L
Signal cable
3
3
Power cable
BROWN PWM input signal
Feedback signal
Signal ref.
BLUE
BROWN
GREEN/
YELLOW
BLUE
BLACK
M
1~
N
53
<Recommended water flow rate range>
<Water Circulation Pump Characteristics>
Outdoor heat pump unit
Water flow rate range [L/min]
PUHZ-SW160
23.0–61.5
PUHZ-SW200
28.7–61.5
PUHZ-SHW230
28.7–61.5
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.
0.0
20.0
40.0
60.0
80.0
100.0
120.0
140.0
0.0
50.0 60.0 70.0 80.0 90.0
10.0 20.0 30.0 40.0
EHSE/ERSE series
External
static
pressure
[kPa]
Flow rate [L/min]
Speed 5 (Default setting)
Speed 4
Speed 3
Speed 2
Speed 1
5
6
AWG13 FEP BLUE
AWG13 FEP BLUE
AWG15 FEP WHITE
2kW
4
AWG13 FEP BLUE
2kW
2kW
2
3
1kW
1
1kW
1kW
AWG15 FEP WHITE
AWG15 FEP WHITE
10-6. Checking Component Parts' Function
Part Name
Check Points
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 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.
Booster heater
Measure the resistance between the terminals with a tester.
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
110(±35)mΩ
Open or Short
3 + 6 kW heater (400V, 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
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OCH590B
