Hussmann MZ3-S Installation & Operation Manual

Manual

Installation

& Operation

REV. 0909

/CHINO

MZ3-S

MULTI-ZONE REFRIGERATED, SELF SERVICE,

SELF CONTAINED

MZ3-S

MULTI-ZONE REFRIGERATED, SELF SERVICE,

SELF CONTAINED

P/N IGSS-MZ3-S-0909

INSTALLATION & OPERATION GUIDE

General Instructions

This equipment is to be installed
to comply with the applicable
NEC, Federal, State , and Local
Plumbing and Construction
Cod e h a ving jur i s d i ction.

IGSS-MZ3-S-0909

Table of Contents

General Instructions.....................................................2

Cut and Plan Views ......................................................3

Installation .....................................................................4

Location ..................................................................................... 4

Uncrating the Stand ................................................................... 4

Exterior Loading ......................................................................... 4

Leveling .....................................................................................4

Plumbing .......................................................................4

Self Contained Cases ................................................................ 4

Installing Condensate Drain (When Applicable) ........................ 4

Refrigeration .................................................................5

Refrigerant Type ........................................................................ 5

Control Settings - Remote ......................................................... 5

Access to TX Valves and Drain Lines ........................................ 5

Electronic Expansion Valve (Optional) ....................................... 5

Thermostatic Expansion Valve Location .................................... 5

Expansion Valve Adjustment ..................................................... 5

Measuring the Operating Superheat.......................................... 5

Omni-STAT Location .................................................................. 5

Refrigeration Data ...................................................................... 6

Defrost Data ............................................................................... 6

Physical Data ............................................................................. 6

Glycol Requirements ................................................................. 6

Electrical........................................................................7

Wiring Color Code ..................................................................... 7

Electrical Circuit Identication .................................................... 7

Electrical Service Receptacles (When Applicable) .................... 7

Attachment Plugs ....................................................................... 7

Field Wiring and Serial Plate Amperage .................................... 7

Ballast Location .........................................................................7

User Information ........................................................... 8

Stocking ..................................................................................... 8

Important Steps ........................................................................8

Case Cleaning ........................................................................... 8

Cleaning Glass and Mirrors ....................................................... 9

Plexiglass and Acrylic Care ....................................................... 9

Cleaning ..................................................................................... 9

Antistatic Coatings ..................................................................... 9

Maintenance .................................................................. 9

Replacing Fluorescent Lamps ................................................... 9

Evaporator Fans ........................................................................ 9

Copper Coils .............................................................................. 9

Tips and Troubleshooting .......................................................... 9

Stainless Steel Cleaning and Care .......................................... 10

Wiring Diagram ........................................................... 11

Piping Schematic........................................................13

Appendices ................................................................14

Appendix A. - Temperature Guidelines .................................... 14

Appendix B. - Application Recommendations .......................... 14

Appendix C. - Field Recommendations ................................... 14

Appendix D. - Recommendations to user ................................ 15

This Booklet Contains Information on:
MZ3 Self Contained:

The MZ3 is a multi-zone, self-service, self-contained,
refrigerated merchandiser which contains low and medium
temperature refrigerated zones and an additional dry
shelf zone to accommodate multiple product refrigeration
requirements. For low temperature needs, the MZ3 uses
Hussmann's FMSS-LT case and for medium Temperature
needs, the MZ3 uses Hussmann's RCD case. Both are
combined in a convenient single case package.

SHIPPING DAMAGE

All equipment should be thoroughly examined for shipping
damage before and during 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, 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 express receipt and signed by the carrier’s
agent; otherwise, carrier may refuse claim. The carrier will
supply 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. Make

request in writing to carrier for inspection within 15 days,
and retain all packaging. The carrier will supply inspection
report and required claim forms.

SHORTAGES

Check your shipment for any possible shortages of
material. If a shortage should exist and is found to be the
responsibility of Hussmann Chino, notify Hussmann Chino.
If such a shortage involves the carrier, notify the carrier
immediately, and request an inspection. Hussmann Chino
will acknowledge shortages within ten days from receipt
of equipment.

HUSSMANN CHINO PRODUCT CONTROL

The serial number and shipping date of all equipment

has been recorded in Hussmann’s les for warranty and

replacement part purposes. All correspondence pertaining
to warranty or parts ordering must include the serial number
of each piece of equipment involved, in order to provide
the customer with the correct parts.

The Hussmann warranty is printed on the back of

this guide.

Keep this booklet with the case at all times for future reference.

/CHINO

A publication of Hussmann® Chino
13770 Ramona Avenue • Chino, California 91710
[phone] FAX
[phone]
[phone]

2

Rev. 0909

83 3/8"

12 3/4"

33 1/2"

54"

64"

71"

6"

20 1/4"

18 1/4"

16 1/4"

37 1/4"

30 7/8"

27 5/8"

19 3/4"

10 7/8"

9 3/8"

9 3/8"

1 5/8"

1 7/8"

1 7/8"

1 5/8"

50 3/8"

47 1/4"

37 1/4"

6"

ELECTRICAL CONNECTION
2 POWER CORDS

1. NEMA 5-15P

2. NEMA L5-20P

MZ3-4S

PLAN VIEW

RCD

FMSS-LT

Condensing

Unit

MZ3

SELF SERVICE MERCHANDISER

Cut and Plan Views

3

Installation

It is the contractor's responsibility to install

case(s) according to local construction and

health codes.

Location

The refrigerated merchandisers have been designed
for use only in air conditioned stores where temperature
and humidity are maintained at or below 75°F and 55%
relative humidity. DO NOT allow air conditioning, electric
fans, ovens, open doors or windows (etc.), to create air
currents around the merchandiser, as this will impair its
correct operation.

Product temperature should always be maintained at a
constant and proper temperature. This means that from the
time the product is received, through storage, preparation
and display, the temperature of the product must be
controlled to maximize life of the product.

Uncrating the Stand

Place the xture as close to its permanent position as

possible . Remove the top of the crate. Detach the walls
from each other and remove from the skid. Unbolt the case

from the skid. The xture can now be lifted off the crate

skid. Lift only at base of stand!

Exterior Loading

These models have not been designed to support excessive
external loading. Do not use the lower surfaces, glass,

or shelves as a stepping ladder. Do not stand in Lower
cases to gain access to the upper portion of the case.
Do not stand on any opening in the side panels. Failure

to observe these warnings could result damage to the case
and serious personal injury.

IGSS-MZ3-S-0909

Leveling
IMPORTANT! It is imperative that cases be leveled from
front to back and side to side. A level case is necessary
to insure proper operation, water drainage, glass
alignment, and operation of the hinges supporting
the glass. Leveling the case correctly will solve most
hinge operation problems.

NOTE: A. To avoid removing concrete ooring, begin lineup

leveling from the highest point of the store oor.

B. When wedges are involved in a lineup, set them rst.

All cases were leveled and joined prior to shipment to

insure the closest possible t when cases are joined in the
eld. When joining, use a carpenters level and shim legs

accordingly. Case must be raised correctly, under legs
where support is best, to prevent damage to case.

1. Check level of oor where cases are to be set.
Determine the highest point of the oor; cases will

be set off this point.

2. Level and set the case. Case must be raised under
legs where support is best to prevent damage to
case. Internal bracing may be removed at this time.

Plumbing

Self Contained Cases

MZ3 self-contained cases do not require that a condensate
drain be connected because all of the condensate is
contained by the condensate pan. However it is required
that the condensate pan be cleaned on a regular basis.
Additionally, the condensing unit should be cleaned at the
same time using a light, non-abrasive brush to remove

accumulated dust. If a lter is installed, it should be cleaned

at this time as well.

Installing Condensate Drain (When Applicable)

Poorly or improperly installed condensate drains can
seriously interfere with the operation of this refrigerator, and
result in costly maintenance and product losses. Please
follow the recommendations listed below when installing
condensate drains to insure a proper installation:

1 . Never use pipe for condensate drains smaller

than the nominal diameter of the pipe or P-TRAP
supplied with the case.

2 . When connecting condensate drains, the P-TRAP

must be used as par t of the condensate drain
to prevent air leakage or insect entrance. Store

plumbing system oor drains should be at least 14"

off the center of the case to allow use of the P-TRAP
pipe section. Never use two water seals in series in
any one line . Double P-TRAPS in series will cause
a lock and prevent draining.

3 . Always provide as much down hill slope (“fall”) as

possible; 1/8" per foot is the preferred minimum.

PVC pipe, when used, must be supported to

maintain the 1/8" pitch and to prevent warping.

4 . Avoid long runs of condensate drains. Long runs

make it impossible to provide the “fall” necessary for
good drainage.

5 . Provide a suitable air break between the ood rim of

the oor drain and outlet of condensate drain. 1" is

ideal.

4

Rev. 0909

Plumbing (Cont'd)

6 . Prevent condensate drains from freezing:

a. Do not install condensate drains in contact with

non-insulated suction lines. Suction lines should
be insulated with a nonabsorbent insulation

material such as Armstrong’s Armaex.

Refrigeration

Refrigerant Type

The standard refrigerant will be R-404 unless otherwise

specied on the customer order. Check the serial plate on

the case for information.
Piping for more than one case on a condensing unit is run

underground with either common suction and liquid lines
from the machine room or individual suction and liquid lines
joined together in the machine room.

Refrigeration Lines

LIQUID SUCTION
3/8” O.D. 5/8” O.D.

NOTE: The standard coil is piped at 5/8” (suction); however,

the store tie-in may vary depending on the number
of coils and the draw the case has. Depending on the
case setup, the connecting point in the store may be
5/8”, 7/8”, or 1 1/8”. Refer to the particular case you are
hooking up.

Refrigerant lines should be sized as shown on the
refrigeration legend furnished by the store.

Install P-TRAPS (oil traps) at the base of all suction line
vertical risers.

Pressure drop can rob the system of capacity. To keep the
pressure drop to a minimum, keep refrigerant line run as
short as possible, using the minimum number of elbows.
Where elbows are required, use long radius elbows only.

Control Settings - Remote

See the MZ3-S Technical Data Sheet for the appropriate
settings for your merchandiser. Maintain these parameters
to achieve near constant product temperatures. Product

temperature should be measured rst thing in the morning,

after having been refrigerated overnight. Defrost times
should as directed in the MZ3-S Technical Data Sheet.
The number of defrosts per day should never change.
The duration of the defrost cycle may be adjusted to meet
conditions present at your location.

Control Settings-self Contained

All functions are controlled by Omni-Stat Controllers. See
MZ3-S Technical Data Sheet for proper temperature and
defrost settings.

Access to TX Valves and Drain Lines

MECHANICAL - Remove product from end of case.
Remove product racks. Remove refrigeration and drain
access panels (labeled). TX valve (mechanical only) and
drain are located under each access panel at end of the
case.

b. Where condensate drains are located in dead

air spaces (between refrigerators or between a
refrigerator and a wall), provide means to prevent
freezing. The water seal should be insulated to
prevent condensation.

ELECTRONIC - The Electronic Expansion valve master
and slave cylinder(s) are located within the electrical
access panel(s).

Electronic Expansion Valve (Optional)

A wide variety of electronic expansion valves and case
controllers can be utilized. Please refer to EEV and
controller manufacturers information sheet. Sensors for
electronic expansion valves will be installed on the coil inlet,
coil outlet, and in the discharge air. (Some supermarkets
require a 4th sensor in the return air). Case controllers will
be located in the electrical raceway or under the case.

Thermostatic Expansion Valve Location

This device is located on the same side as the refrigeration
stub. An Alco balanced port expansion valve model
is furnished as standard equipment, unless otherwise

specied by customer.

Expansion Valve Adjustment

Expansion valves must be adjusted to fully feed the
evaporator. Before attempting any adjustments, make sure
the evaporator is either clear or very lightly covered with

frost, and that the xture is within 10° F of its expected

operating temperature.

Measuring the Operating Superheat

1. Determine the suction pressure with an accurate
pressure gauge at the evaporator outlet.

2. From a refrigerant pressure temperature chart,
determine the saturation temperature at the
observed suction pressure.

3. Measure the temperature of the suction gas at the
thermostatic remote bulb location.

4. Subtract the saturation temperature obtained in step
No. 2 from the temperature measured in step No. 3.
The difference is superheat.

5. Set the superheat for 5°F - 7° F

Omni-STAT Location

The Omni-Stat case controllers are located in the access
area in the right end panel. To gain access, remove the
right louvered panel. Please refer to the MZ3-S Technical
Data Sheet for the proper recommended temperature and
defrost settings.

5

ELECTRICAL CONNECTION
2 POWER CORDS

1. NEMA 5-15P

2. NEMA L5-20P

MZ3-4S

PLAN

RCD

FMSS-LT

Condensing

Unit

MZ3

SELF SERVICE MERCHANDISER

OMNI-STAT
TEMPERATURE
CONTROLLER
&
BALLASTS

OMNI-STAT
TEMPERATURE
CONTROLLER
&
BALLASTS

ACCESS
COVER

FRONT

Refrigeration (Cont'd)

IGSS-MZ3-S-0909

Refrigeration Data

Note: This data is based on store temperature and humidity

that does not exceed 75F and 55% R.H.

Discharge Air (F) 28

Evaporator (F) 20

Note: Not recommended to control temp by regulating coil

temp allow T-STAT to cycle and control temp.

Btu/hr/ft*

Parallel 400
Conventional 460
Low Temp

Discharge Air (F) -10

Evaporator (F) -20

Note: Not recommended to control temp by regulating coil

temp allow T-STAT to cycle and control temp.

Btu/hr/ft*

Parallel 600
Conventional 690

*For all refrigeration equipment other than Hussmann, use
conventional Btu values.

Defrost Data
Frequency Hrs 8

OFFTIME
Temp Term °F 54
Failsafe Minutes 30
ELECTRIC or GAS Not Recommended

Physical Data

Merchandiser Drip Pipe (in.) 1½
Merchandiser Liquid Line (in.) 3/8
Merchandiser Suction Line (in.) 5/8
Estimated Charge (lb)***

4ft 1.2

5ft 1.5

6ft 1.8

*** This is an average for all refrigerants types. Actual
refrigerant charge may vary by approximately half a
pound.

Glycol Requirements

GPM PSI

N/A N/A

6