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Setting Temperature Control; Dip-Switch Function; Initial Setting And Test Run - Mitsubishi Electric PAC-AH125 Installation Manual

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8.3. Setting temperature control

1
Thermostat condition in controlling the discharge air temperature
TH21: Discharge air temperature
TH24: Suction air temperature
To: The preset temperature on the remote controller
* The value indicated by boldface in the table below can be changed by a
dip-switch.
<Cooling>
The range of "To"
14 ~ 30 °C
Thermostat OFF
a) TH24 < To
b) TH24 < 14 °C
a) or b) or c)
c) TH21 < To – 2 °C is continued for 10 minutes.
Thermostat ON
a) TH24 > To +1 °C
b) TH24 > 15 °C
a) & b) & c) & d)
c) TH21 > To +1 °C
d) It passes from thermostat OFF for 3 minutes.
<Heating>
The range of "To"
17 ~ 28 °C
Thermostat OFF
a) TH24 > To
b) TH24 > 15 °C
a) or b) or c)
c) TH21 > To + 3 °C is continued for 10 minutes.
Thermostat ON
a) TH24 < To –1 °C
b) TH24 < 14 °C
a) & b) & c) & d)
c) TH21 < To –1 °C
d) It passes from thermostat OFF for 3 minutes.
2
Thermostat condition in controlling the suction/return air temperature
TH21: Suction/Return air temperature
TH24: Suction air temperature
To: The preset temperature on the remote controller
* The value indicated by boldface in the table below can be changed by a
dip-switch.
<Cooling>
The range of "To"
14 ~ 30 °C
a) TH24 < 20 °C
Thermostat OFF
a) or b)
b) TH21 < To – 0.5 °C
a) TH24 > 21 °C
Thermostat ON
b) TH21 > To +0.5 °C
a) & b) & c)
c) It passes from thermostat OFF for 3 minutes.
<Heating>
The range of "To"
17 ~ 28 °C
a) TH24 > 21 °C
Thermostat OFF
b) TH21 > To

9. Initial setting and test run

After the installation work, which was performed in accordance with the outdoor
unit installation manual, and after the AHU refrigerant piping work, drain piping
work, electrical wiring work, AHU controller wiring work, and switch setting, turn
on the main power at least 12 hours before starting operation in accordance with
the outdoor unit installation manual.
Test run, initial setting
1
Start the fan of AHU.
2
Remove the switch connector inside the controller.
3
Start AHU using the remote controller.
4
Set the operation mode to cooling mode, and set the temperature to 14 °C.
5
Check that cool air blows.
6
Stop AHU using the remote controller.
7
Connect the switch connector as it was.
8
Close the contact A1/A2 (close: ON, open: off)
[Fig. 9.0.1] (P.5)

8.4. Dip-switch function

1
Change of discharge or suction air temperature control
Dip switch
Thermostat control
SW7-2
OFF
Suction / return
ON
Discharge
2
TH21
Detection temperature of the thermistor TH21 is replaced to the value below
by Dip switch on the control board.
Dip switch
Detection temperature
SW1-2
SW1-3
Cooling
OFF
OFF
TH21
ON
OFF
TH21-1
OFF
ON
TH21-2
ON
ON
TH21-3
3
TH24
i) Discharge air temperature control
<Cooling>
Dip switch
Thermostat condition of TH24
SW3-10
Thermo-OFF
OFF
14 °C
ON
20 °C
<Heating>
Dip switch
Thermostat condition of TH24
SW3-8
SW3-9
Thermo-OFF
OFF
OFF
21 °C
ON
OFF
N/A
OFF
ON
10 °C
ON
ON
15 °C
ii) Suction/return air temperature control
<Cooling>
Dip switch
Thermostat condition of TH24
SW1-8
Thermo-OFF
OFF
20 °C
ON
15 °C
<Heating>
Dip switch
Thermostat condition of TH24
Thermo-OFF
Notes:
After 16-minute or more cooling operation, and when 1 °C or less of the
thermistor detection temperature for liquid pipe is detected for 3 minutes in
a row, the linear expansion valve will be closed to prevent freezing. The
operation will be normal when either of the following conditions is met.
When 3 minutes have passed after 10 °C or more of the thermistor
detection temperature for liquid pipe is detected.
When 6 minutes have passed after the expansion valve was closed to
prevent freezing.
Remarks
Initial setting
Remarks
Heating
TH21
Initial setting
TH21+1
TH21+2
TH21+3
Remarks
Thermo-ON
15 °C
Initial setting
21 °C
Remarks
Thermo-ON
20 °C
N/A
9 °C
14 °C
Initial setting
Remarks
Thermo-ON
21 °C
Initial setting
16 °C
Remarks
Thermo-ON
13

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