Stulz SCS Series User manual

+
SCS Series
Installation, Operation and Maintenance Manual
Remote Air Cooled Condensers
For Indoor Cooling Systems

SCS Series Condensers
Nomenclature
-SCS-XXX-XXX
SCS
Capacity
(1000
BTU/Hr)
Circuit
s
Fan
Options
SCS Series
Condenser
012
018
024
036
S =
Single
AA - Fan Cycle Control
SA - Variable Speed Control
EC - Variable Speed Control
(Electronically
Commutated Fans)
060
096
120
144
192
S =
Single
D =
Dual
252
276
312
447
525
597
683
940
1366
D =
Dual
SCS Series Micro-Channel Condensers
Nomenclature
SCS-MC-XXX-XXX-XX
Condenser
Section with
Micro-
Channel Coil
015
018
S =
Single
AA - Fan Cycle Control
SA - Variable Speed Control
EC - Variable Speed Control
(Electronically
Commutated Fans)
LN - Low Noise Variable
Speed Control
(Electronically
Commutated Fans)
O - Standard
F - Flooded Head
Pressure
Control with
Receiver
1 - R407C
2 - R410A
031
035
056
071
111
S =
Single D
= Dual
128
142
223
264
334
D = Dual

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 Air
Technology Systems, Inc. Distributing or photocopying this document for external
distribution 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Unpublished — rights reserved under the copyright laws of the United States and of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 of their respective
owners.
Copyright 2017 by STULZ Air Technology Systems, Inc. Printed in the United States
of America.
All rights reserved.
STULZ Air Technology Systems, Inc.
1572 Tilco Drive
Frederick, MD 21704 USA
https://www.stulz-usa.com/en/

-SCS CONDENSER IOM MANUAL
Table of Contents
2.6.1.2 Receiver Heater Wiring .............................................. 14
2.7 System Charging ..........................................................14
1.0 Introduction…………………...…..………………….1
1.1 General................................................................................1
1.2 Product Description........................................................1
1.2.1 Capabilities and Features .............................................1
1.2.1.1 Safety Features................................................................1
1.2.2 Application Ranges.........................................................1
1.3 Safety ..................................................................................2
1.3.1 General................................................................................2
1.3.2 Safety Summary...............................................................2
1.4 General Design.................................................................3
1.4.1 Condenser Coil.................................................................3
1.4.1.1 -SCS Condenser Coils ...................................................3
1.4.1.2 -SCS-MC Micro-Channel Condenser Coils ............3
1.4.2 Fan Assembly....................................................................5
1.4.3 Electric Box .......................................................................5
1.4.4 Receiver (Optional)..........................................................5
1.5 Head Pressure Controls................................................5
1.5.1 Condenser Fan Cycling (AA Models).........................5
1.5.2 Variable Condenser Fan Speed (SA Models)..........5
1.5.3 Flooded Head Pressure Control.................................6
2.0 Installation .....................................................8
2.1 Receiving the Equipment ..............................................8
2.2 Site Preparation ...............................................................8
2.3 Rigging................................................................................8
2.4 Mounting/Placement.....................................................8
2.4.1 Receiver...........................................................................10
2.4.1.1 Head Pressure Control Valve...................................... 10
2.5 Refrigerant Piping ........................................................ 10
2.5.1 Refrigerant Line Sizing................................................10
2.5.1.1 Discharge Line...............................................................11
2.5.1.2 Liquid Line....................................................................... 12
2.5.2 Head Pressure Control Valve Installation (
SCS condenser only) ...................................................12
2.5.3 Receiver Pipe Installation (SCS condenser
only)...................................................................................13
2.6 Utility Connections.......................................................13
2.6.1 Main Power and Control Wiring............................... 13
2.6.1.1 Condenser Enable Feature ....................................... 14
•
2.7.2 Estimating Refrigerant Charge ................................15
2.7.3 Preparing System For Charging...............................17
2.7.4 Refrigerant Charging Procedures...........................18
2.7.4.1 0 ºF Fan Cycling and -20 ºF Variable Speed
Control..............................................................................18
2.7.4.2 -30 °F Flooded HeadPressure Control................19
2.7.4.2.1 Checking the Charge...................................................19
2.7.4.2.2 Final Adjustment ...........................................................20
2.8 Refrigerant Characteristics.......................................20
2.8.1 Pressure/Temperature Settings ..............................20
2.8.2 Saturated Refrigerant Pressure Tables....................20
3.0 Start-Up/Commissioning............................ 21
3.1 Operation ........................................................................21
3.2 Step by Step Start-Up Instructions.........................21
3.3 Operational Description .............................................21
4.0 Maintenance/Repairs.................................. 22
4.1 Periodic General Maintenance................................. 22
4.1.1 General.............................................................................22
4.2 Field Service...................................................................23
4.2.1 Leak Detection..............................................................23
4.2.2 Leak Repair ....................................................................23
4.2.3 Refrigerant Piping ........................................................23
4.2.4 Electrical System ..........................................................23
4.3 Troubleshooting............................................................ 23
5.0 Product Support .......................................... 25
5.1 Technical Support.........................................................25
5.2 Obtaining Warranty Parts...........................................25
5.3 Obtaining Spare/Replacement Parts .................... 25

SCS
CONDENSER IOM MANUAL
Tables
Table 1. Fan Cycling PressureControl Settings ............. 6
Table 2. Variable Fan SpeedControl Settings................. 6
Table 3. Pipe Equivalent Lengths..................................... 11
Table 4. Pressure Drops...................................................... 12
Table 5. -SCS Condenser Refrigerant Charge
Weights (lb) ............................................................. 15
Table 6. -SCS-MC Condenser Refrigerant Charge
Weights (lb) ............................................................. 16
Table 7. Weight of Refrigerant (lb/100 ft of Type L
Tubing).................................................................................16
Table 8. Refrigerant Pressure/Temperature
Settings .................................................................... 20
Figures
Figure 1. Typical Layout- SCS Condenser ........................ 4
Figure 2. Typical Layout- SCS-MC Condenser ................ 4
Figure 3. Flooded Head Pressure Control Diagram....... 7
Figure 4. Ground Mounting .....................................................9
Figure 5. Side Clearance..........................................................9
Figure 6. Walled Areas or Pits ............................................. 10
Figure 7. Receiver Assembly ............................................... 10
Figure 8. Piping Installation.................................................. 12
Figure 9. Dual Riser Piping................................................... 12
Figure 10. Field Wiring ............................................................. 13
Figure 11. Sample Nameplate ............................................... 14
iv

SCS
CONDENSER IOM MANUAL
1
1.0 INTRODUCTION
1.1 General
The Remote Air Cooled Condenser is designed and
manufactured by STULZ. Recognized as a world leader, STULZ
provides precision cooling systems with the highest quality
craftsmanship using the finest materials available in the
industry. 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 thewarranty.
This manual contains information for installation, operation,
maintenance, troubleshooting and repair. Study the
instructions contained 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 to continue
operation is not recommended and will void the warranty. Due to
technological advancements, components are subject to
change without notice.
STULZ Air Cooled Condensers are designed to reject heat from
refrigerant based cooling equipment. Any use beyond this is
deemed to be not intended. STULZ is not liable for any damage
resulting from improper use. The unit is designed to be installed
outdoors unless otherwise noted on the equipment nameplate.
1.2 Product Description
STULZ Remote Air Cooled Condensers are designed to be the
most efficient and reliable condensers in the industry. The unit
is an air-cooled, heat rejection condenser with a vertical air
discharge pattern.
The unit is self-contained in a light weight, corrosion resistant
aluminum cabinet designed for mounting to a horizontal
surface. The cabinet houses the condenser coil(s) and fan
assembly(s). The electrical controls are in an integrally mounted,
weather proof enclosure which is isolated from the rest of the
equipment.
There are many cabinet sizes based on the capacity of the unit.
Refer to the installation drawing supplied with your unit for the
layout and dimensions of your cabinet.
-SCS condensers are highly efficient heat rejection systems.
Enhanced performance -SCS-MC condensers are also
available. -SCS-MC condensers are equipped with micro-
channel coils which offer greater refrigerant-to-air heat
transfer. The total heat rejection in BTU/hr will depend on the
unit size. Refer to the unit nameplate to identify the model
number of your unit. The system will consist of
a single refrigeration circuit or dual circuit coil. The coil is a
closed-loop refrigerant condensing heat exchanger in
which refrigerant is continuously circulated by the pressure
differential created by a compressor.
The compressor increases refrigerant pressure to a level
sufficiently high for it to be cooled and condensed into
liquid by the effect of ambient air being drawn over the
condenser coil. STULZ condensers are designed to
operate with either R407C or R410A refrigerant. Refer to
the unit nameplate to identify the type of refrigerant to be
used in your unit.
Outdoor air cooled condensers use fan cycling for low
ambient head pressure control down to 0 °F (OHS only).
Variable fan speed control is used for operation in low
ambient temperatures down to -20 °F. Flooded head
pressure control is used with fan cycling for low ambient
temperatures down to -30°F.
Operationofthe condenseris independent,controlledbythe
refrigerant pressure. It can bewired in the field forthe system
controller (provided with the indoor evaporator section) to
enable condenser operation.
1.2.1 Capabilities and Features
•All aluminum cabinet construction
•Mounting legs
•Direct driven axial fan(s) equipped with
external rotor motors
•Unit mounted,weather resistant controlenclosure
with lockable service disconnect switch
1.2.1.1 Safety Features
The remote air-cooled condenser is provided with a
factory mounted service disconnect switch. The service
disconnectswitch electrically isolatesthe unitduringroutine
maintenance. The handle of the switch may be locked in the
“Off” position to prevent unauthorized operation. Finger
guard grilles are provided on each fan to protectthe operator
from injury and to keep large tools or other objects from
falling into the fan.
1.2.2 Application Ranges
STULZ remote air cooled condensers are designed for
operation within the following ranges.
Outdoor Temperature Range
Fixed Fan Cycling
Control (OHS only)
0 ºF or higher
Variable Fan Speed
Control
-20 ºF orhigher
Flooded Head
Pressure Control
-30 ºF or higher

-SCS CONDENSER IOM MANUAL
2
Operating Voltage
VAC Input per unit
nameplate
+/- 10%.
Max. Piping Length;
Indoor Evaporator
to Condenser
150 ft equivalent
length
Max. Level Drop;
Indoor Evaporator
to Condenser
20 ft (if condenser is
below the
evaporator)
Storage Conditions
-30 ºF to 105 ºF
NOTE:Damage or malfunction to the unit due to storage or
operationoutsideofthese rangeswillVOIDTHE
WARRANTY.
1.3 Safety
1.3.1 General
STULZ Air Technology Systems, Inc. uses NOTES
along with CAUTION and WARNING symbols
throughout this manual to draw your attention to
important operational and safety information.
A bold text NOTE marks a short message in the
information to alert you to an important detail.
A bold text CAUTION safety alert appears with
information that is important for protecting your
equipment and performance. Be especially careful to
read and follow all cautions that apply to your
application.
A bold text WARNING safety alert appears with
information that is important for protecting you from
harm and the equipment from damage. Pay very close
attention to all warnings that apply to your application.
A safety alert symbol accompanies a general
WARNING or CAUTION safety statement.
A safety alert symbol accompanies an electrical
shock hazard WARNING or CAUTION safety
statement.
1.3.2 Safety Summary
The following statements are general guidelines
followed by warnings and cautions applicable
throughout the manual.
Prior to performing any installation, operation,
maintenance or troubleshooting procedure read and
understand all instructions, recommendations and
guidelines contained within this manual.
CAUTIONS
All maintenance and/or repairs must be performed by a
journeyman, refrigeration mechanic or an air conditioning technician.
Never lift any component over 35 pounds without help. If a
lifting device is used to move a unit, ensure it can support the
unit.
Do not allow the unit to swing while suspended fromalifting
device. Failure to observe this warning may result in injury to
personnel and damage to the equipment.
Do not allow anyone under the equipment suspended from
a lifting sling.
Never work on electrical equipment unless another person
who is familiar with the operation and hazards of the
equipment and competent in administering first aid is nearby
When working on electrical equipment, remove all jewelry,
watches, rings, etc. Keep one hand away fromtheequipment
to reducethe hazard ofcurrent flowing through vital organs of
thebody.
Always disconnect the main power supply to the equipment
at the main power disconnect switch before beginning work
on the equipment. A lock- out tag-out procedure should be
followed to ensure that power is not inadvertently
reconnected.
All personnel working on or near equipment should be
familiar with hazards associated with electrical maintenance.
Safety placards/stickers have been placed on the unit to call
attention to all personal and equipment damage hazard
areas.
Ensure the unit is properly phased. Improper phasing can
cause severe damage to the compressor.
Certain maintenance or cleaning procedures may call for the
use and handling of chemicals, solvents, or cleansers.
Always refer to the manufacturer’s material Safety Data
Sheet (SDS) prior to using these materials. Clean parts in a
well-ventilated area. Avoid inhalation of solvent fumes and
prolonged exposure of skin to cleaning solvents. Wash
exposed skin thoroughly after contact with solvents.
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.
WARNINGS
High voltage is used in the operation of this equipment.
Death on contact may result if personnel fail to observe
safety precautions.
Equipment may contain components subject to Electrostatic
Discharge (ESD). Before attempting to mount or service
these electronic devices, ensure you have no charge built
up by touching a ground source. When possible, use a
wrist- grounding strap when working on or near electronic
devices.

SCS
CONDENSER IOM MANUAL
3
Refrigerant (R407C or 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 low temperature 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 component
will cause extreme pressure and may result in a rupture.
Exposure of refrigerant to an open flame or a very hot surface
will cause a chemical reaction that will form carbonyl chloride
(hydrochloric/hydrofluoric acid); a highly poisonous and
corrosive gas commonly referred to as FLUOROPHOSGENE.
In its natural state, refrigerant is a colorless, odorless vapor
with no toxic characteristics. It is heavier than air and will
disperse rapidly in a well-ventilated area. In an unventilated
area, it presents a danger of suffocation.
Always refer to the manufacturer’s MSDS provided with the
unit.
Avoid skin contact or inhaling fumes from any acid formed by
burn out of oil and refrigerant. Wear gas mask if area is not
thoroughly ventilated. Wear protective goggles or glasses to
protect eyes.Wear rubber gloves to protect hands. Use care
to avoid spilling compressor burnout sludge. If sludge is
spilled, clean area thoroughly.
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 (.03 - .06 M³/minute).
1.4 General Design
STULZ SCS series remote air cooled condensers are housed
in an aluminum frame cabinet and are rated for outdoor use.
The figures that follow depict the two types of condensers and
identifies the major components. Figure 1 depicts a layout of
atypical-SCScondenser.Figure2depictsalayoutof atypical
-SCS-MC condenser.
1.4.1 Condenser Coil
The capacity of the condenser, indicated by the unit model
number, is based on the rated capacity of the coil. In the case
of dual circuit units, the model number is based on the
combined capacity of both coils.
1.4.2 -SCS Condenser Coils
-SCS condenser coils are copper tube, aluminum finned
coils.
1.4.3 -SCS-MC Micro-Channel Condenser Coils
-SCS-MC condenser coils are brazed all-aluminum
construction with high performance fins which provide
improved airflow and higher heattransfer.

-SCS CONDENSER IOM MANUAL
4
Figure 1. Typical Layout- -SCS Condenser
Figure 2. Typical Layout- -SCS-MC Condenser

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CONDENSER IOM MANUAL
5
1.4.2 Fan Assembly
The condenser is equipped with high efficiency axial type,
impeller fan(s) rated for outdoor applications. The quantity of
fans vary depending upon the capacity of the unit. The fan(s)
use corrosion resistant, multi-blade impellers designed for
high aerodynamic efficiency which results in lower power
consumption, lower noise levels and longer life. Each fan uses a
direct driven motor with maintenance free bearings. The fan
motors are internally protected fromoverload.
1.4.3 Electric Box
Theelectrical componentsareprotected in a weatherresistant
enclosurelocated attheheader end oftheunit.Theelectric box
has a removable front access panel which is safety interlocked
with the service disconnect switch, preventing the panel from
being removed when the switch is in the “On” position. The
switch must be turned “Off” to gain access to the electrical
components.
1.4.4 Receiver (Optional)
Receivers are furnished for air cooled condensers using
flooded head pressure control for low ambient temperature
conditions. The optional receivers are equipped with pressure
relief valves and heaterpads.
Receivers for SCS condensers are mounted to a coated steel
base frame which may be attached to a suitable foundation
next to the condenser (see Figure 7). A head pressure control
valve may be shipped loose for field installation to the receiver
if one is not already provided in the indoorA/C unit.
TheSTULZ SCS-MC condenserdesigndiffersinthatreceivers
are integrally mounted to the condenser Frame (See Figure 2).
For-30 °F applicationsa head pressure controlvalveisfactory
installed and piped to thereceiver.
1.5 Head Pressure Controls
1.5.1 Condenser Fan Cycling (AA Models)
Used for outdoor installations where ambient condenser air
inlet temperatures are 0 °F or higher, a condenser fan cycling
switch monitors refrigerant discharge pressure and turns on
the condenserfan as requiredto maintain allowable condenser
pressures. This is a high-pressure differential control switch
with SPST contacts and an automatic reset. The switch
activates the condenserfan contactor to maintain condensing
temperature when the discharge pressure rises. See Table 1
on page 6 for the fan cycling pressure control settings.
NOTE: It may be necessary to alter the fan cycling control
settings on a case by case basis. This is due, in part, to site
specific heat loads and varying BTU capacities of indoor
evaporator (A/C) units. Contact STULZ Product Support for
assistance.
On single circuit condensers, each fan is controlled with its
own fan cycling switch. Multiple fans are staged to operate
sequentially as discharge pressure rises. The primary fan
(closest to the header) turns on 1st as described above. If
pressure continues to rise, adjacent fan(s) are set to turn on
in sequential increments with the fan located furthest from
the headerturning on last. Conversely, as discharge pressure
drops, the fans drop out sequentially in reverse order. .
Dual Circuit condensers employ a fan cycling pressure
control switch for each refrigeration circuit. For smaller model
condensers, two control switches (one per refrigeration
circuit) are adjusted to the same pressure setpoint and are
wired in parallelto operate a single fan. If either control switch
senses a rise in pressure, the fan will turn on. On dual circuit
units with multiple fans, operation of each additional fan
requires two paralleled pressure control switches (one for
each refrigeration circuit). Each set of paralleled switches
will be set to the same pressure such that the adjacent fans
begin operating at sequentially higher pressureincrements.
For larger model micro-channel condensers (SCS-MC-111
through SCS-MC-334) the fan cycling pressure control
switches are not in parallel. The control switches operate the
fan(s) assigned to each refrigeration circuit independently.
1.5.2 Variable Condenser Fan Speed
(SA Models)
Used for outdoor installations where ambient condenser air
inlet temperatures may fall to -20°F, a variable speed
condenser fan motor controller is used to maintain head
pressure. The fan speed control is a continual modulation of
the motor’s speed. The condenser fan speed controller
monitors the refrigerant discharge pressure and as discharge
pressure rises, the fan speed increases. The condenser fan
speed varies as required to maintain allowable condenser
pressures. The fan speed controller is set to maintain the
correct condensing pressure. SeeTable 2 forthe variable fan
speed pressure control settings.
When used on systemswith multiple condenserfans,variable
fan speed control is used only on the first fan which is closest
to the header. Additional fans use pressurefan cycling control
as described in Section 1.5.1, to assistthe variable speed fan
to maintain proper head pressure.

-SCS CONDENSER IOM MANUAL
6
Table 1. Fan Cycling Pressure Control Settings
Refrigerant
Type
1st Fan
2nd Fan
3rd Fan
4th Fan
Cut-in Cut-out Cut-in Cut-out Cut-in Cut-out Cut-in Cut-out
R407C 320 psig 240 psig 330 psig 250 psig 340 psig 260 psig 345 psig 265 psig
R410A
440 psig
330 psig
460 psig
345 psig
475 psig
355 psig
485 psig
375 psig
Table 2. Variable Fan Speed Control Settings
Refrigerant
Type
1st Fan (Variable)
2nd Fan
3rd Fan
4th Fan
Range (psig)
Min. Max. Cut-in Cut-out Cut-in Cut-out Cut-in Cut-out
R407C 240 315 325 psig 255 psig 340 psig 260 psig 345 psig 265 psig
R410A
340 440
460 psig
355 psig
475 psig
365 psig
485 psig
375 psig
1.5.3 Flooded Head Pressure Control
Used for outdoor installations where ambient condenser air inlet temperatures may fall to -30°F, flooded head pressure
control is used to maintain head pressure during the low ambient temperature conditions. A head pressure control valve
and a receiver are used in the refrigeration circuit to back up liquid refrigerant into the condenser coil. The head pressure
control valve is a 3-way modulating valve controlled by the discharge pressure (see Figure 3). The head pressure control
valve and the receiver may be located with the RCU or with the indoor evaporator unit.
When the A/C unit begins to operate, the discharge pressure rises. When the pressure reaches the “1st Fan” pressure
control setting (Table 1), the condenser fan is cycled on as described in 1.5.1. If multiple fans are used, they will operate
by pressure fan cycling.
When ambient temperature drops, the discharge pressure drops also. When the discharge pressure drops, the head
pressure control valve diverts discharge gas away from the condenser to the receiver. Liquid flow from the condenser
is restricted, causing liquid to back up in thecondenser.
Flooding the condenser reduces the area available for condensing. The desired result is to increase the pressure into
the condenser, maintaining a minimum discharge pressure during low ambient operation thus ensuring proper
condensing temperature. The head pressure control valve requires no adjustment.
This method of controlling head pressure allows the condenser fan to run continuously. While the fan is running, the
flooded head pressure control valve modulates the amount of discharge gas entering the receiver. As the pressure
increases,thevalve diverts more discharge gas to the condenser, allowing more liquid to flow from the condenser to the
receiver.
When using this method of head pressure regulation there must be enough refrigerant in the system to ensure an
adequate charge at the lowest expected ambient temperature in which the system will be operating. A receiver is used to
store the extra refrigerant when the condenser is not utilizingit.

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CONDENSER IOM MANUAL
7
Figure 3. Flooded Head Pressure Control Diagram

-SCS CONDENSER IOM MANUAL
8
2.0 INSTALLATION
2.1 Receiving the Equipment
Yoursystemhasbeen tested and inspectedpriortoshipment.
To ensure that your equipment is received in excellent
condition, make a visual inspection of the equipment
immediately upon delivery. Carefully remove the shipping
container and all protective packaging. Open the electric
box and thoroughly inspect the unit for any signs of transit-
incurred damage. If there is shipping damage, it must be
noted on the freight carrier’s delivery forms before signing
for the equipment. Any freight claims must be done through
the freight carrier.
STULZ ships all equipment FOB factory. STULZ is notliable
for any equipment damage while in transit. STULZ can assist
in the claim filing process with the freight carrier. Should any
damage be present, notify STULZ Product Support prior to
attempting any repairs. Refer to Section 5.0of this manual for
instructions.
Check the equipment against the packing slip to see if the
shipment is complete. Report any discrepancies to the
appropriate authority.
A Data Package has been sent with your unit. It contains this
manual, system drawings, applicable SDS’s and other
appropriate instructions based on the configuration of
your unit and options selected. The data package has been
shippedwithyourunit in aclearplasticbag.These documents
need to be kept with the unit for future reference.
2.2 Site Preparation
Our Air Cooled Condensers are designed with easy service
access in mind. Install the condenser in a secure location
where it cannot be tampered with and the main power
disconnect switch cannot be inadvertently turned Off. Allow
access to the unit for routine operation, servicing and for
necessary maintenance. The components on outdoor
condensersareaccessedthroughthetopby removingthefan
assembly panel.
The electric box is accessed at the header end of the unit.
Locate the unit where the fan(s) are not likely to draw dirt and
debris into the coil fins. Refer to the installation drawing
provided with your unit forthe dimensions.
NOTE: Working clearance requirements need to be
established prior to mounting the unit. Refer to local and
national electrical codes.
CAUTION
The condenser must be kept level to operate properly.
2.3 Rigging
The unit must be lifted vertically and kept in a level position.
Move the unit with a suitable device such as a forklift or
attach an overhead lifting sling. The unit may be lifted with an
overhead sling attached to the top of the mounting support
legs. Use an appropriate lifting device that has the capacity
to safely handle the weight of the equipment. A weight table
is provided ontheinstallation drawing suppliedwithyourunit.
If using an overhead lifting device, use spreader bars that
exceed the cabinet width to avoid crushing the sides of the
unit.
Remote condensers are shipped on a skid to facilitate
moving prior to installation. The unit should always be stored
in a dry location prior to installation. To prevent damage
when lifting the unit, all available lifting eyes on the cabinet
must be used.
CAUTION
Ensure the mounting legs are fully extended when the unit
is raised.
CAUTION
Take care not to damage the exposed coil fins on the
undersideofthe cabinet when moving theunit.
2.4 Mounting and Placement
Outdoor, air cooled condensers are designed for mounting
to a flat surface. Condenser(s) must not be near steam, hot
air or fume exhausts. Avoid overhead obstructions. Ensure
the unit is not located above or near noisesensitive areas. If
possible,makeuseofterrainfeatures

SCS
CONDENSER IOM MANUAL
9
such as trees and buildings to provide a shaded location. This will minimize the solar load on the unit. Avoid ground level
sites that are accessible to the public.
Ensure the mounting location can support the weight of the equipment. Refer to the installation drawing for the non-
charged system weight.
When installing the unit on a roof, ensure the weight is adequately distributed to the load bearing points. For ground
mounted units, install a concrete slab as shown in Figure 4. The slab should extend below the frost line and be at least 2
inches higher than the surrounding grade. The slab should extend at least 2 inches beyond the outer profile of the
condenser on all sides.
Ensure the condenser legs are fully extended to optimize air flow. Secure the unit with fasteners (field supplied by
others) to prevent the systemfrom movingduring operation.Toreducethevibrationtransmissiontothe mountingsurface itis
recommended that vibration isolators (field supplied by others) be inserted between the mounting rails and the base as
shown in Figure 4.
Figure 4. Ground Mounting
The clearance around the unit to the nearest wall or
obstruction should be at least 1 time’s (1×) the unit’s width
to ensure adequate airflow to the coil(s) (see Figure 5 and
Figure 6). Space multiple units at least 2 times (2×) the
unit’s width when placing them side by side. Ensure hot
exhaust air is not directedtoward the air inlet ofan adjacent
unit. When placing units end to end, allow at least 4 feet of
space between units. Avoid areas where heavy snow will
accumulate at air inletand outlet openings.
If the unit(s) are surrounded by three walls or if they are in a
pit, space them at least 2 times (2×) the unit’s width from
the nearest walls (see Figure 6). The top of the unit must
be equal to the height ofthe walls orthe pit. A stack may be
used, if necessary, to extend the air discharge. The height
of the extension must not exceed 10 feet.
Figure 5. Side Clearance
MOUNTING STUD
VIBRATION
PAD
PIPE
SUPPORT
STAND
FLAT WASHER
MOUNTING
RAIL
1 FT.
MAX
HEX NUT
HEX NUT
LOCK WASHER
FLAT WASHER
BUSHING

-SCS CONDENSER IOM MANUAL
10
STACK AIR
FLOW
10 FT. MAX.
outlet pipeswithin onefoot of the condenserheaderto prevent
undue stress on soldered connections (see Figure 4). The
refrigerant piping should be isolated by vibration isolating
supports. Provide supports (clamps or hangers) as
necessary every 5 to 10 feet along piping runs to minimize
2x
WIDTH
2x
WIDTH vibration and noise transmission. When sealing openings in
walls use a soft flexible material to pack around the piping
20” MINIMUM
Figure 6. Walled Areas or Pits
2.4.1 Receiver
Receivers are provided as an option for systems utilizing
floodedhead pressurecontrol.Receivers forSCScondensers
are provided on a separate mounting base frame. Position
optional SCS receiver(s) as close as possible to the
condenser inlet/outlet pipe stubs. Secure the receiver base
frameto the foundationusing the mounting holes in thebase.
(Receivers for SCS-MC condensers are factory mounted to
the condenser frame.)
Figure 7. Receiver Assembly
2.4.1.1 Head Pressure Control Valve
For SCS condensers, the head pressure controlvalve (HPCV)
is shipped loose for field installation. The head pressure
control valve is to be located at the condenser and brazed
in line with the piping between the condenser and receiver.
Refer to section 2.5.2. For SCS-MC condensers, the HPCV
is factory piped to thereceiver.
2.5 Refrigerant Piping
Split air cooled systems require a field installed copper
discharge line and copper liquid line between the condenser
and the evaporator. Dual circuited condensers will require two
sets of piping. Refer to the refrigeration diagram provided
with your unit for pipingdetails.
Provide a permanent stand or support brace for the inlet/
to reduce vibration transmission and prevent pipe damage.
All refrigerantpipingshouldbe installed with high temperature
soldered joints. Use standard refrigeration practices for
piping supports, leak testing, dehydration and charging of
the refrigeration circuits.
NOTE: Refer to the Copeland Applications Data Guide for
more detailed information regarding installation of
refrigerant piping.
The condenser is shipped with a dry nitrogen holding charge
which must be removed before piping and charging the
system. All refrigeration piping should be installed with
high temperature brazed joints. Use standard refrigeration
practices for piping, leaktesting, dehydration and charging of
the refrigerationcircuits. For copperto copperbrazing(piping
liquid line or discharge line), phosphorous alloy containing a
minimum of 15% silver is recommended. General purpose
silver brazing alloy with 45% silver is recommended for brazing
dissimilar metals.
Wrap wet rags around the pipes between the areas to be
soldered and any nearby refrigeration components (such as
the optional head pressure control valve) to keep excessive
heat from traveling through the pipe and causing damage.
Clear all pipe connections of debris and prep connections for
soldering. Use only “L” or “K” grade refrigerant copper
piping. Be careful not to allow solder/piping debris to get
inside refrigerant lines. Drynitrogen should beflowingthrough
the tubing while soldering at a rate of not less than 1–2 CFM
(0.03–0.6 M3/minute).
2.5.1 Refrigerant Line Sizing
The following general guidelines may be used to assist in
determining the size of the refrigerant lines between the
evaporator section and the remote air cooled condenser.
NOTE: Refrigerant piping between the indoor evaporator
and condenser must not exceed 150 feet (total equivalent
length). The maximum level drop from the indoor evaporator
to the condenser must not exceed 20 feet.
Refrigerant lines for split systems must be sized according
to the piping distance between the evaporator and the

SCS
CONDENSER IOM MANUAL
11
condenser with consideration to elevation changes. Each
valve, fitting and bend in the refrigerant line must also be
considered in this calculation. Refer to Table 3 for standard
equivalent lengths, in feet, of straight pipe.
Table 3. Pipe Equivalent Lengths
Refer to the installation manual provided with the A/C system for
tables showing the recommended liquid line and discharge line
sizes for the A/C system you are installing.
Things to consider when sizing refrigerant piping are the varying
BTU capacities of indoor evaporators and the equivalent length
of pipe needed between the remote condenser and the
evaporator.
If the pressure drop is too high, the capacity of the compressor
decreases, and the power required increases. An excessive
refrigerant charge will be applied if the volume of the piping is too
large. Refrigerant line sizing for discharge and liquid lines should
create no more than a 2–3 °F pressure drop (1 °F = 4.75 psi).
NOTE: The size of the condenser pipe connections does not
indicate the size of the refrigerant lines to be used. In cases where
the pipe size doesn’t match the size of the connection, reducing
fittings must be used to transition between the connection and
the pipe.
2.5.1.1 Discharge Line
Since refrigerant may condense during “Off” cycles, all vertical
discharge risers should be designed to prevent liquid
refrigerant from flowing back into the compressor. If a
condenser is installed above the evaporator, the discharge line
should include a shallow P-trap at the lowest point in the piping
(see Figure 8).
The highest point in the discharge line should be above the
condenser coil. Install an inverted trap at the condenser inlet to
prevent liquid refrigerant from flowing backwards into the hot
gas riser during off cycles. Shallow P-traps must be included in
the discharge line for every 20 feet of verticalrise.All horizontal
refrigerant lines should be pitched in the direction of flow at
least 1/4” per 10 feet.
Discharge line velocities must be a minimum of 500 fpm for
horizontal runs and 1,000 fpm for vertical risers to ensure oil is
returned to the compressor at both full and partial load
operating conditions.
It’s important that the discharge line is sized with a certain
degree of pressure drop. This will ensurethe refrigerantflows at
a velocity high enough for the refrigerant vapor to carry the oil
with it to the condenser and to prevent the oil from returning to
the compressor.
Compressor discharge pressure is always higher than
condensing pressure due to the line pressure drop. The line
pressure drop also causes a change in the refrigerant saturation
temperature. The discharge line needs to be sized so the
pressuredropwon’t cause a corresponding changein saturation
temperature exceeding 2 °F.
Discharge piping is typically sized for a total line pressure drop
of5 psi (+/- 50%), which results in only a 1/2% to 1% reduction
in compressor capacity. Pressure drops greater than 10 psi will
impair systemperformance.
Figure 8 depicts a typical piping diagram when the condenser is
located at a higher level than the indoor evaporator. In this
situation, it’s especially important to size the discharge line
properly. If the discharge line is sized correctly for full load
operation, the velocity of the gas may be too low during
minimum load conditions to carry the refrigerant oil vertically
throughthe discharge lineto the condensercoil.
Decreasing the size of the discharge line will increase the
refrigerant velocity, however, it will also restrict the flow of
refrigerant at full load conditions creating an excessive
refrigerant pressure drop.
To remedy this, dual risers may be used as shown in Figure 9
Discharge riser #1 should be sized to allow the refrigerant gas to
flow at a sufficient velocity during minimum load conditions to
carry the oil.
Riser #2 should be sized in such way that the inside diameter of
riser #1 and #2 will together have a combined area allowing for
a flow velocity that’s suitable to carry the refrigerant oil to the
condenser during peak load conditions.
Use a trap between the 2 risers so riser #2 will be sealed off
when the trap fills with oil during partial load operation, thus
diverting the flow of refrigerant to riser #1.
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 0.62.0
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

-SCS CONDENSER IOM MANUAL
12
Figure 8. Piping Installation
Figure 9. Dual Riser Piping
2.5.1.2 Liquid Line
The velocity of refrigerant in the liquid line is less
critical because liquid refrigerant and oil are mixed
thoroughly in the liquid state. The main concern when
sizing the liquid line is to maintain a solid head of liquid
refrigerant entering the thermostatic expansion valve
(TXV). If the refrigerant pressure falls below its
saturation temperature, a portion of the liquid
refrigerant may change into vapor. Vapor will cause
flashing and prevent the TXV from functioning
properly. As flashing begins, the rate of pressure loss
increases.
The liquid refrigerant is sub-cooled slightly below
its saturation temperature. Sub-cooling must be
sufficient to allow the necessary pressure drop
without approaching a saturation condition where gas
flashing could occur. Under normal operation the
refrigerant is sufficiently cooled as it leaves the
condenser to allow for normal line pressure drops.
Liquid line size is to be selected based on a pressure
drop equivalent to 2 °F sub-cooling.
Operating liquid line velocities should be less than 300
fpm to avoid liquid hammering during solenoid
operation.
If the condenser is installed below the evaporator
section, the installer must observe the pressure
changes that occur if the elevation change. SeeTable 4
that follows for the vertical pressure drops for the two
types of refrigerant used.
Table 4. Pressure Drops
Refrigerant Type Pressure Drop
in PSI/ft
(Risers)
R407C
0.47
R410A
0.43
NOTE: When a receiver is used with the equipment, it
should be below the level of the condenser. The liquid
linefromthecondensertothereceivershould be liberally
sized to allow the refrigerant to freely flow from the
condenser to the receiver. The total refrigerant line
pressure drop must not exceed 14 psig across the
condenser and the interconnecting piping to the
evaporator and condenser sections.
2.5.2 Head Pressure ControlValve
Installation (SCS condenser only)
Refer to the refrigeration diagram provided with your
unit and see Figure 3 for details on piping the head
pressure control valve to the condenser andreceiver.
TRAP IN BOTTOM OF COLUMN
WITH MINIMUM TRAP DEPTH POSSIBLE
AIR
RISER #2
RISER #1
PITCH IN DIRECTION OF REFRIGERANT FLOW
TRAP EVERY 20 FEET WITH MINIMUM TRAP
DEPTH POSSIBLE
LINE
DISCHARGE
LINE(S)
CONDENSER
PITCH 1/4 FOR EVERY 10 FEET OF RUN
PITCH IN DIRECTION OF REFRIGERANT FLOW
(DISCHARGE & LIQUID LINES)
INVERTED TRAP

SCS
CONDENSER IOM MANUAL
13
2.5.3 Receiver Pipe Installation
(SCS condenser only)
Receiver inlets and outlets are equipped with RotoLock
valves that must have brazed pipe connections. It is
important to remove the valve from the adapter on the
receiver before brazing the refrigerant piping to it. Wrap wet
rags around the valve bodyto prevent the internal parts from
being damaged by the heat.
After brazing the pipe to the valve, remove and replace the
Teflon O-ring in the RotoLock adapter with the new one
which is cable-tied to the valve. When re-attaching the valve
to the receiver, apply thread lock to the adapter threads to
prevent it from vibrating loose. Tighten the valve to the
receiver and check it for leaks when performing the steps in
2.7.3 Preparing System for Charging on page17.
2.6 Utility Connections
2.6.1 Main Power and Control Wiring
Systems equipped with a remote condenser require field
wiring (see Figure 10). The installer must provide main power
wiring to theremote condenser controlbox.Thecondenseris
provided with main power and control terminal positions for
connection ofthe field wiring (supplied by others). Additional
conductors maybenecessarydependingonoptionsselected.
Verify that the main power supply coincides with the voltage,
phase and frequency information specified on the system
nameplate (see Figure 11). The supply voltage measuredat
the unit must be within ±10% of the voltage specified on the
nameplate. The nameplate also provides the full load amps
(FLA), the current that the unit will draw under full design
load, the minimum circuit ampacity (MCA) for wire sizing, and
the 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
electrical box.
Pilot holes or electrical knock-outs for the conduit are in the
bottom of the electric box. A label stating MAIN POWER
INPUT is nearby. The main powerwires areterminated atthe
line side of the service disconnect switch located within the
electric box. A separate equipment ground lug is provided
within the electrical box for termination of the earth ground
wire.
WARNINGS
High voltage is used in the operation of this
equipment. Death on contact may result if personnel
fail to observe safety precautions.
The control transformer suppliedwith the equipment is sized
and selected based upon the expected load for the system.
CAUTION
Do not connect any additional loads to the system control
transformer. Connecting additional loads to the factory
suppliedcontroltransformermayresult in overloading of the
transformer.
Figure 10. Field Wiring

-SCS CONDENSER IOM MANUAL
14
Figure 11. Sample Nameplate
CAUTION
Improper wire connections will result in the reverse
rotationofthefan.Tocorrectthisproblem, exchange any two
of the incoming main power wires at the main power circuit
breaker. Do NOT rewire the unit’s individual components.
Identifythe options that were purchased with your system to
confirm which field connections are required. The number
of control conductors needed will vary depending on the
options and type of control method being used. Refer to the
electrical drawing supplied with your unit to determine the
total number of interconnecting conductors required for
your equipment and for the proper wire terminations.
2.6.1.1 Condenser Enable Feature
As an option, the installer may wire a 2-conductor control
cable between the A/C system and the condenser, so the
system controller may enable the condenser to operate only
when the compressoris running.You must remove the jumper
(X2:1-X2:2) from the remote condenser terminal board
(see the condenser wiring diagram). Wire 24 VAC control
conductors from the terminal board within the A/C unit to
the remote condenser terminal board. If control wires aren’t
installed (and the jumper remains in place), the condenser is
always enabled and will turn on and off based on the
condenser’s pressure control switch setting(s).
The condenser enable feature may be used in high ambient
temperature locations to prevent the condenserfrom running
unnecessarily. In some cases, outdoor temperature conditions
may raise refrigerant line pressures high enough to cause
the condenserfans to start operating even ifthe compressor
isn’t on.
2.6.1.2 Receiver Heater Wiring
If separate base frame mounted receiver(s) are used for
SCS condensers, it will be necessaryto provide a 2-conductor
cable for the heating pad(s). Connect the wires from the
terminals inside the junction box on the receiver base (see
Figure 7) to the terminal block in the condenser electric box.
Drill an entrance hole in the condenser electric box or use an
available knock-out if furnished. See the wiring diagram for
the correct wire terminal positions.
2.7 System Charging
Refrigerant charging pressures vary depending on the type
ofrefrigerant used inthe unit. Beforecharging, checkthe unit
nameplateto confirmthe type ofrefrigerantto use.Tables are
provided in Section 2.8 showing the temperature/pressure
characteristics for R407C and R410A.
2.7.1 R407C/R410A Refrigerant
R407C and R410A are blended refrigerants recognized for
beingsaferfortheenvironment.These refrigerantscontain no
chlorine, the component in HCFC’s that destroys the earth’s
ozone layer. However, the same care should be taken to
prevent leakage because R407C and R410Acan contribute
to the greenhouse effect if released. If the refrigerant gas is
released in an enclosed space, it can suffocate.
Refrigerants that are multi-component blends have
component parts with different volatilities that result in a
change in composition and saturation temperature as
evaporation and condensation occur. Typically, the
composition of R407C vapor is different than that of R407C
liquid within a contained system. The composition of liquid
R407C refrigerant remains relatively constant, however, the
refrigerant vapor tends to separate into its component parts
even when circulating.
Refrigerant R410A is similar to R407C in that it is a blended
refrigerant that consists of component parts, however, the
component parts of R410A refrigerant have the same
composition at various operating temperature/pressures in
the liquid phase and gas phase reducing the temperature
glide effect experienced with R407C. R410A operates at

SCS
CONDENSER IOM MANUAL
15
higherpressuresthanR407C,which mustbeconsideredwhencheckingtheoperatingtemperatures/pressureswhile
charging or troubleshooting the system.
2.7.2 Estimating Refrigerant Charge
When charging a system with R407C or R410A refrigerant it will be necessary to weigh in the refrigerant. Calculate
the amount of refrigerant needed by adding the amount of refrigerant required for the A/C unit (shown in the A/C
unit IOM provided separately) plus the refrigerant for the condenser (Table 5 and Table 6) plus the refrigerant piping
(Table 7).
Table 5 and Table 6 may be used to estimate the minimum amount of R407C or R410A refrigerant needed to charge
SCS or SCS-MC condensers by model number. In cases of dual circuited condensers, divide the total weight (lb) shown
by 2 to determine the amount of refrigerant needed for each circuit. The values shown in Table 5 and Table 6 are
conservative for the purpose of preventing the system from being overcharged.
Table 5. SCS Condenser Refrigerant Charge Weights (lb)
SCS Model
Number
R407C Charge
(Condenser
Less Receiver)
R407C Charge
(Condenser with
Receiver)
R410A Charge
(Condenser
Less Receiver)
R410A Charge
(Condenser with
Receiver)
-20°F Ambient &
Higher -30°F Ambient -20°F Ambient & Higher -30°F Ambient
012-S
0.6
2.7
0.5
2.6
018-S
0.6
2.7
0.5
2.6
024-S
1.3
5.4
1.0
5.2
036-S
1.9
8.1
1.5
7.8
060-S
2.8
12.2
2.2
11.7
060-D*
2.8
12.2
2.2
11.7
096-S
3.6
15.7
2.8
15.1
096-D*
3.6
15.7
2.8
15.1
120-S
5.4
23.6
4.2
22.7
120-D*
5.4
23.6
4.2
22.7
144-S
7.2
31.4
5.6
30.2
144-D*
7.2
31.4
5.6
30.2
192-S
8.2
35.9
6.4
34.5
192-D*
8.2
35.9
6.4
34.5
252-S
8.2
35.9
6.4
34.5
252-D*
8.2
35.9
6.4
34.5
276-D*
12.4
53.8
9.7
51.7
312-D*
12.4
53.8
9.7
51.7
447-D*
16.5
71.8
12.9
69.0
525-D*
18.4
80.1
14.4
77.0
597-D*
18.4
80.1
14.4
77.0
683-D*
24.6
106.9
19.2
102.8
940-D*
32.6
141.9
25.5
136.5
1366-D*
49.1
213.7
38.4
205.6
* Dual refrigeration circuits.