HVAC 097 why does an AC freeze

Course Lessons

1. 1- HVAC 001 Where are you going? Goals or we cant get there
2. 2- HVAC 002 making the best of this course, Study, Retain, Reinforce, to reach success!
3. 3- HVAC 003 1st Law of Thermodynamics
4. 4- HVAC 004 2nd law of thermodynamics simplified for HVAC
5. 5- HVAC 005 refrigeration intro, Moving heat! basic component.
6. 6- HVAC 005 refrigeration, MOVING HEAT!
7. 7- HVAC 006 Compressor, Vapor pump introduction
8. 8- HVAC 007 Discharge line, Hot Gas Line Intro
9. 9- HVAC 008 Condensing coil intro
10. 10- HVAC 009 Liquid Line and Liquid line filter drier intro
11. 11- HVAC 010 Metering device, Expansion device introduction
12. 12- HVAC 011 Evaporator Coil introduction
13. 13- HVAC 012 Suction, Gas line introduction
14. 14- HVAC 013 Refregeration cycle introduction as one
15. 15- HVAC 014 Moving heat like a sponge
16. 16- HVAC 015 Temperature, temperatures
17. 17- HVAC 016 BTU British Thermal Unit a measure of heat
18. 18- HVAC 017 Latent vs Sensible heat
19. 19- HVAC 018 Evaporator evaporating boiling is a cooling effect
20. 20- HVAC 019 Condensing is a heating effect
21. 21- HVAC 020 Adding Evap and Cond to refrigeration cycle
22. 22- HVAC 021 Pressure PSIG vs PSIA Atmospherc pressure
23. 23- HVAC 021.1 PSIA example
24. 24- HVAC 022 A pressure and boiling water at room temperature.
25. 25- HVAC 022 B alcohol Evaporation and boiling
26. 26- HVAC 023 Refrigerant introduction
27. 27- HVAC 024 Saturation the most important yet misunderstood hvac termanology
28. 28- HVAC 025 Temperature Pressure and Saturation connected, NO SET PRESSURES!
29. 29- HVAC 026 PSIG to Saturation part 1 the suction pressure and suction saturated on the unit
30. 30- HVAC 026 PSIG to Saturation part 2 with the refrigeration cycle
31. 31- HVAC 026 PSIG to Saturation part 3 head pressure on the unit
32. 32- HVAC 026 PSIG to Saturation part 4 liquid saturation on the ref cycle
33. 33- HVAC 027 reading a Pressure Temperature Chart, saturated temperature chart
34. 34- HVAC 028 app for temperature and pressure digital PT chart saturated pressure chart
35. 35- HVAC 029 Temperature Pressure demonstration
36. 36- HVAC 030 Superheat the foundation
37. 37- HVAC031 superheat on a unit
38. 38- HVAC 032 Desuperheat
39. 39- HVAC 033 Subcooling foundation
40. 40- HVAC 034 Subcooling on a unit
41. 41- HVAC 035 The complete refrigeration cycle
42. 42- HVAC 036 Split System refrigeration Cycle
43. 43- HVAC 037 A Refrigeration cycle on a refrigerator
44. 44- HVAC 037 B refrigeration cycle on a water cooler
45. 45- HVAC 038 package unit refrigeration cycle
46. 46- HVAC 039 A Refrigeration cycle window AC
47. 47- HVAC 039 B refrigeration cycle with sight glass
48. 48- HVAC 039 C refrigeration Cycle visible clear tubing
49. 49- HVAC 040 manifold gauge set introduction
50. 50- HVAC 041 Hoses and low loss fittings
51. 51- HVAC 042 A Gauges and hoses on and off the simplest way without contamination.
52. 52- HVAC 042B part 2 bleeding across the manifold method without contamination
53. 53- HVAC 042C Part 3 Manual low loss valves, applying and removing gauges
54. 54- HVAC 042D Part 4 Purging the hoses between different refrigerants
55. 55- HVAC 043 replacing a valve core
56. 56- HVAC 044 o-rings, caps and locking caps
57. 57- HVAC 045 service valve introduction
58. 58- PSI, do you know it? pop quiz, bad audio warning
59. 59- HVAC 046 Conduction
60. 60- HVAC 047 Convection
61. 61- HVAC 048 Forced Convection
62. 62- HVAC 049 Radiant Heat radiation
63. 63- HVAC 050 introduction to Comfort, the whole house system and motivation to be the best!
64. 64- HVAC 051 Introduction to Humidity and dehumidiication
65. 65- HVAC 052 Measuring Wet Bulb, Dry Bulb and Humidity
66. 66- HVAC 054 Fixed Orfice metering device must match the compressor
67. 67- HVAC 055 Superheat will move with a fixed orifice.
68. 68- HVAC 056 Target Superheat for a fixed metering device
69. 69- HVAC 057 fixed orifice Target Subcooling
70. 70- HVAC 058 intro Fixed orfice refregerant charge diagnostics
71. 71- HVAC 059 Example fixed metering device with Superheat and Subcooling vs Target SH SC
72. 72- HVAC 060 Introduction to the TXV TEV
73. 73- HVAC 061 TXV TEV part 2 with Target Subcooling
74. 74- HVAC 062 TXV TEV Target superheat vs Superheat, intro level
75. 75- HVAC 063 TXV TEV with superheat and subcooling
76. 76- HVAC 064 Superheat and Subcooling vs pressure or line feel
77. 77- HVAC 065 example Superheat and Subcooling with digital gauges
78. 78- HVAC 066 Superheat notes
79. 79- HVAC 067 Subcooling notes
80. 80- HVAC 068 Suction Line a little deeper view
81. 81- HVAC 069 suction line accumulator
82. 82- HVAC 070 Suction line Filter Drier
83. 83- HVAC 071 Receprocating compressor hermetic sealed
84. 84- HVAC 071 1 bonus Refrigerator Reciprocating Compressor hermetically sealed
85. 85- HVAC 072 Semi Hermetic reciprocating compressor intro
86. 86- HVAC 072 B Semi hermetic reciprocating compressor opened up
87. 87- HVAC 073 Rotary Compressor introduction hermetically sealed
88. 88- HVAC 074 A Scroll Compresor introduction hermetic sealed
89. 89- HVAC 074 B Scroll compressor cut open
90. 90- HVAC 074 C the scroll set only and some unknowns
91. 91- HVAC 075 crankcase heater, intro to refrigerant migration
92. 92- HVAC 076 Pressure Switch Refrigerant
93. 93- HVAC 077 Refrigerant Muffler discharge / hot gas line
94. 94- HVAC 078 Air Cooled condensing coils, micro channel, tube and fin, spine fin
95. 95- HVAC 079 Water cooled condenser introduction
96. 96- HVAC 080 Liquid Line
97. 97- HVAC 081 Liquid line filter drier
98. 98- HVAC 082 Liquid line Receiver, King Valve
99. 99- HVAC 083 The 3 position service valve
100. 100- HVAC 084 sight glass
101. 101- HVAC 085 Pump Down
102. 102- HVAC 086 A Solenoid Valve part 1 internal workings
103. 103- HVAC 086 B solenoid valve part 2 overview and basic applications
104. 104- HVAC 087 A. Connections part 1 Brazing, introductory only
105. 105- HVAC 087 B. Connections part 2 soft solder introduction
106. 106- HVAC 087 C. Connections part 3 Flare
107. 107- HVAC 087 D connections part 4 Pressed fittings
108. 108- HVAC 087 E connections part 5 mechanical fittings pre-charged line sets
109. 109- HVAC 087 F Connections part 6 Quick Connect Push To Connect Fittings
110. 110- HVAC 088 capillary tubes metering device
111. 111- HVAC 089 fixed orifice piston closer look inside
112. 112- HVAC 090 TXV a deeper view of the Thermostatic Expansion Valve TEX TXV
113. 113- HVAC 091 EXV EEV Electronic Expansion Valve introduction
114. 114- HVAC 092 Automatic Expansion Valve AXV AEV and evaporator pressure should be
115. 115- HVAC 093 Flash gas revisited with a deeper view
116. 116- HVAC 094 Evaporator a deeper look, comfort cooling, environmental
117. 117- HVAC 095 Evap coils for freezers and coolers
118. 118- HVAC 096 Evaporator coil with fluid instead of air
119. 119- HVAC 097 why does an AC freeze
120. 120- HVAC 097 B scenario, AC Freezes AFTER servicing
121. 121- HVAC 098 ΔT Delta T Delta Temperature
122. 122- HVAC 099 TD Temperature differential 2 different substances
123. 123- HVAC 100 A compression Ratio part 1
124. 124- HVAC100 B Compression Ratio part 2
125. 125- HVAC 101 Big review Refrigeration cycle with all the details
126. 126- HVAC 102 Scenario Low Evaporator Airflow effects on the refrigeration cycle
127. 127- HVAC 103 Scenario Dirty Condensing coil
128. 128- HVAC 104 Scenario: Overcharged system Fixed vs TXV TEV
129. 129- HVAC 105 Scenario: Overfeeding Metering device
130. 130- HVAC 106 Scenario Restriction and non-condensable
131. 131- HVAC 107 Scenario: Low Ambient
132. 132- HVAC 108 Scenario Low on charge
133. 133- HVAC 109 Example, charging a low system
134. 134- HVAC 110 Introduction to Measure quick and wireless probes.
135. 135- HVAC 110 part 2 Measure quick and probes, walk in cooler
136. 136- HVAC 110 Part 3 Refrigeration Examples, Charging, probes and measure quick
137. 137- HVAC 111 Refrigerant CFC 12 and HFC 134A
138. 138- HVAC 112 HCFC 22 and HFC 410A
139. 139- HVAC 112 part 2 oil
140. 140- HVAC 113 Disposable refrigerant tanks
141. 141- HVAC 114 Refrigerant blends, glide, bubble, dew, zeotrope, azeotrope
142. 142- HVAC 115 Mixed refrigerants, factory vs field
143. 143- HVAC 116 Charging with Auto low loss fittings on 3 port manifold
144. 144- HVAC 117 Charging with Manual Low loss fittings and 3 port manifold
145. 145- HVAC 118 Charging with 4 port Manifold manual valve low loss fittings
146. 146- HVAC 119 Charging with Wireless Probes
147. 147- HVAC 120 Heating a tank for low ambient charging
148. 148- HVAC 121 Refrigerant weight , volume, temperature, pressure. scales and charging cylindar
149. 149- HVAC 123 Recovery Tanks part 1
150. 150- HVAC 122 Refrigerant Recovery, why we need to
151. 151- HVAC 124 Recovery Tank part 2 do not overfill
152. 152- HVAC 124 Reusing refrigerant
153. 153- HVAC 125 Recovery Overcharged Unit with gauges
154. 154- HVAC 127 Recover empty tank, intro recovery machine
155. 155- HVAC 128 Recovery most used but slowest
156. 156- HVAC 129 Faster Recovery
157. 157- HVAC 130 Next level fast recovery
158. 158- HVAC 131 Recovering from a pumped down unit.
159. 159- HVAC 132 liquid recovery method "high speed"
160. 160- HVAC 133 Push Pull method
161. 161- HVAC 134 Vacuum p1 atmospheric pressure revisited
162. 162- HVAC 135 Vacuum P2 Atmospheric pressure
163. 163- HVAC 136 Vacuum P3 Mechanical vacuum on a barrel
164. 164- HVAC 137 Vacuum P4 visualize, measuring vacuum
165. 165- HVAC 138 Vacuum P5 dehydration
166. 166- HVAC 139 Vacuum P6 Vacuum Pump VS Recovery machine
167. 167- HVAC 140 Vacuum P7 Vacuum Pump oil
168. 168- HVAC 141 Vacuum P8 Changing the vacuum pump oil
169. 169- HVAC 142 Vacuum P9 Inside the vacuum pump
170. 170- HVAC 144 Vacuum p11 mic pump information
171. 171- Brands of Vacuum pumps HVACR
172. 172- HVAC 145 Vacuum p12 Removing restrictions for SPEED
173. 173- HVAC 146 Vacuum P13 example 1 Fast Vacuum dual 1/2" hoses
174. 174- HVAC 147 Vacuum p14 Example 2 single hose setup
175. 175- HVAC148 Vacuum p15 example 3 The 4 port manifold gauge
176. 176- HVAC 149 Vacuum p16 Example 4 Standard manifold
177. 177- HVAC 150 Vacuum p17 Example 5 Triple Evacuation
178. 178- HVAC 151 Vacuum p18 nitrogen flow with vacuum together
179. 179- HVAC 152 Vacuum p19 Review for vacuum
180. 180- HVAC 153 Nitrogen Pressure test with Analogue gauges
181. 181- HVAC 154 Nitrogen Test temperature compensation, digital gauges & app
182. 182- HVAC 155 Nitrogen test with MQ and Probes
183. 183- HVAC 156 Nitrogen test with trace gas
184. 184- HVAC 158 low on charge, LEAK!
185. 185- HVAC 157 Leak Detectors
186. 186- HVAC 159 Why Evaporator coils leak
187. 187- HVAC 159 Why evaporator coils leak (Fixed)
188. 188- HVAC 160 evaporator coil isolation test
189. 189- HVAC161 Condensing unit leak search Tips
190. 190- HVAC 162 refrigerant lineset Leaks
191. 191- HVAC 163 Leak Dye, stop leak, and additives
192. 192- HVAC 164 EPA Study methods and testing tips
193. 193- HVAC 165 Evaporative cooling
194. 194- HVAC 166 Evaporative cooler how it works inside
195. 195- HVAC 167 ICE latent heat of fusion
196. 196- HVAC 168 states of water in BTU on a graph.
197. 197- HVAC 169 Ice for cooling