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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.
Length/ft
Pins A1 & A2
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.
Temperature
Pins A4 & A5
Approximate Resistance Values
(ohms)
C F
(ohms)
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.