Rheem ARL-JEZ 16 Seer Series, Installation Instructions Manual, Page: 34 / 40

34
SYSTEM CHARGE TROUBLESHOOTING
SUPERHEAT CALCULATION
1. Measure the suction pressure at the suction line service valve.
2. Convert the suction pressure to saturated temperature. See Table 9.
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 suction line temperature is
the superheat. Superheat normal range 9° to 16°.
SUBCOOLING CALCULATION
1. Measure the liquid pressure at the liquid line service valve.
2. Convert the liquid line pressure to saturated temperature. See Table 9.
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 5° to 14°.
LOW VOLTAGE SOLENOID TROUBLESHOOTING
Recommended troubleshooting process
1. Begin diagnosis at the ICC:
Check for flashing codes at the ICC.
2. Check compressor amperage:
Operate the system and measure compressor amperage. Cycle the solenoid on
and off at ten plus second intervals by applying and removing the molded plug
(make certain the ICC is in 2nd stage; large C on the 7-segment LED). Wait five
seconds after power is applied via the molded plug before taking a reading. The
compressor amperage should go up or down at least 25 percent (a saturated
condensing temperature below 80°F may not produce as wide a change in
amperage).
3. Check the voltage supplied to the solenoid:
Remove the solenoid plug from the compressor. With the unit running and the
thermostat calling for Y2 (24VAC at the yellow/blue wire; large C on the 7-seg-
ment LED), test the voltage output at the plug with a DC voltmeter. The reading
should be 4 to 18 volts. If not, unplug the harness from the ICC harness and
check voltage at the pins of the ICC harness. The ICC will not power the sole-
noid if the compressor is not running or fault code 1 or 9 is active.
4. Check solenoid resistance:
Measure the solenoid resistance at the pins on the compressor. The resistance
should be 32 to 60 ohms depending on compressor temperature. If the coil resis-
tance is infinity, much lower than 32 ohms, or is grounded the compressor must
be replaced.
TABLE 10
AIR CONDITIONING SYSTEM TROUBLESHOOTING TIPS
AIR CONDITIONING SYSTEM
TROUBLESHOOTING TIPS
TABLE 9
TEMPERATURE PRESSURE CHART
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
TXV Sensing Bulb Charge Lost Low Low High High Low
Poorly Insulated Sensing Bulb High High Low Low High
SYSTEM PROBLEM
INDICATORS