Mitsubishi Heavy Industries FDT112KXZE1 Technical Manual Download

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'17 • KX-T-254

(b) Display to the remote control

(i) Central or each remote control basis, heating preparation: the smallest unit No. among the operating units in the

remote mode (or the center mode unless the remote mode is available) is displayed.

(ii) Inspection display, filter sign: Any of unit that starts initially is displayed.

(i) In case of RC-EX3 remote control

If you touch the buttons in the order of “Menu”

→

“Service setting”

→

“Service & Maintenance”

→

“IU address”

on the TOP screen of remote control, the indoor units which are connected are displayed.

(ii) In case of RC-E5 remote control

Pressing “AIR CON No.” button on the remote control displays the indoor unit address. If “

▲

” “

▼

” button is

pressed at the next, it is displayed orderly starting from the unit of smallest No.

(d) In case of anomaly

If any anomaly occurs on a unit in a group (a protective function operates), that unit stops with the anomalous stop but

any other normal units continue to run as they are.

(e)

Signal wiring procedure

Signal wiring between indoor and outdoor units should be made on each unit same as the normal wiring. For the group

control, connect the remote control wiring to each indoor unit via terminal block for the remote control.

Connect the remote control wiring separately from the power source cable or wires of other electric devices (AC220V or

higher).

(17) High ceiling control

When sufficient air flow rate cannot be obtained from the indoor unit which is installed at a room with high ceiling, the air flow

rate can be increased by changing the fan tap. To change the fan tap, use the indoor unit function “FAN SPEED SET” on the

wired remote control.

STANDARD
HIGH SPEED1

FAN SPEED SET

P-Hi1 - Hi

P-Hi1 - Me

P-Hi1 - Hi - Me

P-Hi2 - P-Hi1 - Hi - Me

Hi - ULo Hi - Me

Hi - Me - ULo

P-Hi2 - Hi - Me - ULo

Indoor unit air flow setting

Fan tap

HIGH SPEED2

P-Hi2 - Hi - Me - Lo Hi - Me - Lo

Hi - Lo

Hi - Me

Notes (1) Factory default is STANDARD.
(2) At the hot-start and heating thermostat OFF, or other, the indoor fan is operated at the low speed tap of each setting.
(3) This function is not able to be set with wireless remote controls or simple remote control (RCH-E3)

127

'16 • PAC-T-251

(18) Abnormal temperature thermistor (return air/indoor heat exchanger) broken wire/short-circuit detection

(a) Broken wire detection

When the return air temperature thermistor detects -20°C or lower or the heat exchanger temperature thermistor detect -40°C

or lower for 5 seconds continuously, the compressor stops. After a 3-minute delay, the compressor restarts but, if it is

detected again within 60 minutes after the initial detection for 6 minutes continuously, stops again (the return air temperature

thermistor: E7, the heat exchanger temperature thermistor: E6).

(b) Short-circuit detection

If the heat exchanger temperature thermistor detects 70°C or higher for 5 seconds continuously at 2 minutes and 20 seconds

after the compressor ON during cooling operation, the compressor stops (E6).

(19) External input/output control (CnT or CnTA)

External input/output connectors are provided on the indoor unit control PCB, and each input/output is possible to be changed by

RC-EX3. Be sure to connect the wired remote control to the indoor unit. Remote operation with CnT/CnTA only is not possible.

・

CnT

・

CnTA

XR1

XR3

XR4

CnT

Blue

12V

XR2

XR5

■

Priority order for combinations of CnT and CnTA input.

Note (1) Following operation commands are accepted when the operation prohibition is set with CnTA as indicated with *.
Individual operation command from remote control, test run command from outdoor unit and operation command from option device, CnT input.

Reference: Explanation on the codes and the combinations of codes in the table above

In case of CnT “Number”, the CnT “Number” is adopted and CnTA is invalidated.

In case of CnTA “Number”, the CnTA “Number” is adopted and CnT is invalidated.

In case of CnT “Number”/CnTA “Number”, the CnT “Number” and the CnTA “Number” become independent functions each other.

In case of CnT “Number” + CnTA “Number”, the CnT “Number” and the CnTA “Number” become competing functions each other.

In case of CnT “Number” > CnTA “Number”, the function of CnT “Number” supersedes that of CnTA “Number”.

In case of CnT “Number” < CnTA “Number”, the function of CnTA “Number” supersedes that of CnT “Number”.

(The “Number” above means

①

⑥

in the table.)

CnTA

Blue

12V

XR6

CnTA

①

Operation

stop level

②

Operation

stop pulse

③

Operation

permission/prohibition

④

Operation

permission/prohibition pulse

⑤

Cooling/heating

selection level

⑥

Cooling/heating

selection pulse

⑦

Emergency

stop

CnT

①

Operation stop level

CnT

①

②

Operation stop pulse

CnT

②

③

Operation permission/prohibition level CnT

③ >

CnTA

①

④

Operation permission/prohibition pulse CnT

④

⑤

Cooling/heating selection level CnT

⑤ /

CnTA

①

⑥

Cooling/heating selection pulse CnT

⑥ /

CnTA

①

CnT

①

CnT

②

CnT

③ >

CnTA

②

CnT

④

CnT

⑤ /

CnTA

②

CnT

⑥ /

CnTA

②

CnT

① +

CnTA

②

CnT

② +

CnTA

③

CnT

③ +

CnTA

③

CnT

④ +

CnTA

③※

CnT

⑤ /

CnTA

③※

CnT

⑥ /

CnTA

③

(a) Output for external control (remote display)

Following output connectors (CnT) are provided on the indoor control PCB for monitoring operation status.

①

Operation output:

Outputs DC12V signal for driving relay during operation

②

Heating output:

Outputs DC12V signal for driving relay during heating operation

③

Compressor ON output:

Outputs DC12V signal for driving relay when compressor is operating.

④

Error output:

Outputs DC12V signal for driving relay when anomalous condition occurs.

(b) Remote operation input

Remote operation input connector (CnT-6 or CnTA) is provided on the indoor control PCB.

However remote operation by CnT-6 or CnTA is not effective, when “Center mode” is selected by central control.

Only the “LEVEL INPUT” is acceptable for external input

, however when the indoor function setting of “Level

input (Factory default)” or “Pulse input” is selected by the function for “External input” of the wired remote control,
operation status will be changed as follows.

CnT

①

CnT

②

CnT

③

CnT

④

CnT

⑤ /

CnTA

④