IOM SYSVRF2 AHU BOX0620 20220209 134828067 20220209 141028052

13
Figure 3-16
Figure 3-17
3.6.3 Temperature Sensor Wiring 3.6.4 Cross section of main power cable
3.6.5 Fan Wiring
The temperature sensors come with two wiring methods,
by dialling DIP switch SW9-2.
Type
1
2
SW9-2 is 0: One or more AHU control
boxes are connected in parallel to
one AHU; one coil is connected to
multiple control boxes; (shielding
faults from slave unit's temperature
sensors T1, T2, T2A, TA and T2B)
(factory default)
SW9-2 is 1: Multiple AHU control
boxes are connected in parallel. In
the event of multiple coils, one coil is
connected to one control box;
(shielding faults from slave unit's
temperature sensor T1, TA)
SW9
ON
1 2 3
SW9
ON
1 2 3
SW9
Type 1: One or more AHU control boxes are connected
in parallel to one AHU, and the T2A, T2 and T2B sensors
of any coil of AHU are connected to the master AHU
control box. The T1 and TA sensor is connected to the
main board of the master AHU control box.
Schematic diagram:
Schematic diagram:
1# slave
AHU
N# slave
AHU(N≤3)
Master AHU
Signal wire (X/Y/E)
Signal wire (X/Y/E)
T1,T2,T2A,T2B,TA
1# AHU
L1
L2
Type 2: Multiple AHU control boxes are connected in
parallel. Each coil is connected to an AHU control box.
The T2A, T2 and T2B sensors of each coil are connected
to the main board of the corresponding AHU control box.
The T1 and TA sensor only needs to be connected to the
master AHU control box.
Master AHU
N# slave AHU(N≤3)
Signal wire (X/Y/E)
T1,T2,T2A,T2B,TA
2# AHU
Factory
controller
T2,T2A,T2B
Please select the main power cable. Refer to Table 3-11
and Table 3-12.
Table 3-11
AHU BOX 2290, 90200Model
Power
Voltage and
Frequency
Phase
AHU Control Box Power
Wire (mm
2
)
Single-phase
220-240V - 50/60Hz
2.0 (<50 m)
Table 3-12
AHU BOX 200360, 360560Model
Power
Voltage and
Frequency
Phase
AHU Control Box Power
Wire (mm
2
)
Single-phase
220-240V - 50/60Hz
4.0 (<50 m)
1. Specific wiring requirements must adhere to
local wiring regulations.
2. Use only copper wires.
3. Be sure to use specified wires for connections
and ensure that no external force is imparted to
terminal connections. If connections are not
firmly secured, overheating or fires may result.
4. The wire size is the minimum value for metal
conduit wiring. If the voltage drops, use a wire
that is one rank thicker in diameter. Make sure
the power-supply voltage does not drop by more
than 10%.
5. Power must be unified supply to all AHU
control boxes in the same system.
6. A breaker for current leakage must be
attached to the power supply. If no ground
leakage breaker is installed, it may cause
electrical shock.
7. Never connect the main power source to a
terminal block of the communication line. If
connected, electrical parts will burn out.
CAUTION
Fan signal:
The AHU control box has two output modes to control fan
speed: an analog signal output LOW/MIDDLE/HIGH and
an output of 0-10V, respectively. The output mode is
selected based on the actual on-site needs of the AHU.
Table 3-13
Fan Signal
Low
Middle
High
LOW/ MIDDLE/HIGH
LOW
MIDDLE
HIGH
0-10V output
#
#
#
#: Refer to 0-10V output control