Daikin DWSC 050 User manual

Single/Dual Compressor Centrifugal Chillers
DWSC/DWDC 050, 063, 079, 087, 100, 113, 126, Cooling Only
DWCC 100, 113, 126
DHSC 050, 063, 079, 087, 100, 126, Heat Recovery
Original Instructions
Installation, Operation and Maintenance Manual
D-EIMWC00804-14EN

D-EIMWC00804-14EN Centrifugal Chillers 3
IMPORTANT
The units described in the present manual represent a valuable investment. Maximum care should be taken to ensure correct
installation and appropriate working conditions of the units.
Installation and maintenance must be performed by qualified and specifically trained personnel only.
Correct maintenance of the unit is indispensable for its safety and reliability. Manufacturer’s service centres are the only having
adequate technical skill for maintenance.
CAUTION
This manual provides information about the features and procedures for the complete series.
All units are delivered from factory as complete sets which include wiring diagrams and dimensional drawings with size, weight
and features of each model.
WIRING DIAGRAMS AND DIMENSIONAL DRAWINGS MUST BE CONSIDERED ESSENTIAL DOCUMENTS OF
THIS MANUAL
In case of any discrepancy between this manual and the two aforesaid documents, please refer to the wiring diagram and
dimensional drawings.
WARNING
Before starting the installation of the unit, please read this manual carefully. Starting up the unit is absolutely
forbidden if all instructions contained in this manual are not clear.

4Centrifugal Chillers D-EIMWC00804-14EN
Warnings for the operator
The operator must read this manual before using the unit.
The operator must be trained and instructed on how to use the unit.
The operator must strictly follow local safety regulation and laws.
The operator must strictly follow all instruction and limitation given for the unit
Key to symbols
Important note: failure to respect the instruction can damage the unit or compromise functioning
Note regarding safety in general or respect of laws and regulations
Note concerning electrical safety
Safe use and maintenance of the unit, as explained in this manual, is fundamental to prevent accidents
during operation and maintenance and repair work.
Therefore, it is highly recommended that this document be read carefully, complied with and stored safely.
Should additional maintenance be required, it is advisable to consult authorised staff before carrying out any
repair work.
Description of the labels applied to the electrical panel
Compressor Starter Panel
1
– Manufacturer’s logo
3
– Cable tightening warning
2
– Hazardous Voltage warning
4
– Electrical hazard symbol
WARNING
It 's absolutely forbidden to remove all the protections of the moving parts of the unit

D-EIMWC00804-14EN Centrifugal Chillers 5
Unit Control Panel
1
– Non flammable gas symbol
5
– Unit nameplate data
2
– Electrical hazard symbol
6
– Unit characteristics technical
3
– Gas type
7
– Emergency stop
4
– Control panel code
Compressor Control Panel
Motor Terminal Box
1
– Terminal box fixing
3
– Electrical hazard symbol
2
– Manufacturer’s logo
4
– Terminal connection
1– Components layout 3 – Electrical hazard symbol
2– Hazardous Voltage warning 4 – Compressor control panel code

6Centrifugal Chillers D-EIMWC00804-14EN
Table of Contents
Warnings for the operator.....................................................................................................4
Introduction .....................................................................................................8
General Description .............................................................................................................8
Application...........................................................................................................................8
Nomenclature.......................................................................................................................8
Installation........................................................................................................9
Receiving and Handling.......................................................................................................9
Location and Mounting......................................................................................................10
Operating/Standby Limits ..................................................................................................10
Safety ................................................................................................................................. 11
System Water Volume ........................................................................................................12
Low Condenser Water Temperature Operation..................................................................12
Water Piping.......................................................................................................................15
Field Insulation Guide........................................................................................................19
Physical Data and Weights.................................................................................................21
Oil Coolers.........................................................................................................................23
Oil Heater...........................................................................................................................26
Relief Valves......................................................................................................................26
Electrical............................................................................................................................27
Power Wiring .....................................................................................................................27
Remote Starter Display Wiring ..........................................................................................29
Control Power Wiring........................................................................................................29
Multiple Chiller Setup........................................................................................................34
Prestart System Checklist...................................................................................................37
Operation........................................................................................................38
Operator Responsibilities...................................................................................................38
Standby Power ...................................................................................................................38
MicroTech IIControl......................................................................................................38
Capacity Control System....................................................................................................40
Surge and Stall ...................................................................................................................43
Lubrication System ............................................................................................................43
Hot Gas Bypass..................................................................................................................44
Condenser Water Temperature...........................................................................................44
Maintenance...................................................................................................46
Pressure/Temperature Chart...............................................................................................46
Routine Maintenance .........................................................................................................46
Annual Shutdown...............................................................................................................49
Annual Startup ...................................................................................................................50
Repair of System................................................................................................................51
Oil Analysis........................................................................................................................53
Maintenance Schedule...................................................................................56
Service Programs...........................................................................................58
Operator Schools ...........................................................................................58
Warranty Statement......................................................................................58
Obligatory routine checks and starting up apparatuses under pressure.59
Important information regarding the refrigerant used .............................60

D-EIMWC00804-14EN Centrifugal Chillers 7
Information and illustrations cover the Daikin products at the time of publication and we reserve the right to make changes in
design and construction at anytime without notice.

8Centrifugal Chillers D-EIMWC00804-14EN
Introduction
General Description
Daikin Centrifugal Water Chillers are complete, self-contained, automatically controlled fluid
chilling units. Each unit is completely assembled and factory tested before shipment. Models
DWSC/DWDC/DWCC are cooling-only and Models DHSC are cooling with heat recovery
accomplished in a bundle of condenser tubes separate from the cooling tower tube bundle.
In the DWSC and DHSC series, each unit has one compressor connected to a condenser and
evaporator. The DWDC series is equipped with two compressors operating in parallel on a single
evaporator and condenser. The DWCC series is equipped with two compressors, each operating
on one refrigerant circuit of a two circuit evaporator and condenser. Information in this manual
referring to DWSC and DWDC also applies to DWCC and DHSC units except where specifically
noted.
The chillers use refrigerant R-134a to reduce the size and weight of the package compared to
negative pressure refrigerants, and since R-134a operates at a positive pressure over the entire
operation range, no purge system is required.
The controls are pre-wired, adjusted and tested. Only normal field connections such as piping,
electrical and interlocks, etc. are required, thereby simplifying installation and increasing
reliability. Most necessary equipment protection and operating controls are factory installed in
the control panel.
The basic sizes of units are the 050 063, 076, 079, 087, 100, 113 and 126. They provide a cooling
capacity range from 80 tons to 2500 tons. In this manual all references to the DWSC models will
equally apply to other models unless specifically referenced otherwise.
Application
The procedures presented in this manual apply to the standard DWSC/DWDC/DWCC family of
chillers and DHSC heat recovery chillers. Refer to the Operating Manual, OM CentrifMicro II
(latest version available on www.daikineurope.com), for details on operation of the MicroTech
IIunit controller.
All Daikin centrifugal chillers are factory tested prior to shipment and must be initially started at
the job site by a factory trained Daikin service technician. Failure to follow this startup procedure
can affect the equipment warranty.
The standard limited warranty on this equipment covers parts that prove defective in material or
workmanship. Specific details of this warranty can be found in the warranty statement furnished
with the equipment.
Cooling towers used with Daikin centrifugal chillers are normally selected for maximum
condenser inlet water temperatures between 75°F and 90°F (24°C and 32°C). Lower entering
water temperatures are desirable from the standpoint of energy reduction, but a minimum does
existHeat recovery models, DHSC, basically operate the same as cooling-only units. The heat
recovery function is controlled externally to the chiller as explained later in this manual.
Nomenclature D W D C 063
W = Water-cooled
H =
H
eat Recovery
D = Dual Compressor
S = Single Compressor
C = Dual, Counterflow
Centrifugal Compressor
Chiller Model, Based on
Impeller Diameter
D
=
D
aikin

D-EIMWC00804-14EN Centrifugal Chillers 9
Installation
Receiving and Handling
The unit should be inspected immediately after receipt for possible damage.
All Daikin centrifugal water chillers are shipped FOB factory and all claims for handling and
shipping damage are the responsibility of the consignee.
Insulation corners from the evaporator's rigging hole locations are shipped loose and should be
glued in place after the unit is finally placed. Neoprene vibration pads are also shipped loose.
Check that these items have been delivered with the unit.
If so equipped, leave the shipping skid in place until the unit is in its final position. This will
aid in handling the equipment.
Extreme care must be used when rigging the equipment to prevent damage to the control panels
or refrigerant piping. See the certified dimension drawings included in the job submittal for the
center of gravity of the unit. Consult the local Daikin sales office for assistance if the drawings
are not available.
The unit can be lifted by fastening the rigging hooks to the four corners of the unit where the
rigging eyes are located (see Figure 1). Spreader bars must be used between the rigging lines to
prevent damage to the control panels, piping and motor terminal boxes.
Figure 1, DWSC Major Component Locations
Unit Control
Panel
Rigging
Locations
(6) Available
Evaporator
Condenser
Rigging
Locations
(6) Available
Compressor Starter,
Mounting Optional
Compressor Control
Panel, At Rear
Operator Interface
Panel

10 Centrifugal Chillers D-EIMWC00804-14EN
Figure 2, DDWDC Major Component Location
Note: 1. Chilled water and condenser connection location can vary. Check markings on unit
or consult unit certified drawings for connection locations on specific units. 2. DWCC
two-circuit units have separate evaporator and condenser relief valves on each circuit.
Location and Mounting
The unit must be mounted on a level concrete or steel base and must be located to provide service
clearance at one end of the unit for possible removal of evaporator tubes and/or condenser tubes.
Evaporator and condenser tubes are rolled into the tube sheets to permit replacement if necessary. The
length of the vessel should be allowed at one end. Doors or removable wall sections can be utilized for
tube clearance. Minimum clearance at all other points, including the top, is 3 feet (1 meter). The
National Electric Code (NEC) can require four feet or more clearance in and around electrical
components and must be checked.
Operating/Standby Limits
Equipment room temperature, standby
•Water in vessels and oil cooler: 32°F to 122°F (0°C to 50°C)
•Without water in vessels and oil cooler: 0°F to 140°F (-18°C to 60°C)
•WMC without water in vessels: 0°F to 130°F (-18°C to 54.4 °C)
Equipment room temperature, operating: 32°F to 104°F (0°C to 40°C)
Condenser
Rigging
Eyes
Condenser
Dual Relief
Valves
Rigging
Eyes
Oil Sump,
Pump, Heaters
Motor
Terminal Box
Common Oil
Cooler Water
Connections
Lubrication &
Compressor
Control Boxes

D-EIMWC00804-14EN Centrifugal Chillers 11
Maximum entering condenser water temperature, startup: design plus 5 degrees F (2.7 degrees
C)
Maximum entering condenser water temperature, operating: job specific design temperature
Minimum entering condenser water temperature, operating: see page 12.
Minimum leaving chilled water temperature: 38°F (3.3°C)
Minimum leaving chilled fluid temperature with correct anti-freeze fluid: 15°F (9.4°C)
Maximum entering chilled water temperature, operating: 90°F (32.2°C)
Maximum oil cooler/VFD entering temperature: 90°F (32.2°C)
Minimum oil cooler/VFD entering temperature: 42°F (5.6°C)
Vibration Pads
The shipped-loose neoprene vibration pads should be located under the corners of the unit
(unless the job specifications state otherwise). They are installed to be flush with the sides and
outside edge of the feet. Most DWSC units have six mounting feet although only the outer
four are required. Six pads are shipped and the installer can place pads under the middle feet if
desired.
Mounting
Make sure that the floor or structural support is adequate to support the full operating weight of
the complete unit.
It is not necessary to bolt the unit to the mounting slab or framework; but should this be
desirable, 1 1/8" (28.5 mm) mounting holes are provided in the unit support at the four corners.
Note: Units are shipped with refrigerant and oil valves closed to isolate these fluids for
shipment. Valves must remain closed until start-up by the Daikin technician.
Nameplates
There are several identification nameplates on the chiller:
•The unit nameplate is located on the side of the Unit Control Panel. It has a Style No.
XXXX and Serial No. XXXX, both are unique to the unit and will identify it. These
numbers should be used to identify the unit for service, parts, or warranty questions. This
plate also has the unit refrigerant charge.
•Vessel nameplates are located on the evaporator and condenser. Along with other
information, they have a National Board Number (NB) and a serial number, either of which
identify the vessel (but not the entire unit).
•A compressor nameplate is located on the compressor itself and contains identification
numbers.
Safety
The machine must be firmly secured to the ground.
It is essential to observe the following instructions:
- The machine must be raised only by the lifting points. Only these points can support the whole weight of
the unit.
- Do not allow unauthorised and/or unqualified personnel to access the
machine.
- It is forbidden to access the electrical components without having opened the
machine's general disconnecting switch and switched off the power supply.

12 Centrifugal Chillers D-EIMWC00804-14EN
- It is forbidden to access the electrical components without using an insulating
platform. Do not access the electrical components if water and/or moisture
are present.
-All operations on the refrigerant circuit and on components under pressure must
be carried out by qualified personnel only.
- Replacement of a compressor or addition of lubricating oil must be carried out
by qualified personnel only- Sharp edges can cause wounds. Avoid direct contact.
-Avoid introducing solid bodies into the water pipes while the machine is connected to the system.
-Amechanical filter must be installed on the water pipe connected to the heat exchanger inlet.
- The machine is supplied with safety valves, that are installed on both the high
and the low pressure sides of the refrigerant circuit.
In case of sudden stop of the unit, follow the instructions on the Control Manual Operating Manual
which is part of the on-board documentation delivered to the end user with this manual.
It is recommended to perform installation and maintenance with other people. In case of accidental
injury or unease, it is necessary to:
- keep calm
- press the alarm button if present in the installation site
- move the injured person in a warm place far from the unit and in rest position
- contact immediately emergency rescue personnel of the building or if the Health Emergency
Service
- wait without leaving the injured person alone until the rescue operators come
- give all necessary information to the the rescue operators
System Water Volume
All chilled water systems need adequate time to recognize a load change, respond to that load
change and stabilize, without undesirable short cycling of the compressors or loss of control.
In air conditioning systems, the potential for short cycling usually exists when the building
load falls below the minimum chiller plant capacity or on close-coupled systems with very
small water volumes.
Some of the things the designer should consider when looking at water volume are the
minimum cooling load, the minimum chiller plant capacity during the low load period and the
desired cycle time for the compressors.
Assuming that there are no sudden load changes and that the chiller plant has reasonable
turndown, a rule of thumb of “gallons of water volume equal to two to three times the chilled
water gpm flow rate” is often used.
A properly designed storage tank should be added if the system components do not provide
sufficient water volume.
Low Condenser Water Temperature Operation
When ambient wet bulb temperature are lower than design, the condenser water temperature
can be allowed to fall. Lower temperatures will improve chiller performance.
Up to 300 Tons
Daikin centrifugal chillers up to 300 tons are equipped with electronic expansion valves (EXV)
and will start and run with entering condenser water temperatures as low as shown in Figure 3
or as calculated from the following equation on which the curves are based.

D-EIMWC00804-14EN Centrifugal Chillers 13
Figure 3, Minimum Entering Condenser Water Temperature (EXV)
Min. ECWT = 5.25 + 0.88*(LWT) - DT
FL*
(PLD/100) + 22*(PLD/100)
2
•ECWT = Entering condenser water temperature
•LWT = Leaving chilled water temperature
•DT
FL
= Chilled Water Delta-T at full load
•PLD = The percent chiller load point to be checked
For example; at 44°F LWT, 10 degree F Delta-T, and 50% full load operation, the
entering condenser water temperature could be as low as 44.5°F. This provides excellent
operation with water-side economizer systems.
Over 300 Tons
Chillers over 300 tons are equipped with thermal expansion valves (TXV) and will start
and run with entering condenser water temperatures as low as calculated by the
following equation and shown in the chart following.
Min. ECWT = 7.25 + LWT– 1.25* DT
FL
(PLD/100) + 22*(PLD/100)
2
•ECWT = Entering condenser water temperature
•LWT = Leaving chilled water temperature
•DT
FL
= Chilled Water Delta-T at full load
•PLD = The percent chiller load point to be checked
Figure 4, Minimum Entering Condenser Water Temperature (TXV)
Minimum Entering Condenser Water Temperature - 10 F Range
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
0 10 20 30 40 50 60 70 80 90 100 110
Percent Load
ECWT, F
44 LChWT
42 LChWT
46 LChWT

14 Centrifugal Chillers D-EIMWC00804-14EN
For example; at 44°F LWT, 10 degree F Delta-T, and 50% full load operation, the
entering condenser water temperature could be as low as 50.5°F. This provides excellent
operation with water-side economizer systems.
Depending on local climatic conditions, using the lowest possible entering condenser
water temperature may be more costly in total system power consumed than the expected
savings in chiller power would suggest, due to the excessive fan power required.
Cooling tower fans must continue to operate at 100% capacity at low wet bulb
temperatures. As chillers are selected for lower kW per ton, the cooling tower fan motor
power becomes a higher percentage of the total peak load chiller power. Daikin’s Energy
Analyzer program can optimize the chiller/tower operation for specific buildings in
specific locales.
Even with tower fan control, some form of water flow control, such as tower bypass, is
recommended.
Figure 5 illustrates two temperature actuated tower bypass arrangements. The “Cold
Weather” scheme provides better startup under cold ambient air temperature conditions.
The check valve may be required to prevent entraining air at the pump inlet.
Figure 5, Bypass, Mild Weather Operation
Bypass, Cold Weather Operation
Minimum Entering Condenser Water Temperature - 10 F Range
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
0 10 20 30 40 50 60 70 80 90 100 110
Percent Load
ECWT, F
44 LChWT
42 LChWT
46 LChWT

D-EIMWC00804-14EN Centrifugal Chillers 15
Water Piping
Water Pumps
Avoid the use of 3600/3000-rpm (two-pole motor) pump motors. It is not uncommon to find
that these pumps operate with objectionable noise and vibration.
It is also possible to build up a frequency beat due to the slight difference in the operating rpm
of the pump motor and the Daikin centrifugal motor. Daikin encourages the use of 1750/1460
rpm (four-pole) pump motors.
Vessel Drains at Start-up
Unit vessels are drained of water in the factory and are shipped with the drain plugs in the
heads removed and stored in the control panel or with open ball valves in the drain hole. Be
sure to replace plugs or close the valves prior to filling the vessel with fluid.
Evaporator and Condenser Water Piping
All evaporators and condensers come standard with Victaulic
AWWA C-606 groove nozzles (also suitable for welding), or
optional flange connections. The installing contractor must
provide matching mechanical connections or transitions of the
size and type required. A heat recovery chiller, DHSC, (shown
on the right) has two sets of condenser piping; one for the tower,
one for the heating system.
The tower connections are always the inboard pair of
connections. In the figure to the right, the condenser connections
are “left-hand” when viewed from the front of the unit (Unit
Control Panel and Interface Panel side), so in this case, the right-
hand condenser connections would be for the tower.
If the condenser connections were on the other end (“right-
hand”), the tower connections would be the left-hand pair of
Important Note on Welding
If welding is to be performed on the mechanical or flange connections, remove the solid-state
temperature sensor and thermostat bulbs from the wells to prevent damage to those
components. Also properly ground the unit or severe damage to the MicroTech II unit
controller can occur.
Water pressure gauge connection taps and gauges must be provided in the field piping at the
inlet and outlet connections of both vessels for measuring the water pressure drops. The
pressure drops and flow rates for the various evaporators and condensers are job specific and
the original job documentation can be consulted for this information. Refer to the nameplate
on the vessel shell for identification.
Be sure that water inlet and outlet connections match certified drawings and stenciled nozzle
markings. The condenser is connected with the coolest water entering at the bottom to
maximize subcooling.
Note: When common piping is used for both heating and cooling modes, care must
be taken to provide that water flowing through the evaporator cannot exceed 110°F
which can cause the relief valve to discharge refrigerant or damage controls.
The piping must be supported to eliminate weight and strain on the fittings and connections.
Piping must also be adequately insulated. A cleanable 20-mesh water strainer must be

16 Centrifugal Chillers D-EIMWC00804-14EN
installed in both water inlet lines. Sufficient shutoff valves must be installed to permit
draining the water from the evaporator or condenser without draining the complete system.
Flow Switch
A water flow switch must be installed to signal the presence of adequate water flow to the
vessels before the unit can start. They also serve to shut down the unit in the event that water
flow is interrupted to guard against evaporator freeze-up or excessive discharge pressure.
Thermal dispersion flow switches are available from Daikin as a factory-mounted option. It is
mounted in an evaporator and condenser water nozzle and factory wired.
A paddle type flow switch can be supplied by the owner for field mounting and wiring.
Figure 6, Flow Switch Mounting
If flow switches, by themselves, are being used, electrical connections in the Unit Control
Panel must be made from the common T3-S terminal to terminal CF for the condenser switch
and T3-S to terminal EF for the evaporator switch. See Figure 15, Field Wiring Diagram on
page 33. The normally open contacts of the flow switch must be wired between the terminals.
Flow switch contact quality must be suitable for 24 VAC, low current (16ma). Flow switch
wire must be in separate conduit from any high voltage conductors (115 VAC and higher).
Table 1, Flow Switch Flow Rates
Pipe Size
(NOTE !) inch 1 1/4 1 1/2 2 2 1/2 3 4 5 6 8
mm 32 (2) 38 (2) 51 63 (3) 76 102 (4) 127 (4) 153 (4) 204 (5)
Min.
Adjst.
Flow gpm 5.8 7.5 13.7 18.0 27.5 65.0 125.0 190.0 205.0
Lpm 1.3 1.7 3.1 4.1 6.2 14.8 28.4 43.2 46.6
No
Flow gpm 3.7 5.0 9.5 12.5 19.0 50.0 101.0 158.0 170.0 Lpm 0.8 1.1 2.2 2.8 4.3 11.4 22.9 35.9 38.6
Max.
Adjst.
Flow gpm 13.3 19.2 29.0 34.5 53.0 128.0 245.0 375.0 415.0
Lpm 3.0 4.4 6.6 7.8 12.0 29.1 55.6 85.2 94.3
No
Flow gpm 12.5 18.0 27.0 32.0 50.0 122.0 235.0 360.0 400.0 Lpm 2.8 4.1 6.1 7.3 11.4 27.7 53.4 81.8 90.8
NOTES:
1. Asegmented 3-inch paddle (1, 2, and 3 inches) is furnished mounted, plus a 6-inch paddle loose.
2. Flow rates for a 2-inch paddle trimmed to fit the pipe.
3. Flow rates for a 3-inch paddle trimmed to fit the pipe.
4. Flow rates for a 3-inch paddle.
5. Flow rates for a 6-inch paddle
6. There is no data for pipe sizes above 8-inch. A switch minimum setting should provide protection
against no flow and close well before design flow is reached.
Alternatively, for a higher margin of protection, normally open auxiliary contacts in the pump
starters can be wired in series with the flow switches as shown in Figure 15, Field Wiring
Diagram on page 33.
Flow direction marked
on switch
I in. (25mm) NPT flow
switch connection
Tee

D-EIMWC00804-14EN Centrifugal Chillers 17
CAUTION
Freeze Notice: Neither the evaporator nor the condenser is self-draining;
both must be blown out to help avoid damage from freezing.
The piping should also include thermometers at the inlet and outlet connections and air vents at
the high points.
The water heads can be interchanged (end for end) so that the water connections can be made
at either end of the unit. If this is done, new head gaskets must be used and control sensors
relocated.
In cases where the water pump noise can be objectionable, vibration isolation sections are
recommended at both the inlet and outlet of the pump. In most cases, it will not be necessary
to provide vibration eliminator sections in the condenser inlet and outlet water lines. But they
can be required where noise and vibration are critical.
Cooling Towers
The condenser water flow rate must be checked to be sure that it conforms to the system
design. Some form of temperature control is also required if an uncontrolled tower can supply
water below about 65°F (18°C). If tower fan control is not adequate, a tower bypass valve is
recommended. Unless the system and chiller unit are specifically for condenser bypass or
variable condenser flow is not recommended since low condenser flow rates can cause
unstable operation and excessive tube fouling.
The condenser water pumps must cycle on and off with the unit. See Figure 15, Field Wiring
Diagram on page 33 for wiring details.
Tower water treatment is essential for continued efficient and reliable unit operation. If not
available in-house, competent water treatment specialists can be contracted.
Heat Recovery Chillers
DHSC heat recovery chillers control the chilled water leaving temperature. The cooling load
determines compressor loading and unloading, the same as in a conventional chiller. A heat
recovery chiller’s control algorithms are identical to a conventional cooling-only chiller.
The temperature of the hot water being supplied from the recovery condenser to the heating
load is established by manipulating the cooling tower water temperature. The 3-way cooling
tower bypass valve is controlled by the heating water inlet temperature to the recovery bundle
of the condenser. Based on the signal the 3-way valve gets from the heating hot water sensor,
it will bypass sufficient water around the tower to force the tower condenser water loop high
enough for the recovery bundle to produce the desired hot water temperature.
The chilled water and its control system do not “know” that the condensing pressure and
condenser water temperatures are being regulated in this manner.

18 Centrifugal Chillers D-EIMWC00804-14EN
Figure 7, Heat Recovery Schematic
EVAPORATOR
TOWER
CONDENSER
RECOVERY
CONDENSER
AUXILIARY
HEATER
HEAT LOAD
TC
TC
COOLING
LOAD
OPEN
CIRCUIT
TOWER
HEAT RECOVERY
CHILLER
LEGEND
TC TEMPERATURE CONTROL POINT
PUMP

D-EIMWC00804-14EN Centrifugal Chillers 19
Field Insulation Guide
Figure 8, Insulation Requirements, Cooling-only Units

20 Centrifugal Chillers D-EIMWC00804-14EN

D-EIMWC00804-14EN Centrifugal Chillers 21
Physical Data and Weights
Evaporator
The standard insulation of cold surfaces includes the evaporator and non-connection water
head, suction piping, compressor inlet, motor housing, and motor coolant outlet line.
Insulation is UL recognized (File # E55475). It is 3/4" thick ABS/PVC flexible foam with a
skin. The K factor is 0.28 at 75°F. Sheet insulation is fitted and cemented in place forming a
vapor barrier, then painted with a resilient epoxy finish that resists cracking.
The insulation complies to, or has been tested in accordance, with the following:
ASTM-C-177 ASTM-C-534 Type 2 UL 94-5V
ASTM-D-1056-91-2C1 ASTM E 84 MEA 186-86-M Vol. N
CAN/ULC S102-M88
Refrigerant-side design pressure is 200 psi (1380 kPa) on DWSC/DWCC/DHSC units and 180
psi (1242 kPa) on DDWDC units. Water-side is 150 psi (1034 kPa) on all.
In the event insulation is to be field-installed, none of the cold surfaces identified above will be
factory insulated. Required field insulation is shown beginning on page 19. Approximate total
square footage of insulation surface required for individual packaged chillers is tabulated by
evaporator code and can be found below.
Table 2, Evaporator Physical Data
Evaporator
Code
DWSC DWDC DWCC
Refrigerant
Charge
lb. (kg)
Evaporator
Water
Capacity, gal (L)
Insulation
Area
Sq. Ft. (m
2
)
Vessel
Weight
lb. (kg)
Number
of Relief
Valves
E1809 X 434 (197) 37 (138) 75 (7.0) 2734 (1239) 1
E1812 X 347 (158) 27 (103) 78 (7.2) 2370 (1075) 1
E2009 X 561 (254) 34 (164) 82 (7.6) 3026 (1371) 1
E2012 X 420 (190) 37 9139) 84 (7.8) 2713 (1231) 1
E2209 X 729 (331) 54 (206) 66 (6.1) 3285 (1488) 1
E2212 X 500 (227) 45 (170) 90 (8.3) 2877 (1305) 1
E2212 X 645 (291) 63 (240) 90 (8.3) 3550 (1609) 1
E2216 X 1312 (595) 79 (301) 144 (13.4) 4200 (1903) 1
E2412 X 1005 (456) 88 (335) 131 (12.1) 4410 (1999) 1
E2416 X 1424 (646) 110 (415) 157 (14.6) 5170 (2343) 1
E2609 X 531 (249) 54 (295) 76 (7.1) 2730 (1238) 1
E2612 X 708 (321) 72 (273) 102 (9.4) 3640 (1651) 1
E2612 X 925 (418) 101 (381) 102 (9.4) 4745 (2150) 1
E2616 X 1542 (700) 126 (478) 162 (15.0) 5645 (2558) 1
E3009 X 676 (307) 67 (252) 86 (8.0) 3582 (1625) 1
E3012 X 901 (409) 89 (336) 115 (10.6) 4776 (2166) 1
E3016 X 2117 (960) 157 (594) 207 (19.2) 7085 (3211) 2
E3609 X 988 (720) 118 (445) 155 14.4) 5314 (2408) 1
E3612 X 1317 (597) 152 (574) 129 (11.9) 6427 (2915) 1
E3616 X 3320 (1506) 243 (918) 239 (22.2) 9600 (4351) 2
E3620 X 4150 (1884) 434 (1643) 330 (30.6) 12500 (5675) 2
E4212 X 1757 (797) 222 (841) 148 (13.7) 8679 (3937) 1
E4216 X 4422 (2006) 347 (1313) 264 (24.5) 12215 (5536) 2
E4220 X 4713 (2138) 481 (1819) 330 (30.6) 15045 (6819) 2
E4220 X 4713 (2138) 481 (1819) 330 (30.6) 15845 (7194) 2
E4812 X 2278 (1033) 327 (1237) 169 (15.6) 10943 (4964) 2
E4816 X 4690 (2128) 556 (2106) 302 (28.1) 16377 (7429) 2
E4820 X 5886 (2670) 661 (2503) 377 (35.0) 17190 (7791) 2
E4820 X 5886 (2670) 661 (2503) 377 (35.0) 18390 (8349) 2
1. Refrigerant charge is approximate since the actual charge will depend on other variables. Actual charge will be shown on the unit
nameplate.
2. Water capacity is based on standard tube configuration and standard dished heads.
3. The evaporator charge includes the maximum condenser charge available with that evaporator and is therefore the maximum charge
for a total unit with the evaporator. Actual charge for a specific selection can vary with tube count and can be obtained from the
Daikin Selection Program. The program will not allow a selection where the unit charge exceeds the condenser pumpdown capacity.