Daikin DWSC 079, DWSC 087, DWSC 100, DWSC 113, DWSC 126 Operation manuals

Original Instructions

Single/Dual Compressor Centrifugal Chillers – Vintage B

DWSC/DWDC 079, 087, 100, 113, 126, Cooling Only

REV

09

Date

January 2020

Supersedes

D-EIMC00808-16_08EN

Installation, Operation and Maintenance Manual

D-EIMWC00808-16_09EN

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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.

THIS MANUAL, WIRING DIAGRAMS AND DIMENSIONAL DRAWINGS MUST BE CONSIDERED ESSENTIALS,
KEEP A COPY OF THESE DOCUMENTS ALWAYS AVAILABLE INSIDE THE UNIT.

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.

The unit is made of metal, plastic and electronic parts. All of these components must be disposed of in accordance with local
disposal laws and if in scope with the national laws implementing the Directive 2012/19/EU (RAEE).
Lead batteries must be collected and sent to specific waste collection centres.
Avoid the escape of refrigerant gases into the environment by using suitable pressure vessels and tools for transferring the fluids
under pressure. This operation must be carried out by qualified personnel in refrigeration systems and in compliance with the
laws in force in the country of installation.

IMPORTANT

READ THIS DOCUMENT IN ITS ENTIRETY BEFORE BEGINNING ANY WORK ON THE UNIT.

ALL FEDERAL, STATE, LOCAL ENVIRONMENTAL AND SAFETY REGULATIONS INCLUDING DAIKIN

SAFETY RULES MUST BE FOLLOWED.

All appropriate Personal Protective Equipment (“PPE”) must be used, and a Job Hazard Analysis (“JHA”) must be completed,
before beginning any work on the unit.
Technicians performing this work must be properly trained on Daikin WSC, WDC, DWSC, DWDC Centrifugal equipment.

Important Note: In case of any procedure requires accessing the refrigerant circuit of these units, remember that refrigerant is under
pressure and oils are contained in these circuits.
Ensure that all appropriate pump-down or pump-out service valves are in the correct position, open or closed as required and
holding.
Solenoid valves and expansion valves can trap refrigerant and oils, these devices must be operated manually to release any trapped
gases and oils while in pump-down or pump-out operation.
All refrigerant lines and components of the unit must be evacuated to at least 30 kPa vacuum and verified before opening any
charging valves, venting schrader valves or testing ports.
These devices must be open and vented while accessing the refrigerant system. In some cases, cross connection lines may be
required to ensure recovery of all refrigerant in all sections of the affected system or components.

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CAUTION

All units are delivered from factory as complete sets which include wiring diagrams and dimensional drawings with

size, weight and features of each model.

In case of any discrepancy between this manual and the two aforesaid documents, please refer to the wiring diagram

and dimensional drawings.

Power Wiring

• Qualified and licensed electricians must perform wiring. Shock hazard exists.

• Connections to terminals must be made with copper lugs and copper wire.

• Before any installation and connection work, the system must be switched off and secured. After

switching off the unit, when an inverter is installed, the intermediate circuit capacitors of the inverter
are still charged with high voltage for 5 minutes.

• Before taking any action, switch off the main switch to cut off electricity to the machine.

When the machine is off but the disconnecting switch is in the closed position, unused circuits are always live.
Never open the terminal board box of the compressors unless the main switch of the machine has been switched off.

• The units of the series can be provided with non-linear high power electrical components (inverters)

which introduce higher harmonics, can cause considerable leakage to earth, (higher than 300 mA). The
electricity supply system protection must take the above values into account.

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.

• Commissioning of the unit (first start up) must be performed by Daikin representative

• It is absolutely forbidden to remove all the protections of the moving parts of the unit

• If the unit mounts suction and discharge valves they need to be secured in open position when the unit is installed,

by means of a lead seal or equivalent. This to avoid they are put in closed position. The use of this valve is
intended for compressor maintenance.

• If refrigerant charge of the unit is more than 500 kg it is necessary to install gas sensor on water circuit to catch

an eventual gas leakage.

• Verify that the unit has not zero pressure in the refrigerant circuit before charging water into the heat exchangers.

In case there is not pressure in the refrigerant circuit, do not charge water.

• Do not use oxygen or a mixture of R-22 and air to build up pressure as explosion can occur causing serious

personal injury.

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.

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The operator must strictly follow all instruction and limitation given for the unit.
The operator is not authorized to perform maintenance. Maintenance has to be performed only by trained technicians,

please contact DAIKIN representative.
The operator must apply all the safety standard regarding personal protective equipment and working tools.

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

Note concerning pressure equipment

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.

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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

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

8 – Label: unit under pressure

Compressor Control Panel

1 – Components layout

3 – Electrical hazard symbol

2 – Hazardous Voltage warning

4 – Compressor control panel code

8

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Motor Terminal Box

1 – Terminal box fixing

3 – Electrical hazard symbol

2 – Manufacturer’s logo

4 – Terminal connection

Label on Compressor

1 – Label: Device Under Pressure

1

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Table of Contents

Warnings for the operator ....................................................................................... Errore. Il segnalibro non è definito.

Introduction .................................................................................................................................... 10

General Description ........................................................................................................................................................10

Application .....................................................................................................................................................................10

Nomenclature ..................................................................................................................................................................10

Installation ...................................................................................................................................... 11

Receiving and Handling ................................................................................................................................................. 11

Location and Mounting ...................................................................................................................................................12

Operating/Standby Limits ...............................................................................................................................................12

Safety ..............................................................................................................................................................................13

System Water Volume .....................................................................................................................................................14

Low Condenser Water Temperature Operation ...............................................................................................................14

Water Piping ...................................................................................................................................................................16

Field Insulation Guide ....................................................................................................................................................20

Physical Data and Weights ..............................................................................................................................................22

Oil Coolers ......................................................................................................................................................................23

Oil Heater .......................................................................................................................................................................26

Relief Valves ...................................................................................................................................................................27

Electrical .........................................................................................................................................................................28

Power Wiring ................................................................................................ ................................................................ ..28

Remote Starter Display Wiring ................................................................................................................................ .......30

Control Power Wiring .....................................................................................................................................................30

Multiple Chiller Setup ....................................................................................................................................................35

Prestart System Checklist ...............................................................................................................................................38

Operation ........................................................................................................................................ 39

Operator Responsibilities ................................................................................................................................ ................39

Standby Power ................................................................................................................................................................39

MicroTech II Control ..................................................................................................................................................39

Capacity Control System ................................................................................................................................................40

Surge and Stall ................................................................................................................................................................43

Lubrication System .........................................................................................................................................................43

Hot Gas Bypass ..............................................................................................................................................................44

Condenser Water Temperature ........................................................................................................................................45

Maintenance ................................................................................................................................... 46

Pressure/Temperature Chart ............................................................................................................................................46

Routine Maintenance ................................................................................................................................ ......................47

Annual Shutdown ...........................................................................................................................................................51

Annual Startup ................................................................................................................................................................52

Repair of System ............................................................................................................................................................52

Oil Analysis ....................................................................................................................................................................56

Maintenance Schedule ................................................................................................................... 59

Service Programs ........................................................................................................................... 62

Operator Schools ............................................................................................................................ 63

Warranty Statement ...................................................................................................................... 64

Important information regarding the refrigerant used .............................................................. 65

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.

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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 are cooling-only.

In the DWSC, 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. Information in this manual referring
to all DWSC and DWDC units except where specifically noted.

The chillers use refrigerant R-134a (or R513A) to reduce the size and weight of the package compared to negative
pressure refrigerants, and since these refrigerants 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 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 family of 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 exist.

Nomenclature

D W D C 079

Centrifugal Compressor

Chiller Model, Based on

Impeller Diameter

W = Water-cooled

D = Dual Compressor
S = Single Compressor

D = Daikin

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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

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Figure 2, DWDC 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.

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) 55°C

• WSC 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)

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

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Minimum entering condenser water temperature, operating: see page 14.
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.

- 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.

- A mechanical 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.

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WARNING

If the unit mounts suction and discharge valves they need to be secured in open position when the

unit is installed, by means of a lead seal or equivalent. This to avoid they are put in closed position.
The use of this valve is intended for compressor maintenance.

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.

Daikin centrifugal chillers all across the range 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.

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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

• DTFL = 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.

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.

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.

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

ECWT, F

Percent Load

Minimum Entering Condenser Water Temperature - 10 F Range

44
LChWT

42
LChWT

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Figure 5, Bypass, Mild Weather Operation

Water Piping

WARNING

If refrigerant charge of the unit is more than 500 kg it is necessary to install gas sensor on
water circuit to catch an eventual gas leakage.

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.

Figure 4, Bypass, Cold Weather Operation

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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 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 freeze­up 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.

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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 14, Field Wiring Diagram on page 34. 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. A segmented 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 14, Field Wiring Diagram on page 34.

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.

Flow direction marked
on switch

I in. (25mm) NPT flow
switch connection

Tee

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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 14, Field Wiring Diagram on page 34 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.

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Field Insulation Guide

Figure 7, Insulation Requirements, Cooling-only Units

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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 units and 180 psi (1242 kPa) on DWDC units. Water­side 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 20. 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

Refrigerant

Charge

lb. (kg)

Evaporator

Water

Capacity, gal

(L)

Insulation

Area

Sq. Ft. (m2)

Vessel Weight

lb. (kg)

Number of

Relief Valves

E2209

X 729 (331)

54 (206)

66 (6.1)

3285 (1488)

2

E2212

X 500 (227)

45 (170)

90 (8.3)

2877 (1305)

2

E2212

X 645 (291)

63 (240)

90 (8.3)

3550 (1609)

2

E2216

X 1312 (595)

79 (301)

144 (13.4)

4200 (1903)

4

E2412

X 1005 (456)

88 (335)

131 (12.1)

4410 (1999)

2

E2416

X 1424 (646)

110 (415)

157 (14.6)

5170 (2343)

4

E2609

X 531 (249)

54 (295)

76 (7.1)

2730 (1238)

2

E2612

X 708 (321)

72 (273)

102 (9.4)

3640 (1651)

2

E2612

X 925 (418)

101 (381)

102 (9.4)

4745 (2150)

2

E2616

X 1542 (700)

126 (478)

162 (15.0)

5645 (2558)

4

E3009

X 676 (307)

67 (252)

86 (8.0)

3582 (1625)

2

E3012

X 901 (409)

89 (336)

115 (10.6)

4776 (2166)

2

E3016

X 2117 (960)

157 (594)

207 (19.2)

7085 (3211)

4

E3609

X 988 (720)

118 (445)

155 14.4)

5314 (2408)

2

E3612

X 1317 (597)

152 (574)

129 (11.9)

6427 (2915)

4

E3616

X 3320 (1506)

243 (918)

239 (22.2)

9600 (4351)

4

E3620

4150 (1884)

434 (1643)

330 (30.6)

12500 (5675)

2

E4212

X 1757 (797)

222 (841)

148 (13.7)

8679 (3937)

4

E4216

X 4422 (2006)

347 (1313)

264 (24.5)

12215 (5536)

4

E4220

X 4713 (2138)

481 (1819)

330 (30.6)

15045 (6819)

6

E4812

X 2278 (1033)

327 (1237)

169 (15.6)

10943 (4964)

4

E4816

X 4690 (2128)

556 (2106)

302 (28.1)

16377 (7429)

6

E4820

X 5886 (2670)

661 (2503)

377 (35.0)

17190 (7791)

6

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.

Condenser

With positive pressure systems, the pressure variance with temperature is always predictable, and the vessel design and
relief protection are based upon pure refrigerant characteristics. R-134a requires ASME vessel design, inspection and
testing and uses spring-loaded pressure relief valves. When an over pressure condition occurs, spring-loaded relief
valves purge only that refrigerant required to reduce system pressure to their set pressure, and then close.

D–EIMWC00808-16HU - 23/64

Refrigerant side design pressure is 200 psi (1380 kPa) on DWSC units and 225 psi (1552 kPa) on DWDC units. Water
side design is 150 psi (1034 kPa) on all.

Pumpdown

To facilitate compressor service, all Daikin centrifugal chillers are designed to permit pumpdown and isolation of the

entire refrigerant charge in the unit’s condenser. Dual compressor units and single compressor units equipped with the

optional suction shutoff valve can also be pumped down into the evaporator.

Table 3, Condenser Physical Data

Condenser

Code

DWSC

DWDC

Pumpdown

Capacity

lb. (kg)

Water

Capacity

gal. (L)

Vessel Weight

lb. (kg)

Number of

Relief Valves

C1609

X 468 (213)

33 (125)

1645 (746)

2

C1612

X 677 (307)

33 (123)

1753 (795)

2

C1809

X 597 (271)

43 (162)

1887 (856)

2

C1812

X 845 (384)

44 (166)

2050 (930)

2

C2009

X 728 (330)

47 (147)

1896 (860)

2

C2012

X 971 (440)

62 (236)

2528 (1147)

2

C2209

X 822 (372)

73 (278)

2596 (1169)

2

C2212

X 1183 (537)

76 (290)

2838 (1287)

2

C2212

X 1110 (504)

89 (337)

3075 (1395)

2

C2216

X 1489 (676)

114 (430)

3861 (1751)

2

C2416

X 1760 (799)

143 (540)

4647 (2188)

2

C2609

X 1242 (563)

83 (314)

2737 (1245)

2

C2612

X 1656 (751)

111 (419)

3650 (1660)

2

C2616

X 2083 (945)

159 (603)

5346 (2425)

2

C3009

X 1611 (731)

108 (409)

3775 (2537)

2

C3012

X 2148 (975)

144 (545)

5033 (3383)

2

C3016

X 2789 (1265)

207 (782)

6752 (3063)

4

C3612

X 2963 (1344)

234 (884)

7095 (3219)

4

C3616

X 3703 (1725)

331 (1251)

9575 (4343)

4

C3620

4628 92100)

414 (1567)

12769 (5797)

4

C4212

X 3796 (1722)

344 (1302)

9984 (4529)

4

C4216

X 5010 (2273)

475 (1797)

12662 (5743)

4

C4220

X 5499 (2494)

634 (2401)

17164 (7785)

4

C4812

X 4912 (2228)

488 (1848)

12843 (5826)

4

C4816

X 5581 (2532)

717 (2715)

18807 (8530)

4

C4820

X 7034 (3191)

862 (3265)

23106 (10481)

6

1. Condenser pumpdown capacity based on 90% full at 90F.

2. Water capacity based on standard configuration and standard heads and can be less with lower tube counts.

3. See Relief Valves section for additional information.

Compressor

Table 4, Compressor Weights

Compressor Size 

079

087

100

113

126

Weight lb. (kg) 

3200 (1440)

3200 (1440)

6000 (2700)

6000 (2700)

6000 (2700)

Oil Coolers

Daikin centrifugal chillers, sizes 079 through 126, have a factory-mounted, water-cooled oil cooler, temperature­controlled water regulating valve and solenoid valve per compressor.

DWSC single compressor cooling water connections are located near the compressor and are shown on the specific unit
certified drawings. Also see Figure 10 on page 26. Dual compressor chillers, DWDC/ 079 - 126 are equipped as above,
but the water piping for the two oil coolers is factory-piped to a common inlet and outlet connection located in the tube
sheet under the evaporator. The exception to this is the DWDC 100 and 126 with 16-foot shells, where the common
connections are centered at the rear of the unit. See Figure 11 on page 26.

D–EIMWC00808-16HU - 24/64

Field water piping to the inlet and outlet connections must be installed according to good piping practices and include
stop valves to isolate the cooler for servicing. A cleanable filter (40 mesh maximum), and drain valve or plug must also
be field-installed. The water supply for the oil cooler should be from the chilled water circuit or from a clean,
independent source, no warmer than 80F (27C), such as city water. When using chilled water, it is important that the
water pressure drop across the evaporator is greater than the pressure drop across the oil cooler or insufficient oil cooler
flow will result. If the pressure drop across the evaporator is less than the oil cooler, the oil cooler must be piped across
the chilled water pump, provided that its pressure drop is sufficient. The water flow through the oil cooler will be
adjusted by the unit's regulating valve so that the temperature of oil supplied to the compressor bearings (leaving the oil
cooler) is between 95F and 105F (35C and 40C).

Table 5, DWSC, Oil Cooler Data

Table 6, DWSC with Mounted VFD, Oil Cooler Data

1. DWDC dual compressor units will have twice the cooling water flow rate of the comparable DWSC chiller and the

pressure drop will be the same.

2. Pressure drops include valves on the unit.

Table 7, Freestanding VFD, Cooling Requirements

Cooling

Water

Cooling

Water

Cooling

Water

Cooling

Water

DWSC/DHSC 079 - 087

Flow, gpm

1.5

1.0

0.9

0.7

Inlet Temperature, F

80.0

65.0

55.0

45.0

Outlet Temperature, F

114

114

114

114

Pressure Drop, ft.

13.0

6.8

4.8

3.6

DWSC/DHSC 100 - 126

Flow, gpm

2.5

1.9

1.5

1.3

Inlet Temperature, F

80.0

65.0

55.0

45.0

Outlet Temperature, F

114

114

114

114

Pressure Drop, ft.

25.2

15.7

11.4

9.3

Cold Side Water

DWSC/DHSC 079 - 087

Flow, gpm

11.9

2.9

2.0

1.54

Inlet Temperature, F

80.0

65.0

55.0

45.0

Outlet Temperature, F

87.3

94.5

98.4

101.5

Pressure Drop, ft.

9.9

0.6

0.3

0.2

DWSC/DHSC 100 - 126

Flow, gpm

21.9

5.1

3.5

2.7

Inlet Temperature, F

80.0

65.0

55.0

45.0

Outlet Temperature, F

87.0

95.0

99.1

102.4

Pressure Drop, ft.

8.7

0.5

0.2

0.1

Cold Side Water

DWSC/DHSC 079 - 087

Flow, gpm

13.4

4.0

2.9

2.3

Inlet Temperature, F

80.0

65.0

55.0

45.0

Outlet Temperature, F

90.3

99.6

103.1

105.6

Pressure Drop, ft.

30.5

6.7

4.8

3.6

DWSC/DHSC 100 - 126

Flow, gpm

24.4

7.0

5.0

4.0

Inlet Temperature, F

80.0

65.0

55.0

45.0

Outlet Temperature, F

89.8

100.1

103.6

106.2

Pressure Drop, ft.

30.6

15.7

11.4

9.3

NOTES:

D–EIMWC00808-16HU - 25/64

Compressors using chilled water for oil cooling will often start with warm "chilled water" in the system until the chilled
water loop temperature is pulled down. Data given above includes that condition. As can be seen, with cooling water
in the 45F to 65F (7C to 18C) range, considerably less water will be used, and the pressure drop will be greatly
reduced.

When supplied with city water, the oil piping must discharge through a trap into an open drain to prevent draining the
cooler by siphoning. The city water can also be used for cooling tower makeup by discharging it into the tower sump
from a point above the highest possible water level.

NOTE: Particular attention must be paid to chillers with variable chilled water flow through the evaporator.
The pressure drop available at low flow rates can very well be insufficient to supply the oil cooler with enough

water. In this case an auxiliary booster pump can be used or city water employed.

Figure 8, Oil Cooler Piping Across Chilled Water Pump

Figure 9, Oil Cooler Piping With City Water

CHILLER

OIL COOLER

STOP

VALVE

STRAINER

MAX. 40 MESH

SOLENOID

VALVE

DRAIN VALVE
OR PLUG

STOP
VALUE

PUMP

R

S

COOLING TOWER

OPEN
DRAIN

DRAIN VALVE

OR PLUG

SOLENOID

VALVE

OIL COOLER

WATER
SUPPLY

STOP

VALVE

STRAINER

MAX. 40

MESH

COOLING TOWER MAKEUP
DISCHARGE ABOVE
HIGHEST POSSIBLE
WATER LEVEL

R

S

D–EIMWC00808-16HU - 26/64

Figure 10, Oil Cooler Connections, DWSC Units

Figure 11, Oil Cooler Connections, DWDC 100/126, 16 Foot Shells

Table 8, Cooling Water Connection Sizes

Model

DWSC 079-087,

DWDC 079-087,
DWSC 100-126

DWDC 100-126

Conn Size (in.)

¾ in.

1 in.

1 ½ in.

Oil Heater

The oil sump is equipped with an immersion heater that is installed in a tube so that it can be removed without disturbing
the oil.

Oil

Reservoir

Solenoid Valve

Temperature

Control Valve

Compressor
Controller & Lub

Inlet Connection
(Inside)

Outlet Connection
(Outside)

Solenoid Valves

Temperature

Control Valves

Inlet Connection

Outlet Connection

Note:

All other DWDC units

have oil cooler

connections located on

the right hand tube

sheet under the

evaporator.

D–EIMWC00808-16HU - 27/64

Relief Valves

As a safety precaution and to meet code requirements, each chiller is
equipped with pressure relief valves located on the condenser,
evaporator, and oil sump vessel for the purpose of relieving excessive
refrigerant pressure (caused by equipment malfunction, fire, etc.) to the
atmosphere. Most codes require that relief valves be vented to the
outside of a building, and this is a desirable practice for all installations.
Relief piping connections to the relief valves must have flexible
connectors.

Note: Remove plastic shipping plugs (if installed) from the

inside of the valves prior to making pipe connections. Whenever
vent piping is installed, the lines must be run in accordance with
local code requirements; where local codes do not apply, the
latest issue of ANSI/ASHRAE Standard 15 code

recommendations must be followed.

Condensers have two relief valves as a set with a three-way valve
separating the two valves (large condensers will have two such sets).
One valve remains active at all times and the second valve acts as a
standby.

Figure 12, Condenser 3-Way Valve

Refrigerant Vent Piping

Relief valve connection sizes are one-inch FPT and are in the quantity shown in Table 2 and Table 3 on page 22. Twin
relief valves mounted on a transfer valve are used on the condenser so that one relief valve can be shut off and removed,
leaving the other in operation. Only one of the two is in operation at any time. Where four valves are shown in the
table, they consist of two valves, each mounted on two transfer valves. Only two relief valves of the four are active at
any time.

Vent piping is sized for only one valve of the set since only one can be in operation at a time. In no case would a
combination of evaporator and condenser sizes require more refrigerant than the pumpdown capacity of the condenser.
Condenser pumpdown capacities are based on the current ANSI/ASHRAE Standard 15 that recommend 90% full at
90°F (32C). To convert values to the older ARI standard, multiply pumpdown capacity by 0.888.

Sizing Vent Piping (ASHRAE Method)

Relief valve pipe sizing is based on the discharge capacity for the given evaporator or condenser and the length of piping
to be run. Discharge capacity for R-134a vessels is calculated using a complicated equation that accounts for equivalent
length of pipe, valve capacity, Moody friction factor, pipe ID, outlet pressure and back pressure. The formula, and tables
derived from it, is contained in ASHRAE Standard 15-2001.

D–EIMWC00808-16HU - 28/64

Daikin centrifugal units have relief valve settings of 180 psi, 200 psi, and 225 psi, and resultant valve discharge capacities
of 68.5 # air/min, 75.5 # air/min, and 84.4 # air/min respectively.

Using the ASHRAE formula and basing calculations on the 225 psi design yields a conservative pipe size, which is
summarized in Table 9. The table gives the pipe size required per relief valve. When valves are piped together, the
common piping must follow the rules set out in the following paragraph on common piping.

Table 9. Relief Valve Piping Sizes

Equivalent length (ft)

2.2

18.5

105.8

296.7

973.6

4117.4

Pipe Size inch (NPT)

1 1/4

1 ½ 2 2 1/2 3 4

Moody Factor

0.0209

0.0202

0.0190

0.0182

0.0173

0.0163

NOTE: A 1-inch pipe is too small for the flow from the valves. A pipe increaser must always be installed at the valve outlet.

Common Piping

According to ASHRAE Standard 15, the pipe size cannot be less than the relief valve outlet size. The discharge from
more than one relief valve can be run into a common header, the area of which cannot be less than the sum of the areas
of the connected pipes. For further details, refer to ASHRAE Standard 15. The common header can be calculated by
the formula:

D

Common

D D D

n

= +











1

2

2

2 2

05

....

.

The above information is a guide only. Consult local codes and/or latest version of ASHRAE Standard 15 for sizing
data.

Electrical

Wiring, fuse and wire size must be in accordance with the National Electric Code (NEC). Standard NEMA motor
starters require modification to meet Daikin specifications. Refer to Daikin Specification R35999901 or Daikin Product
Manual PM DWSC/DWDC.

Important: Voltage unbalance not to exceed 2% with a resultant current unbalance of 6 to 10 times the voltage
unbalance per NEMA MG-1, 1998 Standard. This is an important restriction that must be adhered to.

Power Wiring

WARNING

Qualified and licensed electricians must perform wiring. Shock hazard exists.

Power wiring to compressors must be in proper phase sequence. Motor rotation is set up for clockwise rotation facing
the lead end with phase sequence of 1-2-3. Care must be taken that the proper phase sequence is carried through the
starter to compressor. With the phase sequence of 1-2-3 and L1 connected to T1 and T6, L2 connected to T2 and T4,
and L3 connected to T3 and T5, rotation is proper. See diagram in terminal box cover.

The Daikin start-up technician will determine the phase sequence.

CAUTION

Connections to terminals must be made with copper lugs and copper wire.

Care must be taken when attaching leads to compressor terminals.

CAUTION

Before any installation and connection work, the system must be switched off and secured. After

switching off the unit, when an inverter is installed, the intermediate circuit capacitors of the

inverter are still charged with high voltage for a short period of time. The unit can be worked on

again after it has been switched of for 5 minutes.

D–EIMWC00808-16HU - 29/64

CAUTION

Before taking any action, switch off the main switch to cut off electricity to the machine.

When the machine is off but the disconnecting switch is in the closed position, unused circuits are

always live.

Never open the terminal board box of the compressors unless the main switch of the machine has been

switched off.

CAUTION

The units of the series can be provided with non-linear high power electrical components

(inverters) which introduce higher harmonics, can cause considerable leakage to earth, (higher than 300

mA).

The electricity supply system protection must take the above values into account.

Note: Do not make final connections to motor terminals until wiring has been checked and approved by a

Daikin technician.

Under no circumstances should a compressor be brought up to speed unless proper sequence and rotation have been
established. Serious damage can result if the compressor starts in the wrong direction. Such damage is not covered by
product warranty.

It is the installing contractor's responsibility to insulate the compressor motor terminals when the unit voltage is 600
volts or greater. This is to be done after the Daikin start-up technician has checked for proper phase sequence and motor
rotation.

Following this verification by the Daikin technician, the contractor should apply the following furnished items.

Materials required:

1. Loctite brand safety solvent (12 oz. package available as Daikin part number 350A263H72)

2. 3M Co. Scotchfil brand electrical insulation putty (available in a 60-inch roll as Daikin part number

350A263H81)

3. 3M Co. Scotchkote brand electrical coating (available in a 15 oz. can with brush as Daikin Part Number

350A263H16)

4. Vinyl plastic electrical tape

The above items are also available at most electrical supply outlets.

Application procedure:

1. Disconnect and lock out the power source to the compressor motor.

2. Using the safety solvent, clean the motor terminals, motor barrel adjacent to the terminals, lead lugs, and

electrical cables within the terminal 4OX to remove all dirt, grime, moisture and oil.

3. Wrap the terminal with Scotchfil putty, filling in all irregularities. The final result should be smooth and

cylindrical.

4. Doing one terminal at a time, brush the Scotchkote coating on the motor barrel to a distance of up to '/2"

around the terminal and on the wrapped terminal, the rubber insulation next to the terminal, and the lug and
cable for approximately 10". Wrap additional Scotchfil insulation over the Scotchkote coating.

5. Tape the entire wrapped length with electrical tape to form a protective jacket.

6. Finally, brush on one more coat of Scotchkote coating to provide an extra moisture barrier.

D–EIMWC00808-16HU - 30/64

Remote Starter Display Wiring

Remote mounted Wye-Delta, solid state, and across-the-line starters require field
wiring to activate the optional ammeter display or the full metering display on the

chiller’s operator interface panel. The wiring is from the D3 board in the starter to

the compressor controller and to the bias block; both located in the compressor
control panel.

Figure 13, Field Wiring for Optional Display

Control Power Wiring

The control circuit on the Daikin centrifugal packaged chiller is designed for 115-volts. Control power can be supplied
from three different sources:

1. If the unit is supplied with a factory-mounted starter or VFD, the control circuit power supply is factory-wired

from a transformer located in the starter or VFD.

Wiring Connection on Starter for Optional Display

D–EIMWC00808-16HU - 31/64

2. A freestanding starter or VFD furnished by Daikin, or by the customer to Daikin specifications, will have a

control transformer in it and requires field wiring to terminals in the compressor terminal box.

3. Power can be supplied from a separate circuit and fused at 20 amps inductive load. The control circuit

disconnect switch must be tagged to prevent current interruption. Other than for service work, the switch is

to remain on at all times in order to keep oil heaters operative and prevent refrigerant from diluting in
oil.

DANGER

If a separate control power source is used, the following must be done to avoid severe personal injury or

death from electrical shock:

1. Place a notice on the unit that multiple power sources are connected to the unit.

2. Place a notice on the main and control power disconnects that another source of power to the unit
exists.

In the event a transformer supplies control voltage, it must be rated at 3 KVA, with an inrush rating of 12 KVA minimum
at 80% power factor and 95% secondary voltage. For control wire sizing, refer to NEC. Articles 215 and 310. In the
absence of complete information to permit calculations, the voltage drop should be physically measured.

Table 10, Control Power Line Sizing

Maximum Length, ft (m)

Wire Size (AWG)

Maximum Length, ft (m)

Wire Size (AWG)

0 (0) to 50 (15.2)

12

120 (36.6) to 200 (61.0)

6

50 (15.2) to 75 (22.9)

10

200 (61.0) to 275 (83.8)

4

75 (22.9) to 120 (36.6)

8

275 (83.8) to 350 (106.7)

3

Notes:

1. Maximum length is the distance a conductor will traverse between the control power source and the unit control
panel.

2. Panel terminal connectors will accommodate up to number 10 AWG wire. Larger conductors will require an
intermediate junction box.

The Unit On/Off switch located in the Unit Control Panel should be turned to the "Off" position any time compressor
operation is not desired.

Wiring for Optional BAS Interface

The optional Building Automation System (BAS) interface utilizing the MicroTech II unit controller’s Protocol
Selectability feature is field wired and will be set-up by the Daikin startup service technician. The following manuals
explain the wiring and mounting procedures:

LONWORKS > IM 735
BACnet > IM 736
MODBUS > IM 743

Flow Switches

Water flow interlock terminals are provided on the Unit Control Panel terminal strip for field-mounted switches. See
the Field Wiring Diagram on page 34 or on the cover of the control panel for proper connections. The purpose of the
water flow interlocks is to prevent compressor operation until such time as both the evaporator water and condenser
water pumps are running and flow is established. If flow switches are not furnished factory-installed and wired, they
must be furnished and installed by others in the field before the unit can be started.

System Pumps

Operation of the chilled water pump can be to 1) cycle the pump with the compressor, 2) operate continuously, or 3)
start automatically by a remote source.

The cooling tower pump must cycle with the machine. The holding coil of the cooling tower pump motor starter must
be rated at 115 volts, 60 Hz, with a maximum volt-amperage rating of 100. A control relay is required if the voltage­amperage rating is exceeded. See the Field Wiring Diagram on page 34 or in the cover of control panel for proper
connections.

D–EIMWC00808-16HU - 32/64

All interlock contacts must be rated for no less than 10 inductive amps. The alarm circuit provided in the control center
utilizes 115-volts AC. The alarm used must not draw more than 10 volt amperes.

See OM CentriMicro II for MicroTech II unit controller details.

Control Panel Switches

Three On/Off switches are located in the upper left corner of the main Unit Control Panel, which is adjacent to the
operator interface panel, and have the following function:

• UNIT shuts down the chiller through the normal shutdown cycle of unloading the compressor(s) and provides a

post-lube period.

• COMPRESSOR one switch for each compressor on a unit, executes an immediate shutdown without the normal

shutdown cycle.

• CIRCUIT BREAKER disconnects optional external power to system pumps and tower fans.

A fourth switch located on the left outside of the Unit Control Panel and labeled EMERGENCY STOP SWITCH stops
the compressor immediately. It is wired in series with the COMPRESSOR On/Off switch.

Surge Capacitors

All units (except those with solid state starters or VFDs) are supplied with standard surge capacitors to protect
compressor motors from electrical damage resulting from high voltage spikes.

• For unit-mounted starters, the capacitors are factory-mounted and wired in the starter enclosure.

• For free-standing starters, the capacitors are mounted in the motor terminal box and must be connected to the

motor terminals with leads less than 18 inches (460 mm) long when the motor is being wired.

NOTES for Following Wiring Diagram

1. Compressor motor starters are either factory mounted and wired, or shipped separate for field mounting and

wiring. If provided by others, starters must comply with Daikin specification 359AB99. All line and load side

power conductors must be copper.

2. If starters are freestanding, then field wiring between the starter and the control panel is required. Minimum

wire size for 115 Vac is 12 GA for a maximum length of 50 feet. If greater than 50 feet, refer to Daikin for
recommended wire size minimum. Wire size for 24 Vac is 18 GA. All wiring to be installed as NEC Class 1
wiring system. All 24 Vac wiring must be run in separate conduit from 115 Vac wiring. Main power wiring
between starter and motor terminal is factory-installed when units are supplied with unit-mounted starters.
Wiring of free-standing starter must be wired in accordance with NEC and connection to compressor motor
terminals must be made with copper wire and copper lugs only. Control wiring on free-standing starters is
terminated on a terminal strip in the motor terminal box (not the unit control panel). Wiring from the unit

control panel to the motor terminal is done in the factory.

3. For optional sensor wiring, see unit control diagram. It is recommended that DC wires be run separately from
115 Vac wiring.

4. Customer furnished 24 or 120 Vac power for alarm relay coil can be connected between UTB1 terminals 84

power and 51 neutral of the control panel. For normally open contacts, wire between 82 & 81. For normally
closed contacts, wire between 83 & 81. The alarm is operator programmable. The maximum rating of the

alarm relay coil is 25 VA.

5. Remote on/off control of unit can be accomplished by installing a set of dry contacts between terminals 70
and 54.

6. Evaporator and condenser paddle type flow switches or water pressure differential switches are required and

must be wired as shown. If field supplied pressure differential switches are used then these must be installed

across the vessel and not the pump.

7. Customer supplied 115 Vac, 20 amp power for optional evaporator and condenser water pump control power
and tower fans is supplied to unit control terminals (UTBI) 85 power / 86 neutral, PE equipment ground.

8. Optional customer supplied 115 Vac, 25 VA maximum coil rated chilled water pump relay (EP 1 & 2) can be
wired as shown. This option will cycle the chilled water pump in response to building load.

D–EIMWC00808-16HU - 33/64

9. The condenser water pump must cycle with the unit. A customer supplied 115 Vac 25 VA maximum coil rated
condenser water pump relay (CP1 & 2) is to be wired as shown.

10. Optional customer supplied 115 Vac, 25 VA maximum coil rated cooling tower fan relays (CL - C4) can be
wired as shown. This option will cycle the cooling tower fans in order to maintain unit head pressure.

11. Auxiliary 24 Vac rated contacts in both the chilled water and condenser water pump starters must be wired as
shown.

12. For VFD, Wye-Delta, and solid state starters connected to six (6) terminal motors, the conductors between

the starter and motor carry phase current and their ampacity must be based on 58 percent of the motor rated
load amperes (RLA) times 1.25. Wiring of free-standing starter must be in accordance with the NEC and
connection to the compressor motor terminals shall be made with copper wire and copper lugs only. Main
power wiring between the starter and motor terminals is factory-installed when chillers are supplied with unit-

mounted starters.

13. Optional Protocol Selectability BAS interfaces. The locations and interconnection requirements for the

various standard protocols are found in their respective installation manuals, obtainable from the local Daikin

sales office and also shipped with each unit:

Modbus IM 743-0 LonWorks IM 735-0 BACnet IM 736-0

14. The “Full Metering” or “Amps Only Metering” option will require some field wiring when free-standing starters

are used. Wiring will depend on chiller and starter type. Consult the local Daikin sales office for information
on specific selections.

D–EIMWC00808-16HU - 34/64

Figure 14, Field Wiring Diagram

80

CP2

CP1

H

O

A

C4

H

A

O

C3

H

A

O

79

78

77

74

73

54

CF

86

EF

86

C

25

1
2

11
11
12
22

1

2

6
11
12
22

NOTE 2

NOTE 2

(115V) (24V)

25

55

70

H

A

O

H

A

O

H

O

A

C

H

O

A

C

H

O

A

C

C2

C1

T3-S

PE
L1
L2CP2

CP1

24

23(5A)

24(5)

23

3
4

3
4

76

75

PE
85

86

81

84

A

82(NO)
83(NC)

POWER

EP2

EP1

L1 L2 L3

GND

T4 T5 T6

T1 T2 T3

T4 T5 T6T1 T2 T3

T1 T2 T3

T3T1 T2

U V W

T4 T3 T5T1 T6 T2

T1 T2 T3

T4 T3 T5T1 T6 T2

GND

LESS
THAN
30V
OR
24VAC

53

71

71

52

1-10 VDC

1-10 VDC

MICROTECH CONTROL

BOX TERMINALS

* COOLING

TOWER

FOURTH

STAGE

STARTER

* COOLING

TOWER

THIRD

STAGE

STARTER

* COOLING

TOWER

SECONDH

STAGE

STARTER

* COOLING

TOWER

FIRST

STAGE

STARTER

COOLING TOWER

BYPASS VALVE

COOLING TOWER VFD

ALARM RELAY

(NOTE 4)

MICROTECH

COMPRESSOR CONTROL

BOX TERMINALS

CTB1

-LOAD-

COMPRESSOR

MOTOR

STARTER

(NOTE 1)

115 VAC

STARTER LOAD SIDE TERMINBALS

VFD

STARTER LOAD SIDE TERMINBALS

WYE-DELTA

STARTER LOAD SIDE TERMINBALS

SOLID STATE

STARTER LOAD SIDE TERMINBALS

MEDIUM AND HIGH VOLTAGE

COMPRESSOR TERMINALS

COMPRESSOR TERMINALS

COMPRESSOR TERMINALS

COMPRESSOR TERMINALS

NOTE 12

- FOR DC VOLTAGE AND 4-20 MA
CONNECTIONS (SEE NOTE 3)

- FOR DETAILS OF CONTROL REFER
TO UNIT CONTROL SCHEMATIC
330342101

- COMPRESSOR CONTROL
SCHEMATIC 330342201

- LEGEND: 330343001
* FIELD SUPPLIED ITEM

* NOTE 7

* NOTE 10

* NOTE 10

* NOTE 10

* NOTE 10

330387901-0A

COMMON

NEUTRAL

POWER

D–EIMWC00808-16HU - 35/64

Multiple Chiller Setup

Single compressor chillers DWSC and dual compressor chillers DWDC have their main control components factory
wired to an internal pLAN network so that the components can communicate with each other, within the chiller itself.

On multi-chiller applications, up to four chillers, either single, or dual compressor, can be interconnected by this internal
pLAN. All that is required is simple field RS485 interconnecting wiring, the addition of accessory communication
isolation board(s) 485OPDR (Daikin P/N 330276202), and some MicroTech II control settings. The 485OPDR isolation
board can be purchased with the unit or separately, during or after chiller installation. The number of chillers minus one
boards are required.

pLAN Setup

Interconnecting MicroTech II pLAN RS485 wiring should be installed by the installing contractor prior to start-up. The
Daikin start-up technician will check the connections and make the necessary set point settings.

1. With no pLAN connections between chillers, disconnect chiller control power and set the DIP switches as
shown in Table 11.

2. With all manual switches off, turn on control power to each chiller and set each OITS address (see Note 2 on
page 36).

3. Verify correct nodes on each OITS Service Screen.

4. Connect chillers together (pLAN, RS485 wiring) as shown in Figure 16. The first chiller in the connection can

be designated as Chiller A. The isolation board is attached to the DIN rail adjacent to the Chiller A unit
controller. The isolation board has a pigtail that is plugged into J10 on the controller. Most chillers will already
have a universal communication module (UCM) that connects the controller to the toucDHSCreen already
plugged onto J10. If this is the case, plug the isolation module pigtail into the empty RJ11 pLAN port on the

UCM. This is equivalent to plugging into the unit controller directly.
Next, interconnecting wiring is needed between Chiller A and Chiller B.

Two Chillers: If only two chillers are to be connected, Belden M9841 (RS 485 Spec Cable) is wired from the
485OPDR isolation board (terminals A, B, and C) on Chiller A to the J11 port on the unit controller of Chiller B.
At J11, the shield connects to GND, the blue/white wire to the (+) connection, and the white/blue to the (-)

connection.

Note that Chiller B does not have an isolation board. The last chiller (B in this case) to be connected does not

need an isolation board.

Three or More Chillers: If three or more chillers are to be connected, the interconnecting wiring is still made to
Chiller B’s J11 port. The second chiller (Chiller B) must have a 485OPDR isolator board that will be plugged

into Chiller B’s UCM pLAN port. Chiller B will look like Chiller A.

The wiring from Chiller B to Chiller C will be the same as A to B. That is, Belden cable connects from A, B,

and C on B’s 485OPDR board to chiller C’s L11 port. Chiller C has no 485OPDR isolation board.
The procedure is repeated to the fourth chiller if four chillers are interconnected.

5. Verify correct nodes on each OITS Service Screen.

D–EIMWC00808-16HU - 36/64

Figure 15, Communication Wiring

NOTE: A fourth chiller, Chiller D would be connected to chiller C same as chiller C to chiller B.

Table 11, Address DIP Switch Settings for Controllers Using pLAN.

Chiller

(1)

Comp 1

Controller

Comp 2

Controller

Unit

Controller

Reserved

Operator

Interface (2)

Reserved

A

1 2 5 6 7

8

100000

010000

101000

011000

111000

000100 B 9

10

13

14

15

16

100100

010100

101100

011100

111100

000010

C

17

18

21

22

23

24

100010

010010

101010

011010

111010

000110

D

25

26

29

30

31

32

100110

010110

101110

011110

111110

000001

NOTES:

1. Up to four single or dual compressors can be interconnected.

2. The Operator Interface Touch Screen (OITS) setting is not a DIP switch setting. The OITS address is

selected by selecting the ‘service’ set screen. Then, with the Technician level password active, select the
‘pLAN Comm’ button. Buttons A(7), B(15), C(23), D(31) will appear in the middle of the screen, then
select the letter for the OITS address for the chiller that it is on. Then close the screen. Note that A is the

default setting from the factory.

3. Six Binary Switches: Up is ‘On’, indicated by ‘1’. Down is ‘Off’, indicated by ‘0’.

Chiller A

PIGTAIL

485

OPDR

C

A

B

UCM

J10

J11

BLU/WHT

WHT/BLU

SHIELD

(+)

(-)

UNIT CONTROL

J11 PORT

Chiller B

485

OPDR

C

BLU/WHT

WHT/BLU

SHIELD

B

A

UCM

J10

PORT

Chiller C

(+)

(-)

J11 Port

UNIT CONTROL

UNIT CONTROL

P

P

P P

D–EIMWC00808-16HU - 37/64

MicroTech II Operator Interface Touch Screen (OITS) Settings

Settings for any type of linked multiple compressor operation must be made to the MicroTech II controller. Settings on
a dual compressor unit are made in the factory prior to shipment, but must be verified in the field before startup. Settings
for multiple chiller installations are set in the field on the Operator Interface Touch Screen as follows:

Maximum Compressors ON – SETPOINTS - MODES screen, Selection #10 ‘= 2 for a dual, 4 for 2 duals, 3 for three
separate, single compressor chillers, etc. If all compressors in the system are to be available as normal running
compressors, then the value entered in #10 should equal the total number of compressors. If any compressors are for
standby and not operated in normal rotation, they should not be included in the compressor count in Selection #10. The
Max Comp ON setting can be made in only one toucDHSCreen, the system will observe the highest number set on all
chillers-it is a global setting.

Sequence and Staging – SETPOINTS - MODES screen, Selection #12 & #14; #11 & #13. Sequence sets the sequence

in which compressors will start. Setting one or more compressors to “1” evokes the automatic lead/lag feature and is

the normal setting. The compressor with least starts will start first and the compressor with maximum hours will stop
first, and so on. Units with higher numbers will stage on in sequence.

The Modes setpoints will do several different types of operation (Normal, Efficiency, Standby, etc.) as described in the
operating manual.

The same Modes setting must be replicated on each chiller in the system.
Nominal Capacity – SETPOINTS - MOTOR screen, Selection #14. The setting is the compressor design tons.

Compressors on dual units are always of equal capacity.

Operating Sequence

For multiple-chiller, parallel operation, the MicroTech II controllers are tied together by a pLAN network and stage and
control compressor loading among the chillers. Each compressor, single or dual compressor chiller, will stage on or off

depending on the sequence number programmed into it. For example, if all are set to “1”, the automatic lead/lag will be

in effect.
When chiller #1 is fully loaded, the leaving chilled water temperature will rise slightly. When the Delta-T above setpoint

reaches the Staging Delta-T, the next chiller scheduled to start will receive a start signal and start its pumps if they are
set up to be controlled by the Microtech controller. This procedure is repeated until all chillers are running. The
compressors will load-balance themselves.

If any of the chillers in the group are dual compressor, they will stage and load according to the staging instructions.
See OM CentrifMicro II-3 for a complete description of the various staging sequences available.

D–EIMWC00808-16HU - 38/64

Prestart System Checklist

Yes No N/A
Chilled Water

Piping complete .................................................................................................................   

Water system filled, vented ...............................................................................................   

Pumps installed, (rotation checked), strainers cleaned ......................................................   

Controls (3-way, face and bypass dampers, bypass valves, etc.) operable ........................   

Water system operated and flow balanced to meet unit design requirements....................   

Condenser Water (*)

Cooling tower flushed, filled and vented ..........................................................................   

Pumps installed, (rotation checked), strainers cleaned .....................................................   

Controls (3-way, bypass valves, etc.) operable .................................................................   

Water system operated and flow balanced to meet unit requirements ..............................   

Electrical

115-volt service completed, but not connected to control panel .......................................   

Power leads connected to starter; load leads run to compressor ready for

connection when service engineer is on hand for start-up .............................................   

(Do not connect starter or compressor terminals)

All interlock wiring complete between control panel and complies with specifications ..   

Starter complies with specifications .................................................................................   

Pump starters and interlock wired ....................................................................................   

Cooling tower fans and controls wired .............................................................................   

Wiring complies with National Electrical Code and local codes ......................................   

Condenser pump starting relay (CWR) installed and wired .............................................   

Miscellaneous

Oil cooler water piping complete (units with water cooled oil coolers only) ...................   

Relief valve piping complete ............................................................................................   

Thermometer wells, thermometers, gauges, control wells, controls, etc., installed ..........   

Minimum system load of 80% of machine capacity available for testing

and adjusting controls .......................................................................................................   

(*) Includes heating hot water on heat recovery units.

Note: This checklist must be completed and sent to the local Daikin service location two weeks prior to

start-up.

D–EIMWC00808-16HU - 39/64

Operation

Operator Responsibilities

It is important that the operator become familiar with the equipment and the system before attempting to operate the
chiller. In addition to reading this manual, the operator should study operation manual OM CentrifMicro II (latest
edition) and the control diagram furnished with the unit before starting, operating, or shutting it down.

During the initial startup of the chiller the Daikin technician will be available to answer any questions and instruct in the
proper operating procedures.

It is recommended that the operator maintain an operating log for each individual chiller unit. In addition, a separate
maintenance log should be kept of the periodic maintenance and servicing activities.

This Daikin centrifugal chiller represents a substantial investment and deserves the attention and care normally given to
keep this equipment in good working order. If the operator encounters abnormal or unusual operating conditions, it is
recommended that a Daikin service technician be consulted.

Daikin conducts training for centrifugal operators at its factory Training Center in Staunton, Virginia, several times a
year. These sessions are structured to provide basic classroom instruction and include hands-on operating and
troubleshooting exercises. For further information, contact your Daikin representative.

Standby Power

It is essential that any centrifugal chiller connected to standby power come to a complete stop on grid power and then
be restarted with the standby power. Attempting to switch from regular grid line power to auxiliary power while the
compressor is running can result in extreme transient torque that will severely damage the compressor.

MicroTech II Control

All chillers are equipped with the Daikin MicroTech II control system consisting of:

• Operator toucDHSCreen interface panel (shown at the left). It consists of a 12-inch Super VGA color screen

and a floppy drive. See Figure 16.

• Unit Control Panel containing the MicroTech II unit controller and miscellaneous switches and field

connection terminals.

• Compressor Control Panel for each compressor containing the MicroTech II compressor controller and lube

system control components.

Figure 16, MicroTech II Control Panel

NOTE: Detailed information on the operation of the MicroTech II control is contained in the OM CentrifMicro

II operating manual.

D–EIMWC00808-16HU - 40/64

Figure 17, Unit Control Panel

Figure 18, Compressor Control Panel

D–EIMWC00808-16HU - 41/64

Capacity Control System

The opening or closing of the inlet vanes controls the quantity of refrigerant entering the impeller thereby controlling
the compressor capacity. The vane movement occurs in response to oil flow from the SA or SB 4-way solenoid valves,
which in turn, respond to instructions from the unit microprocessor as it senses leaving chilled water temperature. This
oil flow activates a sliding piston that rotates the vanes.

Vane Operation

The hydraulic system for the inlet guide vane capacity control operation consists of a 4-way normally open solenoid
valve located in the oil management control panel or on the compressor close to the suction connection. Oil under
pressure from the oil filter is directed by the 4-way valve to either or both sides of the piston, depending on whether the
control signal is to load, unload, or hold.

To open the vanes (loading compressor), solenoid SA is de-energized and SB is energized, allowing oil flow from port
SA to one side of the piston. The other side drains through port SB.

To close the vanes (unload compressor), valve SB is de-energized and valve SA is energized to move the piston and
vanes toward the unload position.

When both solenoid valves SA and SB are de-energized, full oil pressure is directed to both sides of the piston through
ports SA and SB, and the vanes are held in that position. Refer to Figure 21 and Figure 22 for solenoid action. Note
that both solenoids cannot be energized simultaneously.

Vane Speed Metering Valves

The speed at which the capacity control vanes are opened or closed can be adjusted to suit system operating requirements.
Adjustable needle valves in the oil drain lines are used to control the rate of bleed-off and consequently the “vane speed”.
These needle valves are part of the 4-way solenoid valve assembly located in the compressor lube box (Figure 20).

The valves are normally factory set so that the vanes will move from fully closed to fully opened in the time periods
shown in Table 12 on page 41.

Figure 19, Needle Valve Location

The speed must be slow enough to prevent over­controlling and hunting.

The left adjusting screw is the SB needle valve for
adjusting the vane OPENING speed for loading the
compressor. Turn this screw clockwise to decrease the
vane opening speed and counterclockwise to increase
the opening speed.

The right adjusting screw is the SA needle valve for
adjusting the CLOSING speed to unload the
compressor. The same adjustment method applies;
clockwise to decrease closing, counterclockwise to
increase vane closing.

These adjustments are sensitive. Turn the adjusting
screws a few degrees at a time.

The vane speed is factory set and varies by compressor
size.

The start-up technician may readjust the vane speed at
initial start-up to meet job conditions.

Table 12, Vane Speed Factory Setting

Compressor Model

Opening Time

Closing Time

CE079 - CE100

3 - 5 min.

1 - 2 min

CE126

5 - 8 min.

1 - 2 min.

Open (Load)

Close (Unload)

D–EIMWC00808-16HU - 42/64

Figure 20, Oil Sump and Compressor Controller Panel

Figure 21, Vane Control Solenoid Operation

Compressor
Unloader
Cylinder

Floating Piston Linked to Inlet Vanes

Opens Vanes
Closes Vanes

Four-Way Solenoid

Valve Located on

Compressor or

in Lube Box

Piston Drain

#3 Outlet

SB

SA

#1 Inlet

LEGEND

Oil Under Pressure

To Oil
Pump Sump

Section “SB”

De-energized

Section “SA”

De-energized

From Oil
Pump Discharge

Adjustable Needle Valves

Integral With Four-Way

Solenoid Valve

HOLDING

NOTE: 4-way solenoid valve and vane close switches are located on the compressor

suction inlet. The mechanical high-pressure cutout is located in the discharge line.

Oil Pump

Contactor

Oil Pump

Capacitor

Compressor
MicroTech II

controller

Cooling

Water Inlet

Cooling

Water Outlet

Temperature

Control Valve

Solenoid

Valve

Oil Sump

Relief Valve

Back Seat Port

D–EIMWC00808-16HU - 43/64

Figure 22, Vane Control Solenoid Operation, Continued

Surge and Stall

Stall and surge are a characteristic of all centrifugal compressors. These conditions occur when low load combines
with high compressor lift. In a stall, discharge gas has insufficient velocity leaving the impeller to reach the volute

and just “sits” or stalls in the diffuser section. The compressor sound level goes way down due to no flow and the

impeller starts to heat up. In surge, the heated discharge gas alternately flows back through the impeller and then
reverses to the volute about every two seconds. Extreme noise and vibration occur. The compressor is equipped
with a temperature sensor that shuts it off if these conditions occur.

Lubrication System

The lubrication system provides lubrication and heat removal for compressor bearings and internal parts. In addition,
the system provides lubricant under pressure to hydraulically operate the unloading piston for positioning the inlet
guide vanes for capacity control. DWDC, dual compressor chillers, have completely independent lubrication systems
for each compressor.

Only the recommended lubricant, as shown in Table 13, can be used for proper operation of the hydraulic system
and bearing lubrication system. Each unit is factory-charged with the correct amount of the recommended lubricant.
Under normal operation, no additional lubricant is needed. Lubricant must be visible in the sump sight glass at all
times.

The compressor sizes, CE079, through CE126, utilize a separate lubricant pump located in the sump. The sump
includes the pump, motor, heater and lubricant/vapor separator system. The lubricant is pumped through the external
oil cooler and then to the oil filter located inside the compressor housing. DWSC/DWDC/DWCC 063-126 units,
single or dual compressor, all utilize a water-cooled oil cooler for each compressor.

Drain From Piston

#3 Outlet

SB

SA

#1 Intlet

LEGEND

Oil Under Pressure

To Oil
Pump Sump

Section “SB”

Energized

Section “SA”

De-energized

From Oil
Pump Discharge

OPENING

Oil Sump Pressure

Drain From Piston

#3 Outlet

SB

SA

#1 Intlet

To Oil
Pump Sump

Section “SB”

De-energized

Section “SA”

Energized

From Oil
Pump Discharge

CLOSING

Piston Drain

D–EIMWC00808-16HU - 44/64

The oil coolers maintain the proper oil temperature under normal operating conditions. The coolant flow control
valve maintains 95°F to 105°F (35°C to 41°C). Lubrication protection for coast down in the event of a power failure
is accomplished by a spring-loaded piston in models CE050 through 100. When the oil pump is started, the piston is
forced back against the spring by the oil pressure, compressing the spring, and filling the piston cavity with oil. When
the pump stops, the spring pressure on the piston forces the oil back out to the bearings.

In model CE126 the compressor coast down lubrication is supplied from a gravity feed oil reservoir.
A typical flow diagram is shown in Figure 23.

Table 13, Approved Polyolester Oils For R-134a Units

Compressor Models

CE050 - 126

Lubricant Designation

Mobil Artic EAL 46;
ICI Emkarate RL32H

(2)

Daikin Part Number
55 Gal. Drum
5 Gal. Drum
1 Gal. Can

735030432, Rev 47
735030433, Rev 47
735030435, Rev 47

Compressor Oil Label

070200106, Rev OB

NOTES:

1. Approved oil from two suppliers can be mixed, although they have slightly different viscosity.

2. Lubricant from either supplier can be furnished when ordering by Daikin part number.

Figure 23, Typical Oil Flow Diagram

NOTES:

1. Diagram does not apply to CE 050 compressors, which have self-contained lubrication systems.

2. Connections are not necessarily in correct relative location.

3. R = relief valve, P = pressure sensor, T = temperature sensor, S = solenoid valve

Hot Gas Bypass

All units can be equipped with an optional hot gas bypass system that feeds discharge gas directly into the evaporator
when the system load falls below 10% compressor capacity.

D–EIMWC00808-16HU - 45/64

Light load conditions are signaled by measurement of the percentage of RLA amps by the MicroTech II controller.
When the RLA drops to the setpoint, the hot gas bypass solenoid valve is energized, making hot gas bypass available
for metering by the hot gas regulating valve. This hot gas provides a stable refrigerant flow and keeps the chiller
from short cycling under light load conditions. It also reduces surge potential on heat recovery units.

The factory setpoint for bringing on hot gas bypass is 40% of RLA.

Condenser Water Temperature

When the ambient wet bulb temperature is lower than design, the entering condenser water temperature can be
allowed to fall, improving chiller performance.

Daikin chillers will start with entering condenser water temperature as low as 55F (42.8C) providing the chilled
water temperature is below the condenser water temperature.

The minimum operating entering condenser water temperature is a function of the leaving chilled water temperature
and load. Even with tower fan control, some form of water flow control such as tower bypass must be used.

D–EIMWC00808-16HU - 46/64

Maintenance

Pressure/Temperature Chart

HFC-R134a Temperature Pressure Chart

°F

PSIG

°F

PSIG

°F

PSIG

°F

PSIG

6

9.7

46

41.1

86

97.0

126

187.3

8

10.8

48

43.2

88

100.6

128

192.9

10

12.0

50

45.4

90

104.3

130

198.7

12

13.2

52

47.7

92

108.1

132

204.5

14

14.4

54

50.0

94

112.0

134

210.5

16

15.7

56

52.4

96

115.9

136

216.6

18

17.1

58

54.9

98

120.0

138

222.8

20

18.4

60

57.4

100

124.1

140

229.2

22

19.9

62

60.0

102

128.4

142

235.6

24

21.3

64

62.7

104

132.7

144

242.2

26

22.9

66

65.4

106

137.2

146

249.0

28

24.5

68

68.2

108

141.7

148

255.8

30

26.1

70

71.1

110

146.3

150

262.8

32

27.8

72

74.0

112

151.1

152

270.0

34

29.5

74

77.1

114

155.9

154

277.3

36

31.3

76

80.2

116

160.9

156

284.7

38

33.1

78

83.4

118

166.0

158

292.2

40

35.0

80

86.7

120

171.1

160

299.9

42

37.0

82

90.0

122

176.4

162

307.8

44

39.0

84

93.5

124

181.8

164

315.8

D–EIMWC00808-16HU - 47/64

HFC-R513A Temperature Pressure Chart

°F

PSIG

°F

PSIG

°F

PSIG

°F

PSIG

6

13.0

46

46.3

86

104

126

195.2

8

14.2

48

48.6

88

108

128

200.8

10

15.5

50

50.9

90

111

130

206.6

12

16.8

52

53.2

92

115

132

212.4

14

18.1

54

55.6

94

119

134

218.4

16

19.5

56

58.1

96

123

136

224.5

18

21.0

58

60.7

98

127

138

230.7

20

22.4

60

63.3

100

132

140

237.1

22

24.0

62

66.0

102

136

142

243.6

24

25.5

64

68.7

104

140

144

250.1

26

27.2

66

71.5

106

145

146

256.9

28

28.8

68

74.4

108

149

148

263.7

30

30.6

70

77.4

110

154

150

270.7

32

32.3

72

80.4

112

159

152

277.8

34

34.2

74

83.6

114

164

154

285.0

36

36.1

76

86.8

116

169

156

292.4

38

38.0

78

90.0

118

174

158

300.0

40

40.0

80

93.4

120

179

160

307.6

42

42.0

82

96.8

122

184

162

315.4

44

44.2

84

100.3

124

190

164

323.4

Routine Maintenance

Lubrication

CAUTION

Improper servicing of the lubrication system, including the addition of excessive or incorrect oil,

substitute quality oil filter, or any mishandling can damage the equipment. Only authorized

and trained service personnel should attempt this service. For qualified assistance, contact

your local Daikin service location.

After the system is once placed into operation, no other additional oil is required except in the event that repair work
becomes necessary to the oil pump, or unless a large amount of oil is lost from the system due to a leak.

If oil must be added with the system under pressure, use a hand pump with its discharge line connected to the backseat
port of the valve in the lubricant drain from the compressor to the sump. See Figure 20 on page 42. The POE oils
used with R-134a/R513A are hygoscopic and care must be exercised to avoid exposure to moisture (air).

The condition of compressor oil can be an indication of the general condition of the refrigerant circuit and compressor
wear. An annual oil check by a qualified laboratory is essential for maintaining a high level of maintenance. It is
useful to have an oil analysis at initial startup to provide a benchmark from which to compare future tests. The local
Daikin service office can recommend suitable facilities for performing these tests.

Table 14 gives the upper limits for metals and moisture in the polyolester lubricants required by Daikin chillers.

D–EIMWC00808-16HU - 48/64

Table 14, Metal and Moisture Limits

Element

Upper Limit (PPM)

Action

Aluminum

50

1

Copper

100

1

Iron

100

1

Moisture

150

2 & 3

Silica

50

1

Total Acid Number (TAN)

0.19

3

Key to Action

1) Re-sample after 500 hours of unit operation.
a) If content increases less than 10%, change oil and oil filter and re-sample at normal interval (usually

annual).

b) If content increases between 11% and 24%, change oil and oil filter and re-sample after an additional 500

hours of operation.

c) If content increases more than 25%, inspect compressor for cause.

2) Re-sample after 500 hours of unit operation.

a) If content increases less than 10%, change filter-drier and re-sample at normal interval (usually annual).
b) If content increases between 11% and 24%, change filter-drier and re-sample after an additional 500

hours of operation.

c) If content increases more than 25%, monitor for a water leak.

3) If TAN is less than 0.10, system is safe as far as acid is concerned.
a) For TAN between 0.10 and 0.19, re-sample after 1000 hours of operation.
b) For TAN above 0.19, change oil, oil filter, and filter-drier and resample at normal interval

Changing Oil Filters

Daikin chillers are at positive pressure at all times and do not leak contaminated moist air into the refrigerant circuit,
thereby eliminating the need for annual oil changes. An annual laboratory oil check is recommended to check overall
compressor condition.

CE 079 and Larger Compressors - The oil filter in these compressors can be changed by simply isolating the filter
cavities. Close the oil discharge line service valve at the oil pump (at the filter on CE126). Remove the filter cover;
some foaming can occur but the check valve should limit leakage from other compressor cavities. Remove the filter,
replace with new element, and replace filter cover using a new gasket. Reopen the valve in the pump discharge line
and purge air from the oil filter cavity.

When machine is operated again, the oil level must be checked to determine if oil needs to be added to maintain the
proper operating level.

Refrigerant Cycle

Maintenance of the refrigerant cycle includes maintaining a log of the operating conditions, and checking that the
unit has the proper oil and refrigerant charge.

At every inspection, the oil, suction, and discharge pressures should be noted and recorded, as well as condenser and
chiller water temperatures.

The suction line temperature at the compressor should be taken at least once a month. Subtracting the saturated
temperature equivalent of the suction pressure from this will give the suction superheat. Extreme changes in
subcooling and/or superheat over a period of time will indicate losses of refrigerant or possible deterioration or
malfunction of the expansion valves. Proper superheat setting is 0 to 1 degree F (0.5 degree C) at full load. Such a
small temperature difference can be difficult to measure accurately. Another method is to measure the compressor
discharge superheat, the difference between the actual discharge temperature and the saturated discharge
temperature. The discharge superheat should be between 14 and 16 degrees F (8 to 9 degrees C) at full load. The
liquid injection must be deactivated (by closing the valve in the feed line) when taking the discharge temperature.

D–EIMWC00808-16HU - 49/64

The superheat will increase linearly to 55 degrees F (30 degrees C) at 10% load. The MicroTech II interface panel
can display all superheat and subcooling temperatures.

D–EIMWC00808-16HU - 50/64

Figure 25. Typical Refrigerant Flow Diagram

Connections are not necessarily in correct relative location.

D–EIMWC00808-16HU - 51/64

Electrical System

Maintenance of the electrical system involves the general requirement of keeping contacts clean and connections
tight and checking on specific items as follows:

1. The compressor current draw should be checked and compared to nameplate RLA value. Normally, the

actual current will be lower, since the nameplate rating represents full load operation. Also check all pump

and fan motor amperages, and compare with nameplate ratings.

2. Inspection must verify that the oil heaters are operative. The heaters are insert-cartridge type and can be

checked by ammeter reading. They should be energized whenever power is available to the control circuit,
when the oil temperature sensor calls for heat, and when the compressor is inoperative. When the
compressor runs, the heaters are de-energized. The Digital Output screen and second View screen on the

operator interface panel both indicate when the heaters are energized.

3. At least once a quarter, all equipment protection controls except compressor overloads should be made to

operate and their operating points checked. A control can shift its operating point as it ages, and this must be
detected so the controls can be adjusted or replaced. Pump interlocks and flow switches should be checked

to be sure they interrupt the control circuit when tripped.

4. The contactors in the motor starter should be inspected and cleaned quarterly. Tighten all terminal

connections.

5. The compressor motor resistance to ground should be checked and logged semi-annually. This log will track

insulation deterioration. A reading of 50 megohms or less indicates a possible insulation defect or moisture

and must be further checked.

CAUTION

Never Megger a motor while in a vacuum. Severe motor damage can result.

6. The centrifugal compressor must rotate in the direction indicated by the arrow on the rear motor cover plate,

near the rotation sight glass. If the operator has any reason to suspect that the power system connections
have been altered, (phases reversed) the compressor must be jogged to check rotation. For assistance, call

the local Daikin service location.

Cleaning and Preserving

A common cause of service calls and equipment malfunction is dirt. This can be prevented with normal maintenance.
The system components most subject to dirt are:

1. Permanent or cleanable filters in the air handling equipment must be cleaned in accordance with the

manufacturer’s instructions; throwaway filters should be replaced. The frequency of this service will vary
with each installation.

2. Remove and clean strainers in chilled water system, oil cooler line and condenser water system at every
inspection.

Seasonal Servicing

Prior to shutdown periods and before starting up again, the following service procedures must be completed.

Annual Shutdown

Where the chiller can be subject to freezing temperatures, the condenser and chiller must be drained of all water.
Dry air blown through the condenser will aid in forcing all water out. Removal of condenser heads is also
recommended. The condenser and evaporator are not self-draining and tubes must be blown out. Water permitted
to remain in the piping and vessels can rupture these parts if subjected to freezing temperature.

Forced circulation of antifreeze through the water circuits is one method of avoiding freeze up.

1. Take measures to prevent the shutoff valve in the water supply line from being accidentally turned on.

2. If a cooling tower is used, and if the water pump will be exposed to freezing temperatures, be sure to remove
the pump drain plug and leave it out so any water that can accumulate will drain away.

D–EIMWC00808-16HU - 52/64

3. Open the compressor disconnect switch, and remove the fuses. If the transformer is used for control

voltage, the disconnect must remain on to provide power to the oil heater. Set the manual UNIT

ON/OFF switch in the Unit Control Panel to the OFF position.

4. Check for corrosion and clean and paint rusted surfaces.

5. Clean and flush water tower for all units operating on a water tower. Make sure tower blowdown or bleed-

off is operating. Set up and use a good maintenance program to prevent “liming up” of both tower and

condenser. It should be recognized that atmospheric air contains many contaminants that increase the need
for proper water treatment. The use of untreated water can result in corrosion, erosion, sliming, scaling or
algae formation. It is recommended that the service of a reliable water treatment company be used. Daikin
assumes no responsibility for the results of untreated or improperly treated water.

6. Remove condenser heads at least once a year to inspect the condenser tubes and clean if required.

Annual Startup

A dangerous condition can exist if power is applied to a faulty compressor motor starter that has been burned out.
This condition can exist without the knowledge of the person starting the equipment.

This is a good time to check all the motor winding resistance to ground. Semi-annual checking and recording of this
resistance will provide a record of any deterioration of the winding insulation. All new units have well over 100
megohms resistance between any motor terminal and ground.

Whenever great discrepancies in readings occur, or uniform readings of less than 50 megohms are obtained, the
motor cover must be removed for inspection of the winding prior to starting the unit. Uniform readings of less than
5 megohms indicate motor failure is imminent and the motor should be replaced or repaired. Repair before failure
occurs can save a great deal of time and labor spent in the cleanup of a system after a motor burnout.

1. The control circuit must be energized at all times, except during service. If the control circuit has been off

and oil is cool, energize oil heaters and allow 24 hours for heater to remove refrigerant from the oil before
starting.

2. Check and tighten all electrical connections.

3. Replace the drain plug in the cooling tower pump if it was removed at shutdown time the previous season.

4. Install fuses in main disconnect switch (if removed).

5. Reconnect water lines and turn on supply water. Flush condenser and check for leaks.

6. Refer to Manual OM CentrifMicro II before energizing the compressor circuit.

Repair of System

Pressure Relief Valve Replacement

Current condenser designs use two relief valves separated by a three-way shutoff valve (one set). This three-way
valve allows either relief valve to be shut off, but at no time can both be shut off. In the event one of the relief valves
are leaking in the two valve set, these procedures must be followed:

• If the valve closest to the valve stem is leaking, back seat the three-way valve all the way, closing the port to

the leaking pressure relief valve. Remove and replace the faulty relief valve. The three-way shutoff valve
must remain either fully back seated or fully forward to normal operation. If the relief valve farthest from

the valve stem is leaking, front seat the three-way valve and replace the relief valve as stated above.

• The refrigerant must be pumped down into the condenser before the evaporator relief valve can be removed.

Pumping Down

If it becomes necessary to pump the system down, extreme care must be used to avoid damage to the evaporator
from freezing. Always make sure that full water flow is maintained through the chiller and condenser while pumping
down. To pump the system down, close all liquid line valves. With all liquid line valves closed and water flowing,
start the compressor. Set the MicroTech II control to the manual load. The vanes must be open while pumping down
to avoid a surge or other damaging condition. Pump the unit down until the MicroTech II controller cuts out at

D–EIMWC00808-16HU - 53/64

approximately 20 psig. It is possible that the unit might experience a mild surge condition prior to cutout. If this
should occur, immediately shut off the compressor. Use a portable condensing unit to complete the pump down,
condense the refrigerant, and pump it into the condenser or pumpout vessel using approved procedures.

A pressure regulating valve must always be used on the drum being used to build the system pressure. Also, do not
exceed the test pressure given above. When the test pressure is reached disconnect the gas cylinder.

Pressure Testing

No pressure testing is necessary unless some damage was incurred during shipment. Damage can be determined
upon a visual inspection of the exterior piping, checking that no breakage occurred or fittings loosened. Service
gauges should show a positive pressure. If no pressure is evident on the gauges, a leak may have occurred,
discharging the entire refrigerant charge. In this case, the unit must be leak tested to determine the location of the
leak.

Leak Testing

In the case of loss of the entire refrigerant charge, the unit must be checked for leaks prior to charging the complete
system. This can be done by charging enough refrigerant into the system to build the pressure up to approximately
10 psig (69 kPa) and adding sufficient dry nitrogen to bring the pressure up to a maximum of 125 psig (860 kPa).
Leak test with an electronic leak detector. Halide leak detectors do not function with R-134a. Water flow through
the vessels must be maintained anytime refrigerant is added or removed from the system.

WARNING

Do not use oxygen or a mixture of R-22 and air to build up pressure

as an explosion can occur causing serious personal injury.

If any leaks are found in welded or brazed joints, or it is necessary to replace a gasket, relieve the test pressure in the
system before proceeding. Brazing is required for copper joints.

After making any necessary repair, the system must be evacuated as described in the following section.

Evacuation

After it has been determined that there are no refrigerant leaks, the system must be evacuated using a vacuum pump
with a capacity that will reduce the vacuum to at least 1000 microns of mercury.

A mercury manometer, or an electronic or other type of micron gauge, must be connected at the farthest point from
the vacuum pump. For readings below 1000 microns, an electronic or other micron gauge must be used.

The triple evacuation method is recommended and is particularly helpful if the vacuum pump is unable to obtain the
desired 1 millimeter of vacuum. The system is first evacuated to approximately 29 inches of mercury. Dry nitrogen
is then added to the system to bring the pressure up to zero pounds.

Then the system is once again evacuated to approximately 29 inches of mercury. This is repeated three times. The
first pulldown will remove about 90% of the noncondensables, the second about 90% of that remaining from the first
pulldown and, after the third, only 1/10-1% noncondensables will remain.

Charging the System

DWSC and DWDC water chillers are leak tested at the factory and shipped with the correct charge of refrigerant as
indicated on the unit nameplate. In the event the refrigerant charge was lost due to shipping damage, the system
should be charged as follows after first repairing the leaks and evacuating the system.

1. Connect the refrigerant drum to the gauge port on the liquid line shutoff valve and purge the charging line

between the refrigerant cylinder and the valve. Then open the valve to the mid-position.

2. Turn on both the cooling tower water pump and chilled water pump and allow water to circulate through the

condenser and the chiller. (It will be necessary to manually close the condenser pump starter.)

3. If the system is under a vacuum, stand the refrigerant drum with the connection up, and open the drum and

break the vacuum with refrigerant gas to a saturated pressure above freezing.

4. With a system gas pressure higher than the equivalent of a freezing temperature, invert the charging cylinder

and elevate the drum above the condenser. With the drum in this position, valves open, water pumps

D–EIMWC00808-16HU - 54/64

operating, liquid refrigerant will flow into the condenser. Approximately 75% of the total requirement
estimated for the unit can be charged in this manner.

5. After 75% of the required charge has entered the condenser, reconnect the refrigerant drum and charging line

to the service valve on the bottom of the evaporator. Again purge the connecting line, stand the drum with
the connection up, and place the service valve in the open position.

IMPORTANT: At this point, the charging procedure should be interrupted and prestart checks made
before attempting to complete refrigerant charge. The compressor must not be started at this time.

(Preliminary check must first be completed.)

NOTE: It is of utmost importance that all local, national, and international regulations concerning the

handling and emission of refrigerants are observed.

Compressor Maintenance

In order to work safely on centrifugal compressors, technicians need to be aware that there is a potential risk of the
low speed seal trapping pressure in the motor-housing. Refrigerant in the motor housing must be recovered by the
evaporator service port through the motor cooling drain line (shut off valve on drain line must remain open). As an
alternative the motor housing can be emptied through its pressure port on the inlet cooling-line. Never work on the
motor housing if not checked that its pressure is zero bar.

WARNING

Failure to remove all refrigerant pressure from the whole compressor can result in the pressure

ejection of components during disassembly operation and cause personal injury.

Any work on compressor has to be carried out only by trained technicians,

please refer to DAIKIN representative.

Once recovered the refrigerant from the compressor, service gauges must to be used to check if residual pressure is
still present inside the three section of compressor: Suction/Discharge – Gear Box – Motor Housing. Never work on
compressor if not checked that its pressure is zero bar in all three sections.

D–EIMWC00808-16HU - 55/64

Flanged joints disassembly

When accessing any flanged connection never loosen and remove individual bolts.
Always loosen each bolt slightly and in turn, sequentially, until the flange is clear of the connection.
This will retain most of the bolt safety integrity as the flange is removed.

If pressure should be present, STOP, retighten the bolts and determine why pressure is present.

Motor Housing Pressure Port

D–EIMWC00808-16HU - 56/64

Oil Analysis

Interpreting Oil Analysis Data

Oil wear metals analysis has long been recognized as a useful tool for indicating the internal condition of rotating
machinery and continues to be a preferred method for Daikin centrifugal chillers. Daikin Service or a number of
laboratories specializing in oil testing can do the test. To accurately estimate the internal condition it is essential to
properly interpret the oil wear test results.

Numerous test results from various testing laboratories have recommended action that has prompted unnecessary
concern by customers. Polyolester oils are excellent solvents and can readily dissolve trace elements and
contaminants. Most of these elements and contaminates eventually end up in the oil. Also, the polyolester oils used
in R-134a chillers are more hygroscopic than mineral oils and can contain much more water in solution. For this
reason, it is imperative that extra care be used when handling polyolester oils to minimize their exposure to ambient
air. Extra care must also be used when sampling to ensure that sample containers are clean, moisture-free leak proof
and non-permeable.

Daikin has done extensive testing in conjunction with refrigerant and lubricating oil manufacturers and has
established guidelines to determine action levels and the type of action required. Table 1 indicates these parameters.

In general Daikin does not recommend changing lubricating oils and filters on a periodic basis. The need to change
lubricating oil and filters should be based on a careful consideration of oil analysis, vibration analysis and knowledge
of the operating history of the equipment. A single oil sample is not sufficient to estimate the condition of the chiller.
Oil analysis is only useful if employed to establish wear trends over time. Changing lubricating oil and filter prior
to when its needed will reduce the effectiveness of oil analysis as a tool in determining machinery condition.

The following metallic elements or contaminates and their possible sources will typically be identified in an oil wear
analysis.

Aluminum

Typical sources of aluminum are bearings, impellers, seals or casting material. An increase in
aluminum content in the lubricating oil may be an indication of bearing, impeller or other wear.
A corresponding increase in other wear metals may also accompany an increase in aluminum

content.

Copper

The source of copper can be the evaporator or condenser tubes, copper tubing used in the
lubrication and motor cooling systems or residual copper from the manufacturing process. The
presence of copper may be accompanied by a high TAN (total acid number) and high moisture
content. High copper contents may also result from residual mineral oil in machines which have
been converted to R-134a. Some mineral oils contained wear inhibitors which react with copper

and result in high copper content in lubricating oil.

Iron

Iron in the lubricating oil can originate from compressor castings, oil pump components, shells,
tube sheets, tube supports, shaft material and rolling element bearings. High iron content may
also result from residual mineral oil in machines which have been converted to R-134a. Some
mineral oils contain wear inhibitors which react with iron and can result in a high iron content in

the lubricating oil.

Tin

The source of tin may be from bearings.

Zinc

There is no zinc used in the bearings on Daikin chillers. The source, if any may be from
additives in some mineral oils.

D–EIMWC00808-16HU - 57/64

Lead

The source of lead in Daikin centrifugal chillers is the thread sealant compounds used during
chiller assembly. The presence of lead in the lubricating oil in Daikin chillers does not indicate

bearing wear.

Silicon

Silicon can originate from residual particles of silicon left from the manufacturing process, filter
drier material, dirt or anti-foam additives from residual mineral oil which may be present in
machines that have been converted to R-134a.

Moisture

Moisture in the form of dissolved water can be present in lubricating oil to varying degrees. Some
polyolester oils may contain up to 50 parts per million (ppm) of water from new unopened
containers. Other sources of water may be the refrigerant (new refrigerant may contain up to 10
ppm water), leaking evaporator condenser tubes or oil coolers, or moisture introduced by the
addition of either contaminated oil or refrigerant or improperly handled oil.

Liquid R-134a has the ability to retain up to 1400 ppm of water in solution at 100 degrees F. With
225 ppm of water dissolved in liquid R-134a, free water would not be released until the liquid
temperature reached -22 degrees F. Liquid R-134a can hold approximately 470 ppm at 15 degrees
F (an evaporator temperature which could be encountered in ice applications). Since free water is
what causes acid production, moisture levels should not be of a concern until they approach the
free water release point.

A better indicator of a condition which should be of concern is the TAN (Total Acid Number). A
TAN below 0.09 requires no immediate action. TANs above 0.09 require certain actions. In the
absence of a high TAN reading and a regular loss of refrigerant oil (which may indicate a heat
transfer surface leak) a high moisture content in an oil wear analysis is probably due to handling
or contamination of the oil sample. It should be noted that air (and moisture) can penetrate plastic
containers. Metal or glass containers with gasket in the top will slow moisture entry.

In conclusion, a single element of an oil analysis should not be used as the basis to estimate the
overall internal condition of a Daikin chiller. The characteristics of the lubricants and refrigerants,
and knowledge of the interaction of wear materials in the chiller must be considered when
interpreting a wear metal analysis. Periodic oil analysis performed by a reputable laboratory and
used in conjunction with compressor vibration analysis and operating log review can be helpful
tools in estimating the internal condition of a Daikin chiller.

Normal Sample Intervals

Daikin recommends that an oil analysis be performed annually. Professional judgment must be exercised under
unusual circumstances, for example, it might be desirable to sample the lubricating oil shortly after a unit has been
placed back into operation after it has been opened for service, as recommended from previous sample results or
after a failure. The presence of residual materials from a failure should be taken into consideration in subsequent
analysis. While the unit is in operation, the sample should be taken from a stream of refrigerant oil, not in a low spot
/ quiet area.

D–EIMWC00808-16HU - 58/64

Table 15, Upper Limit For Wear Metals And Moisture In Polyolester Oils In Daikin

Centrifugal Chillers

Elements

Upper Limit (ppm)

Action

Aluminum

50

1

Copper

100

1

Iron

100

1

Moisture

150

2 &3

Silica

50

1

Total Acid Number (TAN)

.19

3

Key To Action

1. Re-sample after 500 hours of unit operation. If content increases less than 10%, change oil and filter and re-

sample at normal interval. If content increases 25% or more, inspect compressor.

2. Re-sample after 500 hours of unit operation. If content increases less than 10%, change filter drier and re-

sample at normal interval. If content increases 25% or more, monitor for water leak. Since POE lubricants
are hygroscopic, many times the high moisture level is due to inadequate handling and packaging. The TAN

reading MUST BE USED in conjunction with moisture readings

3. For TAN between .10 and .19, re-sample after 1000 hours of unit operation. If TAN increases above .19,

change oil, oil filter and filter drier and re-sample at normal interval.

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Maintenance Schedule

Maintenance Check List Item

Daily

Weekly

Monthly

Quarterly

Annually

5-Yr

As Req

’d

I. Unit

· Operational Log

O

· Analyze Operational Log

O

· Refrigerant Leak Test Chiller

O

· Test Relief Valves or Replace

X

II. Compressor

· Vibration Test Compressor

X

A. Motor

· Meg. Windings (Note 1)

X

· Ampere Balance (within 10% at RLA)

O

· Terminal Check (Infrared temperature measurement)

X

· Motor Cooling Filter Drier Pressure Drop

X

B. Lubrication System

· Clean Oil Cooler Strainer (water)

X

· Oil Cooler Solenoid Operation

O

· Oil Appearance (clear color, quantity)

O

- Oil Filter Pressure Drop

O

· Oil Analysis (Note 5)

X

· Oil change if indicated by oil analysis

X

III. Controls

A. Operating Controls

· Calibrate Temperature Transducers

X

· Calibrate Pressure Transducers

X

· Check Vane Control Setting and Operation

X

· Verify Motor Load Limit Control

X

· Verify Load Balance Operation

X

· Check Oil Pump Contactor

X

B. Protective Controls

· Test Operation of:

Alarm Relay

X

Pump Interlocks

X

Guardistor and Surgeguard Operation

X

High and Low Pressure Cutouts

X

Oil Pump Pressure Differential Cutout

X

Oil Pump Time Delay

X

Continued on next page.

D–EIMWC00808-16HU - 60/64

Maintenance Schedule, Cont.

Maintenance Check List Item

Daily

Weekly

Monthly

Quarterly

Annually

5-Yr

As Req

’d

IV. Condenser

A. Evaluation of Temp Approach (NOTE 2)

O

B. Test Water Quality

V

C. Clean Condenser Tubes (NOTE 2)

X X

D. Eddy current Test - Tube Wall Thickness

V

E. Seasonal Protection

X

V. Evaporator

A. Evaluation of Temp Approach (NOTE 2)

O

B. Test Water Quality

V

C. Clean Evaporator Tubes (NOTE 3)

X

D. Eddy current Test - Tube Wall thickness

V X

E. Seasonal Protection

X

VI. Expansion Valves

A.Operational Evaluation (Superheat Control)

X

VII. Starter(s)

A. Examine Contactors (hardware and operation)

X

B. Verify Overload Setting and Trip

X

C. Test Electrical Connections (Infrared temp measurement)

X

VIII. Optional Controls

A. Hot Gas Bypass (verify operation)

X

KEY:

O = Performed by in-house personnel.

X = Performed by Daikin authorized service personnel. (NOTE 4)

V = Normally performed by third parties.

NOTES:

1. Some compressors use power factory correction capacitors and all have a surge capacitor (excepting units with solid state

starters). The surge capacitor can be installed out of sight in the compressor motor terminal box. In all cases, capacitors must be
disconnected from the circuit to obtain a useful Megger reading. Failure to do so will produce a low reading. In handling

electrical components, only fully qualified technicians must attempt service.

2. Approach temperature (the difference between the leaving water temperature and the saturated refrigerant temperature) of either

the condenser or evaporator is a good indication of tube fouling, particularly in the condenser, where constant flow usually
prevails. Daikin's high efficiency heat exchangers have very low design approach temperatures, in the order of one to one and

one half degrees F.

The chiller unit controller can display the water and the saturated refrigerant temperatures. Simple subtraction will give the
approach. It is recommended that benchmark readings (including condenser pressure drop to confirm future flow rates) be taken

during startup and then periodically afterward. An approach increase of two-degrees or more would indicate that excessive tube
fouling could be present. Higher than normal discharge pressure and motor current are also good indicators

3. Evaporators in closed fluid circuits with treated water or anti-freeze are not normally subject to fouling, hover it is prudent to

check the approach periodically.

4. Performed when contracted for, not part of standard initial warranty service.

5. Oil filter change and compressor teardown and inspection should be done based on the results of the annual oil test performed

by a company specializing in this type of test. Consult Daikin Factory Service for recommendations.

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Service Programs

It is important that an air conditioning system receive adequate maintenance if the full equipment life and full system
benefits are to be realized.

Maintenance should be an ongoing program from the time the system is initially started. A full inspection should be
made after 3 to 4 weeks of normal operation on a new installation, and on a regular basis thereafter.

Daikin offers a variety of maintenance services through the local Daikin service office, its worldwide service
organization, and can tailor these services to suit the needs of the building owner. Most popular among these services
is the Daikin Comprehensive Maintenance Contract.

For further information concerning the many services available, contact your local Daikin service office.

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Operator Schools

Training courses for Centrifugal Maintenance and Operation are held through the year at the Training Center in
Staunton, Virginia. The school duration is three and one-half days and includes instruction on basic refrigeration,
MicroTech controllers, enhancing chiller efficiency and reliability, MicroTech troubleshooting, system components,
and other related subjects. Further information can be found on www.daikineurope.com or call Daikin at 540-248­0711 and ask for the Training Department.

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Warranty Statement

Limited Warranty

Consult your local Daikin Representative for warranty details. Refer to Form 933-43285Y. To find your

local Daikin Representative, go to www.daikineurope.com.

  The following are trademarks or registered trademarks of their respective companies: Loctite from
Henkel Company; 3M, Scotchfil and Scotchkote from the 3M Company; Victaulic from Victaulic Company;
Megger from Megger Group Limited; Distinction Series, MicroTech II and Protocol Selectability from
Daikin.

Obligatory routine checks and starting up apparatuses under

pressure

The units are included in category IV of the classification according to European Directive PED 2014/68/EU

For chillers belonging to this category, some local regulations require a periodic inspection by an authorized agency.

Please check with your local requirements.

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Important information regarding the refrigerant used

This product contains fluorinated greenhouse gases. Do not vent gases into the atmosphere.

Refrigerant type: R134a/R513A

GWP(1) value: 1430/631

(1)GWP = Global Warming Potential

The refrigerant quantity is indicated on the unit name plate.
Periodical inspections for refrigerant leaks may be required depending on European or local legislation. Please contact your local

dealer for more information.

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Factory and Field charged units instructions

(Important information regarding the refrigerant used)

The refrigerant system will be charged with fluorinated greenhouse gases.
Do not vent gases into the atmosphere.

1 Fill in with indelible ink the refrigerant charge label supplied with the product as following instructions:

- the refrigerant charge for each circuit (1; 2; 3)

- the total refrigerant charge (1 + 2 + 3)

- calculate the greenhouse gas emission with the following formula:

GWP value of the refrigerant x Total refrigerant charge (in kg) / 1000

a Contains fluorinated greenhouse gases
b Circuit number
c Factory charge
d Field charge
e Refrigerant charge for each circuit (according to the number of circuits)
f Total refrigerant charge
g Total refrigerant charge (Factory + Field)
h Greenhouse gas emission of the total refrigerant charge expressed
as tonnes of CO2 equivalent
m Refrigerant type

n GWP = Global Warming Potential
p Unit serial number

2 The filled out label must be adhered inside the electrical panel.
Periodical inspections for refrigerant leaks may be required depending on European or local legislation.
Please contact your local dealer for more information.

NOTICE

In Europe, the greenhouse gas emission of the total refrigerant charge in the system
(expressed as tonnes CO2 equivalent) is used to determine the maintenance intervals.
Follow the applicable legislation.

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Formula to calculate the greenhouse gas emission:
GWP value of the refrigerant x Total refrigerant charge (in kg) / 1000

Use the GWP value mentioned on the greenhouse gases label. This GWP value is
based on the 4th IPCC Assessment Report. The GWP value mentioned in the manual might be outdated
(i.e. based on the 3rd IPCC Assessment Report)

Disposal

The unit is made of metal, plastic and electronic parts. All of these components must be disposed of in accordance with local

disposal laws and if in scope with the national laws implementing the Directive 2012/19/EU (RAEE).
Lead batteries must be collected and sent to specific waste collection centres.

Avoid the escape of refrigerant gases into the environment by using suitable pressure vessels and tools for transferring the fluids
under pressure. This operation must be carried out by qualified personnel in refrigeration systems and in compliance with the

laws in force in the country of installation.

The present publication is drawn up by of information only and does not constitute an offer binding upon Daikin Applied Europe S.p.A..
Daikin Applied Europe S.p.A. has compiled the content of this publication to the best of its knowledge. No express or implied warranty
is given for the completeness, accuracy, reliability or fitness for particular purpose of its content, and the products and services
presented therein. Specification are subject to change without prior notice. Refer to the data communicated at the time of the order.
Daikin Applied Europe S.p.A. explicitly rejects any liability for any direct or indirect damage, in the broadest sense, arising from or
related to the use and/or interpretation of this publication. All content is copyrighted by Daikin Applied Europe S.p.A..

DAIKIN APPLIED EUROPE S.p.A.

Via Piani di Santa Maria, 72 - 00072 Ariccia (Roma) - Italia
Tel: [phone] - Fax: [phone]
http://www.daikinapplied.eu