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  1. Ray9363

    Low Ambiant Operation for Small A/C

    Thanks Dave I just responded to the proposal as follows, "The manufacturer offers both head pressure and defrost control as a low ambient option. I would recommend the head pressure control over the other but it's up to the manufacturer to make it work. If they feel comfortable w/ this...
  2. Ray9363

    Low Ambiant Operation for Small A/C

    Thanks for your responses. The manufacturer has both options, head pressure control and evap defrost control listed for low ambient operations as shown below. Personally, I just cannot understand how the defrost control will help at low ambient temperatures. Evaporator Defrost Control (Low...
  3. Ray9363

    Low Ambiant Operation for Small A/C

    Need advice, I have a requirement to provide cooling to several small communications rooms where cooling is required year around. Our winter design db temp is 25 degrees. I received a proposal that included installing an evaporator defrost control on a 2.5 ton cooling only package unit. No...

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