AHU Controller Specifications
1. Application
This controller is used to set up a system by connecting a field-supplied Air Handling Unit (AHU) to Mitsubishi
Electric City Multi outdoor unit.
Applicable models: PAC-AH125, 140, 250, and 500M-J
2. System restrictions and use of range
(1) System configuration
Connectable outdoor units PUHY-P250,300,350,400,450,500YGM-A,
PUHY-P*Y(S)HM-A, PUHY-P*Y(S)JM-A,
PUHY-EP*Y(S)HM-A, PUHY-EP*Y(S)JM-A,
PUHY-HP*Y(S)HM-A,
PUHY-RP*Y(S)JM-A,
PQHY-P*Y(S)HM-A,
PURY-P*Y(S)HM-A, PURY-P*Y(S)JM-A,
PURY-EP*Y(S)HM-A, PURY-EP*Y(S)JM-A,
PURY-RP*Y(S)JM-A,
PQRY-P*Y(S)HM-A
*PAC-AH500M-J can NOT be connected to PURY and PQRY.
Refrigerant type R410A
Capacity of connectable AHU units and
indoor units
*Air flow rate is limited to the table shown in 4(1) when AHU is connected with standard indoor units.
(2) Operating conditions
[PUHY and PURY Series]
Operating conditions of indoor, outdoor, air handling units (cooling/heating)
Unit Type Cooling Heating
AHU (Heat exchanger inlet air
temperature)
Outdoor unit refer to the specifications of outdoor unit
*Discharge air temperature would be unstable when the inlet air temperature is more than 15℃.
[PQHY and PQRY Series]
Operating conditions of indoor, inlet water, air handling units (cooling/heating)
Unit Type Cooling Heating
AHU (Heat exchanger inlet air
temperature)
Inlet water temperature 10~45ºC 10~45ºC
*Discharge air temperature would be unstable when the inlet air temperature is more than 15℃.
(3) Refrigerant pipe size, pipe length, and height difference restrictions
Model names Unit capacity Pipe size(Liquid / Gas)
15~24ºCWB -10~15℃DB(Discharge air temp. control)*
15~24ºCWB 5~15℃DB(Discharge air temp. control)*
80~100% of outdoor unit capacity
-10~20℃DB(Suction/return air temp. control)
5~20℃DB(Suction/return air temp. control)
PAC-AH125M-J
PAC-AH140M-J
100, 125, 140 Φ9.52 / Φ15.88
200 Φ9.52 / Φ19.05 PAC-AH250M-J
250 Φ9.52 / Φ22.2
400 Φ12.7/ Φ28.58 PAC-AH500M-J
500 Φ15.88 / Φ28.58
WYN C1-1545A
1/19
Pipe length
Height difference
Refer to the technical data book of the outdoor unit.
Amount of refrigerant
Refer to the technical data book of the outdoor unit.
to be added
3. Product configuration
(1) Series configuration
Several types of controllers to accommodate different AHU capacities are available.
Select the appropriate controller.
Model name PAC-AH125M-J PAC-AH140M-J PAC-AH250M-J PAC-AH500M-J
Cooling
Heating
Reference air
flow rate (m3/h)
Unit capacity
Max. capacity (kW)
Min. capacity (kW)
Max. capacity (kW)
Min. capacity (kW)
11.2 14.0 16.0 22.4 28.0 45.0 56.0
9.0 11.2 14.0 16.0 22.4 36.0 45.0
12.5 16.0 18.0 25.0 31.5 50.0 63.0
10.0 12.5 16.0 18.0 25.0 40.0 50.0
2000 2500 3000 4000 5000 8000 10000
100 125 140 200 250 400 500
* Calculate the capacity of connectable indoor units using the “Unit capacity” in the table above.
The Unit capacity is set at the model name at factory shipment. Change the Unit capacity to the
appropriate value for the selected controller using the switch on the controller board. When it is needed,
refer to the installation manual for how to change the Unit capacity.
* Refer to the technical data book of the outdoor unit about the actual capacity.
(2) Controller components
Name Usage
Controller
Controller board For operation control
Transformer For controller board
Terminal block For power source, for external I/O, for internal and external
communication, for remote controller, and for thermistor
Connector For remote controller and for level input switch
Relay For operation display and for error display
LEV-kit
Thermistor
Electronic linear expan. valve
For detection of suction air temperature, discharge temperature,
liquid pipe temperature, and gas pipe temperature
Clip
For mounting suction air and discharge air temperature
thermistor
Insulation
Tie band
Tube
Installation manual
For insulating liquid pipe and gas pipe thermistor
For fixing liquid pipe and gas pipe thermistor
For fixing wiring
-
WYN C1-1545A
2/19
(3) Major specifications
Power supply 220~240V 50/60Hz
External dimension (mm) 378(420)×328×104(122)
Net weight (kg) 5
External finish(Munsel No.) Galvanaized steel
IP-class IP2X
Remote controller
temperature
setting range
Operation
Cooling
Heating
Auto
Operation by
optional remote
controller
ON/OFF
Operation by
external input*
Setting
temperature by
external input
The figure in ( ) indicates mounting's.
14~30ºC
17~28ºC
17~28ºC
Press ON/OFF button on the remote controller to start/stop the
operation. Following settting can be done by optional remote
controller(PAR-21MAA):
1)Temperature setting
Discharge air temperature setting or Suction air temperature
setting are available by DIP switch setting.
Please refer to “Switch function” in detail.
2)Operation mode setting
Please refer to the operation manual of the remote controller in
detail.
*Remove the attached connector "CNRM" in case the optional
remote controller is used for its operation.
Connect the field-installed external thermostat (ON/OFF) to the
external input (SW1:ON/OFF) to start the operation when the
external thermo is ON, and stop the operation when it is OFF.
*Set the attached connector "CNRM" in case the external input
is used for ON/OFF operation.
Discharge air temperature setting or suction air temperature setting
can be done by analog input (0-10V) accordingly (Analog input
operation).
Setting from remote controller is not available when analog input
setting is used. (Either remote controller setting or analog input
operation is selected.)
Do not operate the system controller when analog input setting is
used. It would cause conflicting operation with analog input operation
and unit would not operate in good working order.
＜Setting＞
Set the DIP switch 8-2 ON when Analog input operation is used.
SW8-2 Analog input
OFF NOT effective (initial setting)
ON Effective
When the discharge air temperature control mode is selected,
lower limit setting of the discharge air temperature in cooling mode is
chosen as below table,
SW3-5 Lower limit setting temperature
OFF
ON
14℃ (Initial setting)
8℃
WYN C1-1545A
3/19
Setting temperature by analog input (0-10V) operation is chosen as
below setting (Type1 or Type2).
SW8-3 Analog input type Restriction
OFF Type1 (Initial setting) Auto mode is available
ON Type2 Auto mode is NOT available
i)Type1 <For temperature control>
Cooling/Heating
-Setting temperature = 2.5×Ain + 5.0 : *Ain=Input Voltage
-Condition
SW3-5=OFF (SW8-3=OFF) SW3-5=ON (SW8-3=OFF)
Setting temperature
℃
28
14
0
3.6 9.2
Input Voltage
Setting temperature
℃
28
8
V
0
1.2
Input Voltage
Suction temp. control is N/A
9.2
V
*When the setting temperature in heating mode is 17℃ or less,
the discharge air temperatutre can be unstable.
ii)Type2 <For capacity control>
Cooling
-Setting temperature = -2.5×Ain + 31 : *Ain=Input Voltage
-Condition
SW3-5=OFF (SW8-3=ON) SW3-5=ON (SW8-3=ON)
Setting temperature
℃
28
Setting temperature
℃
28
14
8
1.2
0
6.8
Input Voltage
V
1.2
0
Input Voltage
Suction temp. control is N/A
9.2
V
Heating
-Setting temperature = 2.5×Ain + 5.0 : *Ain=Input Voltage
-Condition
SW3-5=OFF (SW8-3=ON) SW3-5=ON (SW8-3=ON)
Setting temperature
℃
28
14
3.6 9.2
0
Input Voltage
Setting temperature
℃
28
8
V
1.2
0
Input Voltage
Suction temp. control is N/A
9.2
V
*When the setting temperature in heating mode is 17℃ or less,
the discharge air temperatutre can be unstable.
*Setting temperature is updated when the voltage variation of 0.2V or
more is detected for 1 sec or more.
WYN C1-1545A
4/19
Temperature
control
Contact input Following functions can be controlled from local controller by using
MAC-397IF-E.
-External control (ON/OFF)
-External output (ON/OFF, Error)
-Mode select(Cooling/Heating)
-Setting temperature
Refer to the installation manual of MAC-397IF-E about details.
Interlock
operation with
AHU fan
Temperature
control by
optional remote
controller
Interlock setting between the error stop of AHU fan and the external
error input must be made to close the LEV of AHU
heat exchanger when AHU fan makes an error stop. Refer to
section 5 for details.
Discharge air temperature control or suction/room air temperature
control can be chosen by changing the switch on control board and
by changing the position of attached thermistor.
In controlling the discharge air temperature, the capacity is
controlled so that detection temperature of the thermistor installed in
an outlet of AHU reaches the set temperature by remote controller.
In controlling the suction/room air temperature, the capacity is
controlled so that thermostat becomes OFF if detection temperature
of the thermistor installed in an inlet of AHU or the room reaches the
set temperature by remote controller.
WYN C1-1545A
5/19
Temperature
control
Temperature
control by
optional remote
controller
(i)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 shown with a square in the table below can be changed by
a dip-switch.
Cooling
The range of
“To”
Thermostat
OFF
a) or b) or c)
Thermostat
ON
a) & b) & c)
& d)
Heating
The range of
“To”
Thermostat
OFF
a) or b) or c)
Thermostat
ON
a) & b) & c)
& d)
14〜30℃
a) TH24<To
b) TH24<14℃
c) TH21<To – 2℃ is continued for 10 minutes.
a) TH24 > To +1℃
b) TH24 > 15℃
c) TH21 > To +1℃
d) It passes from thermostat OFF for 3 minutes.
17〜28℃
a) TH24>To
b) TH24>15℃
c) TH21>To + 3℃ is continued for 10 minutes.
a) TH24 < To –1℃
b) TH24 < 14℃
c) TH21 < To –1℃
d) It passes from thermostat OFF for 3 minutes.
(ii)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 shown with a square in the table below can be changed by a
dip-switch.
Cooling
The range of
“To”
Thermostat
OFF
a) or b)
Thermostat
ON
a) & b) & c)
Heating
The range of
“To”
Thermostat
OFF
14〜30℃
a) TH24<20℃
b) TH21<To-0.5℃
a) TH24 > 21℃
b) TH21 > To +0.5℃
c) It passes from thermostat OFF for 3 minutes.
17〜28℃
a) TH24>21℃
b) TH21>To
WYN C1-1545A
6/19
Protection
function
Temperature
control by
external
thermostat
Freezing
prevention
Sensor failure If a short or an open of the thermistor is detected during
Communication
error
External error Error stop (code:4109) is available by the interlock setting between
Other types of
error
Connect the field-installed external thermostat (ON/OFF) to the
external input (ON/OFF) to start the operation when the
external thermo is ON, and stop the operation when it is OFF.
The thermostat will be turned off when the suction air
temperature thermistor reading reaches the preset temperature
on the remote controller. Refer to section 5 for details.
* A remote controller is necessary for the operation mode switching.
After 16-minute or more cooling operation, and when 1ºC 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 10ºC 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.
operation, the error will affect the LEV, and it will be closed.
If the addresses overlap or the transmission line is not
connected properly, the error will affect the LEV, and it will be
closed.
local fan motor error output and external error input. Error stop
(code:4109) is caused when the contact A11 and A12 opened, then
both outdoor unit stops and fan stop its operation.
If the outdoor unit in the system has a problem, it will affect the entire
system, and the compressor will stop.
WYN C1-1545A
7/19
Switch function Thermostat
control
a) Change of discharge or suction air temperature control
Dip switch
SW7-2
OFF Suction / return −
ON Discharge Initial setting
Thermostat control Remarks
b)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 Heating
OFF OFF TH21 TH21 Initial setting
ON OFF TH21-1 TH21+1 −
OFF ON TH21-2 TH21+2 −
ON ON TH21-3 TH21+3 −
Remarks
c)TH24
i) Discharge air temperature control
<Cooling>
Dip switch Thermostat condition of TH24
SW3-10 Thermo-OFF Thermo-ON
OFF 14℃ 15℃ Initial setting
ON 20℃ 21℃ −
Remarks
<Heating>
Dip switch Thermostat condition of
TH24
SW3-8 SW3-9 Thermo-OFF Thermo-ON
OFF OFF 21℃ 20℃ −
ON OFF N/A N/A −
OFF ON 10℃ 9℃ −
ON ON 15℃ 14℃ Initial setting
Remarks
ii)Suction/return air temperature control
<Cooling>
Dip switch Thermostat condition of TH24
SW1-8 Thermo-OFF Thermo-ON
OFF 20℃ 21℃ Initial setting
ON 15℃ 16℃ −
Remarks
<Heating>
N/A
WYN C1-1545A
8/19
d)Dip-switch for function
SW1
SW3
SW8
SW1
In a table shown below, the gray part shows “At delivery”.
i) Discharge air temperature control
Operation by switch No. Function
1 Thermistor< suction
temperature> position
2
Replace of TH21
Cooling: TH21-a
Heating: TH21+a
3
4 NOT available N/A Fix
5 Remote indication
switching
6 NOT available N/A Fix
7 NOT available N/A Fix
8 NOT available N/A Fix
9 Auto reset function Effective Not effective
10 Power ON/OFF Effective Not effective
Function
o.
1 Heat pump
/Cooling only
2 NOT available N/A Fix
3 NOT available N/A Fix
4 Fan in defrosting Fan ON Fan OFF
5 Lower limit of setting
temp. for analog input or
MA remote controller
6 NOT available N/A Fix
7 NOT available N/A Fix
8
Thermostat by TH24 in
heating
9
10 Thermostat by TH24 in
cooling
ON OFF
Remote
controller
2 / 3
OFF/OFF: a=0
ON / OFF: a=1
OFF/ ON: a=2
ON / ON: a=3
Thermostat
ON signal
Operation by switch N
ON OFF
Cooling only Heat pump
8℃ 14℃
Dip switch Thermo3-8 3-9 OFF ON
OFF OFF 21℃ 20℃
ON OFF N/A N/A
OFF ON 10℃ 9℃
ON ON 15℃ 14℃
20℃-OFF
21℃-ON
TH21
Fan output
14℃-OFF
15℃-ON
Function
o.
1 Demand input Pulse Level
2 Analog input Effective Not effective
3 Analog input type Type2 Type1
Operation by switch N
ON OFF
ii) Suction/return air temperature control
Operation by switch No. Function
1 Thermistor< suction
temperature>
position
2
Replace of TH21
Cooling: TH21-a
Heating: TH21+a
3
4 NOT available N/A Fix
5 Remote indication
switching
6 NOT available N/A Fix
7 NOT available N/A Fix
8 Thermostat by
TH24 in cooling
9 Auto reset function Effective Not effective
10 Power ON/OFF Effective Not effective
ON OFF
Remote
controller
2 / 3
OFF/OFF: a=0
ON / OFF: a=1
OFF/ ON: a=2
ON / ON: a=3
Thermostat
ON signal
indication
15℃-OFF
16℃-ON
TH21
Fan output
indication
20℃-OFF
21℃-ON
WYN C1-1545A
9/19
SW3
Operation by switch No. Function
SW8
1 Heat pump
/Cooling only
2 NOT available N/A Fix
3 NOT available N/A Fix
4 Fan in defrosting Fan ON Fan OFF
5 NOT available N/A Fix
6 NOT available N/A Fix
7 NOT available N/A Fix
8 NOT available Fix N/A
9 NOT available Fix N/A
10 NOT available Fix N/A
Demand input Pulse Level
Analog input Effective Not effective
Analog input type Type2 Type1
ON OFF
Cooling only Heat pump
Operation by switch Function
ON OFF
* Default setting (operation mode setting or temperature setting) with an optional remote controller must be
made when an external input is used.
WYN C1-1545A
10/19
4. Requirements on AHU design
(1) Design method of heat exchanger
Model name
Unit capacity
Reference air flow rate in case of
connection without standard
indoor units (m3/h)
Max. air flow rate in case of
connection with standard indoor
units, except cooling only (m3/h)
Common part
Min. volume inside
heat exchanger tube (cm3)
Max. volume inside
heat exchanger tube (cm3)
Max. capacity (kW) 11.2 14.0 16.0 22.4 28.0 45.0 56.0
Min. capacity (kW) 9.0 11.2 14.0 16.0 22.4 36.0 45.0
Standard number of circuits
(Heat exchanger tube size Φ9.52）
Pressure drop of the refrigerant
in heat exchanger
LEV inlet temperature 25ºC
Evaporating temperature 8.5ºC
Cooling
SH 5K
Evaporator outlet
Temperature
Evaporator suction
air temperature
Max. capacity (kW)
Min. capacity (kW)
Condensing temperature =TC
PAC-AH125M-J PAC-AH140M-J PAC-AH250M-J PAC-AH500M-J
100 125 140 200 250 400 500
2000 2500 3000 4000 5000 8000 10000
800 1000 1120 1600 2000 3200 4000
1500 1900 2150 3000 3750 6000 7500
2850 3550 4050 5700 7100 11400 14200
4~5 4~5 5~6 6~10 8~10 16~20 16~20
Max. 0.03MPa
13.5ºC
27ºCDB/19ºCWB
12.5 16.0 18.0 25.0 31.5 50.0 63.0
10.0 12.5 16.0 18.0 25.0 40.0 50.0
Choose TC satisfying a condenser design condition among chart below depending
on unit size. In the case of using a heat recovery, choose TC=48℃ as the suction
temperature of heat exchanger may become 10℃ or more even if outdoor
temperature is 0℃.
Outdoor temp. 0℃DB/-2.9℃WB(Water temp.20℃ in PQHY/PQRY)
55
50
45
)
℃
40
TC(
35
Heating
30
25
2000 3000 4000 5000 6000
Available
Air flow rate (CMH)
P100 800 1200 1600 2000 2400
P125 1000 1500 2000 2500 3000
P140 1120 1680 2240 2800 3360
P200 1600 2400 3200 4000 4800
P250 2000 3000 4000 5000 6000
P400 3200 4800 6400 8000 9600
P500 4000 6000 8000 10000 12000
Unit size
Airflowrate(CMH)
* When air flow rate is less than the above, choose TC=48℃.
WYN C1-1545A
11/19
HEX inlet temperature
Heating
SC 15K
Condensor outlet temperature TC-15
Condensor suction air temperature 0℃DB / -2.9℃WB
Choose HEX inlet temperature from chart below depending on TC.
*Calculate the capacity of connectable AHU units using the “Unit capacity” in the table above.
*Refer to the technical data book of the outdoor unit about the actual capacity.
(2) Heat exchanger manufacturing
Design pressure 4.15 MPa
Evaporator burst pressure
Compressive strength
Contamination control Clean the heat exchanger with detergent to make the allowable level of
The compressive strength of the evaporator and of other pipes must exceed
12.45MPa.
Insufficient withstand pressure may cause the pipes to crack and result in gas
leakage.
contamination per unit length of the heat exchanger tube of the following values
or less on the assumption that the heat exchanger tube size is Φ9.52. Do not
use chlorinated detergent. Do not leave flux.
Allowable level of contamination may cause the compressor not to function
properly. Contamination amount: residual water amount 0.6 mg/m or less,
residual oil amount 0.5 mg/m or less, amount of solid contaminants 1.8 mg/m or
less
(3) Installation conditions of AHU controller
Installation
site
- Avoid locations in direct sunlight.
- Avoid locations exposed to the air out.
- Avoid locations exposed to the elements or water splashes.
- Avoid locations exposed to steam or oil vapor.
- Avoid locations where combustible gas may leak, settle or generated
- Avoid installation near machines emitting high-frequency waves.
- Avoid places where acidic solutions are frequency waves.
- Avoid places where sulfur-based or other sprays are frequently used.
- Avoid places where vibration may occur.
Ambient
temperature
Ambient
Relative humidity of 95% or less (No dew condensation is allowed)
humidity
Installation
angle
80
75
70
65
60
55
50
Hex inlet temperature( ℃)
45
40
25 30 35 40 45 50
TC(℃)
-20~43ºC
Vertical installation
WYN C1-1545A
12/19
(4) Cautions for installing LEV-kit
Connect the wire according to the wire color code to avoid miswiring. For
Installation environment
Installation angle Install the motor above the horizontal.
Pipe size
Caution on brazing LEV can withstand only up to 120ºC. Cool the LEV while brazing.
Wire connection -
(5) Cautions for installing thermistor
Installation site - Install the pipe thermistor properly so that it can accurately measure the pipe
Wire connection - Connect the wire according to the terminal number to avoid miswiring.
(6) Other cautions
- The refrigerant temperature inside the evaporator may become 0ºC. Note that dew condensation on
AHU main body or on the refrigerant pipe may occur.
- Drain the AHU properly.
The temperature of AHU evaporator will drop and dew may condense on the AHU main body, if the
LEV of AHU does not close due to malfunction in a system with one outdoor unit connected to a AHU
controller, and if the AHU stopped and the other AHUs are in operation. Take appropriate measures
against dew condensation to avoid serious damage to the unit.
- When a heater for heating operation is built-in and when both of the heater for heating operation
and the heat exchanger are operated, the operation must be conducted within the inlet temperature
range of the heat exchanger.
- Install an air filter on the heat exchanger.
- Interlock the unit with the fan to prevent the refrigerant system from running when the fan stopped.
- In a system with one outdoor unit connected to a AHU controller, the LEV of AHU will slightly open in
heating operation to prevent the refrigerant from accumulating inside the AHU heat exchanger, and
the temperature of the AHU heat exchanger will slightly rise.
Avoid locations in direct sunlight.
Φ9.52 (Brazing)
Use two(four) LEVs when installing AH250(AH500). Connect two(four) LEVs in
parallel, and connect them to the appropriate refrigerant pipe according to the
unit capacity.
AH500, connect two wires to the same terminal.
- Do not strain the power supply wires.
- Be careful with the plate edge not to damage the wire.
- The wire can withstand only up to 105ºC. Keep the wire away from
high-temperature part.
- Bend the wire into "U" shape to prevent water from running down the wire and
from dripping on the electrical components or the LEV.
temperature. Protect it with the insulation material so that it is not affected by
the temperature at other places.
- Install the liquid thermistor sensor at the evaporator inlet where the lowest
temperature is found, as the thermistor is used to prevent freezing.
- Install the gas pipe thermistor at the junction of the evaporator outlet.
- Install the suction air temperature thermistor at a place where the average
temperature of suction air into the coil can be measured.
- Install the discharge air temperature thermistor at a place where the average
temperature of discharge air off the coil can be measured.
- Do not strain the power supply wires.
- Be careful with the plate edge not to damage the wire.
- The wire can withstand only up to 105ºC. Keep the wire away from
high-temperature part.
- Bend the wire into "U" shape to prevent water from running down the wire and
from dripping on the electrical components or the thermistor.
WYN C1-1545A
13/19
- In a system with one outdoor unit to which some AHU controllers are connected, the
LEV will be temporarily open in heating operation to run the outdoor unit in defrost operation. In this
case, low-temperature refrigerant will run inside the AHU heat exchanger, and the heating capacity
of AHU which is running heating operation using the heater for heating operation will temporarily
drop.
- In controlling the suction/return air temperature, capacity control is affected by the outdoor
temperature. When the outdoor temperature drops, the discharge temperature also drops. Take
proper measures to control the room temperature, to select the outlet position, and to prevent dew
condensation.
- In controlling the discharge air temperature, check the discharge air temperature of the low load
capacity in middle season, because the thermostat may repeat ON/OFF.
The targeted minimum capacity is 6kW. The minimum ΔT, which is the temperature
difference between the inlet air temperature of the heat exchanger and discharge air temperature in
heating mode, is shown as below chart. In cooling mode, ΔT is different depending on the SHF (As
shown below, when SHF is 1, this is the ΔT at heating).
25
20
15
10
5
Minimum of ΔT(K)
0
0 1000 2000 3000 4000 5000 6000
5. Requirements on interface with controller
Item Connection circuit
Operation
■Operation contact specifications
■Use a relay when the electrical wire exceeds 10m.
Air flow rate(CMH)
SW1: Operation command
(field supply)
Minimum applicable load
DC5V, 1mA
X: Relay(field supply)
Minimum applicable load
DC5V, 1mA
SW2: Operation command
(field supply)
WYN C1-1545A
14/19
■Interlock operation with fan error and connection example of field-installed thermostat
Interlock the unit so that the unit stops when an error occurs on the fan (field supply).
Analog input ■Analog input
TBY
B1
B2
Contact input ■Contact input by using MAC-397IF-E
+DC0~10V
- DC0~10V
X: Relay
(field supply)
Minimum applicable load
DC5V, 1mA
SW2: Operation command
(field supply)
Error: Error of fan sections
(field supply)
Thermo: Thermistor
Wiring : AWG22~26
(field supply)
TBY
C1
Error input ■External error input
Remove the short circuit wire(*A) when Error input is used.
C2
C3
C4 C5
TBX
A11
*A(Initial)
A12
Contact A11-A12 condition
-Short(Initial) :Normal
-Open :Error (Code 4109)
Operation
signal
Error signal
If error resets (stop operation) and restart operations are repeatedly performed, the
Compressor may be damaged seriously. Install an error lamp, and contact the service
Receiving signal(RX)
Transmitting signal(TX)
DC5V
GND
DC12V
TBX
Protector(field supply)
A11
A12
L1: Operation display lamp
(field supply)
Display power source:
DC30V 1A, AC100V/200V 1A
L2: Error display lamp
(field supply)
Display power source:
DC30V 1A, AC100V/200V 1A
Wiring : AWG22~26
Wiring : AWG22~26
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Fan signal
Defrost
signal
Electrical
wiring
firm or the dealer when an error occurs. Installation of the remote controller is
recommended so that the error details can be checked.
X: Relay(field supply)
AC200V 1A,
A fan control signal is output. It is usually the ON output at the time of operating, but it is the
OFF output in defrosting.
-Be careful to miscarriage lines because over AC200V is impressed in ON.
-When the dip-switch SW3-4 on the control board is ON, the fan operates in defrosting also. In
this case, be careful of the cold wind of AHU or the freezing of a humidifier.
-When the switch SWE on the control board is turned on, the fan signal is always ON.
X: Relay(field supply)
AC200V 1A,
A defrost signal is output in defrosting. Be careful to miscarriage lines because over AC200V is
impressed in ON.
Transmission
cables
M-NET
Remote
controller
cables
MA Remote
controller
cables
CVVS, MVVS : PVC insulated PVC jacketed shielded control cable
CPEVS : PE insulated PVC jacketed shielded communication cable
CVV : PV insulated PVC sheathed control cable
6. Related cautions
(1) Installation work
- Secure enough service space for replacement of the LEV and the thermistor.
After an AHU controller is installed, address setting and unit capacity setting on the controller board
switch is necessary. Refer to the installation manual for the setting method.
- Refer to the outdoor unit installation manual or the data book for installation of the outdoor unit.
(2) Test run
- Turn on the main power of the unit at least 12 hours before test run to power the crankcase heater.
- Power supply cords of appliances shall not be lighter than design 245 IEC 57 or 227 IEC 57.
- A switch with at least 3mm contact separation in each pole shall be provided by the Air conditioner
installation.
- The diameter of the power supply wire to the AHU controller must be 1.5mm2 or larger.
- Use an earth leakage breaker with a sensitivity of 30 mA 0.1s or less.
- Use a separate wire for AHU’s main circuit from the circuit shown above. Select the appropriate wire or
the protection device on site, according to the AHU specifications.
- Type of cable : Shielding wire (2-core) CVVS or CPEVS or MVVS
- Cable diameter : 1.25mm2
- Type of cable : Sheathed wire 2-core cable(unshielded) CVV
- Cable diameter: 0.3~1.25mm2
(0.75~1.25mm2 : connected with simple remote controller)
* When the cable exceeded 10m, use cables with the same specification as transmission cables.
- Type of cable : Sheathed wire 2-core cable(unshielded) CVV
- Cable diameter: 0.3~1.25mm2
(0.75~1.25mm2 : connected with simple remote controller)
- Max length : 200m
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Insufficient powering time may result in compressor damage.
- As the temperature setting and the operation mode setting are made at initial setting, a remote
controller is necessary. Remove the remote controller after making the initial settings if it is not used.
In case of PAR21MAA, remove the remote controller after turning off the power of the indoor and
outdoor units. In case of PAR-27MEA, remove it after deleting the address of the remote
controller.
(Refer to the installation manual for remote controller for more details.)
(3) Operation control
- Remove the connector inside the AHU controller when a local remote controller is used. When the
connector is connected, the controller will be in the remote operation mode, and the operation by the
local remote controller will be prohibited.
- If the error lamp lights or the error display appears on the remote controller, do not reset an error
by yourself. Contact the service firm or the dealer.
- Refer to the data book for system controller when using the system controller.
(4) Service
- Regular maintenance is required to prolong the life of the units. It is recommended that the
maintenance contract be concluded with a maintenance firm.
7. Warranty
- Specifications of AHU and compatibility with regulations must be confirmed by your company.
- Selection of an appropriate AHU (with appropriate specifications to match those of units connected
to the AHU such as configuration, dimension, life-span, vibration, noise level, or features) must be
made by your company.
- Mitsubishi Electric shall not be liable for any damage to the entire system or the AHU main body
caused by connected AHU with wrong specification or wrong usage of AHU.
- Mitsubishi Electric shall not be liable for any damage to the outdoor units caused by AHU damage.
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External Dimension
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Electrical Wiring Diagram
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