Stulz SCS-024 User manual

Mini-Space EC
DX and CW
4 –12 kW Systems
Vertical Floor Mounted, 60 Hz Data
Installation, Operation and Maintenance Manual

Mini-Space EC Floor Mounted Systems
Model Nomenclature
CCXXXXXEC
CC Air Pattern Capacity (kW) Refrigerant Circuits Cooling Method Blower Type
Mini-Space Compact
System
D=Downflow
U=Upflow
R=Rear Return
F=Front Discharge
04
06
08
11
12
0
1
A=Air
W=Water
G=Glycol
C=Chilled Water
EC
Example:
12 kW capacity, downflow air pattern, 1 circuit, water-cooled DX, EC fans: CCD121WEC
Notice
This document contains information protected by copyright. All rights are reserved. The owner of the equipment for which this manual is
written may photocopy the contents of this manual for internal use only. No part of this document may be photocopied, reproduced, or
translated into another language for use by anyone other than the owner of the equipment for which this manual is written without the prior
written consent of STULZ Air Technology Systems, Inc. (STULZ).
This document contains confidential and proprietary information of STULZ. Distributing or photocopying this document for external distri-
bution is in direct violation of U.S. copyright laws and is strictly prohibited without the express written consent of STULZ.
Unpublished — rights reserved under the copyright laws of the United States and of other countries.
Other brands and tradenames are trademarks oftheir respective owners.
Copyright 2017 by STULZ AirTechnology Systems, Inc.
Printed in the United States of America.
All rights reserved.
STULZ Air Technology Systems, Inc.
1572 Tilco Drive
Frederick, MD 21704
USA

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MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Table of Contents
1.0 Introduction..................................................... 1
1.1 General..............................................................................1
1.2 Product Description .....................................................1
1.3 Safety ................................................................................1
1.3.1 General..............................................................................1
1.3.2 Safety Summary.............................................................1
1.4 General Design...............................................................3
1.4.1 Electric Box Access......................................................3
1.4.2 Circuit Breakers / Motor Start Protectors............3
1.4.3 Heaters (Optional).........................................................3
1.4.4 Coil......................................................................................4
1.4.5 EC Fan...............................................................................4
1.4.6 Temperature/Humidity Sensor.................................4
1.4.7 Controller..........................................................................4
1.5 Optional Equipment......................................................4
1.5.1 Humidifier (Optional) ....................................................4
1.5.2 Condensate Pump........................................................4
1.5.3 Smoke Detector ............................................................4
1.5.4 Firestat .............................................................................4
2.0 Installation....................................................... 5
2.1 Receiving the Equipment............................................5
2.2 Site Preparation.............................................................5
2.3 Rigging..............................................................................6
2.4 Mounting/Placement...................................................6
2.4.1 Outdoor Equipment......................................................7
2.5 Optional Equipment (Field Installed).......................7
2.5.1 Floor Stand......................................................................7
2.5.2 Plenum Box Assembly.................................................7
2.5.3 Remote Display..............................................................7
2.5.4 Condensate Pump........................................................8
2.5.5 Remote Temperature/Humidity Sensor................8
2.5.6 Remote Water Detector..............................................8
2.6 Air Distribution Connection........................................8
2.6.1 Downflow Configuration Air Patterns
(CCD/CCF).......................................................................8
2.6.2 Upflow Configuration Air Patterns
(CCU/CCR)......................................................................8
2.7 Piping Connections ......................................................9
2.7.1 Refrigerant.......................................................................9
2.7.1.1 Self-Contained Systems.............................................9
2.7.1.2 Split Systems ..................................................................9
2.7.2 Water/Glycol, Chilled Water and Hot Water
Reheat Piping..............................................................12
2.7.3 Pump Package............................................................12
2.7.4 Condensate Drain Line.............................................12
2.7.4.1 Gravity Drain.................................................................12
2.7.4.2 Condensate Pump.....................................................12
2.7.5 Humidifier .....................................................................12
2.8 Utility Connections.....................................................13
2.8.1 Main Power...................................................................13
2.8.1.1 Single-Phase Units 208/230V............................14
2.8.1.2 Three-Phase Units.....................................................14
2.8.2 Controls .........................................................................14
2.8.3 Optional Equipment...................................................14
2.8.3.1 Condensate Pump.....................................................14
2.8.3.2 Remote Temperature/Humidity Sensor.............14
2.8.3.3 Remote Water Detector...........................................15
2.8.4 Split Systems ...............................................................15
2.8.4.1 Glycol Systems............................................................15
2.8.4.2 Remote Condenser....................................................15
2.9 System Charging Procedures................................15
2.9.1 Water-Water/Glycol Cooled Systems...................15
2.9.2 Pump ..............................................................................15
2.9.3 Remote Air-Cooled Systems..................................15
2.9.4 Estimating Refrigerant Charge..............................17
2.9.4.1 Preparing the System For Charging.....................17
2.9.4.2 Evacuate the System.................................................17
2.9.4.3 Refrigerant Charging Procedure.............................18
2.9.4.4 -30 °F Ambient Applications..................................19
2.10 System Settings and Adjustments .......................19
2.10.1 Low/High Pressure Limit Switch .........................19
2.10.2 Head Pressure Controls-Air Cooled Systems..20
2.10.2.1 -20°F Condenser Fan Speed ................................20
2.10.2.2 -30°F Flooded Head Pressure Control..............20
2.10.3 Head Pressure Controls-Water/Glycol
Cooled Systems..........................................................20
2.10.4 Humidifier Adjustment..............................................20
2.10.5 Thermal Expansion Valve.........................................20
2.10.6 Hot Gas Reheat (Optional).......................................21
2.10.7 Snap Acting Hot Gas Bypass (Optional).............21
2.11 Refrigerant Characteristics.....................................21

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MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
2.11.1 Pressure/Temperature Settings...........................21
2.11.2 Saturated Refrigerant Pressure............................21
3.0 Start-Up/Commissioning............................. 22
3.1 Operation ......................................................................22
3.2 Step-by-Step Start-Up Instructions....................22
3.3 Unit Shutdown.............................................................22
3.4 Microprocessor Controller Programming .........22
4.0 Maintenance .................................................. 23
4.1 Periodic General Maintenance ..............................23
4.1.1 Filter................................................................................23
4.1.2 Drain Pan.......................................................................23
4.1.3 Coils ................................................................................23
4.1.4 Heat/Reheat................................................................23
4.1.5 Humidifier......................................................................23
4.1.6 Condensate Pump.....................................................24
4.1.7 Condenser ....................................................................24
4.1.8 Pump Package............................................................24
4.2 Troubleshooting..........................................................24
4.3 Field Service.................................................................28
4.3.1 Leak Detection............................................................28
4.3.2 Leak Repair ..................................................................28
4.3.3 Refrigerant Piping......................................................28
4.3.4 General Common Repairs/Component Re-
placement .....................................................................28
4.3.4.1 Compressor Failure ..................................................28
4.3.4.2 Standard Clean out Procedure..............................29
4.3.4.3 Burn-Out/Acid Cleanup Procedure.....................29
4.3.4.4 Humidifier Cylinder Replacement.........................29
4.3.4.5 Filter Replacement ....................................................30
5.0 Product Support............................................ 30
5.1 Technical Support ......................................................30
5.2 Obtaining Warranty Parts ........................................30
5.3 Obtaining Spare/Replacement Parts..................31
Figures
Figure 1. Typical Upflow Internal Layout (Model
CCU041AEC shown for reference) ..............3
Figure 2. Installation Clearance..............................................5
Figure 3. Typical Installation.....................................................6
Figure 4. Optional Floor Stand Installation .........................7
Figure 5. Downflow Configuration Typical Air
Patterns.....................................................................10
Figure 6. Upflow Configuration Typical Air Patterns.....11
Figure 7. Condensate Pump.................................................13
Figure 8. Sample Nameplate................................................13
Figure 9. Interconnecting Field Wiring - Glycol
Systems.....................................................................16
Figure 10. Interconnecting Field Wiring - Remote
Condenser................................................................16
Tables
Table 1. Equivalent Line Size Chart.....................................9
Table 2. Recommended Liquid Line Sizes........................9
Table 3. Recommended Discharge Line Sizes.............12
Table 4. Estimated Refrigerant Charge Weight
for STULZ SCS Condensers..............................17
Table 5. Weight of R410A Refrigerant
(lbs/100 ft of type L tubing)...............................17
Table 6. R410A Pressure/Temperature Settings.......21
Table 7. R410A Refrigerant Pressure.............................21
Table 8. Troubleshooting Guide.........................................25

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MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
1.0 INTRODUCTION
1.1 General
TheMini-Space EC™floormounted precision airconditioning
system covered bythis manual is designed and manufactured
by STULZ Air Technology Systems, Inc. (STULZ) using
the latest state-of-the-art control technology. The unit
will provide years of trouble free service if installed and
maintained in accordance with this manual. Damage to the
unit from improper installation, operation or maintenance is
not covered by the system warranty.
Study the instructions in this manual; they must be followed
to avoid difficulties. Spare parts are available from STULZ
to insure continuous operation. Using substitute parts or
bypassing electrical or refrigeration components in order
to continue operation is not recommended and will void the
warranty. Due to technological advancements, components
are subject to change without notice.
Mini-Space EC systems and centrifugal condensers are
designed to be installed indoors, unless otherwise noted on
the equipment. Propeller-type condensers, drycoolers and
pump packages are designed for outdoor use.
1.2 Product Description
The DX-based versions of the Mini-Space EC precision A/C
system are available in air-cooled, water-cooled and glycol-
cooled configurations.Achilled waterconfiguration ofthe unit
is also available. The cooling capacity in kW will depend on
the unit size, which can range from 4kW (12 MBH) to 14 kW
(48 MBH). Mini-Space EC systems are designed to operate
with R410A refrigerant.
NOTE
Mini-Space EC systems are designed to supply air
to only one room.
The functional modes of operation in addition to cooling are
heating, humidification, dehumidification and filtration,which
provide complete environmental control of a conditioned
space.The cabinet is available in onefootprint size:A compact
23.8 inches wide by 22.7 inches deep.
The cabinet is designed for convenient, 100% front access.
There are four airflow pattern configurations; upflow,
downflow, rear return, and front discharge. The basic
cabinet height remains the same, (72.8”), regardless of the
configuration. An optional plenum box may be selected (for
upflowand rear-return units only),which adds an extra 18.5”
to the height. Seethe installation drawing providedwith your
unit for the layout and dimensions of the cabinet.
The Mini-Space EC unit is provided with a factory-mounted
main power disconnect switch with a lockable handle. The
disconnect switch electricallyisolates the unit during routine
maintenance. The system incorporates state-of-the-art
component protection withthe use of motorstart protectors
and circuit breakers.
Mini-Space EC units have a STULZ E²series microprocessor
controllerthat provides a full alarm system, status monitoring,
cooling/humidification control, multi-system networking and
BMS integration.
1.3 Safety
1.3.1 General
Note, caution and warning statements are used in this
manual to draw attentionto important operational and safety
information.
• A bold text NOTE marks an important detail.
• A bold text CAUTION safety alert conveys
information importantfor protectingyourequip-
ment and performance. Be especiallycarefulto
read and follow all cautions that apply to your
application.
• A bold text WARNING safety alert conveys
information important for protecting you from
harm. Pay very close attention to all warnings
that apply to your application.
Asafetyalert symbol precedesageneral WARNING
or CAUTION statement.
An electrical shock symbol   precedes an electrical
shock WARNING safety statement.
1.3.2 Safety Summary
The following statements are general guidelines. They are
followed by warnings and cautions applicable to the Mini-
Space EC system.
• Prior to performing any installation, operation,
maintenance or troubleshooting procedure
read and understand all instructions, recom-
mendations and guidelines contained within
this manual.
• Never operate the unit with any cover, guard,
screen panel, etc., removed unless the instruc-
tions specifically state otherwise, and then do
so with extreme cautionto avoid personal injury.
• Never lift any component in excess of 35
pounds without help. If a lifting device is used
to move a unit, ensure it is capable of support-
ing the unit.

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MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
• When working on electrical equipment, remove
all jewelry, watches, rings, etc.
• Always disconnect the main power supply to
the equipment at the main power disconnect
switch before beginningwork on the equipment.
A lock-out/tag-out procedure should be fol-
lowed to ensure that power is not inadvertently
reconnected.
• Neverwork on electrical equipment unless an-
other person who is familiar with the operation
and hazards of the equipment and competent
to administer first aid is nearby.
• All personnel working on or near equipment
should be familiar with the hazards associated
with electrical maintenance. Safety placards/
stickers have been placed on the unit to call
attention to personal and equipment damage
hazards.
• Certain maintenance or cleaning procedures
may call for the use and handling of chemicals,
solvents, orcleansers. Always referto the manu-
facturer’s SafetyData Sheet (SDS) priorto using
these materials. Clean parts in awell-ventilated
area. Avoid inhalation of solvent fumes and
prolonged exposure ofskin to cleaning solvents.
Wash exposed skin thoroughly after contact
with solvents.
WARNING
This equipment should be serviced and repaired
only by a journeyman refrigeration mechanic or air
conditioning technician.
WARNING
This unit employs high voltage equipment with
rotating components. Exercise extreme care to
avoid accidents.
WARNING
Hazardous voltage will still be present inside the
electric box at the motor start protectors and
circuit breakers when the unit is turned off at the
microprocessor controller. To isolate the unit for
maintenance, turn off power at the main power
disconnect switch. Always disconnect main power
prior to performing any service or repairs.
WARNING
Refrigerant (R410A) is used with this equipment.
Death or serious injury may result if personnel fail
to observe proper safety precautions. Great care
must be exercised to prevent contact of liquid
refrigerant or refrigerant gas, discharged under
pressure, with any part of the body. The extremely
lowtemperature resulting from the rapid expansion
of liquid refrigerant or pressurized gas can cause
sudden and irreversible tissue damage.
As a minimum, all personnel should wear thermal
protective gloves and face-shield/goggles when
working with refrigerant. Application of excessive
heat to any componentwill cause extreme pressure
and may result in a rupture.
Exposure of R410Arefrigerantto an open flame or a
very hot surface can cause a chemical reaction that
forms fluorophosgene (carbonyl fluoride), a highly
poisonous and corrosive gas.
In its natural state, refrigerant is a colorless, odorless
vaporwith no toxic characteristics. It is heavier than
air andwill disperse rapidly in awell-ventilated area.
In an unventilated area, it presents a danger as a
suffocant.
WARNING
When performing soldering or de-soldering
operations, make certain the refrigeration system is
fully recovered and purged and dry nitrogen is flowing
through the system at the rate of not less than 1–2
CFM (0.030.06M³/minute).
CAUTION
When the air conditioner is in the cooling mode, the
return air-intake and discharge (supply) openings
must be free of obstructions. Ensure access panels/
doors are secure and latched into position.
CAUTION
Do not use cleaning solvents near open flame or
excessive heat. Wear eye protection when blowing
solvent from parts. The pressure-wash should
not exceed 30 psig. Solvent solutions should be
disposed of in accordance with local and state
regulatory statutes.
CAUTION
The unit must be kept in its normal installed
position when moving. If the unit is not kept level
and vertical, damage to the compressor will result.

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MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
1.4 General Design
The Mini-Space EC unit is housed in a steel frame cabinet rated for indoor use. The exterior of the cabinet has a powder coat
finish to protect against corrosion. A hinged door on the front of the cabinet gives access to components. Operator controls
are conveniently located on the cabinet door.
Figure 1 depicts a typical internal layout of a CCU041AEC (upflow) unit and identifies the major components. Location of
the major components vary depending on the purchased Mini-Space EC model and options.
FILTER
(BEHIND
FRONT DOOR)
MAIN POWER
DISCONNECT
SWITCH
GRAPHIC TERMINA
L
DOOR LATCH
(3 PLACES)
EC FAN
COIL
CONDENSATE
DRAIN PAN
RECEIVER HUMIDIFIER
SMOKE DETECTOR
T/H SENSOR
FIRESTAT
ELECTRIC BOX
(BEHIND FRONT DOOR)
COMPRESSOR
HEATER
(ELECTRIC)
Figure 1. Typical Upflow Internal Layout (Model CCU041AEC shown for reference)
1.4.1 Electric Box Access
Electrical components are protected by the front access
door, which is locked in three places. To open the front door,
turn the door locks with the triangular key wrench provided.
The front door is also safety interlocked with the main power
disconnect switch, preventing the door from opening when
the switch is in the “On” position. The switch must be turned
to the “Off” position to gain access to the electric box.
The main power disconnect switch may be used to turn the
unit offforemergencyshutdown orwhen routine maintenance
is performed. The handle of the switch may be locked in the
“Off” position to prevent unintended operation.
1.4.2 Circuit Breakers / Motor Start
Protectors
Individual overload protection is provided bycircuit breaker(s)
and motorstart protectors.These switches must be manually
reset once the overload condition is cleared.
1.4.3 Heaters (Optional)
Heaters may be furnished for reheating the supply air, as
required to offset the sensible cooling of the system during
the dehumidification cycle, and for the automatic heating
mode. As a standard, electric resistance heating elements are
factory installed inthe supply airstreamto heat the supply air.
As an option, hot gas reheat may be purchased. A hot gas

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MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
heating coil is factoryinstalled in the supply airstream to heat
the supply air. Avalve is providedto control theflow ofhot gas
through the coil to maintain the correct reheat temperature.
1.4.4 Coil
The cooling and optional hot gas reheating coils are aluminum
finned/copper tube construction. The coils are leak tested
and cleaned before installation by the factory.
1.4.5 EC Fan
The unit is equipped with a high efficiency Electronically
Commutated (EC) fan. EC fans have a brushless motor
equipped with permanent magnets and permanently
lubricated ball bearings. The fan impellers are backwards
curved and attached to the rotor casing. The fan is balanced
and aerodynamically optimized to minimize vibration.
The fan does not use a drive belt. Fan speed is variable via a
010VDC signal from the system controller. The fan motor is
equipped with integral electronics such asthermal protection,
inverters orfilters. The fanwill not produceAC inverterwhine.
1.4.6 Temperature/Humidity Sensor
As a standard for room air control, a temperature/humidity
(T/H) sensor is factory mounted in the return air stream.
The (T/H) sensor monitors the return air conditions and
provides input signal(s) to the system controller to manage
the operation of the A/C unit consistent with the setpoints
entered in the system controller. As an option, sensor(s) may
be shipped loose for field installation. Refer to the electrical
drawing supplied with your unit for details specific to your
system.
1.4.7 Controller
Mini-Space EC units have a STULZ E²Series Microprocessor
Controllerthat provides these general features:
• Full alarm system
• Input/output status monitoring
• Full integrated control of cooling
• Multi-system control and remote communica-
tion with building management systems
The E²controlleris mounted inside the unit electric box. User
interaction isthrough a graphic terminal mounted onthe front
ofthe unit. It has a backlit liquid-crystal alphanumeric display
and a set of function keys to navigate through the controller
menus and adjust operating parameters.
Acustomer-provided BMS maybe usedto directlyinterface to
the E²controller. Operating instructions forthe E² controller
are provided in the STULZ E² Series Microprocessor
Controller Operators Manual.Refer to that manual for
detailed instructions on operating the system controller.
1.5 Optional Equipment
1.5.1 Humidifier (Optional)
Mini-Space EC systems may utilize an optional electrode
steam humidifier. The humidifier is factory installed inside
the air conditioner and includes fill and drain valves and
associated piping. Operation ofthe humidifier’s fill and drain
cycles is based onwater conductivityand is maintained bythe
humidifier controller. An operating manual for the humidifier
is provided with the unit under separate cover. Refer to that
manual for detailed information about humidifier operation.
1.5.2 Condensate Pump
An optional condensate pump may be used to remove
condensate from the air conditioner and flush waterfrom the
humidifier. An internal overflow safety switch is wired to the
system controller to automatically shut down the precision
A/C system should an overflow occur.
1.5.3 Smoke Detector
Optionallymounted in the return airstream, a smoke detector
is used to sense the presence of smoke and signal the
controller when a smoke alarm condition exists.
1.5.4 Firestat
Optionally mounted in the return air stream, a fire detector
senses high return airtemperature and signalsthe controller
when a fire alarm condition exists.

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MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
2.0 INSTALLATION
2.1 Receiving the Equipment
Your Mini-Space EC unitwas inspected and testedfordefects
before shipment. To ensure the unit is in excellent condition
when you receive it,visually inspect it upon delivery. Carefully
remove the shipping container and all protective packaging.
Open the access panels/doors and thoroughly inspect the
unit interior for any signs of transit-incurred damage. Ifthere
is shipping damage, it must be noted on the freight carrier’s
delivery forms before signing for the unit. STULZ ships all
systems FOB factory. Any freight claims must be done
through the freight carrier. STULZ can assist in the claim
filing process with the freight carrier. Should any damage be
present, notify the STULZ Product Support Group before
attempting any repairs. Refer to section on page 30 for
instructions.
A “data package” has been sent with your unit. It contains
this manual; an E² controller manual and, optionally, other
component manuals; system drawings; applicable SDS’s;
a unit startup checklist; a warranty registration form; and
other applicable instructions based on the configuration
and options of your unit. The data package has been placed
in your unit in a clear plastic envelope. Its documents should
be retained with the unit for future reference.
NOTE
Items that have been shipped loose, such as
controllers, temperature sensors, water detectors,
etc., are shipped inside the air conditioner unless
specified otherwise by the customer. The duct
connection plate or plenum box (if applicable) are
placed on top of the air conditioner inside the unit’s
carton. Remove and storethese items in a safe place
unless you are using them immediately.
2.2 Site Preparation
Mini-Space EC systems are designedfor easyservice access.
A component access door is located on the front of the
equipment. To maintain full service access through the front
hinged access door, no permanent obstructions should be
placed within 36 inches ofthe front ofthe unit. (See Figure 2).
NOTE
Working clearance requirements need to be
established priorto mounting the unit. Referto local
and national electrical codes.
To minimize the effects of the environment surrounding
the conditioned space, certain steps must be taken. This
is especially true for critical/precision room preparation
(computer rooms/labs) requiring close tolerance control of
temperature and humidity. The conditioned space should be
well insulated and include avapor barrier. The installer should
ensure that the proper insulation rating is used based on
the design of the space, which was the basis for the system
selected. The following chart is a recommended minimum
R-value (thermal resistance) to ensure optimum equipment
operation.
Structure RValue
Ceiling R38
Wall R21
Floor R19
Door R5
The vapor barrieris the single most important requirementfor
maintaining environmental control in the conditioned space.
The vapor barrierin the ceiling and walls can be a polyethylene
film. Concretewalls andfloors should be painted with arubber
or plastic based paint. Doors andwindows should be properly
sealed and a doorsweep used to minimize leakage. Outside or
2.0"
2.0"
36.0"
Figure 2. Installation Clearance

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MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
fresh airshould be keptto a minimum (as it addsto the cooling,
heating, dehumidification and humidifying loads), while
maintaining the requirement of the Indoor Air Quality (IAQ)
standard. Lack of these steps can cause erratic operation,
unstable room control and excessive maintenance costs.
2.3 Rigging
Mini-Space EC systems are designed to be kept vertical.
Move the unit with a suitable device such as a forklift, pallet
jack or roller barand dollies.Aweight table is provided onthe
installation drawing provided withyour unitfor reference.The
Mini-Space EC unit is shipped on a skid to facilitate moving
priorto installation. The unit should always be stored indoors
in a dry location prior to installation.
CAUTION
When moving the unit, it must be kept level and
vertical to prevent damage.
2.4 Mounting/Placement
Mini-Space EC systems that are not ducted are designed to
be located in the conditioned space. Ducted units may be
located either inside or outside the space to be conditioned,
but are designed to supply air to only one room. Mini-Space
EC units have a compact footprint which allows them to
be placed in a corner. It is recommended that the unit be
positioned to obtain optimum air circulation.
Figure 3. Typical Installation
OPTIONAL 2 OR 3 WAY PLENUM BOX
(FIELD INSTALLED)
UPFLOW DOWNFLOW
OPTIONAL FLOOR STAND
OPTIONAL DUCT

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MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
NOTE
Placement of the floor or ceiling registers is
important. Ifthey are too closeto the unit,the supply
air will be recirculated back to the unit before it has
circulated throughout the space.
See Figure 3.The unit is designed to be located on top ofthe
floor(typically upflow) oron a raised floor(typically downflow).
The Mini-Space EC has a frame and panel construction
for unit rigidity and full service accessibility while the unit is
mounted in place. Ensure the mounting surface is capable of
supporting theweight ofthe equipment. Before mountingthe
unit, referto the installation drawingforthe weight ofyour unit.
Ifafloor stand is employed, (described in section 2.5.1, “Floor
Stand” referto the installation drawing provided and cut out
the raised floor to match the unit’s overall base dimension.
If a floor stand is not selected, use the installation drawing
and cut out the raised floor to match the blower discharge
opening and cut out the holes required for piping and wiring
through the raised floor.
CAUTION
Ensure the mounting surface can support the
weight of the equipment. On some raised floor
installations a floor stand is required, depending on
the load capacity of the existing raised floor. Before
mounting the unit, refer to the weight table on the
installation drawing. Equipment must be level to
operate properly.
2.4.1 Outdoor Equipment
Before installing outdoor equipment, referto the installation
manual provided with the equipment. Install the equipment
(remote condenser, fluid cooler, pump package) in a secure
location where it cannot be tampered with and the main
power disconnect switch cannot be inadvertently turned
off. Provide a solid base capable of supporting the weight of
the equipment. Mount the equipment to the base to prevent
it from moving during operation. It is recommended that
outdoor equipment be mounted with vibration isolators to
reduce the vibration transmitted to the mounting surface.
Locate remote condenser/condensing units where the
blower(s) are not likely to draw dirt and debris into the coil
fins. There should be at least 24 inches of clearance around
the condenser to ensure adequate airflow to the coil.
Install a pump package (if applicable) in accordance with the
installation manual and piping diagram provided with the unit.
The pump should be at least 3 feet below the height of the
expansion tank.Do notform pipingloops adjacentto thepump.
Avoid piping very rigid lines.
2.5 Optional Equipment (Field Installed)
NOTE
Do not mount anyoptional equipment on unit access
doors.
2.5.1 Floor Stand
Installthe optionalfloor standdirectly onthe sub-floor,ensuring
the side with the “FRONT” label is facing the same direction
as the front of the unit (see Figure 4). Refer to the floor stand
assemblydrawingforthe dimensions requiredto cutthe raised
floor.The floor stand is designedwith adjustable feet on all the
legs, allowingfor leveling and overall height adjustment. Refer
tothefloorstand assemblydrawingforminimum and maximum
height adjustability ofyourfloor stand.To adjust the height,first
loosen the middle nuts on each leg. Next,turn thetop hex nuts
to raise or lower the floor stand. Once the floor stand is level
andevenwiththe raisedfloor,lock allfeet inplace bytightening
the middle hex nuts against the top hex nuts.
"FRONT" LABEL
THREADED ROD
MIDDLE HEX NUT
TOP HEX NUT
FLOOR STAND LEG
2.5.2 Plenum Box Assembly
If an optional 2- or 3-way air distribution plenum box is
purchased it is typically shipped loose. To install a plenum
box, first apply a strip of sealing foam around the top flange
of the A/C unit or run a bead of silicone sealant. Place the
plenum assembly ontop ofthe unit (see Figure 6). Attach the
plenum with self-tapping screws (customer supplied). Holes
are pre-drilled in the plenum box. Remove the front grille for
access to the mounting holes.
2.5.3 Remote Display
An E² controller is supplied with the Mini-Space EC system.
As an option, afactory supplied control panel may be remote
mounted. For mounting and wiring instructions, refer to the
system drawings and E² controller manual sent in the data
package with your unit.
Figure 4. Optional Floor Stand Installation

8
MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
2.5.4 Condensate Pump
If an optional field-installed condensate pump is included, it
should be located as near as possible to the air conditioning
system. The pump should be positioned so the inlet hole in
the pump is below the drain pan inside the A/C unit. Secure
the pump in place with a mounting clamp or use an adhesive
that is appropriateforthe mounting surface. Ensure the pump
is level for proper operation.
2.5.5 Remote Temperature/Humidity Sensor
The remote temperature/humidity (T/H) sensor must be
located sothat it willproperly sense thetemperature/humidity
conditions to be controlled. The T/H sensor should not be
mounted neara doorway oran area where itwould beexposed
to direct sunlight. When locating the sensor, consider the
length ofwire to be used. As an option, a 75 foot or 150 foot
long cable may be provided by STULZ. Followthe stepsbelow
to mount the sensor.
1. Remove the coverfrom the base ofthe sensor bysqueez-
ing it at the top and bottom.
CAUTION
The sensor can be damaged if handled improperly.
Take care to not touch the sensor as this may affect
its accuracy.
2. Place the basetemporarily againstthe mounting surface.
3. Levelthe base. Mark and drill mounting holes through at
least two of the available slotted holes.
4. Run a three-conductor shielded cable through the
opening in the base, then secure the base with screws
ensuring the word TOP on the PC board is oriented
upward.
5. Make the wiring connections. Refer to section 2.8.3.2
on page 14 and the wiring diagram supplied with your
unit.
6. Seal the hole in the wall behind the sensor.
7. Replace the cover plate on the base.
2.5.6 Remote Water Detector
The remote waterdetectoris normally placed onthe sub floor
or in a field-supplied auxiliary drain pan located beneath the
unit. STULZ provides two types of water detectors, installed
as described below.
Spot-type water detector
Remove the protective cover and connect two control wires
to theterminals on the base (terminal lugs are provided). Place
the water detector(s) on the floor with the metal electrodes
facing down.
The base is provided with a
mounting hole in the center
which may be used to secure
the water detector in place.
Replace the cover. When water
is present, current will flow
between the electrodes.
NOTE
Do not place the spot-type water detector on an
electrically conductive surface.
Cable type water detector
Lay the cable water detector flat across the sub floor where
water could collect. When water is present, current will flow
between the two wires.
A two conductor wire harness is provided with a quick
connect fitting on the end.
The harness mates to the
fitting on the water detector
and connectsit to thecontrol
board inside the electric box.
2.6 Air Distribution Connection
If ductwork is to be installed always consult yourlocal or state
codes. The duct system should be designed to allow the air
to move with as little resistance as possible.
2.6.1 Downflow Configuration Air Patterns
(CCD/CCF)
In a downflow unit the conditioned supply air discharge is
through the bottom of the unit into a raised floor or through
the front door intothe conditioned space. There aretwo basic
return air patterns:top free return andtop ducted return (see
Figure 5).
2.6.2 Upflow Configuration Air Patterns
(CCU/CCR)
In an upflowunit the conditioned supply air hastwo methods
of discharge from the top of the unit: Ducted or through a 2
or 3-way grilled plenum box. There are two basic return air
patterns: Front free return or rear ducted return (see Figure 6).
Unitswith a rear ducted return are providedwith a duct flange
forconnection ofthe ducting (referto the installation drawing
provided with the unit). The connection of the duct to the unit
may be made with either pop rivets or self-tapping screws.

9
MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
2.7 Piping Connections
2.7.1 Refrigerant
2.7.1.1 Self-Contained Systems
No refrigerant connections are required for self-contained,
water/glycol-cooled systems (models CC( )-041/121W/G-
EC) and chilled water systems (models CC( )-110CWEC).
2.7.1.2 Split Systems
Split air-cooled systems with a remote condenser will require
field installed refrigerant piping. All split systems are shipped
with a dry nitrogen charge of 50 psig.
NOTE
Mini-Space EC units are not available in a remote
condensing unit configuration.
Split systems coupled with a remote condenserwill require a
copper discharge line and copper liquid line.The connections
are made outsidethe cabinet. The pipe stubs are labeled; for
example, “Discharge,” “Liquid.” See the installation drawing
for size and location.
All refrigeration piping should be installed with high
temperature soldered joints. Use standard refrigeration
practices for piping supports, leak testing, dehydration and
charging ofthe refrigeration circuits. The refrigeration piping
should be isolated from the building by the use of vibration-
isolating supports. To prevent tube damage when sealing
openings in walls and to reduce vibration transmission, use a
soft flexible material to pack around the tubes.
Clear all pipe connections of debris and prepare the
connections for soldering. Use only“L” or “K”grade refrigerant
copper piping. Be careful notto allow solder/piping debristo
get inside refrigerant lines. Silversolder containing a minimum
of15% silver is recommended. Drynitrogen should beflowing
through the tubing while soldering at a rate of not less than
12 CFM (.03 - .06 m3/minute).
Refrigerant lines for split systems must be sized according
to the piping distance between the evaporator and the
condenser/condensing unit. Eachvalve,fitting and bend in the
refrigerant line must be considered in this calculation. Refer
to the following chart provided for determining the standard
equivalent lengths, in feet, of straight pipe.
When installing remote condenser(s) above the evaporator,
the discharge line should include a shallow P-trap at the
evaporator. The highest point in the discharge line should be
above the condenser coil. An inverted trap is required on the
discharge line at the remote condenser to help prevent oil
and liquid refrigerant from flooding back to the compressor.
Oil traps must be included every 20 feet in the vertical risers
and the refrigerant lines must be sloped ¼ inch for every 10
feet in the horizontal lines to ensure proper oil return to the
compressor.
Refer to the line size charts provided in Table 1 for
recommended line sizing.
*”Equivalent Ft.” listed in Table 1 throughTable 3 accountsfor the linearpipe
length as well as equivalent length of valves, elbows and Tee’s.
NOTE
Vertical runsarebased on atotal rise of30 equivalent
feet. For greater lengths, individual calculations must
be made. Sizes assume the use of single risers;
double risers may be necessary.
Table 1. Equivalent Line Size Chart
Equivalent Length (ft) of Straight Pipe
OD (In.)
Line Size
Globe
Valve
Angle
Valve
90º
Elbow
45º
Elbow
Tee
Line
Tee
Branch
1/2 9.0 5.0 0.9 0.4 0.6 2.0
5/8 12 6.0 1.0 0.5 0.8 2.5
7/8 15 8.0 1.5 0.7 1.0 3.5
1 1/8 22 12 1.8 0.9 1.5 4.5
1 3/8 28 15 2.4 1.2 1.8 6.0
1 5/8 35 17 2.8 1.4 2.0 7.0
2 1/8 45 22 3.9 1.8 3.0 10
2 5/8 51 26 4.6 2.2 3.5 12
3 1/8 65 34 5.5 2.7 4.5 15
3 5/8 80 40 6.5 3.0 5.0 17
Recommended Liquid Line Sizes
(For R410A Refrigerant)
CC() Model No./
Total
BTU Capacity
Receiver to Evaporator (Equivalent Length Ft*)
50’ or less 100’ or less 150’ or less
041 / 12,000 3/8 3/8 3/8
061 / 18,000 3/8 3/8 1/2
081 / 24,000 3/8 1/2 1/2
121 / 36,000 1/2 1/2 1/2
Table 2. Recommended Liquid Line Sizes

10
MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
NON-DUCTED TOP RETURN WITH FRONT AND BOTTOM DISCHARGE
DUCTED TOP RETURN WITH FRONT AND BOTTOM DISCHARGE
TOP FREE RETURN/
BOTTOM DISCHARGE
RETURN
AIR INLET
SUPPLY
AIR OUTLET
TOP DUCTED RETURN/
BOTTOM DISCHARGE
SUPPLY
AIR OUTLET
RETURN
AIR INLET
DUCT
RETURN
AIR INLET
SUPPLY
AIR OUTLET
RETURN
AIR INLET
SUPPLY
AIR OUTLET
DUCT
TOP FREE RETURN/
FRONT DISCHARGE
TOP DUCTED RETURN/
FRONT DISCHARGE
Figure 5. Downflow Configuration Typical Air Patterns

11
MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Figure 6. Upflow Configuration Typical Air Patterns
SUPPLY
AIR OUTLET
RETURN
AIR INLET
SUPPLY
AIR OUTLET
DUCT
RETURN
AIR INLET
REAR DUCTED RETURN
SUPPLY
AIR OUTLET
DUCT
RETURN
AIR INLET
FRONT FREE RETURN
DUCT
RETURN
AIR INLET
SUPPLY
AIR OUTLET
DUCT
TOP DUCTED DISCHARGE
TOP DISCHARGE WITH 2 OR 3 WAY PLENUM BOX
REAR DUCTED RETURNFRONT FREE RETURN

12
MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Consult the Copeland applications data guide for detailed
information regarding refrigerant line traps and line sizing.
2.7.2 Water/Glycol, Chilled Water and Hot
Water Reheat Piping
The piping connections for water/glycol and chilled
water systems are sweat connections. Pipe sizes may not
necessarily be the same size as the unit connection. Piping
should be sized to match the required system pressure drop
and pump capacity (if applicable) and may require reducing
fittings to match the connection size on the air conditioner.
Water/glycol/chilled water-cooled systems with low
entering fluid temperatures should have insulated piping.
The recommended ethylene glycol solution ratio is 40%
glycol to 60% water. (STULZ recommends Dowtherm SR1
manufactured by DowChemical Co.) Use only ethylene glycol
with inhibitors for corrosion protection.
WARNING
Glycol is hazardous. Consult the manufacturer’s SDS
for detailed safety information.
CAUTION
When installing and filling the water/glycol/chilled
waterloop and optional hot waterreheat loop, all air
must be bled from the piping system.
CAUTION
The piping system must beflushed prior to operating
the system. Failure to do so will result in equipment
problems.
Astrainer should be included inthe water/glycol/chilledwater
line. Once the system is operational, thefluid runs through the
strainerwhere anyforeign objects are removed. The strainer
screen should be cleaned periodically.
2.7.3 Pump Package
Install a concentric reducer atthe pump suction and discharge
openings and make all piping at least one (1) size largerthan
the diameterofthe openings. If asuction strainer is necessary,
install one with a net area 2–3 times larger than the suction
piping. The piping leaving the drycooler should enter the
pump suction port. Install a check valve in the discharge line
to prevent back flow that may damage the pump on shut
down. Install a ball valve in the suction and discharge lines
for maintenance purposes.
2.7.4 Condensate Drain Line
2.7.4.1 Gravity Drain
A drain line is installed to drain the condensate pan. If an
optional humidifieris used, the drain linefrom the humidifieris
typically connectedto the condensate drain line.The drain line
is run out of the right side of the cabinet. See the installation
drawing provided with your unit for the size and location of
the condensate drain line.
NOTE
The humidifier drains (hot) waterinto the condensate
drain line during normal operation. As an option,
a separate drain line may be provided for the
humidifier.
The drain line must not be exposedto freezingtemperatures.
The diameter of the drain line should be the full size of the
connection.
NOTE
Pour some water into the condensate drain pan(s)
prior to start-up. This fills the trap and prevents air
from being drawn up the drain lines.
2.7.4.2 Condensate Pump
An optional condensate pump shown in Figure 7 on page
13 is available for automatic removal of condensate from
the air conditioner and flush water from the humidifier. The
condensate pump must be field installed.
AP-trap is installed in the condensate pan drain line, so one is
not requiredforthe condensate pump. The condensate pump
discharge line should be 1/2 inch OD (maximum) copper
pipe to prevent excessive backflowto the condensate pump.
2.7.5 Humidifier
Mini-Space EC systems use an electrode steam humidifier. In
most cases the humidifierempties intothe condensate drain
line during the flush/drain cycle. As an option, the drain for
the humidifier may have a separate connection. Refer to the
installation drawing provided with your unit for the size and
location of the connection.
Table 3. Recommended Discharge Line Sizes
Recommended Discharge Line Sizes
(For R410A Refrigerant)
CC() Model
No./Total
BTU Capacity
Equivalent Length Ft*
50’ or less 100’ or less 150’ or less
041 / 12,000 1/2 1/2 5/8
061 / 18,000 5/8 5/8 5/8
081 / 24,000 5/8 7/8 7/8
121 / 36,000 7/8 7/8 7/8

13
MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
A water supply line for the humidifier must be connected to
the end of the copper tubing provided by the factory. Refer
to the installation drawing providedwith yourunit forthe size
and location ofthe connection. The humidifierrequires normal
tap water for the water supply. If the supply water is high in
particulate, an external filter may be needed.
CAUTION
Do not use demineralized water.
Refer to the humidifier operator’s manual supplied with the
equipment for complete manufacturer’s information on the
humidifier and the supply water recommendations.
2.8 Utility Connections
2.8.1 Main Power
The Mini-Space EC is available in single orthree phase power
in awide range ofvoltages.The unit nameplate (see Figure 8)
lists the operating voltage, frequency and phase of your unit
The nameplate also provides the full load amps (FLA), the
currentthe unit will drawunderfull design load, the minimum
circuit ampacity(MCA) forwire sizing, andthe maximum fuse
or HACR (Heating, Air Conditioning, Refrigeration) breaker
size (MAX FUSE/CKT BKR) for circuit protection. The unit’s
nameplate is located inside the cabinet withinthe electric box.
NOTE
If the nameplate states MAX FUSE/CKT BKR, it
is required to use fuses or an HACR-type circuit
breaker to protect the system. Other protection
devices are not allowed based upon the product
listing.
The unit is provided withterminals forall required field-wiring.
Refer to the electrical drawing supplied with the unit for all
power and control field-wiring. It is important to identify the
options that were purchased with the unit in order to confirm
which field connections are required.
WARNING
Verifypower isturned off before making connections
to the equipment.
NOTE
All wiring must conform to local and national
electrical codes. Only use copperconductors. Wiring
terminations may become loose during transit of
the equipment; therefore, it is required to verify
that all wiring terminations are secure priorto initial
operation.
Figure 7. Condensate Pump
INLET 7/8" OD
OUTLET 1/2" OD
Figure 8. Sample Nameplate

14
MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
CAUTION
Verify facility power to the unit matches the voltage,
phase and frequency specified on the system
nameplate. Supply voltage measured at the unit
must be within ±10% of the voltage specified on
the system nameplate except for 208/230V single-
phase units, which have a different tolerance listed in
the sections to follow.
A main distribution panel must be provided with a manual
fused disconnect switch or HACR-type circuit breaker
per local and national electrical codes for service to the
equipment. Do not mount a customer-supplied manual fused
disconnect switchorHACR-type circuit breakerto thesurface
of the A/C unit.
The unit is provided with a main power pilot hole and a
control wiring pilot hole for connection of field-wiring
conduits. Typically, these pilot holes are located on the side
ofthe Mini-Space EC cabinet.A label stating “MAIN POWER
INPUT” is placed in close proximity.
Terminate the main power wires at the line side of the main
powerdisconnect switch located within the electric box (see
Figure 9). A separate equipment ground lug is provided in the
electric box for terminating the earth ground wire.
The size of the electric box and location of its components
vary according to the Mini-Space EC model. Electric box
components are labeledwith reference designatorswhich are
identified byname on the unit electrical drawing contained in
the data package accompanying the unit.
CAUTION
Prior to unit operation, an adequate unit-to-earth
ground must be connected.
2.8.1.1 Single-Phase Units 208/230V
The supply voltage for units that are designed for 208V
operation must have atolerance within -5% and +10%. Ifthe
measured supplyvoltage is 230V, the unit can operatewith a
tolerance of±5% if thefollowing change is made. The control
transformers within the system must have the primary wire
connected to its respective 240V tap instead ofthe 208Vtap.
2.8.1.2 Three-Phase Units
Three-phase units are designed to have the L1, L2 and
L3 supply wires connected to corresponding L1, L2 and
L3 line terminals of the non-fused main power disconnect
switch. The unit will operate correctly if the supply wires are
connected in this manner. A ground lug is provided in each
unit nearthe non-fused main power disconnect switch. Prior
to unit operation an adequate unit-to-earth ground must be
connected to the unit.
CAUTION
Improper wire connections will result in reverse
rotation of the compressor (if applicable) and may
eventually result in damage to the compressor in DX-
based systems. To correct this problem, exchange
anytwo ofthe incoming main powerwires at the main
power disconnect switch. Do not rewire the unit’s
individual components.
2.8.2 Controls
The E²is the standard controllerfor Mini-Space EC systems.
If the graphic terminal is mounted on the unit (standard),
no utility connection is required. As an option, the graphic
terminal may be factory supplied for remote mounting. A
cable harness is typicallyprovidedforthe interconnectwiring.
Refer to the STULZ E2Series Microprocessor Controller
Operators Manual and the electrical drawing supplied with
your unit for details on connecting the graphic terminal.
2.8.3 Optional Equipment
NOTE
All wiring must be provided in accordance with local
and national electrical codes.
2.8.3.1 Condensate Pump
Systems supplied with a field-installed condensate pump
require power and control wiring to be connected to the
unit. After installing the condensate pump, the installer must
connect two power conductors from the condensate pump
main power terminals to the air conditioning unit. A ground
wire must be connected to the unit ground stud located in
the unit electric box.
Two control conductors must bewired tothe controlterminal
board located in the unit electric box. The control wires from
the terminal board in the electric box should be run through
the overflow switch in the condensate pump housing. The
condensate pump is equipped with pigtail leads for splice-
type wire connections with twist-on connectors (wire caps).
Refer to the electrical schematic supplied with your unit for
proper wire terminations.
2.8.3.2 Remote Temperature/Humidity Sensor
Each remote temperature/humidity sensor requires a
three-conductor shielded cable with the shield being
terminated at the unit electric box. Both the electric box and
the sensor include aterminal strip with box-type lugs forwire
connections.Refertothe electricaldrawing suppliedwithyour
unit for proper wire terminations.

15
MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
2.8.3.3 Remote Water Detector
Each remote waterdetectorwill requirewiring two conductors
to the control terminal board in the unit electric box. The
wire insulation must be rated at 600V. Referto the electrical
drawing supplied with your unit for properwire terminations.
2.8.4 Split Systems
The following system interconnecting field wiring sections
detailthe number ofconductors requiredfor atypical system.
Additional control conductors may be required depending
on the options purchased with the equipment. Refer to the
supplied electrical schematic to determine the total number
of interconnecting conductors required for your system. It is
important to note thatthe control transformer(s) supplied with
the equipment have been sized and selected based uponthe
expected loads for each system.
CAUTION
Do not connect any additional loads to the system
control transformers. Connecting additional loads
to the factory supplied control transformer(s) may
result in overloading the transformer(s).
NOTE
All wiring must be provided in accordance with local
and national electrical codes.
2.8.4.1 Glycol Systems
Systems equipped with a glycol-cooled system/pump
package require field wiring between the glycol unit and
pump package (see Figure 9). The installer must wire two
control conductorsfrom theterminal board in the Mini-Space
EC electric box to the pump package electric box. Refer to
the electrical drawing supplied with your unit forthe number
of field wires needed and appropriate wire terminations for
your system.
2.8.4.2 Remote Condenser
Systems equipped with a remote condenser require field
wiring between the Mini-Space EC unit and the remote
condenser (see Figure 10). Refer to the electrical drawing
supplied with your unit and the wiring diagram supplied with
the condenser (typically located in the condenser electric
box).The installer must provide main powerwiring tothe main
power distribution block located in the remote condenser
control box. A separate equipment ground lug is provided
in the electric box for termination of the earth ground wire.
The installer must also wire control conductors from the
terminal board in the A/C unit to the control terminal board
in the remote condenser electric box. Refer to the electrical
drawing for the correct numberof field wires needed and for
the appropriate wire terminations for your specific unit.
2.9 System Charging Procedures
2.9.1 Water-Water/Glycol Cooled Systems
No field refrigerant charging is required for fluid cooled units.
Observe the following precautions when installing and filling
the water-water/glycol loop:
• Clean the piping system before water or water/
glycol is allowed to flow through the system.
• Mix glycol withwater before it is addedto the sys-
tem. Use onlywater/glycol solutionwith inhibitors
for corrosion protection.
• Bleed all air from the piping system before filling
the water-water/glycol loop.
1. Open a vent valve at the highest point of the system.
2. Fill the system until the solution is discharging from the
ventwith minimal signs offoaming due to airin the system.
2.9.2 Pump
If apump is used, ensure the system is filled before turning the
pump on; ifthe pump is not self-priming, there must be pressure
on the suction inlet.
CAUTION
Do not run the pump when dry.
If the pump has no pressure on the discharge side, leave the
discharge valve partially shut to create a back pressure in the
pump so that liquid can build up inthe impeller housing (to keep
the impeller housing from getting too hot). Make sure there is
always liquidflowing through the pumpto cool the impellerand
housing. If there is no liquid leaving the pump, shut the pump
off immediately to prevent damage to the pump. Check for
proper rotation of the motor, observing the arrow on the side
of the impeller housing.
2.9.3 Remote Air-Cooled Systems
Remote air-cooled systems are provided with a dry nitrogen
holding charge, which must be removed before piping and
charging the unit. Before charging, check the unit nameplate
to confirm the type of refrigerant to use.
NOTE
Refrigerant charging must be performed by aqualified
air conditioning technician.
Mini-Space EC systems use R410A refrigerant. Refrigerants
that are multi-component blends like R410Ahave component
parts with different volatilities that result in a change in
composition and saturation temperature as evaporation
and condensation occur. The composition of liquid R410A
refrigerant however, remains relatively constant.

16
MINI-SPACE EC INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Figure 9. Interconnecting Field Wiring - Glycol Systems
24VAC
(GLYCOL UNITS ONLY)
PUMP PACKAGE
ELECTRIC
BOX
MAIN POWER SUPPLY
208-460V/1PH-3PH/60Hz
DRYCOOLER
L3
L1
L2
2. WIRE CONNECTION POINTS SHOWN IN THE ILLUSTRATION ARE NOTIONAL. POSITION
OF TERMINATION POINTS IN THE CABINET WILL DIFFER FROM THAT SHOWN.
1. PHANTOM WIRES ( ) NOT APPLICABLE FOR SINGLE PHASE POWER SUPPLIES.
NOTES:
INTERCONNECTING FIELD WIRING
(TO BE INSTALLED IN ACCORDANCE
WITH NFPA 70, N.E.C.)
MAIN POWER SUPPLY
208-460V/1PH-3PH/60Hz
MODELS CC()-041/121-W/G
INTERCONNECTING FIELD WIRING
(TO BE INSTALLED IN ACCORDANCE
WITH NFPA 70, N.E.C.)
L3
L1
L2
Figure 10. Interconnecting Field Wiring - Remote Condenser
2. WIRE CONNECTION POINTS SHOWN IN THE ILLUSTRATION ARE NOTIONAL. POSITION
OF TERMINATION POINTS IN THE CABINET WILL DIFFER FROM THAT SHOWN.
1. PHANTOM WIRES ( ) NOT APPLICABLE FOR SINGLE PHASE POWER SUPPLIES.
NOTES:
INTERCONNECTING FIELD WIRING
(TO BE INSTALLED IN ACCORDANCE
WITH NFPA 70, N.E.C.)
MAIN POWER SUPPLY
208-460V/1PH-3PH/60Hz
MODELS CC()-041/121-W/G
L3
L1
L2
AIR COOLED CONDENSER
WITH NFPA 70, N.E.C.)
INTERCONNECTING FIELD WIRING
(TO BE INSTALLED IN ACCORDANCE
24VAC
208-460V/1PH-3PH/60Hz
MAIN POWER SUPPLY
L2
L3
L1