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, and 250M-H
2. System restrictions and use of range
(1) System configuration
Connectable outdoor units PUHY-P250,300,350,400,450,500YGM-A
Refrigerant type R410A
Capacity of connectable AHU units 80~100% of outdoor unit capacity
Connectable indoor units Do not group the AHU with the standard indoor unit.
(2) Operating conditions
Operating conditions of indoor, outdoor, air handling units (cooling/heating)
Unit Type Cooling Heating
AHU (Heat exchanger inlet air temperature) 15~24ºCWB
Outdoor unit -5~43ºCDB -20~15.5ºCWB
(3) Refrigerant pipe size, pipe length, and height difference restrictions
Model names Unit capacity Pipe size(Liquid / Gas)
-10~15℃DB
PAC-AH125M-H
PAC-AH140M-H
100, 125, 140 Φ9.52 / Φ15.88
200 Φ9.52 / Φ19.05 PAC-AH250M-H
250 Φ9.52 / Φ22.2
WYN C0-8940
1/16
Pipe length
Height difference
(a) No further branching in the pipes is possible after the header branch.
(b) Cooling operation is performed when the outdoor temp. is 0
ºC or lower：
H’=4m or less
(c) Equivalent pipes length(m)：Actual pipe length + A×number of bent.
Table A
Outdoor unit model A Outdoor unit model A
P250 0.42 P400 0.50
P300 0.42 P450 0.50
P350 0.47 P500 0.50
WYN C0-8940
2/16
Amount of
refrigerant to be
added
(a) Original charge of refrigerant and the maximum total charge.
At factory shipment, refrigerant are charged in the outdoor unit as shown at
following Table. When extending the piping in the field, additional charge of
refrigerant is needed. Yet, the maximum total charge in the air conditioner
system should not be exceeded. The maximum additional charge varies on
models, shown as the following Table.
Ta b l e
PU(H)Y-YGM P250,300,350 P400 P450,500
Original charge A(kg) 9.5 13.0 22.0
Maximum total
charge
Maximum
additional
charge
B(kg) 40.0 40.0 67.0
C(kg) 30.5 27.0 45.0
(b) Calculation of the additional charge for the air conditioner system in the field.
The additional charge (F kg) is calculated as follows. F should be round up to
0.1 digital, like 10.52→10.6kg.Yet, if F results bigger than C, the maximum
additional charge is C.
F(kg)=(0.2×Ld)+ (0.12×Le)+ (0.06×Lf)+ (0.024×Lg)+D
Where Ld(m) : Length of liquid pipe sized Φ15.88
Le(m) : Length of liquid pipe sized Φ12.7
Lf(m) : Length of liquid pipe sized Φ9.52
Lg(m) : Length of liquid pipe sized Φ6.35
D(kg) : Additional charge of refrigerant required by the total capacity
of AHU units in the refrigerant system.
Total capacity of AHU
units connected
D(kg) 1.5 2.0 2.5 3.0
~161 161~330 331~480 481~500
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-H PAC-AH140M-H PAC-AH250M-H
Cooling
Heating
Reference air
flow rate (m
Unit capacity
Max. capacity (kW)
Min. capacity (kW)
Max. capacity (kW)
Min. capacity (kW)
3
/h)
11.2 14.0 16.0 22.4 28.0
9.0 11.2 14.0 16.0 22.4
12.5 16.0 18.0 25.0 31.5
10.0 12.5 16.0 18.0 25.0
2500 3000 4000 5000
2000
100 125 140 200 250
* 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.
WYN C0-8940
3/16
(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
Connector For remote controller and for level input switch
Relay For operation display and for error display
LEV-kit
Thermistor
Clip
Insulation
Tie band
Tube
Installation manual
(3) Major specifications
Power supply 208~240V 50/60Hz
External dimension (mm) 382(430)×326×117(132)
Net weight (kg) 7
External finish(Munsel No.) 5Y 8/1
IP-class IP24
Remote controller
temperature setting
range
Operation
Temperature
control
Cooling
Heating
Operation by
optional remote
controller
Operation by
external input*
Interlock
operation with
AHU fan
Temperature
control by
optional remote
controller
communication, for remote controller, and for thermistor
Electronic linear expan. valve
For detection of suction air temperature, discharge temperature,
liquid pipe temperature, and gas pipe temperature
For mounting suction air and discharge air temperature
thermistor
For insulating liquid pipe and gas pipe thermistor
For fixing liquid pipe and gas pipe thermistor
For fixing wiring
-
The figure in ( ) indicates mounting's.
14~30ºC
17~28ºC
Press ON/OFF button on the remote controller to start/stop the
operation.
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.
Interlock setting between the error stop of AHU fan and the
external input ON/OFF 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 C0-8940
4/16
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 C0-8940
5/16
Temperature
control by
external
thermostat
Protection function
Freezing
prevention
Sensor failure If a short or an open of the thermistor is detected during
Communication
error
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 10
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.
If the outdoor unit in the system has a problem, it will affect the
entire system, and the compressor will stop.
ºC or more of the
WYN C0-8940
6/16
Switch function Thermostat
control
Change of discharge or suction air temperature control
a)
Dip switch
SW7-2
OFF Suction / return
ON Discharge Initial setting
Therm ostat 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
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 －
Detection temperature
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 Thermo-OFF Thermo-ON
OFF 10℃ 9
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>
Dip switch Thermostat condition of TH24
SW3-8 Thermo-OFF Thermo-ON
OFF 10℃ 9
ON 15℃ 14℃ Initial setting
℃
Remarks
－
WYN C0-8940
7/16
d)Dip-switch for function
In a table shown below, the gray part shows “At delivery”.
i) Discharge air temperature control
SW1
Operation by switch No. Function
1 Thermistor< suction
temper ature> position
Replace of TH21
2
Cooling: TH21-a
Heating: T H21+a
3
4 NOT available N/A Fix
5 Remote indic ation
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
SW3
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 T hermostat by TH24
in heating
9 NOT available Fix N/A
10 Thermostat by TH24
ii) S
uction/return air temperature control
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 No. Function
ON OFF
Cooling only Heat pump
15℃-OFF
14℃-ON
20℃-OFF
21℃-ON
TH21
Fan output
10℃-OFF
9℃-ON
14℃-OFF
15℃-ON
SW1
Operation by switch No. Function
ON OFF
1 Thermistor< suction
temper ature>
position
Replace of TH21
2
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
SW3
1 Heat pump
/Cooling only
2 NOT available N/A Fix
3 NOT available N/A Fix
4 Fan in defr osting 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
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
Operation by switch No. Function
ON OFF
Cooling only Heat pump
TH21
Fan output
indication
20℃-OFF
21℃-ON
* Default setting (operation mode setting or temperature setting) with an optional remote controller must be
made when an external input is used.
WYN C0-8940
8/16
4. Requirements on AHU design
(1) Design method of heat exchanger
Model name
Unit capacity
Reference air flow rate (m3/h)
Min. volume inside
heat exchanger tube (cm
Common part
Max. volume inside
heat exchanger tube (cm
Max. capacity (kW) 11.2 14.0 16.0 22.4 28.0
Min. capacity (kW) 9.0 11.2 14.0 16.0 22.4
Standard number of paths
(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
3
)
3
)
PAC-AH125M-H PAC-AH140M-H PAC-AH250M-H
100 125 140 200 250
2000 2500 3000 4000 5000
1500 1900 2150 3000 3750
2850 3550 4050 5700 7100
4~5 4~5 5~6 6~10 8~10
Max. 0.03MPa
13.5ºC
27ºCDB/19ºCWB
12.5 16.0 18.0 25.0 31.5
10.0 12.5 16.0 18.0 25.0
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℃.
55
Outdoor temperture 0℃DB/-2.9℃WB
50
45
)
℃
40
Heating
TC(
35
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
Unit siz e
Air flow rate (CMH)
WYN C0-8940
9/16
HEX inlet temperature
Heating
SC 15K
Condensor outlet temperature TC-15
Condensor suction air temperature 0℃DB / -2.9℃WB
Coose HEX inlet temperature from chart below depending on TC.
Calculate the capacity of connectable AHU units using the “Unit capacity” in the table above.
(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
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 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
Φ9.52. Do not
WYN C0-8940
10/16
(4) Cautions for installing LEV-kit
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 - Connect the wire according to the wire color code to avoid miswiring. For
(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 0
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.
- 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
Avoid locations in direct sunlight.
Φ9.52 (Brazing)
Use two LEVs when installing AH250. Connect two LEVs in parallel, and
connect them to the appropriate refrigerant pipe according to the unit capacity.
AH250, 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 evaporator 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.
ºC. Note that dew condensation on
WYN C0-8940
11/16
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.
■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).
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)
X: Relay
(field supply)
Minimum applicable load
DC5V, 1mA
SW2: Operation command
(field supply)
Error: Error of fan sections
(field supply)
Thermo: Thermistor
(field supply)
WYN C0-8940
12/16
Operation signal
Error signal
Fan signal
Defrost signal
Electrical wiring
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
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
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.
AC200V is impressed in ON.
Be careful to miscarriage lines because over
- 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 1.5mm
- 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.
Transmission
cables
M-NET Remote
controller
cables
MA Remote
controller
cables
- Type of cable : Shielding wire (2-core) CVVS or CPEVS or MVVS
- Cable diameter : 1.25mm
- Type of cable : Sheathed wire 2-core cable(unshielded) CVV
- Cable diameter: 0.3~1.25mm
* 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: 0.3~1.25mm
- Max length : 200m
2
2
(0.75~1.25mm
2
(0.75~1.25mm
2
: connected with simple remote controller)
2
: connected with simple remote controller)
2
or larger.
WYN C0-8940
13/16
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.
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.
(5) PAC-AH M-G type
- PAC-AH M-H type can be changed to PAC-AH M-G type by setting the following switch. New
functions, thermostat control etc, can not be available by PAC-AH M-G type except for the fan signal.
SW1
1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10
ON ON
OFF OFF
SW4
1 23 4 5 1234 123
ON ON ON
OFF OFF OFF
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.
SW7
SW 3
SW8
WYN C0-8940
14/16
External Dimension
PAC-AH125/140/250M-H
R3.5
R7.5
55
55
55
55
WYN C0-8940
15/16
Electrical Wiring Diagram
WYN C0-8940
16/16
Loading...