Checking Component Parts' Function - Mitsubishi Electric EHST20C-VM2C.UK Service Manual

10-6. Checking component parts' function

Water circulation pump (primary circuit)
Signal cable
3
M
1~
3
Power cable
<Recommended water flow rate range>
Outdoor heat pump unit
Packaged model PUHZ-W50
PUHZ-W85
PUHZ-W112
PUHZ-HW112
PUHZ-HW140
Split model SUHZ-SW45
PUHZ-SW40
PUHZ-SW50
PUHZ-FRP71
PUHZ-SW75
PUHZ-SW100
PUHZ-SW120
PUHZ-SHW80
PUHZ-SHW112
PUHZ-SHW140
Water circulation pump (sanitary circuit)
L
Immersion heater
OCH570
Part Name
BROWN
PWM input signal
BLUE
Signal ref.
BLACK
Feedback signal
BROWN
L
BLUE
N
GREEN/
YELLOW
Water flow rate range [L/min]
7.1-14.3
10.0-25.8
14.4-27.7
14.4-27.7
17.9-27.7
7.1-12.9
7.1-11.8
7.1-17.2
11.5-22.9
10.2-22.9
14.4-27.7
20.1-27.7
10.2-22.9
14.4-27.7
17.9-27.7
N
M
1~
<Water circulation pump (primary circuit) characteristics>
EHST20C series
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.0 5.0
EHST20D series
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.0 5.0
EHPT20X series
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.0 5.0
Measure the resistance between the terminals with a tester.
(Winding temperate 20°C)
Terminal
L-N 211 Ω
DHW circulation pump MUST be set to speed 2.
Measure the resistance between the terminals with a tester.
(Winding temperate 20°C)
Terminal
A-B 19.2 Ω
To reset the immersion heater use a pin or similar to press the reset button lo-
cated on the top of the immersion boss.
See diagram on the left.
57
Check Points
Speed 5 (Default setting)
Speed 4
Speed 3
Speed 2
Speed 1
10.0 15.0 20.0 25.0 30.0
Flow rate [L/min]
Speed 5 (Default setting)
Speed 4
Speed 3
Speed 2
Speed 1
10.0 15.0 20.0 25.0 30.0
Flow rate [L/min]
Speed 5 (Default setting)
Speed 4
Speed 3
Speed 2
Speed 1
10.0 15.0 20.0 25.0 30.0
Flow rate [L/min]
Normal (speed 2) Abnormal
Open or Short
Normal Abnormal
Open or Short
35.0 40.0
35.0 40.0
35.0 40.0