ASHRAE Journal - November 2021 - 28

ROUNDTABLE
Applying Safety
Standards for
Flammable Refrigerants
Refrigerant safety standards and resulting building codes have been very restrictive
in the use of flammable refrigerants for HVAC&R products. But as societal demands
to control climate change are forcing HVAC designers to consider new lower global
warming potential (GWP) refrigerants that are flammable, stakeholders have been
working to develop the understanding and practice on how to apply these refrigerants.
After more than 10 years, product safety standards and ASHRAE application
safety standards are in their final stages of being updated to allow the use of flammable
refrigerants.
ASHRAE Journal conducted a roundtable discussion
with several industry experts who have been working to
update standards related to handling flammable refrigerants
(see next page for contributors).
Moderator Steve Kujak: We've been using nonflammable
refrigerants for 70, 80 years. What are the major
new practices incorporating and handling flammables
in the standards?
Rusty Tharp: Many of the same practices we use for
the A1s will also apply to flammable A2L, A2 and A3
refrigerants. For example, with A1, these refrigerants
are under pressure, so you've got to be careful when
you're handling them. You've got to keep cylinders
upright during transportation, you have to secure the
cylinders properly in storage and secure them properly
in transportation. A lot of those same rules we use for
current refrigerants still apply with A2Ls. Then, while
28
ASHRAE JOURNAL ashrae.o rg N O V E M B E R 2021
some of the codes and standards are being modified, we
do expect that, for A2L refrigerants, much of the storage
and transportation requirements are going to be similar.
Craig Grider: The biggest change in practices for
refrigerants I've been a part of is the development and
then utilization of new safety standards for appliances
and equipment using flammable refrigerants. I want
to start off by pointing out that the development of UL
60335-2-40 [Standard for Household And Similar Electrical
Appliances-Safety-Part 2-40: Particular Requirements for
Electrical Heat Pumps, Air-Conditioners and Dehumidifiers] was
a monumental task for the HVAC industry because the
breadth and scope covers a wide range of HVAC products.
UL 60335-2-40 has combined under one standard
now, products from prior standards such as UL 1995
[Heating and Cooling Equipment], UL 484 [Standard for Room
Air Conditioners] and UL 474 [Standard for Dehumidifiers].

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ASHRAE Journal - November 2021

Table of Contents for the Digital Edition of ASHRAE Journal - November 2021

Contents
ASHRAE Journal - November 2021 - Intro
ASHRAE Journal - November 2021 - Cover1
ASHRAE Journal - November 2021 - Cover2
ASHRAE Journal - November 2021 - 1
ASHRAE Journal - November 2021 - Contents
ASHRAE Journal - November 2021 - 3
ASHRAE Journal - November 2021 - 4
ASHRAE Journal - November 2021 - 5
ASHRAE Journal - November 2021 - 6
ASHRAE Journal - November 2021 - 7
ASHRAE Journal - November 2021 - 8
ASHRAE Journal - November 2021 - 9
ASHRAE Journal - November 2021 - 10
ASHRAE Journal - November 2021 - 11
ASHRAE Journal - November 2021 - 12
ASHRAE Journal - November 2021 - 13
ASHRAE Journal - November 2021 - 14
ASHRAE Journal - November 2021 - 15
ASHRAE Journal - November 2021 - 16
ASHRAE Journal - November 2021 - 17
ASHRAE Journal - November 2021 - 18
ASHRAE Journal - November 2021 - 19
ASHRAE Journal - November 2021 - 20
ASHRAE Journal - November 2021 - 21
ASHRAE Journal - November 2021 - 22
ASHRAE Journal - November 2021 - 23
ASHRAE Journal - November 2021 - 24
ASHRAE Journal - November 2021 - 25
ASHRAE Journal - November 2021 - 26
ASHRAE Journal - November 2021 - 27
ASHRAE Journal - November 2021 - 28
ASHRAE Journal - November 2021 - 29
ASHRAE Journal - November 2021 - 30
ASHRAE Journal - November 2021 - 31
ASHRAE Journal - November 2021 - 32
ASHRAE Journal - November 2021 - 33
ASHRAE Journal - November 2021 - 34
ASHRAE Journal - November 2021 - 35
ASHRAE Journal - November 2021 - 36
ASHRAE Journal - November 2021 - 37
ASHRAE Journal - November 2021 - 38
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ASHRAE Journal - November 2021 - Cover3
ASHRAE Journal - November 2021 - Cover4
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