Checking Component Parts' Function - Mitsubishi Electric EHSE-YM9EC Service Manual

10-6. Checking Component Parts' Function

Part Name
BROWN
Signal cable
BLUE
3
BLACK
M
1~
BROWN
BLUE
3
Power cable
GREEN/
YELLOW
<Recommended water flow rate range>
Outdoor heat pump unit Water flow rate range [L/min]
PUHZ-SW160
PUHZ-SW200
PUHZ-SHW230
If the water flow rate exceeds 61.5 L/min, the flow speed will be
greater than 1.5 m/s, which could erode the pipes.
Earth leakage circuit breaker for heater
Relay for heater
R S T
U V W
Booster heater
Thermostat (90°C) and thermal cut out (121°C)
121 °C 90 °C
Manual reset
Thermal
cut-out water
thermostat
9 10
3 + 6 kW heater (400V, 3 phase)
1kW
1kW 1kW
1 2 3 4
OCH590B
PWM input signal
Signal ref.
Feedback signal
L
N
23.0–61.5
28.7–61.5
28.7–61.5
A1 A2
2kW
2kW 2kW
5 6
<Water Circulation Pump Characteristics>
EHSE/ERSE series
140.0
120.0
100.0
80.0
60.0
40.0
20.0
0.0
0.0 10.0 20.0 30.0
If a short circuit occurs on the booster heater, immersion heater, or each power line, a
short-circuit breaker will trip and power source will be blocked.
Eliminate the causes of short circuit and then turn on the breaker again.
When the applied voltage is not 230 V AC across the terminals A1-A2, check the terminals
R-U, S-V, and T-W are open.
When the applied voltage is 230 V AC across the terminals A1-A2, check the terminals
R-U, S-V, and T-W are short.
Measure the resistance between the terminals with a tester.
Terminal
9–10 110(±35)mΩ
Terminal
1–2=2–3=1–3 105.8(+11.8/−5)Ω
4–5=5–6=4–6 52.9(+5.8/−2.5)Ω
53
Check Points
Speed 5 (Default setting)
Speed 4
Speed 3
Speed 2
Speed 1
40.0 50.0 60.0 70.0
Flow rate [L/min]
Normal Abnormal
Open or Short
Normal Abnormal
Open or Short
Open or Short
Continue to the next page
80.0 90.0