Mitsubishi Heavy Industries FDCW100VNX, Technical Manual

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Installation
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3. DRAIN PIPING WORK
○ There are 3 drain holes provided on the bottom plate of an outdoor unit to discharge
condensed water.
○ When condensed water needs to be led to a drain, etc., install the unit on a flat base
(supplied separately as an optional part) or concrete blocks.
○ Connect a drain elbow as shown in the illustration and close the other two drain holes
with grommets.
Drain elbow ( 1 pc.)
Drain grommet
( 2 pcs.)
Hard vinyl chloride pipe for general purpose (VP-16)
●
Execute drain piping by using a drain elbow and drain grommets supplied separately as
optional parts, where water drained from the outdoor unit is a problem.
L N
1 2 3
L N 2 3 PE
Outdoor Unit
Indoor Unit （X 2 terminal ）
4. ELECTRICAL WIRING WORK
For details of electrical cabling, refer to the indoor unit installation manual.
●
Connect a pair bearing a common terminal number with an indoor-outdoor connecting wire.
●
In cabling, fasten cables securely so that no external force may work on terminal connections.
●
Grounding terminals are provided in the control box.
●
Always perform grounding system installation work
with the power cord unplugged.
Power cable, indoor-outdoor connecting wires
Electrical installation work must be performed by an electrical installation service provider qualified by a power provider of the country.
Electrical installation work must be executed according to the technical standards and other regulations applicable to electrical
installations in the country.
●
Ground the unit. Do not connect the grounding wire to a gas pipe, water pipe, lightning rod or telephone grounding wire.
If impropery grounded, an electric shock or malfunction may result.
●
A grounding wire must be connected before connecting the power cable. Provide a grounding wire longer than the power cable.
●
Do not lay electronic control cables (remote control and signaling wires) and other cables together outside the unit. Laying them
together can result in the malfunctioning or a failure of the unit due to electric noises.
●
Fasten cables so that may not touch the piping, etc.
●
When cables are connected, make sure that all electrical components within the electrical component box are free of loose
connector coupling or terminal connection and then attach the cover securely. (Improper cover attachment can result in
malfunctioning or a failure of the unit, if water penetrates into the box.)
○ It is attached on the back side of the service panel.
○ As like the refrigerant pipe, it can be let out in any of the following directions: side right, front,
rear and downward.
Power source, signal line and ground terminal block
Wiring guide
Wiring diagram
Outgoing cable direction
5) The state of the electronic expansion valve.
The following table illustrates the steady states of the electronic expansion valve.
Valve for a cooling operation
During a cooling operation
When power is turned on
When the unit comes to a normal stop When the unit comes to an abnormal stop
Valve for a heating operation
During a heating operation During a cooling operation During a heating operation
Complete shut position
Full open position
Full open position
Full open position
Complete shut position
Full open position
Full open position
Complete shut position
Full open position
Full open position
All set to OFF for shipment
SWITCHES FOR ON-SITE SETTING
SW3
ON
1 2 3 4
6) Heed the following on the first operation after turning on the power supply.
This outdoor unit may start in the standby mode (waiting for a compressor startup), which can continue up to 30 minutes, to prevent the oil level
in the compressor from lowering on the first operation after turning on the circuit breaker. If that is the case, do not suspect a unit failure.
5. COMMISSIONING
For details of commissioning, refer to the Indoor unit installation manual
3) Setting SW3-1, SW3-2, on-site
(1) Defrost control switching (SW3-1)
・
When this switch is turned ON, the unit will run in the defrost mode more frequently.
・
Set this switch to ON, when installed in a region where outdoor temperature falls below zero during the season the unit is run for a heating operation.
(2) Snow guard fan control (SW3-2)
・ When this switch is turned on, the outdoor unit fan will run for 10 seconds in every 10 minutes, when outdoor temperature falls to 3 ℃ or lower and the compressor is not running.
・ When the unit is used in a very snowy country, set this switch to ON.
2) Checking the state of the unit in operation
Use check joints provided on the piping before and after the four-way valve installed
inside the outdoor unit for checking discharge pressure and suction pressure.
As indicated in the table shown on the right, pressure detected at each point will
vary depending on whether a cooling or heating operation has been selected.
● Before conduct a test run, make sure that the operation valves are open.
● Turn on power 6 hours prior to a test run to energize the crank case heater.
Do not turn on the power when the ambient temperature is below
−
20
℃
to avoid breakdown of electronic
component.
● In case of the first operation after turning on power, even if the unit does not operate for 30 minutes, it is
not a breakdown.
● Always give a 3-minute or longer interval before you start the unit again whenever it is stopped.
● Removing the service panel will expose high-voltage live parts and high-temperature parts, which are quite
dangerous.
Take utmost care not to incur an electric shock or burns. Do not leave the unit with the service panel open.
● When you operate switches (SW3) for on-site setting, be careful not to touch a live part.
● You cannot check discharge pressure from the liquid operation valve charge port.
● The 4-way valve (20S) is energized during a heating operation.
● When power supply is cut off to reset the unit, give 3 minutes or more before you turn on power again
after power is cut off. If this procedure is not observed in turning on power again, “Communication
error between outdoor and indoor unit” may occur.
Check item Check Item
Electric
wiring
Refrigerant
plumbing
WARNING
CAUTION
1) Test run method
Refer fo the indoor unit installatio n manual.
Cooling
operation
Heating
operation
Discharge pressure
(High pressure)
Suction pressure
(Low pressure)
Suction pressure
(Low pressure)
Discharge pressure
(High pressure)
Charge port of the
gas operation valve
Check joint of the pipe
● When you leave the outdoor unit with power supplied to it,
be sure to close the panel.
Were air-tightness test and vacuum extraction surely performed?
Are heat insulation materials installed on both liquid and gas pipes?
Are operation valves surely opened for both liquid and gas systems?
Is the unit free from cabling errors such as uncompleted connection, or reversed phase?
Doesn’t cabling cross-connect between units, where more than one unit are installed?
Do indoor-outdoor connecting cables connect between the same terminal numbers?
Is the unit grounded with a dedicated grounding wire not connected to another unit’s grounding wire?
Are cables free from loose screws at their connection points?
Are cables held down with cable clamps so that no external force works onto terminal connections?
2
4
A failure to observe these instructions can result in a compressor breakdown.
Item No.used in the
installation manual
Items to checkbefore a test run
● If an error code other than those listed above is indicated, refer to the wiring diagram of the outdoor unit and the indoor unit.
Action Failure event
Open phase
63H1 actuation or operation with operation valves shut
(occurs mainly during a heating operation)
Low pressure error or operation with operation valves shut
(occurs mainly during a cooling operation)
1. Check whether the operation valves are open.
2. If an error has been canceled when 3 minutes have elapsed since a
compressor stop, you can restart the unit by effecting Check Reset
from the remote control unit.
Printed circuit board LED(The cycles of 5 seconds)
Red LED
Blinking once
Blinking once
Blinking once
4) Failure diagnosis in a test run
Check power cables for loose contact or disconnection E34
E40
E49
OU phase error
HP alarm
LP alarm
Green LED
Blinking continuously
Blinking continuously
Blinking continuously
Error Code in Error Log Indoor Unit Display
Outdoor unit installation