Mitsubishi Electric EHSC-VM6A, Руководство по обслуживанию

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10-6. Checking Component Parts' Function
Part Name Check Points
Water circulation pump Measure the resistance between the terminals with a tester.
(Winding temperate 20 °C)
Terminal Normal Abnormal
L - N 121 Ω Open or Short
Earth leakage 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 230V AC across the terminals A1-A2, check the terminals
R-U, S-V, and T-W are open.
When the applied voltage is 230V AC across the terminals A1-A2, check the terminals
R-U, S-V, and T-W are short.
L
M
1~
N
Outdoor heat pump unit Water fl ow rate range [L/min]
Packaged PUHZ-W50 7.1 - 14.3
PUHZ-W85 10.0 - 25.8
PUHZ-HW112 14.4 - 27.7
PUHZ-HW140 17.9 - 27.7
Split PUHZ-RP35 7.1 - 11.8
PUHZ-RP50 7.1 - 17.2
PUHZ-RP60 8.6 - 20.1
PUHZ-(H)RP71 10.2 - 22.9
PUHZ-(H)RP100 14.4 - 27.7
PUHZ-(H)RP125 17.9 - 27.7
PUHZ-RP140 20.1 - 27.7
* I f the water fl ow rate is less than 7.1 L/min, the fl ow switch will be activated.
If the water fl ow rate exceeds 27.7 L/min, the fl ow speed will be greater than
1.5 m/s, which could corrode the pipes.
<Recommended water fl ow rate range>
<Water Circulation Pump Characteristics>
EHSC series
EHPX series
speed3
(Default setting)
speed2
speed1
External static pressure[kPa]
0
10
20
30
40
50
60
70
80
0
Flow rate[L/min] Flow rate[L/min]
30 40 10 20 50
0 30 40 10 20 50
External static pressure[kPa]
0
10
20
30
40
50
60
70
80
speed3
(Default setting)
speed2
speed1
24 Heating emitter is hot in
the DHW mode. (The room
temperature rises.)
1. The 3-way valve may have foreign objects in it, or hot
water may
fl ow to the heating side due to malfunctions.
1. Manually override the 3-way valve several times to check
whether the problem will be solved. (Refer to the service
manual.) If the problem persists replace the 3-way valve
coil with a new one. If still no change replace the entire
3-way valve with a new one.
2. 2-way valve ( fi eld supply) has tripped. 2. Check the cause of the trip and check plumbing/wiring to
2-way valve (
fi eld suppl).
25
The hydrobox that was
running in the heating
mode before power
failure is running in the
DHW mode after power
recovery.
The hydrobox is designed to run in an operation mode with
a higher priority (i.e. DHW mode in this case) at power
recovery. Normal operation.
After the DHW max. operation time has elapsed or the DHW
max. temperature has been reached, the DHW mode switches
to the other mode.
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