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9-1. Matters to be confirmed first
9-1-1. Check the power supply voltage
Check that the power supply voltage is AC230 V±23 V. If the power supply voltage is not in this range, it may not
operate normally.
9-1-2. Check for any miswiring of the connection cables between
the hydro unit and the outdoor unit
The hydro unit and the outdoor unit are connected with three connection cables. Make sure the interconnecting
connections between the hydro unit and the outdoor unit terminal blocks are connected to the correct terminal
numbers. If not connected correctly, the heat pump system does not operate. However, a miswiring would not
cause damage to the equipment.
9-1-3. About the installation of the temperature sensor
If each sensor is removed due to the replacement of the water heat exchange or inverter board, or the replacement
of the refrigeration cycle parts, make sure to put the sensor back to the position where it was before.
• Each sensor position has a marking. Make sure to put it back to the exact position.
• Make sure to install it with a sensor holder so that the temperature sensing part of the sensor and the straight
part of the copper piping are attached with each other tightly.
• If the installation of the sensor is incomplete or the installed position is wrong, it will not perform a normal control
operation and may cause a defect such as a malfunction of the equipment or an occurrence of an abnormal
sound, etc.
9-2.
Non-defective operation (program operation) … No fault
code display appears.
In order to control the heat pump unit, there are the following operations as the built-in program operations in the
microcomputer. If a claim occurs about the operation, please confirm whether it falls under any of the contents in
the following table.
If it does, please understand that the symptom is not a defect of the equipment, and it is an operation necessary
for the control and maintenance of the heat pump unit.
Table 9-2-1 Non-defective operation
No. Operation of the heat pump system Explanation
1
The compressor sometimes does not operate even within the
range of compressor “ON”.
The compressor does not operate during the operation of the
compressor reboot timer (3 min). Even after the power
activation, the compressor reboot timer continues to be active.
2
During the hot water supply or heating operation, without
reaching the set temperature, the compressor operation
frequency stays at a frequency of less than the maximum Hz or
lowers down.
It may be caused by the high temperature release control
(release protection control by the temperature of the water
heat exchanger) or the current release control.
3
The “Stop” operation on the remote control will not stop the
circulating pump. (The same for hot water supply, heating and
cooling)
In order to deal with the temperature increase in the heat
exchanger after stopping, the operation continues for 1 min
after the compressor is stopped.
4
“ON” on the remote control will not operate the compressor. (It
will not operate even after the reboot delay timer elapsed)
When the outdoor temperature (TO sensor detection
temperature) is -20°C or lower, the heat pump will not operate
in order to protect the compressor, and the heater will operate
instead.
5
When the power is turned on, it starts operation without
operating the remote control.
• The auto restart operation may be working.
• The antifreeze operation may be working.
• If the TWI, TWO or THO sensor detects a temperature
below 4°C, the operation changes from circulating pump
--->> circulating pump + heater.)
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 65 Monday, October 5, 2009 2:09 PM