Before Test Run - Mitsubishi Electric PAC-IF081B-E Installation Manual

6. Before test run

6.1. 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 wir-
ing, wrong polarity, and power cable is securely connected.
Use a 500-volt megohmmeter to check that the resistance between the power supply terminals and ground is at least 1.0 MΩ.
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.
6.2. 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.
Code Error
L3 Circulation water temperature overheat protection
L4 DHW tank water temperature overheat protection
Indoor unit temperature thermistor (THW1, THW2, THW5A, THW5B, THW6, THW7,
L5
THW8, THW9) failure
L6 Circulation water freeze protection
L8 Heating operation error
L9 Low primary circuit flow rate detected by flow sensor or flow switch (flow switches 1, 2, 3)
LA Pressure sensor failure
LB High pressure protection
LC Boiler circulation water temperature overheat protection
LD Thermistor (Boiler flow water temp.) (THWB1) failure
LE Boiler operation error
LF Flow sensor failure
LH Boiler circulation water freeze protection
LJ DHW operation error (type of external plate HEX)
LL Setting errors of DIP switches on FTC control board
LP Out of water flow rate range for outdoor heat pump unit
P1 Thermistor (Room temp.) (TH1) failure
P2 Thermistor (Ref. liquid temp.) (TH2) failure
P6 Anti-freeze protection of plate heat exchanger
J0 Communication failure between FTC and wireless receiver
J1 - J8 Communication failure between wireless receiver and wireless remote controller
J9 Communication failure between FTC (Main) and FTC (Sub).
E0 - E5 Communication failure between main remote controller and FTC
E6 - EF Communication failure between FTC and outdoor unit
E9 Outdoor unit receives no signal from indoor unit.
EE Combination error between FTC and outdoor unit
U*, F* Outdoor unit failure
A* M-NET communication error
Note: To cancel error codes, please switch system off (Touch [Reset] on main remote controller).
Error
Code : L
Unit : FTC Address :
Tel no. :
Reset
Action
Flow rate may be reduced. Check for;
• Water leakage
• Magnetic filter / 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.
Check and re-attach any thermistors that have become dislodged.
See Action for L3. If the flow sensor or flow switch itself does not work,
replace it.
Caution: The pump valves may be hot, please take care.
Check pressure sensor cable for damage or loose connections.
• Flow rate of the heating circuit may be reduced. Check water circuit.
• Plate heat exchanger may be clogged. Check the plate heat exchanger.
• Outdoor unit failure. Check refrigerant volume, valve, LEV coil and pipe
crushing of outdoor unit.
Check if the setting temperature of the Boiler for heating exceeds the re-
striction. (See the manual of the thermistors "PAC-TH012HT(L)-E".)
Flow rate of the heating circuit from the boiler may be reduced. Check for
• Water leakage
• Magnetic filter / Strainer blockage
• Water circulation pump function
Check resistance across the thermistor.
See Action for L8. Check the status of the boiler.
Check flow sensor cable for damage or loose connections.
Flow rate of the heating circuit from the boiler may be reduced. Check for
• Water leakage
• Magnetic filter / Strainer blockage
• Water circulation pump function
• Check for disconnection of thermistor (DHW tank lower water temp.) (THW5B).
• Flow rate may be reduced.
• Check for water circulation pump function. (primary / sanitary)
For boiler operation, check that DIP SW1-1 is set to ON (With Boiler) and
DIP SW2-6 is set to ON (With Mixing Tank).
For 2-zone temperature control, check DIP SW2-7 is set to ON (2-zone)
and DIP SW2-6 is set to ON (With Mixing Tank).
Check the Table 3.4.1
Check remote controller settings ([Service]→[Heat pump settings]→[Heat
pump flow rate range])
See Action for L3.
Check resistance across the thermistor.
Check resistance across the thermistor.
See Action for L3.
Check for correct amount of refrigerant.
Check connection cable for damage or loose connections.
Check wireless remote controller's battery is not flat.
Check the pairing between wireless receiver to wireless remote controller.
Test the wireless communication. (See the manual of wireless system.)
Check connection cable for damage or loose connections.
Check connection cable for damage or loose connections.
Check that the outdoor unit has not been turned off.
Check connection cable for damage or loose connections.
Refer to outdoor unit service manual.
Check both units are switched on. Check connection cable for damage or
loose connections. Refer to outdoor unit service manual.
Check combination of FTC and outdoor unit.
Refer to outdoor unit service manual.
Refer to outdoor unit service manual.
Error
Code : L
Unit : FTC Address :
Tel no. :
Reset error?
No Yes
32
en