Before Test Run - Mitsubishi Electric PAC-IF032B-E Installation And Operation Manual

. Before test run

Code LED4 LED5
L3 Light up Light up
L4 Blink Blink
L5 Blink Light down Thermistor (Return water temp.) (THW2)
L6 Light up Blink
L8 Light down Light up
L9 Light up Light down
P1 Blink Light down Thermistor (Flow water temp.) (THW1) failure
P2 Light down Blink
P6 Blink Light up
P9 Blink Light down Thermistor (Tank water temp.) (THW5) failure
E0, E3,
— —
E4, E5
E1, E2
E6 - EF — —
U*, F* — —
Note: For the system using a local controller (External input: Contact signal), you cannot cancel an error with the remote controller.
When all of the IN4 to IN inputs are not received, the error will be cancelled.
For description of each LED (LED1 to 3) provided on the FTC2B, refer to the following table.
LED 1 (Power for microcomputer)
LED 2 (Power for remote controller)
LED 3 (Communication between FTC2B and outdoor unit)
22
Error
Circulation water temperature overheat protection
DHW tank water temperature overheat protection
Circulation water freeze protection
Heating operation error
Low primary circuit flow rate detected by flow switch (flow
switch)
Thermistor (Ref. liquid temp.) (TH2) failure
Anti-freeze protection of plate heat exchanger
Communication failure between remote controller and FTC2B
Remote controller board error
Communication failure between FTC2B and outdoor unit
Outdoor unit failure
Indicates whether control power is supplied. Make sure that this LED is always lit.
Indicates whether power is supplied to the remote controller. This LED lights only in the case of the FTC2B
unit which is connected to the outdoor unit refrigerant address "0".
Indicates state of communication between the FTC2B and outdoor unit. Make sure that this LED is always blinking.
.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 con-
trol wiring, wrong polarity, and power cable is securely connected.
Use a 500-volt megohmmeter to check that the resistance between the power sup-
ply 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) termi-
nals.
.2. Self-check
When an error occurs when power is applied or during operation
■ Indication of error details
The code, unit, address, and telephone number are displayed.
The telephone number is displayed if registered.
■ Resetting the error
Press the F4 (RESET) button, and the F3 (Yes) button to reset the current error.
Flow rate may be reduced check for;
• Water leakage
• Strainer blockage
• Water circulation pump function (Error code may display during
filling of primary circuit, complete filling and reset error code.)
Check the immersion heater and it's contactor.
Check resistance across the thermistor.
See Action for L3.
Re-attach any thermistors that have become dislodged.
See Action for L3. If the flow switch itself does not work, replace it.
Caution: The pump valves may be hot, please take care.
Check resistance across the thermistor.
Check resistance across the thermistor.
See Action for L3.
Check for correct amount of refrigerant.
Check resistance across the thermistor.
Check connection cable for damage or loose connections.
Replace remote controller.
Check that the outdoor unit has not been turned off.
Check connection cable for damage or loose connections.
Refer to outdoor unit service manual.
Refer to outdoor unit service manual.
Action