Fantech SHR11004, Руководство по установке

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The HRV is shipped from the factory on low speed, intermittent operation can be obtained by toggling switch located on outside of cabinet.
The voltage selection for low (reduced) speed of the unit is done via jumpers shown in the illustration below. The default setting 75V.
Setting speed
Low: 75V
(Factory Default) Low: 90V
Configurable speed control for low (reduced) speed
CAUTION
MAKE SURE THE POWER TO THE UNIT IS DISCONNECTED BEFORE MAKING ANY CHANGES