26
3. Check the voltage at the transformer secondary. See section A15, page 57, for transformer testing instruc-
tions. If the voltage is bad, replace the transformer. If the voltage is good, proceed to step 4.
4. Check the circuit board transformer connections. If the connections are loose or oxidized, repair the connec-
tions and retest the system. If the problem persists, replace the circuit board.
.4 Testing Flow Switch
1. Verify the flow switch directional arrow is pointing in the direction of flow awary from heater and towards
the heater return fitting outlet. If the flow switch orientation is incorrect, loosen or tighten the switch no
more than 1/2 turn, being careful not to bottom out the switch in the fitting. The switch’s flow arrow must
be parallel to the tee fitting as shown (fig. A). Test the system operation. If the condition persists, proceed to
step 2.
2. Remove the switch from the fitting making note of the number of turns (revolutions) it takes to do so. Visu-
ally inspect the switch for debris interference or damage. If debris is present, remove the debris, then reinstall
the switch with the same number of turns as originally installed. Test the system. If the switch is damaged,
replace the switch and retest the system. If the condition persists, proceed to step 3.
3. Test the switch operation with an ohmmeter (set to 1000-2000k range) for continuity across the switch ter-
minals. Measure resistance across the switch terminals for infinite resistance with the magnet arm
not
touch-
ing the switch body (fig. B), and for continuity (Ø ohms) with the magnet arm touching the switch body (fig.
B). If the flow switch tests OK, check the wiring harness. If the wiring harness tests OK, replace the circuit
board.
fig. A
fig. B
Incorrect
Orientation
Correct
Orientation
FLOW
Arrows
aligned
FLOW
Arrows
not
aligned
Open
Continuity 0
Ω
(Pump ON)
Closed
Ω
Infinite
Ω
(Pump OFF)
Ω
Summary of Contents for Premium J-315
Page 45: ...45 Appendix...
Page 62: ...62 Notes...
