1 | Page
hvacr gas heating esco Questions and
Correct Answers/ Latest Update /
Already Graded
using an ohmmeter, there is 120 VAC between high speed and
ground wires, this indicates
Ans: open
if temperature rise is too high...
Ans: increase fan speed
how many of the 3 OSHA conditions defining confined spaces must
be met
Ans: all 3
what causes the temperature limit safety switch to shut off the burner
Ans: fan motor failure
,2 | Page
flashback indicates
Ans: the gas is flowing slower than the speed at which burn is occurring
what type of connector is used to control noise in ductwork
Ans: vibration eliminators
if the main burner lights and after a minute the blower fan comes on
but the burner flames waver in one corner...
Ans: there is faulty blower housing
a burner orifice...
Ans: meters gas to the burner
when lockout/tagout is used
Ans: there should be 1 key kept by the electrician
, 3 | Page
the gas pressure is usually
Ans: 3.5
a spark igniter operates at
Ans: 7,500 vac
a good thermocouple produces
Ans: 30 millivolts
what must be present for combustion
Ans: air, fuel and ignition source
the innerds of a type b vent is made of
Ans: aluminium
the outsides of a type b vent is made of
hvacr gas heating esco Questions and
Correct Answers/ Latest Update /
Already Graded
using an ohmmeter, there is 120 VAC between high speed and
ground wires, this indicates
Ans: open
if temperature rise is too high...
Ans: increase fan speed
how many of the 3 OSHA conditions defining confined spaces must
be met
Ans: all 3
what causes the temperature limit safety switch to shut off the burner
Ans: fan motor failure
,2 | Page
flashback indicates
Ans: the gas is flowing slower than the speed at which burn is occurring
what type of connector is used to control noise in ductwork
Ans: vibration eliminators
if the main burner lights and after a minute the blower fan comes on
but the burner flames waver in one corner...
Ans: there is faulty blower housing
a burner orifice...
Ans: meters gas to the burner
when lockout/tagout is used
Ans: there should be 1 key kept by the electrician
, 3 | Page
the gas pressure is usually
Ans: 3.5
a spark igniter operates at
Ans: 7,500 vac
a good thermocouple produces
Ans: 30 millivolts
what must be present for combustion
Ans: air, fuel and ignition source
the innerds of a type b vent is made of
Ans: aluminium
the outsides of a type b vent is made of
