Heat Pumps and Electric Heat
Complete this HVAC situation: When wiring a heat pump control circuit an orange wire is commonly used for the O terminal. It controls the
reversing valve coil
Respond to this HVAC clue: thermostat differential is temperature
difference
tubing cut with a cutting tool is reamed to
removes burrs
if the area of a is 1200 square feet and requires 800 CFM, how many CFM will area B require if area B is 300 square feet.
200
when filling out the service invoice during a routine preventative maintenance call, the worker should.
record volts and amps
record pressures and temperatures
Complete this HVAC statement: An electric furnace that has 10 kW of heat strip will usually have blank sequence steps.
2
the main thermostat body includes
the bi metal element
activating mechanisms
internal and external wiring
Tubing that has been cut with a hacksaw must be
filed square
Give the number of CFM per ton of refrigeration are considered good practice for evaporators of air conditioning.
400
A customer has a leak and a 300 ton centrifugal system, refuses to repair the leak, and only requests that you charge the unit. On the service invoice, which of the following needs to be recorded.
the pressures, temperatures, volts, and amps
the amount of refrigerant added in the customer's instructions about not repairing the leak
the customer's name and signature
When the emergency heat is energized
the compressor and outdoor fan motor are de- energized
a current relay is easily identified in a schematic drawing because.
contacts and coil are in series
The oxygen cylinder used with oxyacetylene heating equipment contains oxygen stored at a pressure of about.
2000 psig
The terms IC and IX refer to
tin plate
Complete this HVAC situation: when talking to customers
be polite
be punctual
The purpose of emergency heat is to
provide heat if the heat pump fails
act as a backup if the house heat loss is greater than the heat pump capacity
the result expected of an open start winding in a motor is that the.
overload would open
When brazing with oxy Acetylene equipment the Acetylene regulator should never be adjusted to produce any pressure higher than.
15 psig
On an insufficient heat call of two rooms, piping or ducts are found running through a cold crawl space under the two rooms. The corrective action would be to.
insulate the piping or ducts
most customers prefer a service technician who
maintains personal hygiene
is well groomed
is neatly attired
The efficiency of an electric furnace is usually
100%
when replacing a start capacitor, a capacitor with a value equal to or within what percent of the original value may be used.
10
When lighting a soldering furnace you should
light a piece of paper. place it in the furnace, and then turn on the gas
How do you measure ductwork airflow.
CFM
A workers first service call for the day was under a house to service an oil furnace. Before proceeding to the next call a thermostat installation the worker should.
change into a clean uniform