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
Water must be circulated through a chiller during refrigerant evacuation to avoid _________.
Freezing
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
The maximum test pressure for leak testing a low-pressure centrifugal chiller is?
10 psig
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
A process stub is a ?
straight piece of tubing that is entered using a piercing access valve
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
recovered refrigerant maybe used in ?
Only the equipment it was recovered from or equipment from the same owner
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)