Si30-408 HRV-Related
Appendix 239
7.4.3 Fresh-up Operation by External Input [HRV Unit]
Purposes and
Functions
When the operation is interlocked with the local ventilating fan (such as the one for toilet or
kitchen), the HRV unit performs the over-supply operation to prevent the reverse flow of the
odor.
The flow rate of supply air becomes higher than that of exhaust air.
Example of
Control Wiring
Local wiring
Notes: The connecting wiring between HRV unit and the terminal for local connection can be extended
up to 50 m maximum.
Switch Setting of
HRV Unit
No change is required. (factory setting)
Optional
Accessories
Required
None
Operation of HRV unit
Terminal for
local connection
Capacity of connecting terminal
Fresh-up Short-circuit
No-voltage normally open contact for
micro-current 16 V, 10 mA
Normal Open circuit
X9A
X10A
X11A
J1 J2 F1 F2
P1P2
P1P2
JC
SS1
Connecting line can be extended up to 50 m maximum.
HRV unit
(Terminal for local connection)
Remote controller for HRV unit
(HC0032)
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