Mitsubishi Electric PAC-IF013B-E Installation Manual page 11

5 Input and Output
5.2.2 Requirements and guides regarding defrost and pre-defrost signal
(1) Do NOT input STEP 0 during defrost operation and while pre-defrost signal is ON.
(2) After pre-defrost signal becomes ON, do NOT change capacity step request until defrost operation finishes.
If you change capacity step after pre-defrost signal is ON, outdoor unit may stop starting defrosting and frost may become big.
(3) Pre-defrost signal becomes OFF before defrost operation finishes. Using both OUT4 (Defrost signal) and OUT8 (Pre-defrost signal) is recommended if
you use pre-defrost signal. (See figure 5-2.)
OUT8 (Pre-defrost signal) is ON
More than
1 min
Heating operation
(4) Regarding the delayed (balaced) defrost function and the pre-defrost signal, if you change outdoor unit
from non-adaptable to adaptable model, initialization of the function setting on the remote controller is
necessary.
• First, select "Menu" → "Service" → "Check" → "Request code" on the remote controller.
• Second, set the refrigerant address of the outdoor unit which is changed from non-adaptable to
adaptable.
• Third, select "Request code" item with the F1 or F2 button and set "200" with F3 or F4 button.
• Then, press the button. The function settings are initialized.
Note: You have to set the function settings after this initialization, if necessary.
5.2.3 Requirement regarding operation mode setting
(1) Do NOT change operation mode frequently.
5.2.4 Thermistor characteristics
• Target air temp. thermistor (TH1)
• Ref. liquid temp. thermistor (TH2)
• 2-Phase temp. thermistor (TH5)
• HEX inlet (Coil on) temp. thermistor (TH11)
Thermistor R0 = 15kΩ ± 3%
B constant = 3480 ± 2%
1
Rt = 15exp {3480 ( 273+t – 273 )}
0°C 15 kΩ
10°C 9.6 kΩ
20°C 6.3 kΩ
25°C 5.2 kΩ
30°C 4.3 kΩ
40°C 3.0 kΩ
5.2.5 Central control (M-NET connection)
The central control (M-NET converter and A-control sub Interface connection between outdoor unit(s) and MELANS/BMS ) is available ONLY when capacity
setting (DIP SW1 and SW6) is "No input (Auto step mode)" and return/room air temp. control is selected (DIP SW 1-7 is ON).
OUT4 (Defrost signal) is ON
Defrost operation
<Fig. 5-2>
1
Heating operation
Time
50
40
30
20
10
0
-20 -10 0 10 20 30 40 50
Request code
Ref.address
Request code
Request:
－ ＋
Cursor
F1 F2 F3 F4
Temperature (:)
11