Flow temp. controller
C-31
Before test run (FTC2)
low temp. controller
5
C-31
FTC2
5.1. Check
After completing installation and the wiring and piping of the local application and outdoor units, check for refrigerant leakage, looseness in the power
supply or control wiring, wrong polarity, and no disconnection of one phase in the supply.
Use a 500-volt megohmmeter to check that the resistance between the power supply terminals and ground is at least 1.0MΩ.
Warning:
Do not use the system if the insulation resistance is less than 1.0MΩ.
Caution:
Do not carry out this test on the control wiring (low voltage circuit) terminals.
5.2. Self-check
1
Turn on the power.
2
Press [CHECK] button twice.
3
Press [CHECK] button twice to fi nish self-check.
A
CHECK button
B
IC : FTC2 unit OC : Outdoor unit
C
Check code
Check code Symptom
P1 Flow water (TH1) sensor error
P2 Refrigerant liquid Pipe (TH2) sensor error
P6 Freezing/Overheating protection operation
P9 Actual tank temp. (TH5) sensor error
Fb FTC2 unit control system error (memory error, etc.)
E0~E5 Signal transmission failure between remote controller and FTC2.
E6~EF Signal transmission failure between outdoor unit and FTC2.
– – – – No trouble generated in the past.
FFFF No corresponding unit
U*, F* Outdoor unit failure. Refer to the outdoor unit wiring diagram.
For description of each LED(LED1~5) provided on the FTC2, refer to the following table.
LED 1 (Power for microcomputer) Indicates whether control power is supplied. Make sure that this LED is always lit.
LED 2 (Power for remote controller) Indicates whether power is supplied to the remote controller. This LED lights only in the case of the FTC2
unit which is connected to the outdoor unit refrigerant address “0“.
LED 3
(Communication between FTC2 and outdoor unit)
Indicates state of communication between the FTC2 and outdoor unit. Make sure that this LED is always
blinking.
LED 4 for maintenance —
LED 5 for maintenance —
ON/OFF
TEMP.
ERROR CODE
5.3. Initial filling up
When the system is installed, the whole circuit must be filled with water. At this stage, Water circulation pump and 3-port valve shall be operated
individually.
Water circulation pump operates according to Dip SW 3-2 setting.
SW 3-2 Operation
OFF Water circulation pump is OFF.
ON
Water circulation pump is ON.
(It is switched OFF after 60 minutes consecutive operation.)
3-port valve operates according to Dip SW 3-3 setting.
SW 3-3 Operation
OFF 3-port valve is OFF.
ON
3-port valve is ON.
(It is switched OFF after 60 minutes consecutive operation.)
*NOTE
Even if you forget to reset the Dip SW settings above, the normal operation mode can be recovered automatically in 60 minutes.
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