Rheem RTG74 User Manual

SVC 810 Tankless Troubleshooting Manual
19
Q R1 – W2 DC8 – 30V
(measured 2 minutes
after combustion
startup)
P 1 – 2 DC8 – 30V
(measured 2 minutes
after combustion
startup)
Is the thermo-electromotive force OK?
O W1 – W2 Less than 1V DC;
Less than 1Ω
Is the air intake switch working?
Thermistor Resistance Chart
Temp
°F
Resistance
KΩ
Temp
°F
Resistance
KΩ
Temp
°F
Resistance
KΩ
Temp
°F
Resistance
KΩ
32 23.73 77 8.494 122 3.485 167 1.598
33.8 22.706 78.8 8.177 123.8 3.371 168.8 1.552
35.6 21.733 80.6 7.873 125.6 3.262 170.6 1.508
37.4 20.806 82.4 7.583 127.4 3.156 172.4 1.465
39.2 19.925 84.2 7.304 129.2 3.055 174.2 1.424
41 19.085 86 7.037 131 2.957 176 1.384
42.8 18.286 87.8 6.781 132.8 2.863 177.8 1.345
44.6 17.525 89.6 6.536 134.6 2.773 179.6 1.307
46.4 16.799 91.4 6.302 136.4 2.686 181.4 1.271
48.2 16.108 93.2 6.076 138.2 2.602 183.2 1.236
50 15.449 95 5.86 140 2.52 185 1.202
51.8 14.82 96.8 5.653 141.8 2.442 186.8 1.169
53.6 14.221 98.6 5.454 143.6 2.367 188.6 1.137
55.4 13.469 100.4 5.264 145.4 2.295 190.4 1.106
57.2 13.104 102.2 5.081 147.2 2.225 192.2 1.077
59 12.583 104 4.905 149 2.157 194 1.048
60.8 12.086 105.8 4.736 150.8 2.092 195.8 1.02
62.6 11.611 107.6 4.574 152.6 2.029 197.6 0.993
64.4 11.157 109.4 4.418 154.4 1.968 199.4 0.966
66.2 10.723 111.2 4.269 156.2 1.91 201.2 0.941
68 10.309 113 4.125 158 1.853 203 0.916
69.8 9.913 114.8 3.987 159.8 1.799 204.8 0.893
71.6 9.534 116.6 3.854 161.6 1.746 206.6 0.869
73.4 9.172 118.4 3.726 163.4 1.695 208.4 0.847
75.2 8.826 120.2 3.603 165.2 1.646 210.2 0.825

Rheem RTG74 Specifications

General

Brand	Rheem
Model	RTG74
Category	Water Heater
Language	English