Checking Component Parts' Function - Mitsubishi Electric EHST20C-VM6HB Service Manual

10-6. Checking component parts' function

Water circulation pump
Signal cable
3
M
1~
3
Power cable
GREEN/
YELLOW
<Recommended water flow rate range>
Outdoor heat pump unit
Packaged
PUHZ-W50
PUHZ-W85
PUHZ-HW11
PUHZ-HW140
Split PUHZ-RP5
PUHZ-RP50
PUHZ-RP60
PUHZ-(H)RP71
PUHZ-(H)RP100
PUHZ-(H)RP15
PUHZ-RP140
PUHZ-SW40
PUHZ-SW50
PUHZ-SW75
PUHZ-SW100
PUHZ-SW10
PUHZ-SHW80
PUHZ-SHW11
PUHZ-SHW140
Immersion heater
OCH531
Part Name
BROWN
PWM input signal
BLUE
Signal ref.
BLACK
Feedback signal
BROWN
L
BLUE
N
Water flow rate range [L/min]
7.1 - 14.
10.0 - 5.8
14.4 - 7.7
17.9 - 7.7
7.1 - 11.8
7.1 - 17.
8.6 - 0.1
10. - .9
14.4 - 7.7
17.9 - 7.7
0.1 - 7.7
7.1 - 11.8
7.1 - 17.
10. - .9
14.4 - 7.7
0.1 - 7.7
10. - .9
14.4 - 7.7
17.9 - 7.7
<Water circulation pump characteristics>
<EHST0 series>
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.0
<EHPT20 series (with PUHZ-W50)>
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.0
<EHPT20 series (with PUHZ-W85)>
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.0
<EHPT20 series (with PUHZ-W112)>
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.0
Measure the resistance between the terminals with a tester.
(Winding temperate 20°C)
Terminal
19.2 Ω
A-B
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.
65
Check Points
Speed 5 (Default setting)
Speed 4
Speed 
Speed 
Speed 1
5.0 10.0 15.0 20.0 25.0 30.0
Flow rate [L/min]
Speed 5 (Default setting)
Speed 4
Speed 
Speed 
Speed 1
5.0 10.0 15.0 20.0 25.0 30.0
Flow rate [L/min]
Speed 5 (Default setting)
Speed 4
Speed 
Speed 
Speed 1
5.0 10.0 15.0 20.0 25.0 30.0
Flow rate [L/min]
Speed 5 (Default setting)
Speed 4
Speed 
Speed 
Speed 1
5.0 10.0 15.0 20.0 25.0 30.0
Flow rate [L/min]
Normal Abnormal
Open or Short
35.0
35.0
35.0
35.0