Troubleshooting
9.Check the continuity of the hose components.
a.Use an ohmmeter to check the electrical resistance at the heating element pins be- tween pins A1 and A2 of the machine end connector (A) that attaches to the heated hose control. See Fig.1. The resistance of the heating element for the various lengths of coupled hose assemblies is given in the follow- ing coupled hose chart.
| Pins A1 & A2 |
|
Length/ft | Resistance Values (ohms) at 230 VAC | |
|
|
|
6 | 176 | +/– 18 |
|
|
|
10 | 106 | +/– 11 |
|
|
|
15 | 71 | +/– 7 |
|
|
|
20 | 53 | +/– 5 |
|
|
|
25 | 42 | +/– 4 |
|
|
|
Any resistance reading outside the range may indicate a faulty hose
The resistance values of the RTD will vary with tem- perature. An approximation of hose temperature must be made to verify the resistance reading of the RTD across pin A4 and A5 is correct.
b.Between pin A4 and A5 of the large machine end connector, the RTD resistance must be within the range of the following chart.
Approximate RTD resistance values at various temper- atures.
|
| Pins A4 & A5 | |
Temperature | Approximate Resistance Values | ||
|
| (ohms) | |
C | F | ||
| |||
|
|
| |
16 | 60 | 106 | |
|
|
| |
27 | 80 | 110 | |
|
|
| |
38 | 100 | 115 | |
|
|
| |
49 | 120 | 119 | |
|
|
| |
60 | 140 | 123 | |
|
|
| |
71 | 160 | 128 | |
|
|
| |
82 | 180 | 132 | |
|
|
| |
93 | 200 | 136 | |
|
|
| |
104 | 220 | 140 | |
|
|
| |
116 | 240 | 144 | |
|
|
| |
127 | 260 | 149 | |
|
|
| |
138 | 280 | 153 | |
|
|
| |
149 | 300 | 160 | |
|
|
| |
160 | 320 | 161 | |
|
|
| |
171 | 340 | 165 | |
|
|
| |
182 | 360 | 170 | |
|
|
| |
193 | 380 | 174 | |
|
|
| |
204 | 400 | 177 | |
|
|
| |
10.Check all hose connections to be sure they are securely tightened.
11.Ground the system.
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