One. Maintain the opportunity suggests the crucial part to manostat and carbon brush do every 3 months to stop machine examination to maintain. 2. Maintain whether does brush rocker of methodological examination carbon become loose, whether is carbon brush same and same plane, linear on, the contact is good, appear a kind of any states need to change in time, otherwise, the normal movement that can affect manostat reachs service life. If discover carbon brush has worn away fast, coil of examination pillar booster is clean, whether bright hurts bit of; load current to whether pass big.