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SVTPerformance's Chain of Restaurants
Road Side Pub
Hey HVAC Guys! Need Help...
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<blockquote data-quote="Thump_rrr" data-source="post: 15476949" data-attributes="member: 36572"><p>Those are your low and high pressure safety switches.</p><p>If you look closely you will notice that one has a red reset button on the top.</p><p>this is the high pressure switch.</p><p>The other is the low pressure switch.</p><p>They are typically wired in series with a time delay relay and then go on to the contactor (compressor motor starting relay).</p><p></p><p>The purpose of the pressure safety switches is to stop the compressor if a high or low pressure event occurs to protect the compressor.</p><p></p><p>If the condenser fan ( fan on top of outdoor unit) fails the pressure will rise opening the high pressure switch. this is to prevent the compressor from overheating. Since the high pressure switch is manually resetable it would definitely get your attention.</p><p></p><p>The low pressure switch would open if there is a lack of refrigerant, if the indoor blower fan wasn't working or the indoor air filter was blocked causing a lack of airflow. It would restart automatically if the problem went away.</p><p></p><p>In your case these safety items have been bypassed most likely by a cheap ass owner who didn't want to spend the money to fix his equipment properly.</p><p></p><p>The equipment most likely has other issues and from the photos looks to be quite old.</p></blockquote><p></p>
[QUOTE="Thump_rrr, post: 15476949, member: 36572"] Those are your low and high pressure safety switches. If you look closely you will notice that one has a red reset button on the top. this is the high pressure switch. The other is the low pressure switch. They are typically wired in series with a time delay relay and then go on to the contactor (compressor motor starting relay). The purpose of the pressure safety switches is to stop the compressor if a high or low pressure event occurs to protect the compressor. If the condenser fan ( fan on top of outdoor unit) fails the pressure will rise opening the high pressure switch. this is to prevent the compressor from overheating. Since the high pressure switch is manually resetable it would definitely get your attention. The low pressure switch would open if there is a lack of refrigerant, if the indoor blower fan wasn't working or the indoor air filter was blocked causing a lack of airflow. It would restart automatically if the problem went away. In your case these safety items have been bypassed most likely by a cheap ass owner who didn't want to spend the money to fix his equipment properly. The equipment most likely has other issues and from the photos looks to be quite old. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Road Side Pub
Hey HVAC Guys! Need Help...
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