On boiler cool-down the vent should be opened
a) as soon as the post-purge is completed
b) when all temperatures are at ambient value
c) any time after the NRV is closed
d) just before the unit goes into a vacuum
e) at no time
Answer: D
On boiler cool-down the vent should be opened
a) as soon as the post-purge is completed
b) when all temperatures are at ambient value
c) any time after the NRV is closed
d) just before the unit goes into a vacuum
e) at no time