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Finding right side up

By Richard Hawkins, MACS contributor

在上周的文章中,一个店主和一个技术员之间发生了一场紧张的对峙.  当店主kok体育安卓版下载技术人员他安装了一个冷凝器不当时,事情就发生了.  冷凝器安装颠倒了,线路连接反了.

This seemed inconceivable to the technician, and it is easy to understand why.  Most condensers have different fittings on the inlet and outlet.  大多数冷凝器的入口和出口的位置不允许线路被错误地连接, even if the fittings do happen to be the same size.  最后,大多数冷凝器的安装支架的设计可以防止机组被倒置安装.  然而,这些特性都不适用于技术人员安装的冷凝器.  He was working on a 1998 Chevrolet C1500

General Motors used this condenser design starting in the 1994 model year.  It is found on 1/2, 3/4吨和1吨雪佛兰和GMC皮卡从1994年到1999年的车型年.  它也似乎已经被使用在一些¾和1吨的模型通过2002年的模型年. 

This unit might even be found in some medium duty trucks.  There were millions of these vehicles produced.  From 2008 through 2019, 我平均每年在技术电话中遇到大约6到8次这个问题. 在那段时间里,我大概总共处理了80到85个涉及这个问题的电话.

Vehicle owners tend to hold on to trucks longer than cars.  As a result, there are still a very large number of these vehicles in use today.  They don’t show up in shops as often as they used to.  然而,仍然有大量的a /C工作正在执行对他们. 

 自从有一辆这样的卡车从装配线上开下来,已经快20年了.  Yet, this issue is still occurring often in 2021. 几周前,我kok体育安卓版下载了三个目前从事空调技术工作的人.  他们三人今年已经遇到这个问题十几次了.

Now it is time to look at how this occurs. 这个过程的第一步是知道当设备正确安装时应该是什么样子.  See picture #1 below.

Picture #1: 此处冷凝器安装位置正确,连接正确. The inlet, which slightly resembles the shape of an S, is at the top.  The outlet, which has a 45°bend in it, is at the bottom. The outlet contains a crimp which holds the orifice tube in place.  The discharge line, running from the compressor and connected to the inlet, is noted by the red arrow.  绿色箭头标明了连接到出口并运行到蒸发器的液体管路.  As one would expect, the discharge line is slightly larger than the liquid line. 

Now we will look at what can cause the problems:  First, the size of both the inlet and outlet fitting is the same.  See picture #2 below.

Picture #2: This engineering drawing shows both fittings as being M20*1.5 (M20 X 1.5) Drawing Courtesy of MACS Member Auto Parts Components.

其次,冷凝器在每个角落由四个橡胶绝缘体固定.  每个角的形状是相同的,并且角适合的绝缘体内部的形状是相同的.  As a result, the unit can easily be installed upside down. See picture #3 below.

Picture #3Notice the shape of the corners of the condenser (circled in red).  The inside of the rubber insulators they fit in have the same shape.  The bottom insulators are on the left. The top ones are on the right.

这是冷凝器倒置安装,线路倒接时的样子, as the technician had done in last week’s article.  See picture #4.

Picture #4: 从进口和出口方向可以看出,冷凝器是颠倒的.  The discharge line, 从压缩机(再次注意到红色箭头)运行连接到出口.  液体线,运行到蒸发器(再次注意到绿色箭头)连接到内let. 

With the discharge line being connected to the outlet, 不冷凝的高压蒸汽从压缩机直接引入 .072英寸的开口在孔管,这是什么导致高压问题.

Last week I mentioned a third issue which could occur with this style condenser, 但由于空间的限制,有必要让你在这方面保持悬念直到下周. kok体育安卓版下载还将介绍在将这些行定位为向后连接时遇到的问题.

如果你喜欢这种高水平的,真实世界的技术内容,当你 Join MACS as a member.

One response to “Finding right side up”

  1. Thomas Lech says:

    在90年代后期,当这些冷凝器出现的时候,kok体育安卓版下载可以看到成百上千的冷凝器在前后颠倒的安装了十年之后.
    车身修理厂因安装不当而臭名昭著,因为首先他们不知道冷凝器是如何操作的,它是做什么的,或者气体流向是什么.

    最重要的是,许多冷凝器来到车身商店,没有安装孔板管,他们不知道你必须安装一个,他们经常安装冷凝器,没有办公室管安装.

    如果是冬天,这取决于国家的哪个地区温度在50度以下你的高侧压力就会非常低在那个温度下,降低低侧压力并不困难 . 不像在炎热的夏天,如果没有办公室的管子,它通常会比较低.

    许多这些车辆将离开美体小铺没有孔管和客户将不知道直到春天或夏天的时间滚动时,他们去使用他们的空调.

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