Emerson Copeland EazyCool OMQ-56-Nxx-TWD Series Instruction Manual

Copeland EazyCoolTM
outdoor condensing units
for refrigeration networks
Application Guidelines

Condensing Unit For Refrigeration Networks
A
Ap pp pl li ic ca at ti io on n G Gu ui id de el li in ne e
1SAFETY INSTRUCTIONS...........................................................................................2
1.1 ICON EXPLANATION..................................................................................................2
1.2 SAFETY STATEMENTS .............................................................................................. 2
1.3 GENERAL INSTRUCTIONS .........................................................................................3
1.4 ABOUT THIS GUIDELINE: ........................................................................................... 3
2PRODUCT DESCRIPTION..........................................................................................4
2.1 COPELAND EAZYCOOL™ CONDENSING UNITS FOR REFRIGERATION NETWORKS .........4
2.2 NETWORK CONFIGURATIONS .................................................................................... 4
2.3 PRODUCT NAMEPLATE ............................................................................................. 4
2.4 NOMENCLATURE ..................................................................................................... 5
2.5 APPLICATION RANGE ...............................................................................................5
2.6 MAIN COMPONENT DESCRIPTION ..............................................................................6
3INSTALLATION.........................................................................................................13
3.1 CONDENSING UNIT HANDLING................................................................................. 13
3.2 CONNECTION ACCESS ...........................................................................................15
3.3 ELECTRICAL BOX ACCESS ......................................................................................15
3.4 ELECTRICAL CONNECTION......................................................................................16
3.5 REFRIGERATION CONNECTIONS.............................................................................. 18
3.6 2 UNIT NETWORK : INSTALLATION ..........................................................................20
3.7 3 & 4 UNIT NETWORK ...........................................................................................23
3.8 ELECTRONIC CONTROLLER EC2-551..................................................................... 29
4STARTING UP & OPERATION.................................................................................31
4.1 CHARGING PROCEDURE ........................................................................................ 31
4.2 SOUND .................................................................................................................31
4.3 ROTATION DIRECTION OF SCROLL COMPRESSORS ...................................................31
4.4 MAXIMUM COMPRESSOR CYCLE ............................................................................. 32
4.5 CHECKS BEFORE STARTING & DURING OPERATION ..................................................32
5MAINTENANCE & REPAIR: REPLACING A COMPRESSOR................................32
6CERTIFICATION AND APPROVAL .........................................................................32
7DISMANTLING AND DISPOSAL..............................................................................32
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1 Safety instructions
The Copeland EazyCool™ condensing units are manufactured according to the latest
and valid industrial standards.
Particular emphasis has been placed on the user safety.
These condensing units are intended for installation in machines and systems according
to the EC Machines directive. They may be put to service only, if they have been installed
in these machines according to the existing instruction and as a whole agree with the
corresponding provisions of legislation (standards to apply: refer to Manufacturers
declaration).
Manufacturer declaration and declarations of conformity are available on request.
Retain these operating instructions during the entire lifetime of the compressor as well as
the condensing unit.
We strongly advise to follow these safety instructions.
1.1 Icon explanation
WARNING
This Icon indicates instructions to avoid heavy personnel injuries and heavy material
damage.
High Voltage
This icon indicates operations with a danger of an electric shock.
Danger of burning or frostbite
This icon indicates operations with a danger of burning or frostbite.
Explosion Hazard
This Icon indicates operations with a danger of explosion.
CAUTION
This Icon indicates instructions to avoid property damage without or with low personnel
injuries.
IMPORTANT
This icon indicates instructions to avoid malfunction of the compressor.
NOTE this word indicates a recommendation for easier operations.
1.2 Safety statements
 Refrigerant compressors must be employed only for the use they are made for.
 Only qualified and authorised refrigeration personnel are allowed to do the
installation, commissioning and maintenance.
 Qualified electrical personnel must connect the condensing unit and its
accessories.
 All valid standards for connecting electrical and refrigeration equipment must be
observed.
Use personnel safety equipment. This is important to avoid
injuries from the refrigerant.
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1.3 General instructions
WARNING
System breakdown! Personnel injuries! Never install a system in the field and leave it
unattended when it has no charge, a holding charge, or with the service valves closed
without electrically locking out the system.
System breakdown! Personnel injuries! Only approved refrigerant and refrigerating oils
must be used.
High Shell Temperature! Burning! Do not touch the compressor until it has cooled
down. Ensure that other materials in the area of the compressor do not get in touch with
it. Lock and mark accessible sections.
CAUTION
Overheating! Bearing damage! Do not operate compressors without refrigerant charge or
without being connected to the system.
IMPORTANT
Transit damage! Compressor malfunction! Use original packaging. Avoid collisions and
tilting.
Only qualified personnel should install and intervene on COPELAND condensing units.
The contractor, responsible for the installation of the unit, should ensure sufficient liquid
sub-cooling in the line to the expansion valve(s) to avoid “flash-gas” in the liquid line.
It is of vital importance that the discharge stop valve has been fully opened before the
compressor is started. If the discharge stop valve is closed or partly closed an
unacceptable pressure with accordingly high temperatures may develop in the cylinder
head. When operating with air the so-called diesel effect may occur, i.e. the air sucked in
is mixed with oil gas and can explode due to the high temperature in the cylinder head,
and thereby destroy the compressor.
1.4 About this guideline:
These guidelines ensure the safe installation, starting, operation and maintenance of
Copeland EazyCool™ condensing units.
In case of a failure, important topics are mentioned in the chapter causes of failure.
These guidelines are not meant to replace the system expertise available from system
manufacturers.
For additional information, please refer to the “Product Catalogue“ or to the “Copeland
Selection Software” accessible from the Copeland website at www.ecopeland.com.
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2 Product Description
2.1 About Copeland EazyCool™ condensing units for refrigeration
networks
Copeland has developed a special version of Copeland EazyCool condensing units that
can be used to create medium and larger size refrigeration network systems. The range
consists of Copeland EazyCool condensing units for medium and low temperature
applications and covers units from 7.5 to 15 hp. It includes units with two compressors,
allowing modulation in two steps as well as Copeland EazyCool Digital Scroll™
Condensing Units, which feature continuous modulation from 10 to 100%.
The concept of a condensing unit refrigeration network is based on connecting up to four
condensing units mechanically (tubing) and electronically (control system). The control
and oil distribution system is a Master/Slave configuration in which the Master unit takes
care of:
Compressor staging based on suction pressure
 Oil distribution (oil reservoir in master unit)
 Communication for remote monitoring
The Slave unit takes care of:
 Fan speed control
 And emergency control in case of communication line disruption between the unit
(master/slave)
Each Network should have only one master unit.
2.2 Network configurations
Basically there are three different configurations possible: two-unit network, three-unit
network and four-unit network. The three and four condensing unit network requires an
external receiver. Copeland offers a LRU (Liquid Receiver Unit) which contains a 90 l
receiver. If a larger receiver is required, this should be obtained from a third party. The
two-unit network consists of units with internal receivers, which allow faster installation.
2 Unit Network 3 Unit Network with LRU 4 Unit Network with LRU
LRU: Liquid Receiver Unit
2.3 Product nameplate
The condensing unit nameplate shows model designation and serial number.
The compressor has its own nameplate with all electrical characteristics.
The medium temperature range features ZB Scroll compressors, some models include a
Digital Scroll™ compressor.
The low temperature range features ZF Scroll compressors with vapour injection using a
pre-installed sub-cooler.
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2.4 Nomenclature
The model designation contains the following technical information about the condensing
unit:
OM T Q 90 D NL O TFD
1 2 3 4 5 6 7 8 9
Specific for Network
models
1 - Condensing unit family:
OM = Medium temperature Copeland EazyCool™ unit
OL = Low temperature Copeland EazyCool™ unit
2 - Number of compressor: “blank” = single compressor, “T” = two compressors
3 - Quiet version
4 - Compressor size: 90 = 1 x ZBD45KCE (digital), 1 x ZB45KCE
5 - D = Copeland Digital Scroll™
- V = Low temperature:Copeland Scroll™ with vapour injection (EVI)
6 - N= Unit suitable for creation of a refrigeration network
7 - L= Liquid receiver included (only for 2 unit network)
8 - O= Oil reservoir included (always Master)
9 - Motor version: TFD or TWD: 380-420V/3Ph/50H
2.5 Application range
2.5.1 Qualified refrigerants and oils
OMQ-56-Nxx
~
OMQ-110-Nxx
OMTQ-60(D)-Nxx
OMTQ-76-Nxx
OMTQ-90(D)-Nxx
OLQ-24V-Nxx ~ OLQ-48V-Nxx
OLTQ-26V-Nxx & OLTQ-36V-Nxx
Qualified refrigerant R404A/R507
R134a,R407C
R22
R404A/R507
R22
R404A/R507
R22
ICI Emkarate RL 32 CF
Mobil EAL Artic 22 CC
Qualified Servicing Oil
Table 1: Qualified refrigerants and oils
2.5.2 Application limits
For Application envelope, please refer to the Compressor application envelope available
in Copeland Selection Software version 6.
Medium temperature range
Evaporating Temperature: from –30°C up to 12.5°C
Low temperature range
Evaporating Temperature: from –40°C up to 7°C
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2.6 Main component description
2.6.1 Compressor
Unit Model Compressor Model Unit Model Compressor Model
OMQ-56-Nxx-TWD ZB56KCE-TWD-551 OLQ-24V-Nxx-TWD ZF24KVE-TWD-551
OMQ-75-Nxx-TWD ZB75KCE-TWD-551 OLQ-33V-Nxx-TWD ZF33KVE-TWD-551
OMQ-92-Nxx-TWD ZB92KCE-TWD-551 OLQ-40V-Nxx-TWD ZF40KVE-TWD-551
OMQ-110-Nxx-TWD ZB11MCE-TWD-551 OLQ-48V-Nxx-TWD ZF48KVE-TWD-551
OMTQ-60-Nxx-TFD 2 x ZB30KCE-TFD-551 OLTQ-26V-Nxx-TFD 2 x ZF13KVE-TFD-556
OMTQ-60D-Nxx-TFD (*) 1 X ZBD30KCE-TFD-250
1 x ZB30KCE-TFD-551
OMTQ-76-Nxx-TFD 2 x ZB38KCE-TFD-551
OMTQ-90-Nxx-TFD 2 x ZB45KCE-TFD-551 OLTQ-36V-Nxx-TFD 2 x ZF18KVE-TFD-556
OMTQ-90D-Nxx-TFD (*) 1 X ZBD45KCE-TFD-250
1 x ZB45KCE-TFD-551
(*) Digital ScrollTM available in Master version only (NLO & NO)
Low TemperatureMedium Temperature
Two compressor unit
Single compressor unit
Table 2: Compressor type used in Copeland EazyCool™ condensing units for
refrigeration networks
2.6.2 Sound Blanket
The OM(T)Q and OL(T)Q units include one or two compressors, equipped with a sound
jacket.
The sound jacket developed by Copeland has no impact on the performance of the
compressor.
The design consists of a top cap cover and compressor shell cover with adjustable Velcro
system.
It has good characteristics in case of fire and is resistant to:
 Mineral and Polyolester oil
 Refrigerants R22/R404A
 Temperature up to 150°C
 Water
2.6.3 Condenser Fan(s)
The condensers of the OM (T) Q & OL (T) Q units for refrigeration networks are equipped
with single-phase fans, with low speed (910 rpm) 6 pole single-phase motor.
Medium Temp Low Temp
OMQ-56-Nxx OLQ-24V-Nxx
OMQ-75-Nxx OLQ-33V-Nxx
OMQ-92-Nxx OLQ-40V-Nxx
OMQ-110-Nxx OLQ-48V-Nxx
OMTQ-60(D)-Nxx OLTQ-26V-Nxx
OMTQ-76-Nxx
OMTQ-90(D)-Nxx OLTQ-36V-Nxx 2 301 8µF-400V 500 290 1.4 25
Electrical data @ 50 Hz
2
Fan
Model
145
301
145
Condensing unit N° of
Fan
2
2
420
Run Capacitor
Capacity
4µF-400V
8µF-400V
4µF-400V
Voltage
V/ph/Hz
220-240
1~50
Diameter
ø
(mm)
420
500
Power
input (W)
145
290
145
1.4
0.67
Current
input (A)
0.67
Winding
resistance
Ohm (Ω)
70
25
70
Table 3: Condenser fan: technical data
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2.6.4 Liquid receiver
Liquid receiver for 2 unit network system
Master and Slave units for 2-unit network configuration are equipped with a liquid
receiver.
The liquid receivers are equipped with:
 Rotalock service valves for connection of a liquid level equalisation line as well as
a gas pressure equalisation line between the receivers to ensure equal liquid
levels in both receivers. Both lines are partly pre-installed and protrude at the rear
of the units.
 Rotalock service valve on top of the receiver for liquid outlet line.
 3/8’’–14 NPTF connection for relief valve. Maximum allowable working pressure -
MAWP 33 Bar
Fitting a pressure relief device according to standard EN378-2 is the responsibility of the
installer.
Rotalockservicevalve
Receiver
volume
l
OMQ-56-Nxx to OMQ-110-Nxx
OLQ-24V-Nxx to OLQ-48V-Nxx
OMTQ-60-Nxx to OMTQ-90-Nxx
OLTQ-26V-Nxx to OLTQ-36V-Nxx
Model Type
24
Table 4: Receiver volume
It is recommended to charge the system with refrigerant via the Rotalock service valves.
Liquid receiver for 3 and 4 unit network system
With larger systems (refrigeration systems requiring 3 or 4 units in a network) a remote
liquid receiver should be used. The condensing unit models for systems with remote
receivers are provided without liquid receiver. The condenser liquid outlet line protrudes
from the rear of the unit to allow an easy connection to a remote liquid receiver.
Copeland offers a LRU (Liquid Receiver Unit), which contains a 90 litres liquid receiver
for remote use with filter drier, sight glass with moisture indicator and ball valves for liquid
inlet and outlet. If a larger receiver is required, this should be obtained from a third party.
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The LRU collects liquid refrigerant from each condenser in a network. It has a single
liquid inlet and outlet line.
Receiver Depth / Width Height Dimensions Liquid Liquid Weight
Capacity T/B H (holes) Inlet diameter Outlet diameter Net/Gross
l 1) mm mm b x t,(ø mm) ø (inch) ø (inch) kg
Liquid
Receiver
Unit
90 630 / 1250 720 680 x 580 (12) 1 5/8 1 3/8 120 / 142
Table 5: Liquid receiver unit LRU
1) Receiver volume in litre also indicates the pump down capacity in kg (at 50°C Liquid
temperature) when the receiver is 95% filled – Receiver CE approved.
 1/2’’–14 NPTF connection for relief valve. Maximum allowable working pressure -
MAWP 33 Bar
 Fitting a pressure relief device according to standard EN378-2 is the
responsibility of the installer.
2.6.5 Electrical box: components
All electrical components are pre-wired into the panel.
This panel contains:
 Compressor contactor(s)
 Fuse
 Terminal blocks
 DIN rail mounted terminals
 Electronic controller
 Fan Speed controller
 Alarm relays
2.6.6 Pressure switch
All single compressor Copeland EazyCool™ condensing units for refrigeration networks
are equipped with:
 Single low pressure switch with automatic reset: ALCO PS1-W3A
 Electronic Condensing Unit Controller with HP and LP pressure transmitters
All two-compressor Copeland EazyCool™ condensing units for Refrigeration Network are
equipped with:
 Single low pressure switch with automatic reset: ALCO PS1-W3A
 Two high pressure switches ALCO PS3-WF4-HNS
 Electronic Condensing Unit Controller with HP and LP pressure transmitters
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1) PS2-W7A: Alco Controls® dual pressure switch with automatic reset (for single
compressor unit)
The switch is equipped with display scale and pointers to indicate the
approximate settings. The display scales are printed in relative pressure
units “bar” and “psi”.
For precise setting of the control, external gauges must be used.
The PS2-W7A has the following characteristics:
 Automatic reset dual pressure controls
Combined pressure limiter for low pressure / high-pressure
protection.
On pressure rise above the upper setpoint, contacts 1-2 open and
contacts 1-4 close.
On decreasing pressure below lower setpoint contacts 1-4 open and
contacts 1-2 close.
 Adjustable dual pressure switch
Setpoint adjustment range: LP (left) = -0.5 to 7 bar and HP (right) = 6 to 31 bar.
Differential adjustment range: LP = 0,5 to 5 bar, HP = 4 bar.
Factory setting: LP = 3,5 / 4,5 bar, HP = 20 bar.
2 4
1
p
+
-
2) PS1-W3A: Alco Controls single low pressure switch with automatic
reset
The control is equipped with display scale and pointers to indicate the
approximate settings.
The display scales are printed in relative pressure units “bar” and “psi”.
For precise setting of the control, external gauges must be used.
The PS1-W3A has the following characteristics:
 Automatic reset single pressure controls
Pressure limiter for low-pressure protection.
On decreasing pressure below lower set-point contacts 1-4 open and
contacts 1-2 close.
2 4
1
p
+
-
 Adjustable single pressure switch
Setpoint adjustment range: = -0.5 to 7 bar.
Differential adjustment range: = 0,5 to 5 bar.
Factory setting: = 3,5 / 4,5 bar.
3) PS3-WF4-HNS: Alco Controls high pressure switch with an automatic reset
 Automatic reset single pressure switch
Pressure limiter for high-pressure protection.
Switches from 1-2 to 1-4 on rising pressure and from 1-4 to 1-2 on falling
pressure.
 Fixed switch point settings
Cut-out point: 22 bar
Cut-in point: 26.2 bar.
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4) PT3 Pressure Transmitter (Alco Controls)
Two compressor-condensing units are equipped with HP and LP pressure transmitters
that are connected to the EC2 electronic controller.
The EC2 controller description and programming instructions are available in the
corresponding guideline (C6.1.5/E, Part no: 3136444) which is shipped with the units. It
is also available for download on www.eCopeland.com.
An Alco PT3-30A pressure transmitter is used at the high-pressure part of the system.
An Alco PT3-07A pressure controller is used at the low-pressure part of the system.
The PT3 pressure transmitter converts a pressure into a linear electrical 4-20 mA
current output signal. The heart of the transmitter is a piezo resistive chip enclosed in an
oil capsule.
Features:
 Pressure sensitive piezo-based cell with strong primary output signal for precise
and sound-free operation
 Vibration and pulsation resistant
2.6.7 Fan speed controller (FSP150) Alco Controls
An electronic speed control is fitted as standard in units
suitable for refrigeration networks. It controls the speed of the
fans based on condenser pressure. Fan speed is controlled by
the EC2-551 condensing unit controller in combination with a
FSP-150 fan speed controller.
Two fans are controlled at the same time.
The control operates with single-phase motors.
The electrical connection is made in the terminal box of the condensing
unit.
Using a fan speed controller offers the following benefits for your
application:
 The head pressure can be kept high enough to ensure proper operation of the
expansion valve, and hence, sufficient mass flow through the expansion valve to
feed the evaporator. This maintains the required cooling capacity and avoids a
drop of evaporator temperature.
 The sound level of fan motors can be kept at a minimum by avoiding the
permanent on/off cycling of the fan motor. The Alco Controls fan speed control
can be delivered with the Copeland units or as a separate accessory.
2.6.8 Liquid line equipment (only for 2 unit network configuration)
a) Filter drier Alco Controls ADK-plus
ADK-plus liquid line filter-drier is for new installation or after service.
Optimum blend of molecular sieve and activated alumina
b) Liquid sight glass Alco Controls AMI 1SS*
The AMI series of moisture indicator is designed to monitor the moisture
content within the liquid line of a refrigeration system. When the line is empty
of liquid, circles may be seen in the glass. However, when the liquid refrigerant
touches the glass, the circles disappear indicating the system is fully charged.
2.6.9 Liquid line solenoid valve (for low temp. model only) Alco
Controls 200 RBT 5
This is used in low temperature with 2, 3 & 4 unit network systems
 Compact size
 Snap-on clip for attaching solenoid coils
 ∆p minimum = 0,05 bar
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2.6.10Liquid sub-cooler
Condensing units for low temperature applications are equipped with a liquid sub-cooler.
This heat exchanger is used to provide additional sub-cooling to the refrigerant before it
enters the evaporator. This sub-cooling provides a considerable cooling capacity
increase. During the sub-cooling process, a small amount of refrigerant is evaporated in
the liquid sub-cooler. It (sub) cools high-pressure refrigerant liquid that will be injected
into the evaporator. The small amount of evaporated refrigerant in the liquid sub-cooler is
injected into the compressor and provides additional cooling at higher compression ratios,
similar to liquid injection. The diagram below explains the refrigerant flows.
Since the liquid temperature can be as low as –15°C, liquid line insulation should be
applied to avoid freezing of water on the outside of the lines.
VI
LI
LO
VO
VO = Vapour Out, vapour leaving to compressor injection
VI = Vapour In, vapour interring the economiser
LO = Liquid Out, sub-cooled liquid leaving the economiser
LI = Liquid In, Liquid from condenser
Liquid sub-cooler characteristics:
 Standard connection size = 1", Material EN 10272-1.4401 (AISI 316)
 Brazing material = pure copper
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2.6.11Solenoid Valve for Digital Scroll™ compressor
Digital Scroll™ compressors in Copeland EazyCool™ condensing units are equipped
with a 24 Volt AC solenoid valve.
The Electronic Condensing Unit Controller operates the solenoid valve used for
digital compressor modulation based on the suction pressure.
Solenoid valve: Copeland part number 8400784
2.6.12 Oil separator: Alco Controls OSH
The Alco OSH oil separator is fitted as standard on all Copeland EazyCool™ outdoor
units for refrigeration networks.
The oil separator has the following characteristics:
 Hermetic construction
 Comply with UL standard and HP German pressurised vessel regulations (CE
standard effective Nov. 1999)
 PED category I
2.6.13Electronic oil control system (Alco OM3)
Each compressor is fitted with an Alco Controls OM3 oil level controller, which supplies oil
only when required. An oil reservoir is provided on the “Master” unit in a network, and
hence variations in oil quantity in the system can be accommodated.
Model OM3-CCA
- Oil Fill Yes
- Alarm Yes
- Compressor Lockout Yes
- Level control 40%~60%
- Time Delay Alarm 20 sec
- Time Delay Filling 10 sec
Table 6: Properties OMA Traxoil
2.6.14High pressure oil reservoir (Master unit only)
The master unit in network is equipped with a large oil reservoir of 8 litres, which collects
oil from Master & Slave oil separators. Oil is re-distributed to each compressor via the oil
level controller OM3.
 PED category I
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3 Installation
The Copeland EazyCool™ condensing units are delivered with a holding charge of
neutral gas.
WARNING
High pressure! Injury to skin and eyes possible! Be careful when opening connections
on a pressurized system.
The condensing unit should be located in such a place to prevent any dirt, plastic bag,
leaves or papers from covering the condenser and its fins.
A clogged condenser will increase the condensing temperature, thus reduce the cooling
capacity, and lead to a high pressure switch tripping. Clean the condenser fins on a
regular basis.
3.1 Condensing unit handling
11
2
Storage Transport
3.1.1 Transport and storage
It is recommended to keep the unit packaged until final
installation.
We recommend handling large outdoor units (when boxed) with a forklift on the position
indicated on the box.
Compressor(s) and liquid receiver compartment
Side loading for forklift Front loading for forklift at Approx. location of
the side of the unit where centre of gravity
the centre of gravity is shown
The unit without packaging must be handled by a forklift truck, while taking care of the
centre of gravity of the unit. See also pictures above (front view). Weights: please refer to
table 7.
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Net Gross Net Gross
OMQ-56 NLO/NL/NO/N 234 278 OLQ-24V NLO/NL/NO/N 226 270
OMQ-75 NLO/NL/NO/N 234 278 OLQ-33V NLO/NL/NO/N 226 270
OMQ-92 NLO/NL/NO/N 244 288 OLQ-40V NLO/NL/NO/N 236 280
OMQ-110 NLO/NL/NO/N 253 297 OLQ-48V NLO/NL/NO/N 245 289
OMTQ-60 NLO/NL/NO/N 216 260 OLTQ-26V NLO/NL/NO/N 218 262
OMTQ-60(D) NLO /NO 216 260
OMTQ-76 NLO/NL/NO/N 218 262
OMTQ-90 NLO/NL/NO/N 222 266 OLTQ-36V NLO/NL/NO/N 224 268
OMTQ-90(D) NLO/NO 222 266
Condensing unit with single compressor
Condensing unit with two compressors
Weight (kg) Weight (kg)
Low temperature unitsMedium temperature units
Table 7: Weights twin fan units
Net weight = bare unit; Gross weight = unit + packaging
3.1.2 Dimensions in mm
Copeland EazyCool™ units NLO / NL / NO /N
OMQ-56 to OMQ-110, OMTQ(D)-60 to OMTQ(D)-90
OLQ-24V to OLQ-48V, OLTQ-26V & OLTQ-36V
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Condensing Unit For Refrigeration Networks
3.2 Connection access
Access door to electrical and refrigeration components.
Access door opening: use supplied key to open and close the access door.
3.3 Electrical box access
OMQ-56-Nxx to OMQ-110-Nxx, OMTQ-60(D)-Nxx to OMTQ90(D)-Nxx
OLQ-24V-Nxx to OLQ-48V-Nxx, OLTQ-26V-Nxx & OLTQ-36V-Nxx
Open the latch on the top of the electrical panel to open it forward
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Condensing Unit For Refrigeration Networks
3.4 Electrical connection
3.4.1 Power supply connections
Electrical connection of the outdoor condensing unit network to the power supply must be
made by qualified technicians, who should refer to the electrical diagrams located inside
the electric connection panel.
Main electrical cable entry Contactor
Accesstothe
Mounting area for main isolator switch electrical components.
3.4.2 Electrical components pre-wired
 Compressor(s) contactor
 Condenser Fan motors
 Fan Speed controller
 High and Low pressure switches
 Electronic controller
 Crankcase heater(s)
Care should be taken for electrical connection to avoid reverse rotation (see paragraph
6.6)
3.4.3 Discharge temperature protection
Discharge line thermostat
Under extreme operating conditions internal discharge temperatures can reach very high
levels. To avoid compressor damage, the ZF13KVE & ZF18KVE compressors are
equipped with an external discharge line thermostat. Digital Scroll™ compressors ZBD-
30-KCE & ZBD-45-KCE are also equipped with a discharge line thermostat.
INT 69 SCY module
Compressors ZF24-KVE, ZF33-KVE, ZF40-KVE & ZF48-KVE are equipped with an INT
69 module.
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Condensing Unit For Refrigeration Networks
3.4.4 Electric protection standard
 Scroll compressors up to ZB45 / ZF18 are IP 21 according to IEC 34. All larger
compressors are IP54.
 Fan IP54 according to IEC 34.
 HP-LP and HP safety pressure switches (Alco PS2 and PS1) are IP44 according
to IEC 529/EN 60529.
 PS3 switch with cable assy IP65 according to EN 175301-803/IEC 529.
 Fan speed controller FSM is IP 65 according to IEC529/DIN 40050.
 Solenoid valve coils: IP65 according to DIN 43650
 EC2-5X1: IP65 (frontal protection with gasket)
 Electrical panel IP Rating: IP54
3.4.5 Condensing unit electrical data
Table 8: Electrical data
Single compressor
condensing unit
Max. operating
Current
(compressor)
Locked Rotor
Current
(compressor)
Fan
Model Max. fan Current Max. operating Current (Unit)
AA AA
Medium Temperature TWD TWD 230V / 1~/50Hz TWD
OMQ-56-NLO/NL/NO/N 15.4 99 2 x 145 0.67 16.74
OMQ-75-NLO/NL/NO/N 21.7 127 2 x 145 0.67 23.04
OMQ-92-NLO/NL/NO/N 25.1 167 2 x 301 1.56 28.22
OMQ-110-NLO/NL/NO/N 29.2 198 2 x 301 1.56 32.32
Low Temperature TWD TWD 230V / 1~/50Hz TWD
OLQ-24V-NLO/NL/NO/N 16.1 2 x 145 0.67 17.44
OLQ-33V-NLO/NL/NO/N 22.3 2 x 145 0.67 23.64
OLQ-40V-NLO/NL/NO/N 25.1 2 x 301 1.56 28.22
OLQ-48V-NLO/NL/NO/N 30.6 2 x 301 1.56 33.72
Two compressor
condensing unit
Max. operating
Current
(compressor) 1)
Locked Rotor
Current
(compressor) 1)
Fan
Model Max. fan
Current 3) Max. operating
Current (Unit)
AA AA
Medium Temperature TFD TFD 230V / 1~/50Hz TFD
OMTQ-60-NLO/NL/NO/N 10.3 49 2 x 145 0.67 21.94
OMTQ-60(D)-NLO /NO 7.9 / 10.3 2) 52 2 x 145 0.67 19.54
OMTQ-76-NLO/NL/NO/N 12.8 66 2 x 145 0.67 26.94
OMTQ-90-NLO/NL/NO/N 13.1 74 2 x 301 1.56 29.32
OMTQ-90(D)-NLO/NO 11.4 / 13.1 2) 74 2 x 301 1.56 27.62
Low Temperature TFD TFD 230V / 1~/50Hz TFD
OLTQ-26V-NLO/NL/NO/N 8 52 2 x 145 0.67 17.34
OLTQ-36V-NLO/NL/NO/N 12 74 2 x 301 1.56 27.12
1) Data for one compressor
2) Digital ScrollTM / Standard Compressor
3) Data for one fan motor
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C6.1.4/0305/E 17 Part no: 3136433

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Condensing Unit For Refrigeration Networks
3.5 Refrigeration connections
Master unit oil in / out connections
1 = Suction line
2 = Liquid outlet line
3 = Liquid level equalisation line (receiver) (*)
4 = Liquid receiver pressure equalisation line (receiver) (*)
5 = Outlet oil distributing circuit
“Oil Out” of the Master unit should be connected to the “Oil In” connection of
the Slave unit, this line is oil from the oil reservoir (Master unit) to the slave unit(s)
compressor(s)
6 = Inlet oil distributing circuit
“Oil In” of the Master unit should be connected to the “Oil Out” connection of
the Slave unit, this is oil from Slave unit oil separator to the Master unit oil reservoir.
(*) Only on condensing units in network of 2 units. (Liquid line should be insulated on
OLQ-24V-N to OLQ-48V-N, OLTQ-26V-N & OLTQ-36V-N. Temperature could be as low
as –15°C).
3.5.1 Brazing recommendation
 Remove the plugs in the following sequence:
1. Remove the discharge connection plug
2. Then remove the suction connection plug
Removing the plugs in this sequence prevents oil mist from coating the suction
tube making brazing difficult.
 Be sure tube fitting inner diameter and tube outer diameter are clean prior to
assembly.
 Both tubes are extended from the condensing unit housing, therefore we
recommend isolate the housing by using a wet cloth on the copper tubing.
 Recommended brazing materials: A copper/phosphorous or
copper/phosphorous/silver alloy rod should be used for joining copper to copper
whereas to join dissimilar or ferric metals a silver alloy rod either flux coated or
with a separate flux would be used.
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Condensing Unit For Refrigeration Networks
 Use a double-tipped torch Sectional view
End of tube
During brazing pull
back line insulation.
During brazing
protect housing
with a damp cloth
Brazing of the tubes:
For brazing of the tubes see illustration below and the following procedures:
Fit the copper tube into the compressor tube.
1. Heat area 1. As the tube approaches brazing temperature:
2. Heat area 2 until braze temperature is attained. It is necessary
to heat the tube evenly. Move the torch up and down and
rotating around the tube.
3. Add braze material to the joint while moving the torch around
the joint to flow braze material around the circumference.
4. Then heat area 3. This will draw the brazing material down into
the joint.
NOTE: The time spent heating area 3 should be minimal. As with any brazed joint,
overheating may be detrimental to the final result.
To disconnect:
Heat joint areas 2 and 3 slowly and uniformly until solder softens and tube can be pulled
out of the fitting.
To reconnect:
See the procedure above.
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