Hussmann Proto-Aire EZ User manual

®
Æ
Proto-Aire EZ
Installation and
Operation Manual
P/N 3090249_E
October 2020
MANUAL- Proto-Aire EZ - IO
Le manuel en français est
disponible via le code QR

Environmental Concerns
Hussmann recommends responsible handling of refrige
-
rants that contain Chlorine, Fluorine and Carbon (CFCs)
and those that contain Hydrogen, Chlorine, Fluorine, and
Carbon (HCFCs). Only certied technicians may handle
these refrigerants. All technicians must be aware and
follow the requirements set forth by the Federal Clean Air
Act (Section 608) for any service procedure being perfor
-
med on this equipment that involves refrigerant. Additio
-
nally, some states have other requirements that must be
adhered to for responsible management of refrigerants.
Contractors shall strictly adhere to specifications
provided by the Engineer of Record (EOR), as
well as US Environmental Protection Agency reg-
ulations, OSHA regulations, and all other federal,
state and local codes. This work should only be
done by qualified, licensed contractors. There are
numerous hazards, not limited to, but including:
burns due to high temperatures, high pressures,
toxic substances, electrical arcs and shocks,
very heavy equipment with specific lift points and
structural constraints, food and product damage or
contamination, public safety, noise, and possible
environmental damage. Never leave operating
compressors unattended during the manual soft-
start process. Always power rocker switches off
when unattended.
PERSONAL PROTECTION EQUIPMENT (PPE)
Only qualified personnel should install and service
this equipment. Personal Protection Equipment
(PPE) is required whenever servicing this equipment.
Wear safety glasses, gloves, protective boots
or shoes, long pants, and a long-sleeve shirt as
required when working with this equipment. Ob-
serve all precautions on tags, stickers, labels and
literature attached to this equipment.
The precautions and use of the procedures described
herein are intended to use the product correctly and
safely. Comply with the precautions described below to
protect you and others from possible injuries. Relative to
their potential danger, the relevant matters are divided
into four parts as dened by ANSI Z535.5
ANSI Z535.5 DEFINITIONS
• DANGER – Indicate[s] a hazardous situa-
tion 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.
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
BEFORE YOU BEGIN
Read the safety information completely and carefully.

— LOCK OUT / TAG OUT —
To avoid serious injury or death from electrical
shock, always disconnect the electrical power at
the main disconnect when servicing or replacing
any electrical component. This includes, but is
not limited to, such items as controllers, electrical
panels, condensers, lights, fans, and heaters.
This manual was written in accordance with
originally perscribed equipment that is subject
to change. Hussmann reserves the right to
change all or part of the equipment for future
stores such as, but not limited to, controllers,
valves and electrical specifications. It is the
installers responsibility to reference the refriger-
ation drawings supplied for each installation, as
directed by the Engineer of Record.
Proper Field Wiring and Grounding Required!
Failure to follow code could result in death or se-
rious injury. All field wiring MUST be performed
by qualified personnel. Improperly installed and
grounded field wiring poses FIRE and ELECTRO-
CUTION hazards. To avoid these hazards, you
MUST follow requirements for field wiring instal-
lation and grounding as described in NEC and
your local/state electrical codes.
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 safety law. When used as designed,
Hussmann believes that our products are not
harmful. 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
This equipment is prohibited from use in California
with any refrigerants on the “List of Prohibited
Substances” for that specific end-use, per Cal-
ifornia Code of Regulations, title 17, section
95374.
Use in other locations is limited to refrigerants
permitted by country, state, or local laws and is
the responsibility of the installer/end-user to ensure
only permitted refrigerants are used.
This disclosure statement has been reviewed and
approved by Hussmann and Hussmann attests,
under penalty of perjury, that these statements
are true and accurate.

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TABLE OF CONTENTS
INSTALLATION .............................................................................................................................................. 5
Overview.......................................................................................................................................................... 5
Shipping Damage ............................................................................................................................................ 5
Apparent Loss or Damage............................................................................................................................... 5
Concealed Loss or Damage ............................................................................................................................. 5
On Site Damage Control.................................................................................................................................. 5
Proto-Aire EZ Unit Nomenclature ................................................................................................................ 6
Moving the Unit ............................................................................................................................................. 7
Physical Drawings and Dimensions (Submittal Documents)............................................................................ 8
REFRIGERATION PIPING ........................................................................................................................ 12
Overview........................................................................................................................................................ 12
Refrigeration Line Piping............................................................................................................................... 12
Return Gas Superheat.................................................................................................................................... 12
Suction Line................................................................................................................................................... 12
Liquid Line.................................................................................................................................................... 13
Refrigeration Cycle ........................................................................................................................................ 13
Oil Cycle ........................................................................................................................................................ 14
ELECTRICAL................................................................................................................................................. 14
Field Wiring................................................................................................................................................... 14
Maximum & Minimum Field Wire Size ................................................................................................... 14
Sizing Wire and Overcurrent Protectors................................................................................................... 14
For 208-230/3/60 Compressor Units with Single Power Feed ................................................................... 14
For 208-230/3/60 Compressor Units with Dual Power Feed..................................................................... 15
For 208-230/1/60 Compressor Units with Single Power Feed .................................................................. 15
For 208-230/1/60 Compressor Units with Dual Power Feed .................................................................... 15
For 460/3/60 Compressor Units with Single Power Feed.......................................................................... 15
For 460/3/60 Compressor Units with Dual Power Feed ........................................................................... 15
Temperature Sensors & Defrost Termination Sensors & Thermostats...................................................... 16
120V GFCI Circuit Operation ................................................................................................................ 16
LED Lighting Operation (if applied) ...................................................................................................... 16
Electronic Oil Level Control .......................................................................................................................... 16
Generic Enclosure Layout ............................................................................................................................. 17
STARTUP
Startup........................................................................................................................................................... 18
Charging the Refrigeration Side..................................................................................................................... 18
Procedure – Triple Evacuation ....................................................................................................................... 19
Pre-charge Check List.................................................................................................................................... 19
Refrigerant Charge ........................................................................................................................................ 19
Oil Charge ..................................................................................................................................................... 20
Compressor Motor Rotation ......................................................................................................................... 20
Final Checks.................................................................................................................................................. 21
Control Settings............................................................................................................................................. 21
Electronic Oil Level Control .......................................................................................................................... 22
Auxiliary Systems .......................................................................................................................................... 22
Temperature Termination (Digital Mode)...................................................................................................... 22
Offtime Defrost.............................................................................................................................................. 23
Sensor Applications ....................................................................................................................................... 23
Suction Pressure Sensor ........................................................................................................................... 23
SERVICE
Service and Maintenance ............................................................................................................................... 24
Compressor Replacement ............................................................................................................................ 24
Replacing Drier.............................................................................................................................................. 25
Checklist........................................................................................................................................................ 26
Sequence of Operation................................................................................................................................... 28
Replacement Parts ......................................................................................................................................... 31
Warranty Information ................................................................................................................................... 32

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Installation
Overview
This section is limited to the information needed to setup the Proto-Aire EZ Unit.
Shipping Damage
All equipment should be thoroughly examined for shipping damage before and while unloading.
This equipment has been carefully inspected at our factory, and the carrier has assumed
responsibility for safe arrival. If damaged, either apparent or concealed, the claim must be made
to the carrier.
Apparent Loss or Damage
If there is an obvious loss or damage, it must be noted on the freight bill or 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 concealed
damage is made. Upon discovering damage, make request in writing to carrier for inspection
within 15 days and retain all packing. The carrier will supply inspection report and required
claim forms.
On Site Damage Control
The Proto-Aire EZ Unit is shipped on skids with panels installed. Remove panels to access lifting
points on frame. Do not attempt to move the unit from the skids without rst removing the
panels.

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Proto-Aire EZ UNIT NOMENCLATURE
The model numbers for Proto-Aire EZ units are shown on the legend in modular
form. The nomenclature is interpreted as follows:
The unit nomenclature is part of the UL code requirements and must
be included on the legend as well as the data plate for each unit.
MR O Z 3 21 M T K
Voltage K = 208/3/60; D = 208/1/60
M = 460/3/60
M = Medium Temp. L = Low Temp.
D = Dual (Split Suction Temp.)
Sum of Compressor Horse Power
Total Number of Compressors
Z = Scroll
O = Outdoor
MR = Proto-Aire EZ
Refrigerant: F = 407F; Q = 407A;
R = 449A; S = 404A; T = 448A

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MOVING THE UNIT
It is the responsibility of the installer to ensure that the nal equipment installation meets all
applicable code requirements. Illustrations shown on the next pages are only for general representation.
Actual product will vary depending on application. Be sure that lifting cables/straps do not damage
piping stubs, coil surface, orventilation shroud. Full perimeter support foundation required.
N.E.C. and local electrical code restrictions must be followed for electrical clearances and all
other installation requirements.
50
57
119 MIN
90.5
A
DETAIL A
4X
ATTACH
LIFTING
SHACKLES
HERE.
119" MIN
SPREADER BARS
130" MIN
APPROX OVER ALL DIMENSION OF THE UNIT: 140.0" L X 61.2" W X 50.0" H.
COMPRESSORS: MAX 4 SCROLL COMPRESSORS.
WEIGHT DETAILS-
3 COMPRESSOR UNIT: 2437 SHIPPING WEIGHT / 2505 OPERATING WEIGHT.
4 COMPRESSOR UNIT: 2637 SHIPPING WEIGHT / 2737 OPERATING WEIGHT.
TYPE OF LIQUID DRIER: SEALED / REPLACEABLE CORE.
TYPE OF SUCTION FILTER : SEALED / REPLACEABLE CORE.
119" MIN
SPREADER BARS
130" MIN
APPROX OVER ALL DIMENSION OF THE UNIT: 140.0" L X 61.2" W X 50.0" H.
COMPRESSORS: MAX 4 SCROLL COMPRESSORS.
WEIGHT DETAILS-
3 COMPRESSOR UNIT: 2437 SHIPPING WEIGHT / 2505 OPERATING WEIGHT.
4 COMPRESSOR UNIT: 2637 SHIPPING WEIGHT / 2737 OPERATING WEIGHT.
TYPE OF LIQUID DRIER: SEALED / REPLACEABLE CORE.
TYPE OF SUCTION FILTER : SEALED / REPLACEABLE CORE.
121" MIN

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57 60
AIR INTAKE
AIR DISCHARGE
CONDENSER
SUCTION FILTERS
OPTIONAL VERTICAL
ORIENTATION IS
AVAILABLE
LIQUID DRIER
OPTIONAL VERTICAL
ORIENTATION IS
AVAILABLE
SCROLL COMPRESSORS
OIL SEPARATOR
CONTROL PANEL
OIL FILTER
OIL MANIFOLD
61.15
49.85
57.00
HINGED
TOP
COVERS
33"
OUTER SPLIT
HINGED
EXTERIOR
DOORS
Small Unit Large Unit
Approximate Operating Weight (lbs.) 2180 2737
Shipping Weight 2080 2637
Refrigerant R448A/R449A/407A/407F/404A
Unit Charge (Summer) lbs 2 Row – 8; 5 Row – 15; 6 Row – 22 LAHB13412/10 – 15.4; LAHB13310 – 12.1
Unit Charge (Winter) 2 Row – 24; 5 Row – 56; 6 Row – 82 LAHB13412/10 – 61.6; LAHB13310 –
R448A/R449A/407A/407F/404A
45.4
Receiver Capacity at 80% 98 98
MINIMUM CLEARANCE REQUIREMENTS:
Provide clearances as shown on Pages 8 and 9 to ensure adequate airow, reduce the potential
for air recirculation, facilitate service accessibility, and to maintain compliance with electrical
code requirements. It is the responsibility of the installer to ensure that the nal equipment
installation meets all applicable code requirements. Suggested rigging setup is illustrated. Be sure
that lifting cables/straps do not damage piping stubs, coil surface, or rain guard. Full perimeter
support under unit rail foundation required.
Proto-Aire EZ — Physical Data

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48" MIN
48" MIN
48" MIN
54" MIN
EXTERIOR
HINGED
RH DOOR
CONTROL
PANEL
ACCESS
DOOR
EXTERIOR
HINGED
LH DOOR
14.0
2X
HEAT RCLM LINES
7.0
LIQ LINE
10.0
SUCT LINE 2
10.5
SUCT LINE 1
11.0
SUCT LINE 2
16.5
LIQ LINE
18.0
SUCT LINE 1
9.0
FROM
HEAT RCLM
15.5
TO
HEAT RCLM
Proto-Aire EZ — Stub Out Locations

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FRONT VIEW
REAR VIEW
TEMP SENSOR IS
FASTENED TO THE VERT
SUPPORT ON THE COND
SIDE WITH THE HELP OF
SELF TAPPING SCREW
#0700900.
REAR GRILLE IS
OPTIONAL SHOWN
HERE FOR
REFERENCE.
0427001
BRACKET-AMB
TEMP SENSOR
LARGE PTD SKIN
REAR VIEW
133.75
50.01
57.00
134.00
41.03
AMBIENT TEMP SENSOR MOUNTING.
REAR GRILLE IS
OPTIONAL
SHOWN HERE
FOR
REFERENCE.
55.00
3.98
61.15 55.25
LARGE PTD SKIN
NOTE
Dimensions shown in inches.