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.

8 309160

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Graco 309160L important safety instructions Troubleshooting, Check the continuity of the hose components

309160L specifications

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