Inspecting The Mixer System - Daikin GYEQ20AN Service Manual

SiAUY361411EA
1.4

Inspecting the Mixer System

Fuel control valve
1. Using a tester, check if the output voltage requirements specified above are met.
2. If the voltage is significantly different than specified above, stop the system using the
3. If the harnesses and connectors are OK, then check each component.
Inspect the mixer by measuring the resistance between its terminals.
Between terminals #2 (red)
and #4 (white)
Between terminals #2 (red)
and #6 (brown)
Between terminals #1 (black)
and #3 (blue)
Between terminals #1 (black)
and #5 (yellow)
Parts Inspection
Output voltage
Parts to inspect
Between main circuit board's CN8-1 and CN1-3
Throttle valve
Between main circuit board's CN8-3 and CN1-3
Between main circuit board's CN8-2 and CN1-3
Between main circuit board's CN8-4 and CN1-3
onboard checker and wait for 5 minutes; then, with the power OFF, check the harness for
continuity and the junction connectors for contact failure using a tester.
Inspecting the mixer
Throttle valve
Measuring points
Measuring points
Fuel control
valve
1 2 3
4 5 6
Measured value
Between terminals #2 (red)
120 Ω
and #4 (white)
Between terminals #2 (red)
120 Ω
and #6 (brown)
Between terminals #1 (black)
120 Ω
and #3 (blue)
Between terminals #1 (black)
120 Ω
and #5 (yellow)
(Equivalent circuit of step motor)
S (Brown)
1
PM
+B (Red)
S (White)
3
THM
S (Blue) +B (Red) S
2
Inspecting the Outdoor Unit
Power supply ON
12 V DC
12 V DC
12 V DC
12 V DC
Throttle valve
1 2 3
4 5 6
020955-00E
Fuel control valve
Measuring points Measured value
GVM
(Yellow)
4
025943-00E
120 Ω
120 Ω
120 Ω
120 Ω
174