core
what is gwp
global warming potential
are leak repairs required on small appliances
no but repairs should be done whenever possible
when a open drive compressor has not run in months what is the number one issue
leak at shaft seal
before November 15 1993 very high pressure appliances had to be recovered to
0" Hg
a rupture disc will blow at what psig
15psig
odp stands for?
ozone depletion potential
what is a active recovery
recovery machine is used
what is hcfc
hydro chloro floro carbon
after November 15 1993 very high pressure appliances had to be recovered to
0" Hg
what type of systems use a purge unit
units the operate below atmospheric pressure (vacuum)(type 3, chillers)
how many chlorine molecules does it take to destroy 100,000 ozone molecules
1
passive recovery is done when
unit compressor is functioning
when the annual leak rate exceeds 10% how long do you have to repair leak
30 days
annual leak rate % for ipr is
30%
what is a A1 classification
non flammable non toxic
hfc refrigerants have a odp of?
0
after November 15 1993 recovery pumps must?
recover 90% of the refrigerant when comp is working and 80% when comp is not functioning
if 50% of the comfort cooling is used for ipr what is the unit consider
industrial process refrigeration
when recovering from a low pressure chiller where must you set the high pressure cut to not rupture
10 psig
on a centrifugal chiller where does the purge unit take its suction from
top of the condenser
the sale of cfc and hcfc refrigerants have been restricted to certified techs since
November 14 1994
what is the definition of the epa for type 1 appliances
product manufactured, charged and hermetically sealed from factory containing 5 Lbs or less of refrigerant
what is ashrae standard 15
requires that sensors be installed in areas where refrigerant can collect
low pressure chillers using R-123 operate in what pressure
below atmospheric pressure
when is it OK to vent refrigerants to the atmosphere
when they are natural (co2 butane ammonia)