Light in weight
A low boiling point
A fairly low condensing pressure
A non-toxic nature
A non-corrosive action on metals
keep discharge through the coil at the lowest available suction pressure
increase the efficiency of the system
separate refrigerant vapor from the noncondensable gases to be purged
lower the operating temperature of the purger
keep the system cooling while being purged
the compressor and motor are mounted within the same housing
field servicing is not possible
it does not have or require shaft sealing
the compressor is driven by an electric motor
the motor is cooled by the low pressure, low temperature vapor being drawn into the housing
In the receiver
In the condenser
In the evaporator
In the expansion valve
In the compressor suction
The heat exchanger
The high side of the system
The low side of the system
The expansion valve
refrigerant leak detector to detect leaks
soap test to detect leaks
O2 to pressurize the system
halide torch flame to detect leaks
N2 to pressurize the system
automatic expansion valve
low pressure float valve
thermostatic expansion valve
high pressure float valve
hand operated expansion valve
an oil separator
a stop valve
a low pressure safety cut off
a direct acting suction pressure regulator
a solenoid valve
an evaporator pressure regulator
a high pressure safety cut out
Air conditioning systems
They are operated by the force exerted on a flexible vane immersed in the liquid flowing in the line.
They can only be used to regulate liquid flow.
They are used as lockout switches when flow is insufficient.
They can be used to close flow indicator circuits.
They are used on chilled water.
Actuators are required to provide damper movement.
Depending on the damper position the quantity of air passing through the duct varies widely.
The dampers decrease the resistance to the passage of air.
Multispeed blowers cannot be used in combination with evaporator dampers.
When the damper is closed the quantity of air passing over the evaporator coils is at a maximum.
Scroll, rotary, and positive displacement.
Axial, centrifugal, and positive displacement.
Rotary, reciprocating, and lobe.
Centrifugal, dynamic, and positive displacement.
Reciprocating, rotary, and centrifugal.
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