Mitsubishi Electric EHSD-MEE - Page 59

Part Name Checkpoints
Earth leakage circuit breaker for heater 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.
Relay for heater
R S T A1 A2
U V W
When the applied voltage is not 230 VAC across the terminals A1-A2, check the terminals
R-U, S-V, and T-W are open.
When the applied voltage is 230 VAC across the terminals A1-A2, check the terminals
R-U, S-V, and T-W are short.
Booster heater Measure the resistance between the terminals with a multimeter.
Thermostat (90°C) and thermal cut out (121°C)
90 °C
Manual reset
water
thermostat
121 °C
Thermal
cut-out
AWG18 AWG18
9
10
Terminal Normal Abnormal
9–10 80(±20) mΩ Open or Short
2 kW heater (230 V, 1 phase)
1
2
2 kW
AWG15 FEP WHITE AWG15 FEP WHITE
Terminal Normal Abnormal
1–2 26.5(+3/−1.3) Ω Open or Short
2 + 4 kW heater (230 V, 1 phase)
1
2
2 kW
AWG15 FEP WHITE AWG15 FEP WHITE
3
4
2 kW
AWG13 FEP BLUE AWG13 FEP
BLUE
2 kW
Terminal Normal Abnormal
1–2 26.5(+3/−1.3) Ω Open or Short
3–4 13.3(+1.5/−0.6) Ω Open or Short
3 + 6 kW heater (400 V, 3 phase)
Terminal Normal Abnormal
1–2=2–3=1–3 105.8(+11.8/−5) Ω Open or Short
4–5=5–6=4–6 52.9(+5.8/−2.5) Ω Open or Short
3 + 6 kW heater (230 V, 3 phase)
Terminal Normal Abnormal
1–2=2–3=3–1
35.3(+3.9/−1.8) Ω Open or Short
4–5=5–6=6–4 17.6(+1.9/−0.9) Ω Open or Short
59
5 6
AWG13 FEP BLUE AWG13 FEP BLUE
AWG15 FEP WHITE
4
AWG13 FEP BLUE
2 kW 2 kW
2 31
1 kW 1 kW
AWG15 FEP WHITE AWG15 FEP WHITE
2 kW
1 kW
5 6
AWG13 FEP BLUE AWG13 FEP BLUE
AWG15 FEP WHITE
2 kW
4
AWG13 FEP
BLUE
2 kW 2 kW
2 3
1 kW
1
1 kW 1 kW
AWG15 FEP WHITE AWG15 FEP WHITE
OCH815A