Hussmann Purity User manual

CO2 Transcritical
Installation &
Operation Manual
P/N 2H17721001_B
August 2018
IMPORTANT
Keep in store for
future reference!
CO2Transcritical
Systems
MANUAL- CO2 TRANSCITICAL IO

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P/N 2H17721001_B
BEFORE YOU BEGIN
Read these instructions completely and carefully.
PERSONAL PROTECTION EQUIPMENT (PPE)
Personal Protection Equipment (PPE) is required whenever servicing this equipment. Always
wear safety glasses, gloves, protective boots or shoes, long pants, and a long-sleeve shirt when
handling glass.
Hussmann reserves the right to change or revise specications and product design in connec-
tion with any feature of our products. Such changes do not entitle the buyer to corresponding
changes, improvements, additions or replacements for equipment previously sold or shipped.

CO2 Transcritical
P/N 2H17721001_B iii
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
SAFETY ........................... II
DISCLAIMER ...................... II
TABLE OF CONTENTS ............. III
REVISION HISTORY ............... IV
ANSI DEFINITIONS ................IV
INSTALLATION
SYSTEM OVERVIEW .............. 1-1
COMPRESSORS ................... 1-2
SYSTEM LUBRICANTS ............ 1-2
FACTORY PIPING ................. 1-2
GAS COOLER ..................... 1-3
CONTROL PANEL ................. 1-3
CONTROL VOLTAGE .............. 1-3
REFRIGERANT ................... 1-3
SHIP LOOSE PARTS ............... 1-4
SHIPPING DAMAGE ............... 1-4
EQUIPMENT ROOM ............... 1-4
LOCATION AND LEVELING ....... 1-5
COMPONENT PIPING & LINE SIZING
RACK PIPING OVERVIEW.......... 2-1
REFRIGERATION LINE RUNS ..... 2-1
FIELD WIRING ................... 3-1
OPTIONAL ACCESSORIES ......... 3-1
PIPING ........................... 3-1
ACCESSORIES CONT. .............. 3-2
CHARGING ....................... 4-1
LEAK DETECTION ................ 4-1
PURITY
PURITY CO2TRANS-CRITICAL .... 5-1
HEAT RECLAIM .................. 5-2
DEFROST ......................... 5-2
OIL MANAGEMENT ............... 5-3
COMPRESSORS ................... 5-4
OIL REGULATORS ................ 5-4
CRANKCASE HEATERS ........... 5-4
TABLE OF CONTENTS
IMPORTANT
KEEP IN STORE FOR FUTURE REFERENCE
Quality that sets industry standards!
12999 St. Charles Rock Road • Bridgeton, MO 63044-2483
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www.hussmann.com
© 2018 Hussmann Corporation

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P/N 2H17721001_B
REVISION HISTORY
ORIGINAL ISSUE — August 2015
* * * * * * * * * * * * * * * * * * * * * * * * * *
ANSI Z535.5 DEFINITIONS
• DANGER – Indicate[s] a hazardous
situation which, if not avoided, will
result in death or serious injury.
• WARNING –Indicate[s] a hazardous
situation which, if not avoided, could
result in death or serious injury.
• CAUTION –Indicate[s] a hazardous
situation which, if not avoided, could
result in minor or moderate injury.
• NOTICE – Not related to personal injury –
Indicates[s] situations, which if not avoided,
could result in damage to equipment.
This warning does not mean that Hussmann products
will cause cancer or reproductive harm, or is in
violation of any product-safety standards or
requirements. As clarified by the California State
government, Proposition 65 can be considered more of
a‘right to know’ law than a pure product safetylaw.
When used as designed, Hussmann believes that our
products are notharmful. We provide the Proposition
65 warning to stay in compliance with California State
law. It is your responsibility to provide accurate
Proposition 65 warning labels to your customers when
necessary. For more information on Proposition 65,
please visit the California State government website.
August 31, 2018

CO2 Transcritical
P/N 2H17721001_B 1-1
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
INSTALLATION
SYSTEM OVERVIEW
This manual covers Trans-critical CO2
systems manufactured by LMP Systems for
Hussmann Corp. These systems can be used
in large or small format supermarkets using
commercial refrigeration equipment with
CO2refrigerant. This manual should be used
by installers and maintenance personnel
when installing or servicing these Hussmann
PURITY Trans-critical CO2systems.
All PURITY Trans-critical CO2systems are
UL Listed and conform to ANSI/ UL 1995 *
CSA C22.2 No.236-11
Equipment must be installed in accordance
with all local codes, state codes, fire codes
and the National Electrical Code.
Trans-critical CO2 systems use carbon
dioxide as a refrigerant. Carbon dioxide
is non-flammable, odorless, colorless gas
that can displace oxygen in the atmosphere
resulting in asphyxiation. If any of the below
initial symptoms are experienced evacuate
the area and seek open space.
Never disable leak detection devices, ventila-
tion systems or pressure relief devices during
system charging or servicing.
Trans-critical CO2 refrigeration systems oper-
ate under high pressure. Excessive pressure
can result in the rupture of components resulting
in physical injury. DO NOT tamper with or
remove pressure relief devices. DO NOT install
additional isolation valves which could trap
carbon dioxide in tubing or other components
without providing proper pressure relief
device.

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P/N 2H17721001_B
COMPRESSORS
The compressors used in these systems are
Bitzer reciprocating, Copeland reciprocating
and/or Copeland Scrolls and are sized to
provide optimal system function at all times
during the standard operation of the unit.
SYSTEM LUBRICANTS
The Hussmann PURITY trans-critical com-
pressors use a Polyol Ester (POE) lubricant.
Specific viscosities are required by the com-
pressor manufacturers. See the chart below
for acceptable lubricants.
NOTE: Adding any lubricant additives in the
field during install or during service will void
the Hussmann and compressor warranty.
FACTORY PIPING:
The systems will come with:
a. Suction, and Liquid Headers and optional Gas
Defrost Headers with individual circuits specific
for refrigeration lineups as provided by the
customer. They can also be designed to accom-
modate a loop system where a single liquid
and suction lines are “looped” in the store, and
individual drops are piped to each lineup. At
Hussmann’s discretion, these two designs may
be mixed on the same system depending on the
requirements.
b. Oil Management System – The oil man-
agement system is designed to provide proper
oil distribution and return to the compressors
during normal operation. Proper line sizing
is very important to ensure proper oil return
to the compressors. Variance from the rec-
ommended line sizes may void the Hussmann
warranty.
c. Liquid Reservoir (Flash Tank) w/ Relief
Valves – Sized to hold the entire refrigerant
charge this component insure that the liquid
lines are supplied with 100% liquid CO2.
d. Relief Valves – These valves are supplied
by Hussmann for field installation and must be
installed in accordance with the procedures in
this manual along with adherence to all local
and national codes, fire codes and authorities
having jurisdiction.
e. Suction Filters – Suction Filters are used
prior to each compressor suction header to
insure that all solid contaminants are removed
from the refrigerant stream prior to the com-
pressors.
f. Liquid Drier – Liquid dryers are installed
in the liquid line and are sized based on the
refrigeration load for that system. It is recom-
mended that the cores used be a minimum of
50% molecular sieves. This will ensure proper
moisture and acid removal. It is also recom-
mended that the filter cores be replaced every
time the system is opened for any period of
time for any reason. At the time of shipment
two sets of cores are shipped with the unit, one
set is to be installed during system install and
the other installed after 7 days of run time.
Compressor Accepted Lubricant
Copeland Reciprocating EMKARATE RL68HB
Copeland Scroll EMKARATE RL68HB
Bitzer Reciprocating EMKARATE RL68HB
SYSTEM COMPONENTS

CO2 Transcritical
P/N 2H17721001_B 1-3
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
GAS COOLER
The Gas Cooler is piped directly after the MT
Compressors. The Gas Cooler removes sensi-
ble heat from the CO2gas when the system is
in trans-critical mode. When the outside tem-
perature allows the system to function in sub-
critical mode, the gas cooler behaves similar
to a standard condenser, where both latent
heat and sensible heat are removed. There
are several different manufacturers each with
specific requirements, the shipped equipment
will have specific information enclosed. When
situations exist (high ambient temperatures
and low relative humidity) – an adiabatic gas
cooler may be used. This type of gas cooler
utilizes water sprayed in the airstream to drop
the condensing temperature to near wet bulb
temperature. This allows the system to run
more efficiently at higher ambient temperatures.
CONTROL PANEL
The Control Power is fully factory wired with
a. Pre-wired Distribution Power Block
b. Individual Integral (combined circuit breaker
and contactor) or Component Circuit Breakers
and Contactors
c. Color Coded wiring
d. All electrical components (ie relays, switch-
es) as required.
CONTROL VOLTAGE
208 volts/1 phase/ 60 hertz — Refer to wiring
diagram for connection type.
REFRIGERANT
Carbon Dioxide (CO2) is the only refrigerant
required with the Hussmann Purity trans-critical
CO2system. The following properties apply:
Table 1. Physical Properties of Carbon Dioxide
Molecular Weight 44.01
Boiling Point (at 1 atm) (°F) -109.1
Triple Point (at 75.2 psia) 69.8
Critical Temperatue (°F) 87.9
Specific Gravity Gas (at 1 atm) 1.53
OSHA (TLV (ppm)-TWA (%)) 5000 - 0.5
Table 2. Thermodynamic Properties of Carbon Dioxide
Property @-20°F @+20°F
Saturation Pressure (psig) 200.2 407.2
Liquid Density, lb./cu. Ft. 66.9 60.3
Vapor Density, lb./cu. Ft. 2.40 4.94
Heat of Vaporization, BTU/lb. 129.6 107.5
Table 3. Grades of Carbon Dioxide
Grade CO2Purity
Industrial Grade 99.5%
Bone Dry Grade 99.8%
Anaerobic Grade 99.9%
Coleman (Instrument) Grade 99.99%
Research Grade 99.999%
Ultra-Pure Grade 99.9999%
Though many grades of CO2are available,
Hussmann recommends using CO2with a
purity equal to or greater than Bone Dry
Carbon Dioxide. The use of this grade
ensures proper operation of the equipment
and is of a purity high enough to prevent
accumulation of non-condensable gases in
the system. Mixing of higher purity grades
of CO2is acceptable. Lower grades of CO2,
though less expensive, are not recommend-
ed for use in Hussmann PURITY systems.
These contain higher levels of contaminants
and water, and may decrease system perfor-
mance. Higher levels of moisture may react
with the CO2and form carboxylic acid which
may degrade component integrity. It is rec-
ommended, depending on your location and
availability of CO2, that enough refrigerant
be kept on site to fill the unit charge.

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SHIP LOOSE PARTS
All required ship loose parts will accompany
the system delivery including, but not limited
to:
a. Liquid Drier Cores
b. Suction Filter Cores
c. Vibration Isolation Pads
d. Temperature and Pressure Transducers
and Probes (as required)
e. All required accessories as defined by the
customer
SHIPPING DAMAGE
All equipment should be thoroughly exam-
ined for shipping damage before and while
unloading. This equipment has been care-
fully inspected at our factory and the carrier
has assumed responsibility for safe arrival. If
damaged, either apparent or concealed, claim
must be made with the carrier.
Apparent Loss or Damage
If there is an obvious loss or damage, it must
be noted on the freight bill or express receipt
and signed by the carrier’s agent, otherwise,
carrier may refuse claim. The carrier will
supply the necessary claim forms.
Concealed Loss or Damage
When loss or damage is not apparent until
after equipment is uncrated, a claim for con-
cealed damage is made. Upon discovering
damage, make request in writing to carrier for
inspection within 15 days and retain all pack-
ing. The carrier will supply inspection report
and required claim forms.
EQUIPMENT ROOM REQUIREMENTS
The equipment room floor must solidly
support the compressor unit as a live load.
Ground level installation seldom presents
problems, but a mezzanine installation must
be carefully engineered.
Follow ANSI/ASHRAE 15 for ventilation
requirements. Ventilation should normally be
between 65 and 100 cfm per compressor unit
horsepower (check local codes). The air inlet
should be sized for a maximum of 500 fpm
velocity. The ventilation fans should cycle by
thermostatic control.
All equipment room ventilation equipment
must be field supplied. Check local codes for
variances.
Proper ventilation provides airflow across the
compressors. Duct work may be necessary.
Provide Carbon Dioxide Leak Detection sys-
tem for the Equipment Room as required by
codes.
Provide a floor drain for disposal of conden-
sate that may form on the compressor unit or
header defrost assembly.
Equipment must be located in the equip-
ment room to provide enough working space
for service personnel, and to meet electrical
codes.
Consult National Electric Code, National
Fire Protection Agency Handbook partic-
ularly “Installation of Switch Boards” and
“Working Space Requirements”. Refer to
local codes for each installation.

CO2 Transcritical
P/N 2H17721001_B 1-5
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
MINIMUM ALLOWABLE DISTANCES IN
EQUIPMENT ROOM
It is recommended that a minimum access of
3 feet be maintained on all sides of the rack
for serviceability. The exception is the side
of the control panel where a 4-ft minimum is
required.
Observe the minimum and maximum distanc-
es as described below for setting the system in
relation to other equipment.
LOCATION AND LEVELING
• Each CO2System must be located in the
machine room so that it is accessible from
all sides. A minimum of 36 inches clearance
is recommended to provide easy access to
equipment.
• Vibration isolation pads are supplied with
each rack. The entire weight of the rack must
rest on these pads (see Table 1-1). The pads
should be located as shown in Figure. Cross-
level the compressor unit so all compressors
are level with each other.
Often machine rooms have uneven floors.
To insure both proper leveling and vibration
isolation in these instances, perform the fol-
lowing:
1. Lift the Trans-critical Custom System in
accordance with procedures detailed.
2. Place 15 gauge 3” x 3” galvanized steel
shims to compensate for uneven floors.
(Shims must be field supplied).
3. Place vibration isolation pads on top of
shims.
3 Ft Clearance
3 Ft Clearance
3 Ft
4 Ft Purity Rack
Control
Panel
# of compressors
per pack Reciprocating or Scroll
2 Compressors 4 Each
3 Compressors 4 Each
4 Compressors 6 Each
5 Compressors 6 Each
6 Compressors 6 Each
7 Compressors 8 Each
8 Compressors 8 Each
9 Compressors 8 Each
10 Compressors 10 Each
Vibration Pad Quantities
3 in. x 3 in. x 2 in.
Vibration Pads

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NOTES FROM INSTALLING CONTRACTOR: