Inspecting The Thermostat - Daikin GYEQ20AN Service Manual

SiAUY361411EA
Inspect the water motor-operated valve by measuring the resistance between its connectors.
Measuring points
Between terminals #2 (red) and #4 (pink)
Between terminals #1 (amber) and #2 (red)
Between terminals #2 (red) and #6 (yellow)
Between terminals #2 (red) and #3 (blue)

1.18 Inspecting the Thermostat

Put the thermostat in a container filled with water. While heating the water with an electric
heater, measure the temperature and check when the valve begins opening and when it
becomes fully open.
∗ Because liquid packing is applied to the thermostat components before they are assembled,
Parts Inspection
Inspecting the water motor-operated valve
Thermostat
60°C
71°C
do not reuse the components after disassembly. Use new thermostat components.
Thermostat
71°C
Harness
Yellow White Orange
-
Blue Brown
Pink
Orange
Red
(COM)
Begins opening
60°C
71°C
Thermometer
Inspecting the Outdoor Unit
Measured value
70Ω
70Ω
70Ω
70Ω
MV
Blue Red Orange
-
Yellow Pink
CN18
2
White
3
4
Brown
5 Blue
6
Orange
7 Yellow
M
Yellow Blue
028042-00E
Fully open
75°C
85°C
Thermostat
60°C
023468-00E
Thermostat
Electric heater
023469-00E
186