MCAC-KTSM-2009-03
Wiring
Heat Recovery Ventilation
17
13. Wiring
Warning:
Before obtaining access to terminal device, all power supply circuits must be interrupted.
13.1 Precautions When Laying Power Supply Wiring
A circuit breaker of shutting down power supply to the entire system be installed.
A single switch can be used to supply power to units on the same system. However, branch switches and
circuit breakers must be selected carefully.
Fit the power supply wiring of each unit with a switch and fuse as shown in the drawing.
Install a wiring interrupter or ground-fault circuit interrupter for the power wiring.
Make sure the ground resistance is no greater than 100
Ω
.
This value can be as high as 500
Ω
when using a grounding fault circuit interrupter since the protective
ground resistance can be applied.
Be sure to give the electric grounding (earth) connection.
Do not let the grounding wire should come in contact with gas pipes, water pipes, lighting rods, or telephone
ground wires.
●
Gas pipes: gas leaks can cause explosions and fire.
Water pipes: can not be grounded if hard vinyl pipes are used.
●
Telephone grounded and lightning rods: The ground potential when struck by lightning gets extremely
high.
Do no turn on the power supply (wiring interrupter or ground-fault circuit interrupter) until all other work is
done.
Tightening torque for the terminal screws.
Use the correct screwdriver for lighting the terminal screws. If the blade of screwdriver is too small, the head
of the screw might be damaged, and the will not be properly tightened.
If the terminal screws are tightened too hard, screws might be damaged.
Refer to the table below for the tightening torque of the terminal screws.
Tightening torque (N•m)
Terminal base of remote controller/ Signal transmission wire (X2M)
0.79-0.97
Terminal base of power supply (XIM)
1.18-1.44
Grounding terminal (M4)
1.44-1.94
●
After wiring, please confirm all connections are correct, and then power to the unit.
●
Pay attention to the power supply wire of three-phase model; confirm the phase sequence of which is
correct.
13.2 Power Specification
Model
Power supply
Power supply wire dimension
HRV- Phase
Frequency/voltage
Input current
main switch
/fuse(A)
Wire’s quantity
Code wire
cross-section (mm
2
)
200, 300, 400,
500, 800, 1000
Single
phase
220V
～
50Hz 15/15
3 (Yellow/green wire is
grounding wire)
2.5
1500, 2000
Three
phases
380V 3N
～
50Hz 15/15
5 (Yellow/green wire is
grounding wire)
2.5
