PH-20/PHX-20 Manual
38
Hose Heating (cont’d)
Because the gun whip takes the most abuse it is most likely that the whip has
failed. Disconnect the crossover wires on the machine end of the whip hose
and connect the two wires together coming off the 50’ section, turn on the hose heat
and see if the hose heat circuit is operating, if so replace the whip. To take a
continuity reading through the heated hose one of the leads from the transformer to
the “A” or “R” heated hose must be disconnected.
If no voltage is coming out of the transformer to the heated hose move on to
the next step.
6. Open the console top and locate the solid state relay for the hose circuit, looking
over the console top (front of machine) it is the relay to the right. With the hose
turned on and there is a LED light lit on the relay take a volt meter set on DC and
measure across position A1 and A2 your Reading should be 24 volts, then take an
AC volts measurement across position L1 and L2 (heavy wires). With the relay
functioning properly you should have a 1 volt Reading, if the Reading is 18 to 90
volts AC the relay has malfunctioned and needs to be replaced. If the AC Reading
across L1 and L2 is .025 volts check the over temperature switches in the heaters.
A defective over temperature switch will open a contactor disabling both Heaters
and the Hose.
If there is no light on the solid state relay move to the next step.
7. Using a DC volt meter measure across position 5 and 6 on the back of the hose
controller this is the output of the controller and sends power to the solid state relay,
your reading will be 4-6 volts DC if there is no voltage check to make sure that the
set temperature of the controller is above ambient temperature. Before replacing the
controller read across position 1 and 2 to make sure that the controller is powered
up, your reading will be 208 to 230 volts AC.
If there is no DC voltage to the relay move to the next step.
PROBLEM
Hose does not heat and the display on the controller shows an error message (EEEE).
SOLUTIONS
1. Check position 6 and 7 on the heater controller for loose wires.
If the wires are tight move to the next step.
2. Remove the transformer cover and check that the thermocouple wires are secure to
the harness going up to the controller. If there are no loose connections disconnect
the wire from the TSU and connect it directly to the thermocouple harness coming
out of the hose transformer.
If the controller still shows the error code replace the hose thermocouple.
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