If this can not be avoided it is recommended to install either an simple thermostat close to the inlet which switches OFF the VOD or a non-return valve between the contact system and the VOD.
如果这个不能避免(的话)，这里建议在靠近入口处安装一简易恒温器来切断VOD，或在接触设备与VOD之间设置一逆止阀。
If this can not be avoided it is recommended to install either an simple thermostat close to the inlet which switches OFF the VOD or a non-return valve between the contact system and the VOD.
如果这个不能避免(的话)，这里建议在靠近入口处安装一简易恒温器来切断VOD，或在接触设备与VOD之间设置一逆止阀。
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