Refrigerants
What do you do before you put in new refrigerant
Purge the system
Flamesensor
Detects if a flame is present during ignition
Condenser fan
To blow outdoor air on to the condenser coils to cool down the refrigerant
Explain refrigeration cycle
Starts from compressor as high temp high pressure liquid goes through the condenser coils as the condenser fan pulls in outside air it cools the coils down which cools the refrigerant. The refrigerant goes through the txv it drops the pressure which drops the temp and then goes through and exits as a low temp low pressure vapor and goes through the evap and repeats
Thermostat screen is blank what is the cause
dead batteries or no low voltage power
What are A2L refrigerants
Low global warning options and are mildly flammable
Circut board
Acts like the "brain" of the furnace.
Condenser relay
acts as a electrical switch to control the power to the cooling fan also can prevent system from overheating
What refrigerant group is low toxic and low flamability
A1
airflow is weak from the vents whats the cause?
Dirty air filters
Lifespan of R-34
No experation but with typical system leaks between 3-12 years
Flame rollout switch
To detect if flames are escaping the burning compartment
Conderser motor
Powers the fan unit for the condenser
When using dry nitrogen from a cylinder, what is of most importance for safety?
Pressure regulator
Outdoor fan runs but compressor wont start whats the cause?
Bad capacitor
Whats the 3 R's of refrigeration
Recycle, reclaim and recycle
Blower motor
to blow or circulate conditioned air through out the house
Compressor
Act like the heart of the system and also acts as the way to start the refrigerant system
What is the required recovery level for a high-pressure appliance containing less than 200 lbs of R-22?
0 inches
The furnace lights and runs for 10 seconds then turns off whats the cause?
Dirty flame sensor or bad Flame sensor
What is a refrigerant blend
Mix of two or more refrigerants
Secondary heat exchanger
captures additional heat from flue gasses that would otherwise be lost also in 90% high furnace
Contactor
acts as a high volt electrical switch and controls power to the compressor and fan motor.
What is ozone depletion caused from
Caused by releasing chlorine or bromine based refrigerants in the atmosphere (CFC's and HCFC's)
Blower motor shuts off randomly with no error codes on the circut board whats the cause
The module is overheating from high static pressure