This is about General Purpose Switching Relays, their Function, Wiring, Ratings, and Different Types. These relays can be used to create your own control system, are found in fan center controls, and are individual control components in many older systems.
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Supervision is needed by a licensed HVAC Tech while doing this as Experience and Apprenticeship garners Wisdom and Safety.

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You can enter Amazon through this http://amzn.to/2aenwTq

The above link happens to be the Gauge Set that I use in my refrigerant videos but you can search from there.

Here is a link to the UEI DL389 Multimeter used in the video http://amzn.to/2xAdaJf

Here is the link to the Fieldpiece SDMN6 Dual Pressure Testing Manometer with Pump-http://amzn.to/2jyK5Ka

Here is a link for the Supco Magnet Jumpers http://amzn.to/2gS4h6z

Here is a link to Refrigerant hoses with valves used in the videos http://amzn.to/2aBumVI

Here is the Link for the Yellow Jacket Refrigerant Manifold Gauge Set used in the videos http://amzn.to/2aenwTq

Here is a link to the Digital Refrigerant Scale used in the video
http://amzn.to/2b9oXYl

Here is a link to the Imperial 535-C Kwik Charge Vaporizer for Charging Refrigerant- http://amzn.to/2oge0u9

Here is a link to the thermostat 3/32 screwdriver -- http://amzn.to/2hxt7uK

Here is a link to the C&D core removal tool http://amzn.to/2bFpobQ

Here is a link to the JB 6 CFM Vacuum Pump http://amzn.to/2nqbvo8

Here is a link to the JB Platinum 5 CFM Vacuum Pump with Valve
http://amzn.to/2mGKcSh

Here is a link to 1 gallon of JB Vacuum Pump Oil http://amzn.to/2mGrlXy

Here is a link to the Supco Vacuum Micron Gauge http://amzn.to/2bH98bO

Here is a link to the 1/4" by 1/4" female coupler from Supco - http://amzn.to/2kFrbU9

Here is a link to the Hilmor 4 port Aluminum Manifold Gauge Set-
http://amzn.to/2m4QLik

Here is a link to the Supco core removal tool http://amzn.to/2brEJco

Here is a link the Nitrogen Regulator http://amzn.to/2bXdR5f

Here is a link to the Nitrogen Flow Meter http://amzn.to/2brvoBg

Here is a link to the General Tools digital Psychrometer
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Here is a link to the Amprobe Digital Psychrometer http://amzn.to/2d7cGkW

Here is a link to the Fieldpiece SDP2 Digital Psychrometer- http://amzn.to/2nniMVR

Here is the UEI Digital Manometer used in the videos http://amzn.to/2c1XkiT

Here is the link for the Ratcheting Service Wrench http://amzn.to/2dGV4Nh

Here is a link to the Appion G5 Twin Recovery Pump http://amzn.to/2dGSEyr

Here is a link for RectorSeal Bubble Gas Leak Detector http://amzn.to/2ckWACn

Here is a link to the air acetylene torch setup- http://amzn.to/2aQalsb

Here is a link to the Malco Snap Lock Punch http://amzn.to/2cY53Ag

Here is a link to the Wiss 3 Pack Tin Snips http://amzn.to/2bHWhWO

Here is a link to the Wiss 5 Blade Crimper http://amzn.to/2bwTlsW

Here is a link to the Wiss Hand Seamers http://amzn.to/2dRk83v

Here is the link for the Hitachi Lithium Ion Drill and Flashlight kit http://amzn.to/2dzNgkL

Here is the link for the Irwin Wire Stripper/Cutter/Crimper http://amzn.to/2dGTj2V

Here is the link for the Hilmor 12" folding tool http://amzn.to/2d9VTPR

Here is the link for the Malco 3" Blade Combination Snips http://amzn.to/2dz7Ejc

Thank You,
ACSERVICETECH