The invention belongs to the technical field of circulating water, and particularly relates to a full-automatic water replenishing and degassing unit which mainly comprises a water replenishing pump, a negative pressure tank, a
water treatment unit, an
expansion tank and a control cabinet, an inlet of the water replenishing pump is connected with a water distribution
pipe, an outlet water of the water replenishing pump is connected with a pressurizing
pipe, and the pressurizing
pipe is provided with a water replenishing
pressure sensor, a
safety valve and a pressure relief pipe. An inlet of the negative pressure tank is connected with a
water diversion pipe, the
water diversion pipe is provided with a
water diversion electric valve, the top of the negative pressure tank is provided with a second one-way valve, the second one-way valve is connected with an
exhaust valve in series, and the negative pressure tank is further provided with a
water level gauge and a negative pressure meter. The
system has the beneficial effects that the
system has the functions of full-automatic unattended variable-frequency constant-pressure water replenishing,
overpressure pressure relief,
expansion tank pressure stabilization, small-flow water replenishing shutdown energy saving, circulating degassing, no-water shutdown alarm,
water recovery and the like, and is high in integration level, small in occupied area, low in investment, economical, worry-saving, efficient and good in use effect.