31.3 -10 36.5 -5 42.2 0 48.4 5 55.1 10 62.4 15 70.2 20 78.5 25 87.5 30 97.2 35 107.5 40 118.5 45 130.2 50 142.7 55 156.0 60 170.1 65 185.1 70 201.0 75 217.8 80 235.6 85 254.5 90 274.3 95 295.3 100 317.4 105 340.6 110 365.1 115 390.9 120 418.0 125 446.5 130 476.5 135 508.0 140 541.2 145 576.0 150 612.8 22 SUPERHEAT CALCULATION 1. Measure the suction pressure at the suction line service valve. 2. Convert the suction pressure to saturated temperature. See TTable 91.2. 3. Measure the temperature of the suction line at the suction line service valve. 4. Compare the temperature of the suction line to the saturated temperature. 5. The difference between saturated temperature and suctin line temperature is the superheat. Superheat normal range 12° to 15°. SUBCOOLING CALCULATION 1. Measure the liquid pressure at the liquid line service valve. 2. Convert the liquid line pressure to ssaattuurraatteedd tteemmppeerratuturere. .SSeeeeTTaabblele1130. . 3. Measure the liquid line temperature at the liquid line service valve. 4. Compare the liquid line temperature to the saturated temperature. 5. The difference between saturated temperature and liquid line temperature is the subcooling. Subcooling normal range 9° to 12°. TAABBLLEE 1130 AIR CONDITIONING SYSTEM TTRROOUUBBLLEESSHHOOOOTTIINNGGTTIIPPSS AIR CONDITIONING SYSTEM TROUBLESHOOTING TIPS SYSTEM PROBLEM INDICATORS DISCHARGE PRESSURE SUCTION PRESSURE SUPERHEAT SUBCOOLING COMPRESSOR AMPS Overcharge High High Low High High Undercharge Low Low High Low Low Liquid Restriction (Drier) Low Low High High Low Low Evaporator Airflow Low Low Low Low Low Dirty Condenser High High Low Low High Low Outside Ambient Temperature Low Low High High Low Inefficient Compressor Low High High High Low TEV Feeler Bulb Charge Lost Low Low High High Low Poorly Insulated Sensing Bulb High High Low Low High

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22
AIR CONDITIONING SYSTEM
TROUBLESHOOTING TIPS
SUPERHEAT CALCULATION
1.
Measure the suction pressure at the suction line service valve.
3.
Measure the temperature of the suction line at the suction line service valve.
4.
Compare the temperature of the suction line to the saturated temperature.
5.
The difference between saturated temperature and suctin line temperature is the
superheat. Superheat normal range 12° to 15°.
SUBCOOLING CALCULATION
1.
Measure the liquid pressure at the liquid line service valve.
3.
Measure the liquid line temperature at the liquid line service valve.
4.
Compare the liquid line temperature to the saturated temperature.
5. The difference between saturated temperature and liquid line temperature is the
subcooling. Subcooling normal range 9° to 12°.
TEMP
R-410A
(Deg. F)
PSIG
-150
—
-140
—
-130
—
-120
—
-110
—
-100
—
-90
—
-80
—
-70
—
-60
0.4
-50
5.1
-40
10.9
-35
14.2
-30
17.9
-25
22.0
-20
26.4
-15
31.3
-10
36.5
-5
42.2
0
48.4
5
55.1
10
62.4
15
70.2
20
78.5
25
87.5
30
97.2
35
107.5
40
118.5
45
130.2
50
142.7
55
156.0
60
170.1
65
185.1
70
201.0
75
217.8
80
235.6
85
254.5
90
274.3
95
295.3
100
317.4
105
340.6
110
365.1
115
390.9
120
418.0
125
446.5
130
476.5
135
508.0
140
541.2
145
576.0
150
612.8
DISCHARGE
SUCTION
SUPERHEAT
SUBCOOLING
COMPRESSOR
PRESSURE
PRESSURE
AMPS
Overcharge
High
High
Low
High
High
Undercharge
Low
Low
High
Low
Low
Liquid Restriction (Drier)
Low
Low
High
High
Low
Low Evaporator Airflow
Low
Low
Low
Low
Low
Dirty Condenser
High
High
Low
Low
High
Low Outside Ambient Temperature
Low
Low
High
High
Low
Inefficient Compressor
Low
High
High
High
Low
Low
Low
High
High
Low
Poorly Insulated Sensing Bulb
High
High
Low
Low
High
SYSTEM PROBLEM
INDICATORS
2.
2.
TEV Feeler Bulb Charge Lost
Convert the suction pressure to saturated temperature. See Table 12.
Convert the liquid line pressure to saturated temperture. See Table 13.
TABLE 12
TEMPERATURE PRESSURE CHART
TABLE 13
AIR CONDITIONING SYSTEM TROUBLESHOOTING TIPS