McQuay WSC, WDC, TSC, WCC, HSC Operating Manual

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Operating Manual

OM CentrifMicro II-5

MicroTech ΙΙΙΙΙΙΙΙ Controller

With Starter Information

For Centrifugal Chillers and Templifiers

Models WSC, WDC, WCC, HSC, TSC

Software Version: WCFU3UU04C/D/E

OITS Version: 2.05.03

Group: Chiller

Part Number: 331374901

Effective: March 2011

Supersedes: November 2010

WSC, WDC

Table of Contents

Introduction ............................................... 3

Features of the Control Panel................... 4

General Description................................... 5

Component Description ............................6

Operator Interface Touch Screen ........................... 6

Unit/Compressor Controller Description ............... 6

Software................................................................. 7

Unit Controller....................................................... 7

Compressor Controller .......................................... 8

Guardister Board ................................................ 9

Signal Converter Board ......................................... 9

Transducer Converter Board.................................. 9

PLAN Isolator ....................................................... 9

Field Wiring Diagram..........................................10

Dual/Multi-Chiller Operation ................12

Multiple Chiller Setup ......................................... 12

WCC Settings ......................................................15

Ice Mode Operation................................. 16

Operator Interface Touch Screen........... 16

Navigation ........................................................... 16

Screen Descriptions ............................................. 18

VIEW Screens ..................................................... 18

SET Screens.........................................................23

SERVICE Screen ................................................. 37

HISTORY Screens ...............................................38

Download from the USB .....................................39

ACTIVE ALARM Screen.................................... 40

Unit Controller......................................... 43

Navigating ........................................................... 43

Screen Descriptions ............................................. 46

SET Screens.........................................................49

Unit Controller Setpoints..................................... 51

Compressor Controller ........................... 61

Navigating ........................................................... 61

Compressor Controller Setpoints......................... 62

Optional Starter Screens......................... 67

Low Voltage Starters, 200 – 600 Volts.... 68

General ................................................................ 68

LED Display........................................................ 69

Faults and Alarms ................................................ 74

Troubleshooting................................................... 77

Preventive Maintenance ...................................... 82

Medium/High Voltage Starters, 2300V

– 7.2KV..................................................... 83

View Parameters .................................................. 84

Set Parameters ..................................................... 84

Quick Start........................................................... 86

Troubleshooting................................................... 88

Fault/Log Codes .................................................. 90

LED Diagnostics ................................................. 93

Preventive Maintenance ...................................... 93

Sequence of Operation ............................ 94

Unit Operation..................................................... 94

Operating the Chiller Control System... 96

Interface Panel On/Off ........................................ 96

Start/Stop Unit..................................................... 96

Change Setpoints................................................. 97

Alarms ................................................................. 97

Component Failure .............................................. 97

Standby Power..................................................... 97

Maintenance Schedule ............................ 98

McQuay" and MicroTech II are registered trademarks of McQuay International

"Illustrations and information cover McQuay International products at the time of publication and we reserve the right to make changes in design and

2 OM CentrifMicro II-5

ETL applies only to models

Manufactured in an ISO certified facility.



2005 McQuay International

construction at anytime without notice."

Introduction

This manual provides operating, maintenance and troubleshooting information for McQuay centrifugal chillers with MicroTech ΙΙ control and for the majority of starters used on McQuay centrifugal chillers.

Software Version

Software Code: WCFU3UU04C/D/E

Notations stating previous content are made when a new version changes a previous value or statement.

Electric shock hazard. Can cause personal injury or equipment damage. This

equipment must be properly grounded. Connections to and service of the

WARNING

MicroTech control panel must be performed only by personnel that are

knowledgeable

in the operation of the equipment being controlled.

CAUTION

Static sensitive components. A static discharge while handling electronic circuit

boards can damage components. Discharge any static electrical charge

by touching the bare metal inside the control panel before performing

any service work. Never unplug any cables, circuit board terminal blocks,

or power plugs while power is applied to the panel.

NOTICE

This equipment generates, uses and can radiate radio frequency energy and,

if not installed and used in accordance with this instruction manual,

may cause interference to radio communications. Operation of this equipment in a

residential area is likely to cause harmful interference in which case the user

will be required to correct the interference at his own expense.

McQuay International Corporation disclaims any liability resulting

from any interference or for the correction thereof.

CAUTION

Do not install any non-McQuay authorized software or alter operating systems in

any unit microprocessor, including the interface panel. Failure to do so can cause

malfunction of the control system and possible equipment damage.

Temperature and Humidity Limits

The MicroTech ΙΙ controller is designed to operate within an ambient temperature range of 20°F to 130°F (-7°C to 54°C) with a maximum relative humidity of 95% (non-condensing).

OM Centrif Micro ΙΙ-5 3

Features of the Control Panel

• Control of leaving chilled water within a ±0.5°F (±0.3°C) tolerance. Systems with a large water

volume and relatively slow load changes can do better.

• Readout of the following temperature and pressure readings:

• Entering and leaving chilled water temperature

• Entering and leaving condenser water temperature

• Saturated evaporator refrigerant temperature and pressure

• Saturated condenser temperature and pressure

• Suction line, liquid line and discharge line temperatures - calculated superheat for discharge

and suction lines – calculated subcooling for liquid line

• Oil sump temperature - oil feed temperature and pressure

• Optional condenser heat recovery temperature

• Automatic control of primary and standby evaporator and condenser pumps.

• Control of up to 4 stages of cooling tower fans plus modulating bypass valve and/or tower fan

VFD.

• The controller will store and display key historic operating data for recall in a graphic format on

the screen. Data can also be exported for archival purposes via a USB port.

• Three levels of security protection against unauthorized changing of setpoints and other control

parameters.

• Warning and fault diagnostics to inform operators of warning and fault conditions in plain

language. Al1 warnings, problems and faults are time and date stamped so there is no guessing of when the fault condition occurred. In addition, the operating conditions that existed just prior to shutdown can be recalled to aid in isolating the cause of the problem.

• Twenty-five latest faults are displayed on the unit controller, eight can be displayed on the touch

screen. Data can be exported for archival purposes via a 3.5-inch floppy drive.

• Soft loading feature reduces electrical consumption and peak demand charges during loop

pulldown.

• Adjustable load pull-down rate reduces under-shoot during loop pulldown.

• Remote input signals for chilled water reset, demand limiting, unit enable.

• Manual control mode allows the service technician to command the unit to different operating

states. Useful for system checkout.

• BAS communication capability via LONM

BAS manufacturers.

• Service Test mode for troubleshooting controller hardware.

• Pressure transducers for direct reading of system pressures. Preemptive control of high motor

amps, low evaporator pressure conditions and high discharge temperature takes corrective action prior to a fault trip.

ARK

, Modbus or BACnet standard protocols for

4 OM Centrif Micro ΙΙ-5

Digital

Outputs

General Description

The centrifugal MicroTech ΙΙ control system consists of microprocessor-based controllers that provide all monitoring and control functions required for the controlled, efficient operation of the chiller. The system consists of the following components:

• Operator Interface Touch Screen (OITS), one per unit-provides unit information and is the

primary setpoint input instrument. It has no control function.

• Unit Controller, one per chiller-controls unit functions and communicates with all other

controllers. It is the secondary location for setpoint input if the Interface Screen is inoperative. It is located in a panel adjacent to the OITS.

• Compressor Controller for each compressor on a chiller-controls compressor functions and can

operate a compressor without the unit controller or Operator Interface Panel. The controller is located in a panel adjacent to the compressor.

The operator can monitor all operating conditions by using the unit-mounted OITS. In addition to providing all normal operating controls, the MicroTech II control system monitors equipment protection devices on the unit and will take corrective action if the chiller is operating outside of it’s normal design conditions. If a fault condition develops, the controller will shut the compressor or entire unit down and activate an alarm output. Important operating conditions at the time an alarm condition occurs are retained in the controller’s history log to aid in troubleshooting and fault analysis.

The system is protected by a password scheme that only allows access by authorized personnel. The operator must enter the password into the touch screen (or one of the controller's keypad) before any setpoints can be altered.

NOTE: It is important to understand that the OITS is the operator interface device under normal conditions. If, and only if, it is unavailable, the unit controller can be used to operate the chiller. Furthermore, if the unit controller is unavailable, the compressor controller(s) will still operate the compressors and try to maintain chilled water temperature. Certain data and operability will not be available under either of these operating modes. If the MicroTech II controller controls the tower and system pumps, they will have to run manually during this emergency situation.

Control Architecture

Figure 1, Major Control Components

OPERATOR

INTERFACE

TOUCH-SCREEN

Universal

Comm. Module

UNIT

BAS

CONTROLLER

OM Centrif Micro ΙΙ-5 5

pLAN

COMPRESSOR

CONTROLLER

SECOND

COMPRESSOR

CONTROLLER

D3 Starter

Color Graphics

Touch-Screen Interface

View Data, Input Setpoints

Stores History

UNIT

Analog Inputs

Analog Outputs

Digital Inputs

COMPRESSOR

Analog Inputs

Analog Outputs

Digital Inputs

Digital Outputs

ALARM

Component Description

Operator Interface Touch Screen

The operator interface touch screen (OITS) is the primary device by which commands and entries into the control system are made. It also displays all controller data and information on a series of graphic screens. A single OITS is used on both single and dual compressor units.

The control panel contains a USB port that can be used for loading information to and from the controll system.

The OITS panel is mounted on a moveable arm to allow placement in a convenient position for the operator.

There is a screen-saver programed into the system. The screen is reactivated by touching it anywhere.

Unit/Compressor Controller Description

Hardware Structure

The controller is fitted with a 16-bit microprocessor for running the control program. There are terminals for connection to the controlled devices (for example: solenoid valves, tower fans, pumps). The program and settings are saved permanently in FLASH memory, preventing data loss in the event of power failure without requiring a back-up battery.

The controller connects to other controllers and the OITS via a local communications network (pLAN). It also has remote communication access capability for BAS interface.

Keypad

A 4 line by 20 character/line liquid crystal display and 6-button keypad is mounted on the unit and compressor controllers. Its layout is shown below.

Key-to-Screen Pathway

Air Condit ioning

Red Fault Light

MENU Key

VIEW

< <

ARROW Keys

SET

ENTER Key

The four arrow keys (UP, DOWN, LEFT, RIGHT) have three modes of use.

• Scroll between data screens in the direction indicated by the arrows (default mode).

• Select a specific data screen in the menu matrix using dynamic labels on the right side of the

display such as ALARM, VIEW, etc (this mode is entered by pressing the MENU key). For ease of use, a pathway connects the appropriate button to its respective label on the screen.

• Change field values in setpoint programming mode according to the following table:

LEFT key = Default RIGHT key = Cancel UP key = Increase (+) DOWN key = Decrease (-) These four programming functions are indicated by one-character abbreviation on the right side of the display. This programming mode is entered by pressing the ENTER key.

6 OM Centrif Micro ΙΙ-5

Software

The same model controller is used as either a unit controller or a compressor controller. The controller operation is determined by the setting of the controller pLAN address. These settings are all made in the factory during unit testing. Settings are different with multiple chillers and will be set by the startup technician.

The operating software is revised occasionally. The version residing in a given control is identified on the screen at boot-up or can be viewed at any time by pressing the Right and Up Arrows simultaneously. It is also displayed on the OITS SERVICE screen.

Unit Controller

There is one unit controller mounted on the chiller that serves both compressor units.

Unit and compressor on/off switches are mounted in the unit controller panel located adjacent to the OITS panel. They are designated 1 for on and O for off. The compressor on/off switch should only be used when an immediate stop is required since the normal shut down sequence is bypassed.

The switch panel also has a circuit breaker that interrupts power to the cooling tower fans, valves and evaporator and condenser pumps, if any of these are tied into the MicroTech II for control of their operation. If these components operate independently from the chiller control, the breaker has no effect.

There is an emergency shutdown switch located on the left outside of the panel that causes an immediate shutdown of both compressors.

The unit controller's primary function is processing data relating to the entire chiller unit operation, as compared to data relating to the compressor operation. The unit controller processes information and sends data to other controllers and devices and relays information to the OITS for graphic display. It has a 4x20 LCD display and keys for accessing data and changing setpoints. The LCD can display most of the same information as the OITS and can operate the chiller independently if the OITS is not available. Inputs and outputs are shown in the following tables.

Table 1, Unit Controller, Analog Inputs

# Des cription Signal Source Ran ge

Res et of Leaving Water T emperature 4-20 mA Current 0-(10 to 80°F)

Entering E va po ra tor W ater Temperature NTC Thermi ster (10k @25°C) -58 to 212°F

Entering Condens er Water T em perature NTC Thermi ster (10k @25°C) -58 to 212°F

Leavi ng Condenser W at er Temp erat ure NTC Thermister (10k@2 5°C) -58 to 2 12 °F

Liquid Line Refrigerant Tem perature NTC Thermi ster (10k @25°C) -58 to 212°F

Dem and Lim it 4-20 mA Current 0-100 %RLA

Evaporator W ate r Flow 4 to 20 mA Current 0 to 10, 00 0 gpm

Con denser Water Flow 4 to 20 mA Current 0 to 10, 00 0 gpm

Entering Heat Recovery Temp. NTC Therm ist er (10k@25°C) -58 to 212°F

Leavi ng Heat Rec ov er y Temperatu re NTC Thermi ster (10k @25°C) -58 to 212°F

B10

Table 2, Unit Controller, Digital Inputs

# Description Signal Signal

Unit OFF Switch 0 VAC (Stop) 24 VAC (Auto)

ID1

Remote Start/Stop 0 VAC (Stop) 24 VAC (Start)

ID2

Mode Switch 0 VAC (Cool) 24 VAC (Ice or Heat)

ID3

OM Centrif Micro ΙΙ-5 7

Table 3, Unit Controller, Digital Outputs

# Description Load Output OFF Output ON

NO1 NO2 NO3 NO4 NO5 NO6 NO7 NO8 NO9

NO10

Primary Evaporator Water Pump Pump Contactor Pump OFF Pump ON Standby Evaporator Water Pump Pump Contactor Pump OFF Pump ON Primary Condenser Water Pump Pump Contactor Pump OFF Pump ON Standby Condenser Water Pump Pump Contactor Pump OFF Pump ON Tower Fan #1 Fan Contactor Fan OFF Fan ON Tower Fan #2 Fan Contactor Fan OFF Fan ON (unused) Alarm Alarm Indicator Alarm OFF Alarm ON Tower Fan #3 Fan Contactor Fan OFF Fan ON Tower Fan #4 Fan Contactor Fan OFF Fan ON

Table 4, Unit Controller, Analog Outputs

# Description Output Signal Range

Cooling Tower Bypass Valve Position 0 to 10 VDC 0 to 100% Open

Cooling Tower VFD Speed 0 to 10 VDC 0 to 100%

Electronic Expansion Valve (EEV) 0 to 10 VDC 0 to 100% Open

Compressor Controller

The compressor controller's primary function is controlling and protecting the compressor. No setpoint inputs are made with it. There is one compressor controller for each compressor on a dual chiller unit. The compressor controller receives, processes, and sends data to other controllers and devices and to the compressor starter or variable frequency drive (VFD). With some operator intervention the compressor controller can operate the compressor(s) if the unit controller and/or the operator interface touch screen are unavailable. Inputs and outputs are as follows:

Table 5, Compressor Controller, Analog Inputs

# Description Signal Source Range

Oil Sump Pressure 0.5 to 4.5 VDC 0 to 150 psi

Oil Supply Pressure to Compressor 0.5 to 4.5 VDC 0 to 450 psi

Evaporator Refrigerant Pressure 0.1 to 0.9 VDC 0 to 150 psi

Oil Sump Temperature NTC Thermister (10k@25°C) -58 to 212°F

Compressor Suction Temperature NTC Thermister (10k@25°C) -58 to 212°F

Condenser Refrigerant Pressure 0.5 to 4.5 VDC 0 to 450 psi

Compressor Discharge Temperature NTC Thermister (10k@25°C) -58 to 212°F

Motor Current 0.5 to 4.5 VDC 0 to 125% RLA

Oil Feed Temperature NTC Thermister (10k@25°C) -58 to 212°F

Leaving Evaporator Water Temperature NTC Thermister (10k@25°C) -58 to 212°F

B10

Table 6, Compressor Controller, Digital Inputs

# Description Signal Signal

Manual Off 0 VAC (Off) 24 VAC (Auto)

ID1

Mech High Pressure 0 VAC (High Pressure ) 24 VAC (OK)

ID2

Motor High Temperature 0 VAC (High Temp) 24 VAC (OK)

ID3

Vanes Closed Switch 0 VAC (Not Closed) 24 VAC (Closed)

ID4

Starter Transition 0 VAC (No Transition) 24 VAC (Transition)

ID5

Starter Fault 0 VAC (Fault) 24 VAC (No Fault)

ID6

Evap Flow 0 VAC (N0 Flow) 24 VAC (Flow)

ID7

Cond Flow 0 VAC (N0 Flow) 24 VAC (Flow)

ID8

Vanes Open Switch 0 VAC (Not Open) 24 VAC (Open)

ID9

8 OM Centrif Micro ΙΙ-5

Table 7, Compressor Controller, Analog Outputs

# Description Output Signal Range

Compressor VFD Speed 0 to 10 VDC 0 to 100%

Open

Oil Cooler 0 to 10 VDC 0 to 100%

Hot Gas Bypass 0 to 10 VDC 0 to 100%

Table 8, Compressor Controller, Digital Outputs

# Description Load Output OFF Output ON

NO1 NO2 NO3 NO4 NO5 NO6 NO7

NO/C8

Motor Control Relay Starter Compressor OFF Compressor ON Hot Gas Bypass Solenoid No Bypass Bypass Liquid Injection Solenoid No Injection Injection Oil Pump Pump Contactor Pump OFF Pump ON Oil Sump Heater Heater Heater OFF Heater ON Oil Cooler Solenoid Cooling OFF Cooling ON Vane Pulse Solenoid Hold Move Vanes Load/Unload Solenoid Unload Load

Guardister Board

The Guardister board monitors the motor winding temperature through embedded Guardistor temperature sensors in the motor. If the motor temperature rises to an unsafe level, the board will signal the compressor controller and the compressor will shut down.

Signal Converter Board

On medium voltage starters, the AC current signal generated by the starter is converted by the separate signal board into a 0-5 VDC signal that is directly proportional to the compressor motor amp draw. The amp draw signal is sent to the compressor controller.

On low voltage starters, the D3 starter feature eliminates the need for this board.

Transducer Converter Board

The transducer converter board converts the pressure transducer signal to the correct voltage signal and relates it to the compressor controller.

PLAN Isolator

Provides voltage isolation on the pLAN (RS485) when interconnecting chillers on the pLAN.

OM Centrif Micro ΙΙ-5 9

Field Wiring Diagram

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 McQuay specification 7359999 Rev 29 available on mcquay.com. 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 McQuay 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.

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. WDC dual compressor units require DPDT switches. 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.

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 selection shall be based on 58 percent of the motor rated load amperes (RLA). 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 McQuay sales office and also shipped with each unit: Modbus IM 743 LONW

14. The “Full Metering” or “Amps Only Metering” option will require some field wiring when freestanding starters are used. Wiring will depend on chiller and starter type. Consult the local McQuay sales office for information on specific selections.

ORKS

IM 735 BACnet IM 906

10 OM Centrif Micro ΙΙ-5

CP2

CP1

NOTE 2

T3-S

23(5A)

EP2

EP1

L1L2L3

T4T5T6

T1T2T3

T4T5T6T1T2

T1T2T3

T3T1T2

T4T3T5T1T6

T1T2T3

T4T3T5T1T6

1-10 VDC

MICROTECH CONTROL

MICROTECH

- FOR DC VOLTAGE AND 4-20 MA

- FOR DETAILS OF CONTROL REFER

Figure 2, Field Wiring Diagram

BOX TERMINALS

(115V) (24V)

* COOLING

TOWER

FOURTH

STAGE

STARTER

* NOTE 10

GND

POWER

* NOTE 7

NEUTRAL

* COOLING

TOWER

THIRD

STAGE

STARTER

* COOLING

TOWER

SECONDH

STAGE

STARTER

* COOLING

TOWER

FIRST

STAGE

STARTER

* NOTE 10

COOLING TOWER

BYPASS VALVE

COOLING TOWER VFD

COMMON

POWER

82(NO)

83(NC)

ALARM RELAY

(NOTE 4)

COMPRESSOR

MOTOR

STARTER

(NOTE 1)

-LOAD-

NOTE: See notes on previous page.

OM Centrif Micro ΙΙ-5 11

COMPRESSOR CONT ROL

GND

CP1

CP2

24(5)

BOX TERMINALS

CTB1

115 VAC

LESS THAN 30V OR 24VAC

STARTER LOAD SIDE TERMINBALS

VFD

COMPRESSOR TERMINALS

WYE-DELTA

COMPRESSOR TERMINALS

SOLID STATE

COMPRESSOR TERMINALS

MEDIUM AND HIGH VOLTAGE

COMPRESSOR TERMINALS

CONNECTIONS (SEE NOTE 3)

TO UNIT CONTROL SCHEMATIC 330342101

- COMPRESSOR CONTROL SCHEMATIC 330342201

- LEGEND: 330343001

* FIELD SUPPLIED ITEM

NOTE 12

330387901-0A

Dual/Multi-Chiller Operation

Multiple Chiller Setup

Single compressor chillers WSC and dual compressor chillers WDC and WCC have their main control components factory wired to an internal pLAN network so that they 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 (McQuay P/N

330276202), and some MicroTech II control settings (see special WCC instructions at the end of this section). 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 McQuay 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

pLAN address as shown in Table 9.

2. With all manual switches off, turn on control power to each chiller and set each OITS

address (see Note 2 on page 14).

3. Verify correct nodes on each OITS Service Screen.

4. Connect chillers together (pLAN, RS485 wiring) as shown in Figure 3. 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 touchscreen 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 Four 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.

12 OM Centrif Micro ΙΙ-5

Chiller A

UCM

J10

J11

BLU/WHT

WHT/BLU

(+)

(-)

UNIT CONTROL

Figure 3, Communication Wiring

485

OPDR

UCM

BLU/WHT

WHT/BLU

SHIELD

PIGTAIL

485

OPDR

SHIELD

Chiller B

J10

PORT

UNIT CONTROL

J11 PORT

(+) (-)

J11 Port

Chiller C

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

OM Centrif Micro ΙΙ-5 13

Table 9, pLAN address and DIP Switch Settings for Controllers Using pLAN.

Chiller

(1)

Comp 1

Controller Dec. 1 2 5 6 7 8 Bin. 100000 010000 101000 011000 N/A 000100 Dec. 9 10 13 14 15 16 Bin. 100100 010100 101100 011100 N/A 000010 Dec. 17 18 21 22 23 24 Bin. 100010 010010 101010 011010 N/A 000110 Dec. 25 26 29 30 31 32 Bin. 100110 010110 101110 011110 N/A 000001

Comp 2

Controller

Unit

Controller

Reserved Operator

Interface (2)

Reserved

NOTES for pLAN multi-chiller communication setup:

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

2. 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 letters 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. For the pCo2 controller, the pLAN address can be confirmed by viewing the DIP switch positions and

comparing to (see picture below)

Table 9

(Bin. rows). Up is ‘On’, indicated by ‘1’. Down is ‘Off’, indicated by ‘0’.Operation.

4. For the pCo3 controller, there are no DIP switches as shown below.

14 OM Centrif Micro ΙΙ-5

The pLAN address can only be confirmed as follows: A) Disconnect pLAN (connectors J10 and J11) from all pCo2 and pCo3 controller(s). B) Cycle power to the controller and then hold down both the Left Arrow (alarm) and the Up Arrow keys

simultaneously as the controller completes its Self-Test routine. The controller will then show you the present pLAN address of the controller. Verify that the pLAN address matches the desired address from the above table (Dec. rows). If the address needs to be changed, follow the instructions displayed on the pCo3 controller’s LCD display. Press enter when done.

C) Only after all controllers pLAN addresses have been set/confirmed can the pLAN network connectors be

re-connected.

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 touchscreen, 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.

WCC Settings

Since the WCC is essentially two chillers combined into one counterflow, single pass, dual-circuit chiller, the compressor on the downstream circuit (leaving chilled water) must always be designated as the Stage 1 compressor-first on, last off.

OM Centrif Micro ΙΙ-5 15

Ice Mode Operation

If available modes is set to ICE only the chiller will start (at start delta t) and run the Ice cycle described as follows: The chiller will ignore softload and all Demand limits and rapidly load up to Maximum Amps setpoint. The compressor(s) do not unload. If the chiller has dual compressors (WDC), the lead compressor will unload approx. one minute after starting to allow the second compressor to start (at reduced lift pressure), then both compressors will load to Max Amps. When both compressors have achieved the Ice LWT setpoint both compressors will shutdown. The Evap pump will continue to run and if the Evap LWT climbs to the Start Delta T the chiller will restart this process.

The following failsafe feature has been incorporated into the code. If one compressor reaches the Stop Delta Temp (below the setpoint) before the other compressor has achieved the setpoint, both compressors will shutdown.

If available modes is set to Cool/Ice with Ice mode operation selected, the chiller will run one ICE cycle and shutdown (compressors and pumps) no automatic restart allowed. When the operator switches the chiller from Ice to Cool mode the chiller will reset for operation. Changing modes can be done through the OITS, switches or BAS interface, which ever is selected.

Some sort of migration freeze protection needs to be in place when the chiller terminates ice mode. This is usually sensed by the liquid line sensor and forces a condenser pump to circulate to prevent freeze up of the condenser.

Operator Interface Touch Screen

Navigation

The home screen shown in VIEW screen on page 18 is usually left on (there is a screen-saver built in that is reactivated by touching the screen anywhere). This VIEW screen contains the STOP and AUTO buttons used to start and stop the unit when in Local control. Other groups of screens can be accessed from the Home screen by pressing one of three buttons on the bottom of the screen; HISTORY, VIEW, SET.

• HISTORY will go to the last history screens viewed and can toggle between the two history screens.

• Trend History

• Alarm History

• VIEW will go to the next View screen and other sub-View screens used to look in detail at settings and the

operation of the chiller. Pressing View from any other screen will return to the Home View screen.

• SET will go to a series of screens used to set setpoints.

The figure on the following page illustrates the arrangement of the various screens available on the OITS. A few minutes practice on an actual OITS should provide a comfortable level of confidence in navigating through the screens.

16 OM Centrif Micro ΙΙ-5

ALARM

ALARMS

VALVE (TOWER)

HISTORY

CHILLER

POWER

Figure 4, OTIS Screen Layout

SET SCREENS

HOME

SCREEN

SET

PRESS VIEW

SETPOINTS

EACH GROUP OF SETPOINTS HAVE

SETTING AND RANGE

EXPLAINED ON SCREEN

PRESS SET

SEE FIGURE 12

TOWER (FANS)

TIMERS

MOTOR

MODES

HOME

SCREEN

HISTORY

TREND

HISTORY

PRESS HISTORYPRESS VIEW

LABELED BAR GRAPHS

BAR GRAPHS

VIEW SCREENS

PRESS VIEW

PRESS MENU

WATER

HOME

SCREEN

VIEW

DETAIL

VIEW

SCREEN

SEE FIGURE 4

PRESS VIEW

SEE FIGURE 5

PRESS VIEW

SEE FIGURE 7

COMPRESSOR STATE

COMPRESSOR I/O

UNIT I/O

SEE FIGURE 10

SEE FIGURE 8

SEE FIGURE 9

Pressing VIEW from any sub-menu will toggle back to the home screen. Pressing MENU when in any sub-menu will return to the view screen.

Pressing SET or HISTORY will go to these groups of menus.

OM Centrif Micro ΙΙ-5 17

EVAPORATOR

CONDENSER

Screen Descriptions

VIEW Screens

View screens are used for looking at unit status and conditions.

Figure 5, Home View Screen, Dual Compressor Unit

Home View Screen

The Home View Screen shows the basic condition of the chiller and is the screen that is normally left on. Dual compressor (WDC, WCC) units, as shown, will show two compressors and the status of both. Single Compressor units (WSC, TSC) will show only the one compressor. The pressures and temperatures shown are common to the unit and correct for both single and dual compressor chillers. Superimposed on a chiller schematic is:

Information

• Active chilled water setpoint

• Entering and leaving chilled water temperatures

• Entering and leaving condenser water temperatures

• Percent motor amps

• UNIT STATUS is MODE followed by STATE followed by the SOURCE that is the device or

signal that created the STATE. The possible combinations are in the following table:

18 OM Centrif Micro ΙΙ-5

Table 10, UNIT STATUS Combinations

MODE STATE SOURCE

COOL OFF Manual Switch

ICE SHUTDOW N (Note 1) Remote Switch

HEAT AUTO Local

BAS Network

TEST

Note: Shutdown is the state of shutting down; vane close, postlube, etc.

• COMPRESSOR STATUS is MODE followed by STATE followed by the SOURCE that is the

device or signal that created the STATE. The possible combinations are in the following table

Table 11, COMPRESSOR STATUS Possibilities

Complete STATUS Text

(in priority sequence)

OFF Manual Switch

OFF Compressor Alarm

OFF Unit State

OFF Evap Flow/Re-circulate

OFF Low Oil Sump Temp

OFF Start to Start Timer=xxx

OFF Stop to Start Timer=xxx

OFF Staging (Next ON)

OFF Awaiting Load

PRELUBE Vanes Open

PRELUBE Timer=xxx

PRELUBE Condenser Flow

RUN Unload Vanes-Max Amps

RUN Hold Vanes-Max Amps

RUN Manual Vanes & Speed

RUN Load Vanes-Manual Speed

RUN Hold Vanes-Manual Speed

RUN Unload Vanes-Manual Speed

RUN Load Speed-Manual Vanes

RUN Hold Speed-Manual Vanes

RUN Unload Speed-Manual Vanes

RUN Unload Vanes-Lag Start

RUN Hold Vanes-Evap Press

RUN Unload Vanes-Evap Press

RUN Unload Vanes-Soft Load

RUN Hold Vanes-Soft Load

RUN Load Vanes-Disch Temp

RUN Hold Vanes-Pull-down Rate

RUN Unload Vanes-Demand Limit

RUN Hold Vanes-Min Amps

RUN Load Vanes

RUN Hold Vanes

RUN Unload Vanes

SHUTDOWN Unload Unloading during the shutdown sequence

POSTLUBE Timer=xxx Postlube timer on

POSTLUBE Motor Current High Compressor motor running during the shutdown mode. It should be off.

Used for service purposes. "T" password required. Operated from

Reason for the compressor being off.

Current state of the Prelube sequence

Overrides water temperature command

Notes

compressor controller

Normal operation

NOTES:

1. Timer countdown values will be shown where “(xxx)” is shown below.

2. For a VFD equipped compressor, “Vanes” or “Speed” is shown in the RUN state to indicate if the capacity is

controlled by speed from the VFD or by vane control.

3. When the compressor is in the START state (oil pump started but still waiting for oil pressure), “PRELUBE –

Vanes Open” or “PRELUBE – Timer=(xxx)” is shown as appropriate.

OM Centrif Micro ΙΙ-5 19

Action Buttons for:

• AUTO and STOP buttons, normal start (AUTO) and STOP button activates the normal start

and shutdown sequence. These buttons are only active when the control is in the "Local Control" mode. This eliminates the possibility of inadvertently shutting off the unit locally when it is under control of a remote signal such as a BAS.

• HISTORY, toggles between the Trend History screen and the Alarm History screen.

• SET, toggles between the Set Points screen that are used for changing setpoints and the

Service screen.

Returning

Pressing the VIEW button from any screen will return to the HOME VIEW screen.

Figure 6, Detail View Screen

Pressing the VIEW button on the bottom of the Home View screen (Figure 5) accesses the Detail View Screen shown above. This screen gives additional information on the refrigerant pressures and temperatures and lubricant data.

Pressing the STATE button will bring up a display of the compressor state as described in Figure 9 on page 22.

Pressing the I/O button displays the status of the compressor inputs and outputs as described on page 22. Dual compressor units will have a COMP button that will toggle between the two compressors' data, allowing the STATE and I/O detail screens to be viewed for either compressor.

Pressing the UNIT I/O button displays the unit inputs and outputs as described in Figure 11 on page 1.

20 OM Centrif Micro ΙΙ-5

Figure 7, Expanded Power View Screen

Pressing the EVAP or COND button will give detailed information on the evaporator or condenser pressures and temperatures.

Pressing the MENU button on the bottom of the screen will go to a menu (see Figure 8) from which the above listed screens can also be accessed.

Pressing the POWER button will access a screen showing power data for the unit. The ability to view the unit’s electrical performance and to set starter setpoints on the interface screen is an optional extra available at the time of purchase. If the option is supplied on the unit, a “POWER” button will be visible on the upper left side of the VIEW screen. Pressing the button will open the screen shown in Figure 7.

The screen shown to the right will be superimposed on the right side of the VIEW screen shown in Figure 6 when the optional “Full Meter Display” is included with the unit. This screen will remain visible until another display button; such as STATE, I/O, etc is pressed.

If this option is not included, Percent Unit RLA on the HOME VIEW screen displays the current percent of the unit rated loads amps.

Figure 8, View Menu

This View Menu is accessed by pressing the MENU button from the Detail View Screen. The menu screen is used to access other screens containing various data. A screen with unit temperatures and pressures is shown on a BAR CHART SCREEN (see Figure 12 on page

23). This screen is accessed by pressing LABELED BAR GRAPHS. Pressing BAR GRAPHS will access the same screen, but without the labels

There is more data available to view and it is accessed through the buttons on the right of the screen. It is segregated by general topics that are selfexplanatory. These buttons are also repeated on the Detail View Screen as previously noted. If the starter display option has been included, a POWER button will be located above the STATE button.

OM Centrif Micro ΙΙ-5 21

Figure 9, View Compressor State Screen

For example, pressing the Compressor-State button will yield the following screen superimposed on the right side of the Detail View Screen. The Compressor State screen is basically a compilation of the events that the chiller sequences through at startup. A green light (light gray in the figure) indicates that a particular sequence requirement has been satisfied. It is recommended that this screen be viewed during the start up sequence. One can see the requirements light up as they are met and quickly see why a non-start may have occurred. For example, The Evap Flow OK will light when the evaporator flow switch is closed by flow, Oil Sump Temp OK will light if (or when) the oil temperature is above the Startup Temperature Setpoint, both timers must be timed out, Oil Pressure OK will light when sufficient oil pressure is achieved, etc.

The bottom three sections (from "RUN" down) are in effect during the shut down process. The compressor is officially off when the Postlube Timer is Done. The sequence transitions back to OFF at this point and the OFF light will be illuminated.

Figure 10, View Compressor Input/Output Status

Pressing the Compressor I/O button on the VIEW MENU screen will access the screen shown to the right. It is superimposed on the right side of the Detail View Screen. It gives the status of the compressor digital inputs and analog and digital outputs. Many of these I/Os also appear in the Compressor State screen since they are part of the start up sequence and define the compressor state at any given time. Dual compressor units will have two of any compressor screen.

A COMP button will appear in the lower lefthand corner of the Detail View Screen (Figure 6 on page 20) on dual compressor WDC units. This button will toggle compressor data from #1 compressor to #2 compressor.

22 OM Centrif Micro ΙΙ-5

Figure 12, Bar Chart with Labels

The bar chart screen is accessed from the MENU screen (Figure 8) by selecting LABELED BAR GRAPHS. Selecting BAR CHARTS will access the same graph, but without the labels.

SET Screens

The set screens on the Interface Panel are used to input the many setpoints associated with equipment of this type. MicroTech II provides an extremely simple method for accomplishing this. (NOTE: If the Interface Panel is unavailable, the unit controller can be used to change setpoints.) Appropriate setpoints are factory set and checked by McQuayService or Factory Authorized Service Company during commissioning. However, adjustments and changes are often required to meet job conditions. Certain settings involving pumps and tower operation are field set.

Pressing the SET button found on almost every screen accesses the last SET screen used or the SERVICE screen, whichever of the two was used last.

When in any SET screen, pressing the SET button again will toggle to the SERVICE screen shown on page 37.

OM Centrif Micro ΙΙ-5 23

Groups

Buttons

Figure 13, A Typical SETPOINT Screen

Setpoint

Description

Numeric

Keypad

Action

Setpoints

Setpoint

Selection

Setpoint

Initiate

Change

Button

The above figure shows the SETPOINT screen with WATER setpoints selected. The various setpoint groups are in a column on the right side of the screen. Each button contains a number of setpoints grouped together by similar content. The WATER button (as shown) contains various setpoints relating to water temperatures. If either starter display option has been included, an additional button, STARTER, will be located above the TIMERS button.

NOTE: Some setpoints that do not apply to a particular application may still be listed on the screen. They will be inactive and can be ignored. For example, of setpoints 1, 2, and 3 above, only one will be active depending on the unit mode selected in the MODE setpoints, 10 and 11 only for Templifiers.

The numbered buttons in the second from right column are pressed to select a particular setpoint. The selected setpoint will appear in blue on the screen and a description of it (with the range of available settings) will appear in the upper left-hand box.

Procedure for Changing a Setpoint

A list of setpoints, their default value, their available setting range, and password authority are in Table 23 on page 51 for the unit and Table 24 on page 63 for the compressor.

1. Press the applicable Setpoint Group Button. A complete explanation of setpoint content of

each group follows this section.

2. Select the desired setpoint by pressing the numbered button.

3. Press the CHANGE button indicating that you wish to change a setpoint value. The

KEYBOARD screen will be turned on automatically for entering the password.

• O = Operator level password is 100

• M = Manager level password is 2001

• T = Technician level password is reserved for authorized technicians

24 OM Centrif Micro ΙΙ-5

4. Press the appropriate numbers in the numeric keyboard to enter the password. There is a small

delay between pressing the keypad and recording the entry. Be sure that an asterisk appears in the window before pressing the next number. Press ENTER to return to the SETPOINT screen. The password will remain open for 15 minute after initiation and does not need to be re-entered during this period.

5. Press CHANGE again. The right side of the screen will turn blue (inactive).

6. The numeric keypad and action buttons in the lower left-hand corner of the screen will be

activated (the background will turn green). Setpoints with numeric values can be changed in two ways:

• Select the desired value by pressing the numbered buttons. Press ENTER to enter the

value or CANCEL to cancel the transaction.

• Press the UP or DOWN button to increase or decrease the value displayed. Press ENTER

to enter the value or CANCEL to cancel the transaction.

Some setpoints are text rather than numeric values. For example, LWT Reset Type can be "None" or "4-20 ma". The selection can be made by toggling between choices using the UP or Down button. If dashed lines appear in the setpoint window, it indicates that you have toggled too far and need to reverse direction. Press ENTER to enter the choice or CANCEL to cancel the transaction.

Once CHANGE is selected, the CANCEL or ENTER buttons must be pressed before another setpoint can be selected.

7. Additional setpoints can be changed by selecting another setpoint on the screen or by selecting

an entirely new group of setpoints.

Explanation of Setpoints

Each of the seven setpoint group of screens are detailed in the following section. In many cases the setpoint content is obvious and no explanation is included.

1. TIMERS, for setting timers such as start-to-start, prelube, postlube, etc.

2. ALARMS, for setting the limit and shutdown alarms.

3. VALVE, sets the parameters for operation of an optional field installed tower bypass valve.

4. TOWER, selects the method of controlling the cooling tower and sets the parameters for fan

staging/VFD.

5. MOTOR, selects motor related setpoints such as amp limits, VFD settings, etc. Also has

maximum and minimum rate of change of chilled water temperature.

6. MODES, selects various modes of operation such as control source, multiple compressor

staging, pump staging, BAS protocol, etc.

7. WATER, leaving water temperature setpoint, start and stop delta-T, resets, etc.

OM Centrif Micro ΙΙ-5 25

STARTER SETPOINTS

Figure 14, Optional Starter Setpoint Screen

Table 12, Starter Setpoints

Description No. Default Range

Ground Fault Current Trip 8 1 % 1 to 100% RLA M

Ground Fault Enable 7 OFF On or OFF M Turns the ground fault option on or off

Maximum Current Unbalance 6 10% 5% to 40% T

Starter Ramp Time 5 15 sec. 0 to 30 seconds T

Maximum Starter Current 4 600%

Initial Starter Current 3 100%

Rated load Amps 2 1 A

Full Load Amps 1 1 A

100% to 800%

of FLA (SP1)

50% to 400% of

FLA (SP1)

Factory set at

design conditions

Factory set to

motor max current

rating

Password

Sets the value for ground current above which the compressor will be shut down

Sets the value for current unbalance above which the compressor will be shut down Sets the time the starter ramps up the motor current Sets the maximum current when the

compressor starts Sets the initial current when the

compressor starts Value that gives the 100% RLA value and

used for motor protection

T Value used to compute SP3 and SP4

Comments

The setpoints shown above are for solid state starters. Other types of starters will have slightly different setpoints. Units without the starter display option will have their setpoints set in the starter itself.

26 OM Centrif Micro ΙΙ-5

TIMERS Setpoint

Figure 15, TIMERS Setpoint Screen

Table 13, TIMER Setpoints

Description No. Default Range

Postlube Timer 8 30 sec 10 to 240 sec T Time for postlube before compressor can stop Unload Timer 7 30 sec 10 to 240 sec T Time compressor will unload before going to postlube Full Load Timer 6 300 sec 0 to 999 sec T Time compressor must load for full open vanes Interlock 5 WMC only Prelube Timer 4 30 sec 10 to 240 sec T Time compressor must prelube before starting

Stop-Start 3 3 min 3 to 20 min M

Start-Start 2 40 min 15 to 60 min M

Evap Recirculate

1 30 sec

15 sec to 5

min

Pass-

word

Comments

Time from when compressor stops to when it can restart Time from when compressor starts to when it can start again Time that evaporator pump must run before compressor start

OM Centrif Micro ΙΙ-5 27

ALARMS Setpoint

Figure 16, ALARMS Setpoint Screen

Table 14, ALARM Setpoints

Description No. Default Range

Low Net Oil Pressure 14 50 psi 50 to 90 psi T Min net pressure (feed minus sump)

Low Oil Delta Temperature 13

High Oil Feed Temperature 12 Condenser Freeze 11

Evaporator Freeze 10

Motor Current Threshold 9 10% 3% to 99% T Min %RLA to consider motor off

Surge Slope Limit 8 20 1 – 99 deg F/min. T Surge slope temp that triggers alarm Surge Temperature Limit 7 6 2 – 25 deg F T See screen above High Discharge Temp-

Shutdown High Discharge Temp-Load 5

High Condenser Pressure 4 140 psi 120 to 290 psi T

Low Evap Pressure, Stop 3 29 psi 10 to 45 psi T Min evap pressure – stop compressor Low Evap Pressure-Unload 2 31 psi 20 to 45 psi T Min evap pressure – unload compressor Low Evap Pressure-Inhibit 1 33 psi 20 to 45 psi T Min evap pressure – inhibit loading

40 °F 20 to 80 °F

140 °F 120 to 240 °F

34.0 °F -9.0 to 45.0 °F

190 °F 120 to 240 °F

170 °F 120 to 240 °F

Pass-

word

T Min Delta-T (sat evap minus oil temp)

T Max oil temperature T Minimum cond. sat. temp. to start pump

T Minimum evap. sat. temp. to start pump

Max discharge gas temp, stop

compressor

T Max discharge gas temp – load comp

Max discharge pressure, stop compressor

Comments

28 OM Centrif Micro ΙΙ-5

Cooling Tower Bypass VALVE Settings

Figure 17, Tower Bypass VALVE Setpoint Screen

Table 15, Tower Bypass VALVE Setpoints (See page 31 for complete explanation.)

Description No. Default Range

Slope Gain 15 25 10 to 99 M Control gain for temperature (or lift) slope

Error Gain 14 25 10 to 99 M Control gain for temperature (or lift) error

Valve Control Range(Max) 13 100% 0 to 100% M

Valve Control Range (Min) 12 10% 0 to 100% M Minimum valve position, overrides all other settings

Temp - Maximum Position 11

Maximum Start Position 10 100% 0 to 100% M

Temp - Minimum Position 9

Minimum Start Position 8 10% 0 to 100% M

Stage Down @ 7 20% 0 to 100% M

Stage Up @ 6 80% 0 to 100% M

Valve Deadband (Lift) 5 4.0 psi

Valve Deadband (Temp) 4

Valve Target (Lift) 3 30 psi

Valve Setpoint (Temp) 2

Valve Type 1

90 °F 0 to 100 °F

60 °F 0 to 100 °F

1.0 to 20.0 psi

2.0 °F

65 °F

NC (To Tower)

1.0 to 10.0

°F

10 to 130

psi

40 to 120

°F

NC, NO M Normally closed or normal open to tower

Pass-

word

Maximum valve position, overrides all other settings

Condenser EWT at which valve should be open to

tower Initial valve position when condenser EWT is at or above Setpoint # 9 Condenser EWT at which initial valve position is

set to Setpoint # 6 Initial position of valve when condenser EWT is at or below Setpoint # 7 Valve position below which the fans can stage down (Tower Setpoint #2 = Valve Stage Down VFD speed below which the next fan speed can turn off (Tower Setpoint # 2 = valve/VFD ???? Valve position above which the fans can stage up (Tower Setpoint #2 = Valve Stage Down VFD speed above which the next fan speed can turn on (Tower Setpoint # 2 = valve/VFD ????

M Control deadband, Tower Setpoint #1=Lift

M Control deadband, Tower Setpoint #1=Temp

Target for lift pressure (Tower Setpoint #1= Lift),

Works with Setpoint # 5 Target for condenser EWT (Tower Setpoint #1=

Temp), Works with Setpoint # 4

Comments

OM Centrif Micro ΙΙ-5 29

Cooling TOWER Fan Settings

Figure 18, Cooling TOWER Fan Setpoint Screen (See page 31 for complete explanation.)

Table 16, Tower Fan Settings

Description No. Default Range

Stage #4 On (Lift) 15 65 psi 10 to 130 psi M Lift pressure for fan stage #4 on

Stage #3 On (Lift) 14 55 psi 10 to 130 psi M Lift pressure for fan stage #3 on

Stage #2 On (Lift) 13 45 psi 10 to 130 psi M Lift pressure for fan stage #2 on

Stage #1 On (Lift) 12 35 psi 10 to 130 psi M Lift pressure for fan stage #1 on

Stage #4 On (Temp) 11

Stage #3 On (Temp) 10

Stage #2 On (Temp) 9

Stage #1 On (Temp) 8 Stage Differential (Lift) 7 6.0 psi 1.0 to 20.0 psi M Fan staging deadband with Setpoint # 1=Lift Stage Differential

(Temp)

Stage Down Time 5 5 min 1 to 60 min M

Stage Up Time 4 2 min 1 to 60 min M

Tower Stages 3 2 1 to 4 M Number of fan stages used

Valve/VFD Control 2 None

Tower Control 1 None

85 °F 40 to 120 °F

80 °F 40 to 120 °F

75 °F 40 to 120 °F

70 °F 40 to 120 °F

3.0 °F 1.0 to 10.0 °F

None, Valve

Setpoint, Valve

Stage, VFD

Stage, Valve

SP/VFD Stage

None,

Temperature,

Lift

Pass-

word

M Temperature for fan stage #4 on

M Temperature for fan stage #3 on

M Temperature for fan stage #2 on

M Temperature for fan stage #1 on

M Fan staging deadband with Setpoint #1=Temp

Time delay between stage up/down event and next stage down Time delay between stage up/down event and next stage up

None: No tower valve or VFD Valve Setpoint: Valve controls to VALVE SP3(4) & 5(6)

Valve Stage: Valve control setpoint changes to fan stage setpoint VFD Stage: 1st fan is VFD controlled, no valve Valve Setpoint/VFD Stage: Both valve and VFD None: No tower fan control

Temperature: Fan and valve controlled by EWT Lift: Fan and valve controlled by lift pressure

Comments

30 OM Centrif Micro ΙΙ-5

Explaination of Tower Control Settings

MicroTech II control can control cooling tower fan stages, a tower bypass valve, and/or a tower fan VFD if the chiller has a dedicated cooling tower.

The Tower Bypass Valve position will always control the Tower Fan Staging if Valve Setpoint, Stage Setpoint is selected. Fan staging is determined by Min & Max Tower Valve Position.

There are five possible tower control strategies as noted below and explained in detail later in this section. They are selected from SETPOINT TOWER SP2.

1. NONE, Tower fan staging only. In this mode the tower fan staging (up to 4 stages) is

controlled by either the condenser Entering Water Temperature (EWT) or LIFT pressure (difference between the condenser and evaporator pressures). Tower bypass or fan speed are not controlled.

2. VALVE SP, Tower staging with low-limit controlled bypass valve. In this mode the tower fans

are controlled as in #1 plus a tower bypass valve is controlled to provide a minimum condenser EWT. There is no interconnection between the fan control and the valve control.

3. VALVE STAGE, Tower staging with stage controlled bypass valve. In this mode the bypass

valve controls between fan stages to smooth the control and reduce fan cycling

4. VFD STAGE. In this mode a VFD controls the first fan. Up to 3 more fans are staged on and

off and there is no bypass valve.

5. VALVE/VFD, Tower fan control with VFD plus bypass valve control.

Tower Fan Staging Only (NONE)

The following settings are used for the Tower Fan Staging Only mode, (SP= setpoint)

1) TOWER SETPOINT Screen

i) SP1. Select TEMP if control is based on condenser EWT or LIFT if based on

compressor lift expressed in psi.

ii) SP2. Select NONE for no bypass valve or fan VFD control.

iii) SP3. Select one to four fan outputs depending on the number of fan stages to be used.

More than one fan can be used per stage through the use of relays.

iv) SP4. Select STAGE UP TIME from 1 to 60 minutes. The default value of 2 minutes is

probably a good starting point. The value may need to be adjusted later depending on actual system operation.

v) SP5. Select STAGE DOWN TIME from 1 to 60 minutes. The default value of 5 minutes

is probably a good starting point. The value may need to be adjusted later depending on actual system operation.

2) If TEMP is selected in SP1, use

i) SP6. Select STAGE DIFFERENTIAL in degrees F, start with default of 3 degrees F.

ii) SP8-11. Set the STAGE ON temperatures consistent with the temperature range over

which the condenser EWT is desired to operate. The default values of 70°F, 75°F, 80°F and 85°F are a good place to start in climates with moderate wet bulb temperatures. The number of STAGE ON setpoints used must be the same as SP3.

3) If LIFT is selected in SP1, use

i) SP7. Select STAGE DIFFERENTIAL in PSI. Start with default of 6 PSI.

ii) SP12-15. Start with default setpoints. The number of STAGE ON setpoints used must be

the same as SP3.

See Figure 2, Field Wiring Diagram on page 11 for fan staging field wiring connection points.

OM Centrif Micro ΙΙ-5 31

Tower Fan Staging With Bypass Valve Controlling Minimum EWT (VALVE SP)

1) TOWER SETPOINT Screen a) SP1. Select TEMP if control is based on condenser EWT or LIFT if based on compressor

lift expressed in psi.

b) SP2. Select Valve SP for control of bypass valve based on temperature or lift. c) SP3. Select one to four fan outputs depending on the number of fan stages to be used.

More than one fan can be used per stage through the use of relays.

d) SP4. Select STAGE UP TIME from 1 to 60 minutes. The default value of 2 minutes is

probably a good starting point. The value may need to be adjusted later depending on actual system operation.

e) SP5. Select STAGE DOWN TIME from 1 to 60 minutes. The default value of 5 minutes

is probably a good starting point. The value may need to be adjusted later depending on actual system operation.

f) If TEMP is selected in SP1, use

i) SP6. Select STAGE DIFFERENTIAL in degrees F, start with default of 3 degrees F. ii) SP8-11. Set the STAGE ON temperatures consistent with the temperature range over

g) If LIFT is selected in SP1, use

i) SP7. Select STAGE DIFFERENTIAL in PSI. Start with default of 6 PSI.

ii) SP12-15. Start with default setpoints. The number of STAGE ON setpoints used

must be the same as SP3.

2) VALVE SETPOINT Screen a) SP1, Select NC or NO depending if valve is closed to tower with no control power or open

to tower with no control power.

b) If TEMP was selected for fan control above, use

i) SP2, Set the VALVE TARGET (setpoint), usually 5 degrees below the minimum fan

stage setpoint established in TOWER SP11. This keeps full flow through the tower until the last fan is staged off.

ii) SP4, Set VALVE DEADBAND, the default of 2 degrees F is a good place to start. iii) SP8, Set MINIMUM VALVE POSITION when EWT is at or below SP9. Default is

0%.

iv) SP9, Set the EWT at which the valve position will be at (SP8). Default is 60°F. v) SP8, Set MINIMUM VALVE POSITION when EWT is at or below SP9. Default is

0%.

vi) SP9, Set the EWT at which the valve position is set to allow the fans to stage up

(SP8). Default is 60°F.

vii) SP10, Set the initial valve position when EWT is at or above SP11. Default is 100%.

SP11, Set the EWT at which initial valve position is set to SP8. Default is 90°F.

viii) SP12, Set the minimum position to which the valve can go. Default is 10%. ix) SP13, Set the maximum position to which the valve can go. Default is 100%. x) SP14, Set the control gain for error. Default is 25. xi) SP15, Set the control gain for slope. Default is 25.

32 OM Centrif Micro ΙΙ-5

Max Start Position

NOTE: Setpoints 14 and 15 are site specific dealing with system fluid mass, component size and other factors affecting the reaction of the system to control inputs. These setpoints should be set by personnel experienced with setting up this type of control.

c) If LIFT was selected for fan control, use

i) SP3, Set the VALVE TARGET (setpoint), usually 30 psi below the minimum fan

stage setpoint established in TOWER SP12. This keeps full flow through the tower until the last fan is staged off.

ii) SP5, Set VALVE DEADBAND, the default of 6 psi is a good place to start. iii) SP8, Set MINIMUM VALVE POSITION when EWT is at or below SP9. Default is

0%.

iv) SP9, Set the EWT at which the valve position will be at (SP8). Default is 60°F. v) SP12, Set the minimum position to which the valve can go. Default is 10%. vi) SP13, Set the maximum position to which the valve can go. Default is 100%. vii) SP14, Set the control gain for error. Default is 25. viii) SP15, Set the control gain for slope. Default is 25.

Initial Valve Position

Max Position

@ Setpoint

(90°F)

Min Position

@ Setpoint

(60°F)

Min Start Position Set Point (10%)

Set Point (90%)

See Figure 2 on page 11 for fan staging and bypass valve field wiring connection points.

Tower Staging with Bypass Valve Controlled by Fan Stage (VALVE STAGE)

This mode is similar to #2 above except that the bypass valve setpoint changes to be set at the same point of whatever fan stage is active rather than just maintaining a single minimum condenser EWT. In this mode the valve controls between fan stages and tries to maintain the fan stage setting in effect. When it is max open or max closed (staging up or down) and the temperature (or lift) moves to the next fan stage, the valve will go the opposite max setting. This mode reduces fan cycling.

This mode is programmed the same as Mode #2 above except that in SETPOINT, TOWER, SP2, VALVE STAGE is selected instead of VALVE SP.

Fan VFD, No Bypass Valve (VFD STAGE)

The fan VFD mode assumes the tower is driven by one large fan. Set up is as above except in SETPOINT, TOWER, SP2, VALVE/VFD is selected.

OM Centrif Micro ΙΙ-5 33

MOTOR Setpoint Screen

Figure 19, MOTOR Setpoint Screen

Table 17, MOTOR Setpoint Settings

Description No. Default Range

Lift @ 100% Speed 15

Speed @ 0 Lift 14 50% 0 to 100% T Lift @ min speed as a % of 100 % lift

Minimum Speed 13 70% 60 to 100% T Min VFD speed, has priority over SPs 11 & 12

VFD 12 No No, Yes T VFD on unit or not Oil No Start Diff

(above Evap Temp) Nominal Capacity 10 0 to 9999 Tons Determines when to shut off a compressor

Maximum Rate 9

Minimum Rate 8

Soft Load Ramp 7 5 min 1 to 60 min M

Initial Soft Load Amp Limit

Soft Load Enable 5 OFF OFF, ON M Soft load on or off Nameplate RLA 4 Not used on W SC/WDC models Maximum Amps 3 100% 40 to 100% T % RLA above which loading is inhibited (Load Limit) Minimum Amps 2 40% 20 to 80% T % RLA below which unloading is inhibited

Demand Limit Enable 1 OFF OFF, ON O

40 °F 30 to 60 °F

0.5

°F/min

0.1

°F/min

6 40% 20 to 100% M Initial amps as % of RLA

0.1 to 5.0 °F/min

0.0 to 5.0 °F/min

Password

T Temp lift at 100 % speed (cond sat – evap sat temp)

Minimum Delta-T between oil sump temperature

and saturated evaporator temperature

Inhibits loading if LWT change exceed the setpoint

value. Additional compressor can start if LWT change is

below setpoint. Time period to go from initial load point (% RLA) set in SP 5 to 100% RLA

ON sets %RLA at 0% for 4 mA external signal and at 100% RLA for 20 mA signal

Comments

34 OM Centrif Micro ΙΙ-5

MODES Setpoints

Figure 20, MODES Setpoint Screen

Table 18, MODE Setpoint Settings

Description No. Default Range

Comp # 2 Stage Sequence

Comp # 2 Mode 13 Normal

Comp #1 Stage Sequence

Comp #1 Mode 11 Normal

Max. Comp. ON 10 1 1-16 M Total number of compressors minus standby

BAS Protocol 9 Modbus

Hot Gas Control Point Hot Gas Bypass Mode

Cond Pump 6

Evap Pump 5

Available Modes 4 COOL

Control Source 3 LOCAL LOCAL, BAS, SWITCH O Sets control source Unit Mode 2 COOL COOL, ICE, HEAT, TEST Selects from MODES in SP4

Unit Enable 1 OFF OFF, ON O

14 1 1,2, … (# of Compressors) M

Normal, Efficiency, Pump,

12 1 1,2, … (# of Compressors) M

Normal, Efficiency, Pump,

8 30% 20 to 70% T LWT or % RLA below which HGBP solenoid is on

7 Normal Off, Water LWT, %RLA T Sets mode for hot gas operaton

Pump

#1 Only

Pump

#1 Only

Only, Auto Lead, #1 Primary,

Standby

None, Local, Remote,

BACnet, LonWorks,

MODBUS,

Pump #1 Only, Pump #2

#2 Primary

Pump #1 Only, Pump #2

#2 Primary

COOL, COOL/ICE, ICE,

COOL/HEAT, HEAT

Pass-

word

Sets sequence number for # 2 compressor, if 1 it is always first to start, if 2 is always second (Note 1) Normal uses standard sequencing Efficiency starts one compressor on each dual unit

Pump starts all compressors on one chiller first Standby uses this compressor only if another fails. Sets sequence number for # 1 compressor, if 1 it is always first to start, if 2 is always second (Note 1)

M Ditto No. 12.

Sets BAS Standard Protocol to be used or LOCAL

if none.

Pump #1 Only, Pump #2 Only, use only these pumps

AUTO, balance hours between #1 and #2 #1 Primary, #2 Primary, if primary fails, use other Pump #1 Only, Pump #2 Only, use only these pumps

AUTO, balance hours between #1 and #2 #1 Primary, #2 Primary, if primary fails, use other

T Sets modes that can be selected in SP 2

OFF, everything is off. ON, Evap pump on, comp, cond pump and tower on as required to meet LWT

Comments

OM Centrif Micro ΙΙ-5 35

WATER Setpoints

Figure 21, WATER Setpoint Screen

Table 19, WATER Setpoint Settings

Description N0. Default Range

Templifier Source Water Reset (Delta-T) Templifier Source No Start

Max Reset Delta T

Start Reset Delta T

LWT Reset Type 7 NONE

Stage Delta T 6 1

Startup Delta T 5

Shutdown Delta T 4

Heat LWT 1

Ice LWT 2

Cool LWT 3

55°F 50 to 100 °F

70°F 50 to 100°F

0.0°F 0.0 to 20.0 °F

10. 0°F 0.0 to 20.0 °F

NONE, RETURN,

3.0°F 0.0 to 10.0 °F

3.0°F 0.0 to 3.0 °F

135. 0°F 100.0 to 150.0 °F

25. 0°F 15.0 to 35.0 °F

44. 0°F 35.0 to 80.0 °F

4-20mA

0.5 to 5°F

Pass word

Resets the condenser leaving temperature

downward if source leaving drops under the delta-T. Setting is a function of comp selection. Entering source water temperature below which

the unit cannot start. Set the maximum reset that can occur, in

degrees F if LWT reset is selected or max reset at 20 mA input if 4-20 mA is selected in SP7 Sets the evap delta-T above which Return reset

begins. Select reset type, NONE for none, RETURN for

reseting chilled water based on the entering water, or 4-20 mA for external analog signal Sets the temperature the leaving water must be

below setpoint for next compressor to start. M Degrees above setpoint for compressor to start.

M Degrees below setpoint for compressor to stop.

Condenser LWT setpoint in HEAT (Templifier) M

mode M Evaporator LWT setpoint in the ICE mode

M Evaporator LWT setpoint in COOL mode

Comments

36 OM Centrif Micro ΙΙ-5

SERVICE Screen

Figure 22, Service Screen

Pressing SET from any SET screen accesses the SERVICE screen. In other words, it is the second "SET" screen. While containing information and activity buttons for the service technician, it also has valuable information for the operator.

The upper left corner contains compressor information as shown above. The screen illustrated is for a dual compressor unit, a single, of course, would show data for only one compressor. "Spare Capacity" is used to set the compressor stopping increment for dual compressors.

The light matrix below it displays what nodes are active for chillers A, B, C, and D on the pLAN.

The software version numbers shown in the lower left corner are the controllers' software identification. These numbers may be required by McQuay to answer questions about unit operation or to assist in possible future upgrades of software. The OITS software number is shown in the upper-right corner.

The Operating Manual button will access the operating and maintenance manual for the unit. The unit will also have a Parts Manual button. Some early versions may not have a parts list loaded. A McQuay service technician can upload it. Pressing these buttons will display the manual on the screen where it can be manipulated as an Adobe Acrobat file.

SELECT LANGUAGE allows toggling between the available languages. The language can be set separately for display or history, which is used for alarm and trend files.

The PASSWORD button is used to access the Keyboard screen to enter a password.

The Alarms ON/OFF button is normally used only on demonstration software and will probably not appear on the unit’s screen. If so, they should be ignored.

The LOAD UCM and pLAN Comm buttons are for use only by authorized service technicians.

Date/Time in the upper-right corner is pressed to set the correct date and time, if needed.

OM Centrif Micro ΙΙ-5 37

HISTORY Screens

Figure 23, History Trend Graph

The Trend History Overview allows the user to view the various parameters listed on the right side of the screen. The temperature scale in °F (°C) is on the left. Pressure in psi (kPa) and % RLA are represented by the right-hand scale. The screen can display history for 8 hour, 2 hour or 20-minute periods by pressing 8, 2, or 1/3 respectively. Some software versions have a 24 hour instead of an 8 hour period.

Pressing NOW for any time period will start the display for the current time beginning on the right of the screen with history flowing to the left.

The arrow buttons scroll the time period forward or backward. Obviously if NOW is selected, the forward button > will not go into the future.

38 OM Centrif Micro ΙΙ-5

Figure 24, Alarm History/USB Download

The Alarm History lists the alarms with the most current on top with date stamp, action taken and the cause of the alarm. The alarms are color-coded as shown on the top of the screen.

Download from the USB

This screen is also used to download the Trend History (Figure 23) selected by date or the Alarm History shown above. To download, connect a USB portable storage device to the USB port located in the unit control panel adjacent to theOITS, and:

• For Alarms, press the ALARMS button on the screen, then press the COPY to USB button.

• For Trend History, select the desired History File by date using the PREV or NEXT buttons, then press

the COPY to USB button.

OM Centrif Micro ΙΙ-5 39

ACTIVE ALARM Screen

Figure 25, Active Alarms

The Active Alarm screen is accessible when an active alarm exists on the unit by pressing the red alarm signal on any screen. If no alarm is active, it can be accessed from the SERVICE screen by pressing the blue square where the red alarm signal would be. This allows repeating the alarm clear command if desired.

Alarms are arranged in order of occurrence, with the most recent on top. Once the abnormal condition is corrected, pressing the "CLEAR" key will clear the alarm.

The current active alarms (there may be more than one) are displayed. Note that the alarms are color-coded red for FAULT (equipment protection control) that causes a rapid compressor shutdown, yellow for PROBLEM (limit alarm) that will inhibit loading, or load or unload the compressor, and blue for WARNING which is information only and takes no action.

The date/time and cause of the alarm are displayed.

After eliminating the cause of the alarm, clear the alarm by pressing the CLEAR button. This will clear the alarm from the register and allow the unit to restart after going through the start sequence. The alarm notice will be deleted from the screen.

However, if the cause of the alarm is not remedied, the alarm is still active and the alarm message will remain on screen. The unit will not begin its starting sequence.

Always remedy the cause of an alarm before attempted to clear it.

40 OM Centrif Micro ΙΙ-5

Alarms fall into three distinct categories: Faults, Problems, and Warnings as detailed in the following section.

Fault Alarms

The following table identifies each fault alarm, its display, gives the condition that causes the alarm to occur, and states the action taken because of the alarm. All fault alarms require a manual reset and trigger the remote alarm signal.

Table 20, Fault Alarm Description

Description Display Occurs When: Action Taken

Low Evaporator Pressure Evap Pressure Low Evaporator Press < Low Evap Pressure SP Rapid Stop High Condenser Pressure Condenser Press High Cond Press > High Condenser Pressure SP Rapid Stop

Vanes Open No Start Vanes Open

Low Oil Delta Pressure Oil Delta Pressure Low

Low Oil Feed Temperature Oil Feed Temp Low

High Oil Feed Temperature Oil Feed Temp High Temp > High Oil Feed Temperature SP Rapid Stop

Low Motor Current Motor Current Low

High Discharge Temperature Disch Temp High Temp > High Discharge Temperature SP Rapid Stop Mechanical High Pressure Mechanical High Press Digital Input = High Pressure Rapid Stop High Motor Temperature High Motor Temp Digital Input = High Temperature Rapid Stop Surge Temp High Surge Temp > Surge Temp SP Rapid Stop Surge Temp Slope High

Compressor Surge Eminent

No Starter Transition No Starter Transition

No Compressor Stop

Starter Fault Starter Fault

Low Oil Pressure Start Oil Pressure Low-Start Compressor State = START for 30 sec Rapid Stop

No Evaporator Water Flow

No Condenser Water Flow

Leaving Evaporator Water Temperature Sensor Fault Evaporator Pressure Sensor Fault Condenser Pressure Sensor Fault Suction Temperature Sensor Fault Discharge Temperature Sensor Fault Oil Feed Temperature Sensor Fault Oil Sump Temperature Sensor Fault Oil Feed Pressure Sensor Fault Oil Sump Pressure Sensor Fault

Surge Temperature

Note 1

Surge Switch

Note 2

Current High with

Comp Off

Evaporator Water Flow

Loss

Condenser Water Flow

Loss

Evap LWT Sensor Out

of Range

Evap Pressure Sensor

Out of Range

Cond Pressure Sensor

Out of Range

Suction Pressure

Sensor Out of Range

Discharge Temp Sensor

Out of Range

Oil Feed Temp Sensor

Out of Range

Oil Sump Temp Sensor

Out of Range

Oil Feed Pressure

Sensor Out of Range

Oil Sump Pressure

Sensor Out of Range

NOTES:

Surge Temperature is defined as the suction temperature minus the leaving chilled water temperature.

Delta-P switch used only on chillers manufactured in Europe.

Starter alarm faults will be sent from the starter and will also appear here. They are discussed elsewhere in this manual.

Compressor state = PRELUBE for 30 sec

after Prelube timer expires

(Comp State=PRELUBE, RUN, UNLOAD, or

POSTLUBE)

& Net Oil Press < Low Net Oil Press SP

(Comp State=RUN or UNLOAD) &

Oil Feed temp <

(Evap Saturated Refr Temp + Low Oil Delta

Temperature SP) for > 1 min

I < Motor Current Threshold with Compressor

ON for 30 sec

Surge Temp Slope > Surge High Slope SP Rapid Stop

Delta-P Switch Senses Reverse Pressure

Across the Discharge Check Valve

Starter Transition Digital Input = No Transition

AND Compressor ON for > 15 seconds

%RLA > Motor Current Threshold SP with

Compressor OFF for 30 sec

Starter Fault Digital Input = Fault AND

Compressor State = START, PRELUBE,

RUN, or UNLOAD

Chilled Water Flow Switch Open Rapid Stop

Condenser Water Flow Switch Open Rapid Stop

Sensor shorted or open Rapid Stop

Rapid Stop

Annunciation

Rapid Stop

OM Centrif Micro ΙΙ-5 41

Problem Alarms

The following alarms do not cause compressor shutdown but limit operation of the chiller in some way as described in the Action Taken column. A limit alarm will trigger the red alarm screen but not the digital output for the optional remote alarm.

Table 21, Problem Alarm Description

Description Display Occurs When: Action Taken Reset

Low Evaporator Pressure – Inhibit Loading Low Evaporator Pressure – Unload

Evaporator Freeze Protect

Condenser Freeze Protect

High Discharge Temperature

Lo Evap Press-

NoLoad

Low Evap

Press-Unload

Evap Pres Lo-

Freeze

Cond Pres Lo-

Freeze

High Discharge

T-Load

Pressure < Low Evap

Pressure–Inhibit setpoint

Pressure < Low Evap

Pressure–Unload setpoint

Evap Sat Refr Temp < Evaporator Freeze SP

Cond Sat Refr Temp <

Condenser Freeze SP

Temperature > High Discharge

Temperature-Load SP AND

Suction superheat < 15°F

Inhibit loading

Unload

Start

evaporator

pump

Start condenser

pump

Load

Evap Press rises

above (SP + 3psi)

Evap Press rises

above (SP + 3psi)

Temp > (Evaporator

Freeze SP + 2°F)

Temp > (Condenser

Freeze SP + 2°F)

Temp < (High Dsch Temp Load SP – 3°F) OR Superheat > 18°F

Warning Alarms

A warning is annunciated whenever an abnormal condition exists which does not affect chiller operation and does not trigger the remote alarm.

Table 22, Warning Alarm Description

WARNING DISPLAY CONDITION

Liquid Line Refrigerant

Temperature Sensor Fall Warning

Entering Evaporator Water

Temperature Sensor Fall Warning

Leaving Condenser Water

Temperature Sensor Fail Warning

Entering Condenser Water

Temperature Sensor Fail Warning

Liq Line T Sen Warn Sensor is shorted or open

Ent Evap T Sen Warn Sensor is shorted or open

Lvg Cond T Sen Sensor is shorted or open

Ent Cond T Sen Sensor is shorted or open

Figure 26, Keyboard

The keyboard is for entering the password when attempting to enter or change a setpoint. This screen is accessed from the SERVICE screen by pressing the PASSWORD button. It is automatically accessed when making a change to a setpoint on any SET screen.

42 OM Centrif Micro ΙΙ-5

ALARM

Unit Controller

A general description of the unit controller with its inputs and outputs is on page 7. This section will describe the operation of the unit controller, define the screen hierarchy and how to navigate through it and also give a description of the screens.

4x20 Display & Keypad

Layout

The 4-line by 20-character/line liquid crystal display and 6-key keypad are shown below.

Figure 27, Display (in MENU mode) and Keypad Layout

Air Condit ioning

Key-to-Screen Pathway

VIEW

< <

MENU Key

SET

ARROW Keys

ENTER Key

Note that each ARROW key has a pathway to a line in the display. Pressing an ARROW key will activate the associated line when in the MENU mode.

Getting Started

There are two basic procedures to learn in order to utilize the MicroTech II controller:

1. Navigating through the menu matrix to reach a desired menu screen and knowing where a

particular screen is located.

2. Knowing what is contained in a menu screen and how to read that information or how to

change a setpoint contained in the menu screen.

Navigating

The menus are arranged in a matrix of screens across a top horizontal row. Some of these toplevel screens have sub-screens located under them. The general content of each screen and its location in the matrix begins in Figure 29 on page 44. A detailed description of each menu screen begins on page 46.

There are two ways to navigate through the menu matrix to reach a desired menu screen.

1) One is to scroll through the matrix from one screen to another using the four ARROW keys.

2) Another way is to use shortcuts to work through the matrix hierarchy. From any menu screen,

a) Pressing the MENU key will take you to the top level of the hierarchy. The display will

show ALARM, VIEW, and SET. One of these groups of screens can then be selected by pressing the key connected to it via the pathway.

OM Centrif Micro ΙΙ-5 43

WATER °F (1).

. In Out Delta

Evap

REFRG (1) .

. °psi F

Sat Evap

Stages ON= of

EntCondTemp=

VIEW COMP #1

State =

% RLA = %.

VIEW COMP #2

State =

% RLA = %.

EVAPORATOR

Suct SH =

Approach =

CONDENSER

Disch SH =

Approach =

WATER °F . (2)

Suct Line =

Liquid Line =

Bypass Valve =

VFD Speed =

Cond Press =

Evap Press =

VIEW COMP #2

Cond Press =

Evap Press =

VIEW COMP

Feed Press =

Sump Press =

Net Press =

VIEW COMP #2

Vent Press =

Feed Press =

Press =

VIEW COMP

Sump Temp =

Lift Temp

VIEW COMP #2

Sump Temp =

ALARM LOG (1)

Description

.Time Date

ALARM

.Time Date

Description….

VIEW COMP

Temp SH

VIEW COMP #2

Temp SH

ALARM LOG (2)

Description

Time Date

VIEW COMP

Sat Evap

Sat Cond

VIEW COMP #2

Sat Evap

ALARM LOG (N)

Description

Time Date

VIEW COMP

Hours =

Starts =

VIEW COMP #2

Hours =

Starts =

b) Depending on the top-level selected, a second level of screens will appear. For example,

selecting ALARM will go the next level of menus under ALARM (ALARM LOG or ACTIVE ALARM). Selecting VIEW will go the next level of menus (VIEW COMPRESSOR STATUS, VIEW UNIT STATUS, VIEW EVAPORATOR, or VIEW CONDENSER). Selecting SET will go to a series of menus for looking at and changing setpoints.

c) After selecting this second level, the desired screen can be acquired using the arrow keys.

A typical final screen is shown below.

Pressing the MENU key from any menu screen will automatically return you to the MENU mode.

Figure 28, Typical Menu Display and Keypad Layout

Air Condit ioning

MENU Key

VIEW UNIT STATUS Unit = COOL Compr. #1/#2=OFF/OFF Evap Pump = RUN

ARROW Keys

ENTER Key

Screen Content

Figure 29, View Screens

VIEW UNIT STATUS (1) Unit = COOL Compressor 1=X Ev/Cn Pmps= / VIEW UNIT STATUS (2) Compressor 2=X Start-Start Tmr= Inhibit Oil Temp

VIEW UNIT

Alarm Screens

VIEW UNIT

Cond VIEW UNIT

. In Out Delta HtRc Cond XX XX XX

WATER . (3) Water Flo Rates Evap = XXX Cond = XXX

ACTIVE

Fault

Sat Cond VIEW UNIT REFRG (2)

Lift Press =

VIEW UNIT

VIEW UNIT TOWER(1)

Setpoint= VIEW UNIT TOWER(2)

(1)

Evap LWT = °F VIEW COMP (2)

Lift Press =

(3)

(4)

Feed Temp =

(5) .

Suction °F °F Dischrg °F °F

(6) . . Psi °F

(7)

(1)

Evap LWT = °F

(2)

Lift Press =

(3)

Net

(4)

Feed Temp = Lift Temp

(5) .

Suction °F °F Dischrg °F °F

(6) . Psi °F

Sat Cond

(7)

VIEW

Subcooling=

44 OM Centrif Micro ΙΙ-5

SPs (1)

Demand Limit=

Minimum Amps = %

SET COMP#2 SPs (1)

Demand Limit=

Minimum Amps= %

Available Modes

Select w/Unit Off

SET COMP SPs (2)

eMode =

StageSequence# =

SET COMP#2 SPs (2)

StageMode =

StageSequence# =

Cool LWT =

Ice LWT =

Ps (3)

StartDelta =

SET COMP SPs (4)

Full Load = sec

SET COMP#2 SPs (4)

Full Load = sec

Rest Type =

Max Reset DT =

OilNoStrtDiff=

Soft Load =

BeginAmpLimit =

Unload Timer = sec

Max/Min LWT Rates

Max = /min

SET COMP SPs (7)

VaneMode =

SET COMP#2 SPs (7)

VaneMode =

EvapRecTmr = min

SET COMP SPs (8)

VFD Mode =

SET COMP#2 SPs (8)

VFD Mode =

VFD = %

SET UNIT SPs (10)

VFD =

SET UNIT SPs (13)

F/psi (IP)

Set Screens

SET UNIT SPs (1) Enable = Mode = Source = SET UNIT SPs (2)

SET UNIT SPs (3)

Heat LWT = SET UNIT SPs (4) Leaving Water Temp.

StopDelta = SET UNIT SPs (5)

Strt Reset DT = SET UNIT SPs (6)

SoftLoadRamp = SET UNIT SPs (7)

Min = /min SET UNIT SPs (8)

EvapPump = CondPump =

SET UNIT SPs (9) Templifier Src Water No start = 70°F Delta Reset=055°F

Min Speed = % Spd/Lift = %/

SET UNIT SPs (11) Max Water Flow Rates Evap WF = XXXXX GPM Cond WF = XXXXX GPM

SET UNIT SPs (12 Standard Time 17/March/2005 12:20 THU

Display Format Units = Lang = English SET UNIT SPs (14) Protocol = MODBUS Id #=001 Units=IP Baud Rate=19200 SET UNIT SPs (15) Ex-Valve Gain = 100 Offset(Slope) = 271 Pr Ctrl Dout = 10°F

SET COMP #1

Maximum Amps= %

Stag

Max Compr ON = SET COMP SPs (3)

StageDeltaT = Stop-Srart = min Start-Start = min

SET COMP SPs (5) OilNoStrtDiff= Abs Capacity = T HotGasBypass = % SET COMP SPs (6)

PreLubeTmrs= sec PostLub Tmrs= sec

Vanes = %RLA= %

VFD = % %RLA = %

SET COMP SPs (9) Protocol = MODBUS Id #=001 Units=IP Baud Rate=19200

SET COMP SPs (10) Refrig Sat Pressure Evap Offset = 00.0 psi Cond Ofset = 00.0 psi

SET COMP SPs (11) ELWT Offset = 0.0°F Oil Sump OS = 00.0 psi Oil Feed OS = 00.0 psi

Maximum Amps= %

Max Compr ON = SET COMP#2 S

StageDeltaT = Stop-Srart = min Start-Start = min

SET COMP#2 SPs (5)

Abs Capacity = T HotGasBypass = % SET COMP#2 SPs (6) Unload Timer = sec PreLubeTmrs= sec PostLub Tmrs= sec

Vanes = %RLA= %

%RLA = %

SET COMP SPs (9) Protocol = MODBUS Id #=001 Units=IP Baud Rate=19200

SET COMP SPs (10) Refrig Sat Pressure Evap Offset = 00.0 psi Cond Ofset = 00.0 psi

SET COMP SPs (11) ELWT Offset = 0.0°F Oil Sump OS = 00.0 psi Oil Feed OS = 00.0 psi

SET ALARM SPs (1) LowEv PrHold = Low Ev Pr Unld = Low Ev Pr Stop = SET ALARM SPs (2) High Cond Pr = HiDiscT-Load = HiDiscT-Stop =

SET ALARM SPs (3) High HiOilFeedTemp = LowOilDeltaT = LowNetOilPr = SET ALARM SPs (4) Surge Slp Str = XX°F Surge Temp Run=XX°F MtrCurrThrshld = SET ALARM SPs (5)

EvapFreeze = CondFreeze =

SET TOW ER SPs (1) TowerControl-Temp = TowerStages = StageUp/Dn = xxx/xxx SET TOW ER SPs (2) StageOn(Temp) °F #1 #2 #3 #4 xxx xxx xxx xxx SET TOW ER SPs (3) StageDiff = StageUp = StageDown = SET TOW ER SPs (4) Valve/VFDControl = ValveSp/VFDStage ValveType =

SET TOW ER SPs (5) Valve SP = Valve DB =

SET TOW ER SPs (6) Valve Start Position Min = xxx%@xxx°F Max = xxx%@xxx°F SET TOW ER SPs (7) Valve Control Range Min = % Max = % SET TOW ER SPs (8) PD Control Loop Error Gain = % Slope Gain = %

OM Centrif Micro ΙΙ-5 45

Inhibit Oil Temp Low

F(1)

F(2)

Screen Descriptions

VIEW Screens

VIEW Screens are only for viewing the operation of the unit and compressors. No data is input into VIEW Screens. The controllers’ screens are only in °F/psi. When the Display Units set point is set to °C/kPa, the units of measure on the OITS only will change.

View Unit Status (Single Compressor)

VIEW UNIT STATUS (1) Unit=COOL Compressor=LOAD Ev/Cn Pmps=STRT/RUN

VIEW UNIT STATUS (2) Compressor=LOAD Start-Start Tmr Clr

Unit status can be OFF, COOL, ICE, HEAT, and ALARM as determined from the Unit State variable, the Unit Mode setpoint, the Unit Enable and the presence of a shutdown alarm. Compressor states can be OFF, START, PRELUBE, HOLD, LOAD, UNLOAD, POSTLUBE, and ALARM as determined from the Comp State variable and the Load and Unload outputs, and the presence of a compressor shutdown alarm. Evap and Cond Pump states can be OFF, STRT (start), & RUN.

View Unit Status (Dual Compressor)

VIEW UNIT STATUS (3) Unit=COOL Cmp1/2= LOAD /POSTLB Ev/Cn Pmps=STRT/RUN

This screen is only viewable on dual compressor units. Unit states can be OFF, COOL, ICE, HEAT, and ALARM as determined from the Unit State variable, the Unit Mode setpoint, and the presence of a unit shutdown alarm. Compressor states can be OFF, START, PRELB, HOLD, LOAD, UNLOAD, POSTLB, and ALARM as determined from the Comp State variable, the Load and Unload outputs, and the presence of a compressor shutdown alarm. Evap and Cond Pump states can be OFF, STRT (start), & RUN.

View Unit Water

VIEW UNIT WATER °°°° In Out Delta Evap XX.X XX.X XX.X Cond XX.X XX.X XX.X

VIEW UNIT WATER °°°° In Out Delta HtRc NA NA Cond XX.X XX.X XX.X

HT RC will only show temperatures if the unit has a heat recovery bundle with sensors, otherwise it will show NA. Cond is the tower condenser, which will always be present.

46 OM Centrif Micro ΙΙ-5

F(3)

VIEW UNIT WATER °°°° Water Flow Rates Evap = XXXX GPM Cond = XXXX GPM

View Unit Refrigerant

VIEW UNIT REFRG (1) psi °°°°F

Sat Evap XXX.X XX.X Sat Cond XXX.X XX.X

VIEW UNIT REFRG (2) Suct Line = XXX.X°°°°F Liquid Line= XXX.X°°°°F

Lift Press =XXX.Xpsi

View Unit Tower

Tow er Co nt r o l = Temp / N o ne To we r C on tr o l = L if t

VIEW UNIT TOWER (1) VIEW UNIT TOWER (1) Stages ON = 2 of 4 Stages ON = 2 of 4

Setpoint = XXX °°°°F

The first Stages ON value is the number of fan stages ON. The second number is the Tower Stages set point, i.e. the number of stages set, selectable from 0 to 4 (0 if Tower Control = None). The bottom line is the setpoint, °F or psi will show on the screen depending on whether TEMP (°F) or LIFT (psi) is selected in the Cooling Tower Control setpoint.

Setpoint = XXXX psi

VIEW UNIT TOWER (2) Bypass Valve = XXX% VFD Speed = XXX%

The Bypass Valve value is “None” (in place of XXX%) if the Valve/VFD Control set point = None or VFD Stage. The VFD Speed value is “None” if the Valve/VFD Control set point = None, Valve Setpoint, or Valve Stage.

View Compressor

NOTE: In the following VIEW COMP screens, the #N field indicates which compressor (#1, and #2 for dual compressor units.) is being viewed.

VIEW COMP#N (1) State = RUN % RLA = XXX %

Evap LWT = °°°°F

State settings can be OFF, START, PRELUBE, HOLD, LOAD, UNLOAD, SHUTDOWN, POSTLUBE, and ALARM as determined from the Comp State variable, the Load and Unload outputs, and the presence of a compressor shutdown alarm. #N is for compressor #1 or #2 on dual compressor units and does not appear on single compressor units.

OM Centrif Micro ΙΙ-5 47

VIEW COMP#N (2) Cond Press = Evap Press = Lift Press =

VIEW COMP#N (3) Feed Press =XXXX psi Sump Press =XXXX psi Net Press = XXX psi

VIEW COMP#N (4) Sump Temp = XXX.X°°°°F Feed Temp = XXX.X°°°°F Lift Temp = XXX.X°°°°F

Lift Temp is the difference in suction and discharge saturated temperatures.

VIEW COMP#N (5) Temp SH

Suction xxx°°°°F xx°°°°F Discharge xxx°°°°F xx°°°°

VIEW COMP#N (6) Psi °°°°F

Sat Evap=XXX.X XXX.X Sat Cond=XXX.X XXX.X

VIEW COMP#N (7) Hours = XXXX x 10 Starts =XXXX

Vi ew Ev ap ora to r

VIEW EVAPORATOR Suct SH = XXX.X °°°°F Approach = XX.X °°°°F

View Condenser

VIEW CONDENSER Disch SH = XXX.X °°°°F Approach = XX.X °°°°F Subcooling= XX.X °°°°F

48 OM Centrif Micro ΙΙ-5

View ALARM Screens

View Alarm Log

ALARM LOG (1) Alarm Description

hh:mm:ss dd/mmm/yyyy

ALARM LOG (2-25) Alarm Description

hh:mm:ss dd/mmm/yyyy

The ALARM LOG contains a description and time stamp on the last 25 alarms

Active Alarm Screen

Active Alarms

ALARM ACTIVE (1) Alarm Description hh:mm:ss dd/mmm/yyyy <Press Edit to CLEAR

The alarm screen is viewable only when there is one or more uncleared alarms active. See page 97 for instructions on clearing alarms.

SET Screens

The PW (password) column indicates the password that must be active in order to change the set point. Codes are as follows:

O = Operator, password is 100 M = Manager, password is 2001 T = Technician (reserved)

The operator password is entered as 100 (three digits) on the OITS graphic keyboard. When entered on a microprocessor LCD screen, four digits are required, thus it is entered as 0100.

Editing Setpoints

In order to enter or change a setpoint, the appropriate screen must first be accessed. There are two ways to get to the desired menu screen:

1. Scrolling, The scroll method allows the user to move about the matrix (from one menu to

another, one at a time) by using the four ARROW keys. The menu matrix begins in Figure 29 on page 44.

2. The MENU key can be used as a shortcut to specific groups of menus within the matrix.

Pressing the MENU key from any menu screen will automatically return you to the MENU mode.

Editing is accomplished by pressing the ENTER key until the desired field is selected. This field is indicated by a blinking cursor under it. The arrow keys will then operate as defined below.

Right Arrow Key = CANCEL Reset the current field to the value it had when editing began.

Left Arrow Fey = DEFAULT Set value to original factory setting.

Up Key = INCREMENT Increase the value or select the next item in a list.

Down Key = DECREMENT Decrease the value or select the previous item in a list.

OM Centrif Micro ΙΙ-5 49

ALARM

INCREMRNT

MENU CANCEL DEFAULT

Air Condit ioning

VIEW

< <

SET

DECREMENT

ENTER

These four edit functions are indicated by one-character abbreviation on the right side of the display (this mode is entered by pressing the ENTER key).

Most menus containing set point values have several different setpoints shown on one menu. When in a setpoint menu, the ENTER key is used to proceed from the top line to the second line and on downward. The cursor will blink at the entry point for making a change. The ARROW keys (now in the edit mode) are used to change the set point as described above. When the change has been made, press the ENTER key to enter it. Nothing is changed until the ENTER key is pressed.

For example, to change the chilled water setpoint:

1. Press MENU key to go to the MENU mode.

2. Press SET (the UP Key) to go to the setpoint menus.

3. Press UNIT SPs (the Right key) to go to setpoints associated with unit operation.

4. Press the DOWN key to scroll down through the setpoint menus to the third menu screen

which contains Cool LWT=XX.X°F.

5. Press the ENTER key to move the cursor down from the top line to the second line in order to

make the change. If a password is not active, the control will automatically go to the Set PASSWORD screen

6. Use the ARROW keys (now in the edit mode as shown above) to change the setting.

7. When the desired value is achieved, press ENTER to enter it and also move the cursor down.

At this point, the following actions can be taken:

1. Change another setpoint in this menu by scrolling to it with the ENTER key.

2. Using the ENTER key, scroll to the first line in the menu. From there the ARROW keys can

be used to scroll to different menus.

During edit mode, the display will show a two-character wide menu pane on the right as shown below. They stand for; Default, Cancel, (+) Increase, (-) Decrease

SET UNIT SPs (X) <D (data) <C (data) <+ (data) <-

50 OM Centrif Micro ΙΙ-5

Additional fields can be edited by pressing the ENTER key until the desired field is selected. When the last field is selected, pressing the ENTER key switches the display out of “edit” mode and returns the arrow keys to “scroll” mode.

Unit Controller Setpoints

Table 23, Unit Setpoints

Description Default Range PW

Unit

Unit Enable OFF OFF, ON O WCC Off Off OFF, ON O

Unit Mode COOL COOL, ICE, HEAT, TEST

Available Modes COOL COOL, COOL/ICE, ICE, COOL/HEAT, HEAT T Mode Source Local LOCAL, BAS, SWITCH O Display Units Language ENGLISH ENGLISH, (TBD) O

BAS Protocol NONE

Hot Gas Mode OFF OFF, %RLA, LWT M Hot Gas Control Point 30% 20 to 70% M

Leaving Water

Cool LWT Ice LWT Heat LWT Startup Delta T Shutdown Delta T LWT Reset Type NONE NONE, RETURN, 4-20mA M Max Reset Delta T Start Reset Delta T

Electronic Expansion Valve

Ex Valve Gain 100 50 to 400 M Offset (Slpoe) 271 100 to 999 M Prs Ctrl DOut

Templifier

Source Water Reset

Timers

Evap Recirculate 30 sec 0.2 to 5 min M

Pumps

Evap Pump

Cond Pump

Cooling Tower

Tower Control None None, Temperature, Lift M Tower Stages 2 1 to 4 M Stage Up Time 2 min 1 to 60 min M Stage Down Time 5 min 1 to 60 min M Stage Differential (Temp) Stage Differential (Lift) 6.0 psi 1.0 to 20.0 psi M Stage #1 On (Temp) Stage #2 On (Temp) Stage #3 On (Temp) Stage #4 On (Temp) Stage #1 On (Lift) 35 psi 10 to 130 psi M Stage #2 On (Lift) 45 psi 10 to 130 psi M Stage #3 On (Lift) 55 psi 10 to 130 psi M Stage #4 On (Lift) 65 psi 10 to 130 psi M

Cooling TowerValve / VFD

Valve/VFD Control None

Valve Setpoint (Temp) Valve Setpoint (Lift) 30 psi 10 to 130 psi M Valve Deadband (Temp) Valve Deadband (Lift) 4.0 psi 0.1 to 20.0 psi (Note 2) M

°F/psi °F/psi

LOCAL, REMOTE, BACnet MSTP, BACnet

ETHERNET, BACnet TCP/IP, MODBUS

44. 0°F 35.0 to 80.0 °F

25. 0°F 15.0 to 35.0 °F

135. 0°F 100.0 to 150.0 °F

3.0°F 0.0 to 10.0 °F

3.0°F 0.0 to 3.0 °F

0.0°F 0.0 to 20.0 °F

10. 0°F 0.0 to 20.0 °F

10°F 0 to 99.9°F

80 °F 50 to 100 °F

Pump #1

Only

Pump #1

Only

3.0 °F 1.0 to 10.0 °F

70 °F 40 to 120 °F 75 °F 40 to 120 °F 80 °F 40 to 120 °F 85 °F 40 to 120 °F

65 °F 40 to 120 °F

2.0 °F 0.1 to 10.0 °F (Note 1)

Pump #1 Only, Pump #2 Only, Auto Lead, #1

Primary, #2 Primary

Pump #1 Only, Pump #2 Only, Auto Lead, #1

Primary, #2 Primary

None, Valve Setpoint, Valve Stage, VFD

Stage, Valve SP/VFD Stage

Note 1: Through Version C, minimum range value was 1.0°F. Note 2: Through Version C, minimum range value was 1.0 psi.

O O O O O

M M

M M M M

OM Centrif Micro ΙΙ-5 51

Select with unit off

Description Default Range PW

Stage Down @ 20% 0 to 100% M Stage Up @ 80% 0 to 100% M Valve Control Range (Min) 10% 0 to 100% M Valve Control Range(Max) 90% 0 to 100% M Valve Type NC To Tower NC, NO M

Minimum Start Position 0% 0 to 100% M Minimum Position @ Maximum Start Position 100% 0 to 100% M Maximum Position @ Error Gain 25 10 to 99 M Slope Gain 25 10 to 99 M

60 °F 0 to 100 °F

90 °F 0 to 100 °F

Set Unit Setpoints

SET UNIT SPs (1) Enable=OFF WCC=OFF Mode = COOL Source = Local

Enable settings can be OFF and ON as determined from the Enable set point. Unit Mode settings can be COOL, COOL w/Glycol, ICE, HEAT, or TEST as determined from the Unit Mode setpoint (TEST mode shall not be selectable from the 4x20 display/keypad although it may be displayed if already set). WCC units have the WCC enable set to ON at the factory.

Source settings can be LOCAL, SWITCHES, or NETWORK as determined from the Mode Source setpoint.

SET UNIT SPs (2) Available Modes = COOL/HEAT

Available Modes settings can be COOL, COOL/Glycol, COOL ICE w/Glycol., COOL/HEAT, HEAT or TEST, as determined from the Available Modes setpoint. This setpoint requires the unit to be turned off before changing.

SET UNIT SPs (3) Cool LWT = XX.X°°°°F Ice LWT = XX.X°°°°F Heat LWT = XXX.X°°°°F

The Cool, Ice, and Heat setpoints are only displayed if the corresponding mode is available as specified by the Available Modes setpoint.

SET UNIT SPs (4) Leaving Water Temp.

StartDelta= XX.X°°°°F StopDelta = X.X°°°°F

StartDelta is the number of degrees above setpoint (below setpoint for Templifiers) for unit to start. StopDelta is the number of degrees below setpoint (above setpoint for Templifiers) for unit to stop.

52 OM Centrif Micro ΙΙ-5

SET UNIT SPs (5) Reset Type =4-20mA

MaxResetDT =XX.X°°°°F StrtResetDT=XX.X°°°°F

Reset Type settings can be NONE, RETURN (return chilled water), or 4-20 (external input) as determined by the LWT Reset Type setpoint.

SET UNIT SPs (6) Soft Load = OFF InitialSLAmp=XXX% SoftLoadRamp=Xxmin

Soft Load settings can be OFF or ON as determined from the Soft Load setpoint. InitialSLAmp is the percent of full load amps that the unit starts to ramp up. SoftLoadRamp is number of minutes (1 to 60) to load from the initial percent amps to 100 percent amps.

SET UNIT SPs (7) Max/Min LWT Rates

Max = X.X°°°°F/min Min = X.X°°°°F/min

These setpoints determine the maximum and minimum allowable rate of chilled water temperature change. They may take precedence over loading rates based on the SoftLoad ramp.

SET UNIT SPs (8) EvapRecTmr =X.Xmin EvapPump = #1 ONLY CondPump = #2 PRIM

Evap and Cond Pump settings can be #1 ONLY, #2 ONLY, #1 PRIM (Primary), #2 PRIM or AUTO as determined from the Evap Pump or Cond Pump setpoints.

SET UNIT SPs (9) Templifier

SrcNoStart =XX°°°°F Delta Reset=XX°°°°F

These settings only apply to Templifier units. SrcNoStart sets the entering source water temperature below which the unit is prevented from starting. Delta Reset sets the source water temperature below which the hot water temperature is reset down as the source water temperature drops.

SET UNIT SPs (10) VFD = Yes Min Speed = XXX%

Spd/Lift=XXX%/XX°°°°F

VFD settings can be NO or YES as determined by the VFD set point.

SET UNIT SPs (11) Max Wtr Flow Rates Evap WF = XXXXX GPM Cond WF = XXXXX GPM

These setting are used when field supplied and installed flow meters are present to calibrate them.

OM Centrif Micro ΙΙ-5 53

LESS

GAIN

SET UNIT SPs (12) CLOCK dd/mmm/yyyy hh:mm:ss

SET UNIT SPs (13) Units = °°°°F/psi

Lang = ENGLISH

SET UNIT SPs (14) Protocol = Ident Number + Baud Rate =

SET UNIT SPs (15) Ex Valve Gain = 100 Offset(Slope) = 271

Prs Ctrl Dout = 10°°°°F

Screen 15 controls the electronic expansion valve (EXV) and is set as close as possible to known job operating conditions. Ex Valve Gain values less than the default of 100 pivot the curve slope to the right (downward). Values greater than the default of 100 pivot the slope upward, resulting in a greater valve opening for a given condenser delta-T, with the effect increasing as the delta-T increases. Very little effect is seen at low delta-Ts (low loads). See Figure 30.

Offset (Slope) values above 271 move the curve upward parallel, increasing the valve opening the same amount regardless of the condenser delta-T. Values less than 271 have the opposite effect.

Prs Ctrl Dout (pressure control dropout) setting determines the leaving chilled water temperature at which the EXV transitions from pressure control based on chilled water temperature to program control based on condenser delta-T (trimmed by lift). This pressure control mode provides a controlled pulldown of the chilled water temperature on system startup.

Figure 30, EXV Control Parameters (Program Control Mode)

1,000

EEX

OPENING

+ OFFSET

54 OM Centrif Micro ΙΙ-5

CONDENSER T and LIFT FACTOR

Figure 31, Pressure Control Dropout

80°F

PRESSURE CONTROL MODE

LEAVING CHILLED

WATER

TEMP

DROP OUT TEMP

LWT SETPOINT

40°F

TIME

(PULLDOWN)

PROGRAM CONTROL MODE

Set Compressor Setpoints

SET COMP#N SPs (1) Demand Limit = OFF Minimum Amps =XXX% Maximum Amps =XXX%

Demand Limit settings can be OFF or ON as determined from the Demand Limit setpoint.

SET COMP#N SPs (2) StageMode = NORMAL StageSequence# =XX Max Comprs ON = XX

StageMode settings can be NORMAL, HI EFF, PUMP, and STANDBY as determined by the Stage Mode setpoint.

NORMAL has the auto-balance sequence that starts compressors with least starts and stops compressors with most hours, in sequence, providing all compressors have the same sequence number. If they have different sequence numbers, say 1, 2, 3, 4, they will always start in that sequence. That is, sequence number will take precedence over auto-balance sequencing.

HI EFF is used with multiple chillers and runs one compressor per chiller when ever possible.

PUMP starts all compressors on the same chiller first, starting with the chiller with the compressor with the least starts (or by sequence number if they are different).

STANDBY is used in multi-compressor systems and reserves a compressor to come on only if there is a failure of another compressor in the system and the standby compressor capacity is required to maintain chilled water temperature.

StageSequence is set for each compressor:

In NORMAL or STANDBY Mode, all compressors can have the same number or a number from 1 up to the total number of compressors. Sequence number has priority over other considerations. If four compressors in a system are given the sequence numbers 1 through 4, they will always start in that order. With the same number they will auto-sequence.

In HI EFF or PUMP, all compressors must have the same sequence number.

Max Comprs ON limits the number of compressors allowed to run in multi-compressor systems. It provides a "floating standby" compressor. All compressor controllers must have the same setting for this setpoint.

OM Centrif Micro ΙΙ-5 55

Full Load = XXX sec

SET COMP#N SPs (3) StageDeltaT= X.X°°°°F

Stop-Start = xx min. Start-Start =xx min.

SET COMP#N SPs (4)

SET COMP#N SPs (5) OilNoStrtDiff=XX°°°°F

Abs Capacity=XXXXT HotGasBypass = XX%

SET COMP#N SPs (6) UnloadTimer=XXXsec PrelubeTmr=xxxsec PostlubeTmr=XXXsec

Be fo r e En t er in g E di t M o d e A f t e r E n t er in g E di t M o d e

SET COMP#N (7) SET COMP#N (7) VaneMode=AUTO VaneMode=AUTO <AUTO Vanes=UNKNOWN Vanes=UNKNOWN <LOAD %RLA = XXX% %RLA = XXX% <UNLD

VaneMode settings can be AUTO or MAN (Manual) as determined from the Vane Mode setpoint. Vanes position is indicated as CLOSED or UNKNOWN as determined from the Vanes Closed switch digital input. When Edit mode is selected on this screen, the <AUTO/<LOAD/<UNLD prompts will appear. Holding the “LOAD” key will then continuously load the compressor and holding the “UNLD“ key will unload it. After releasing either key the compressor will “hold” and the Vane Mode setpoint will be set to Manual. Pressing the AUTO” key will set the Vane Mode back to Auto. After leaving edit mode the <AUTO/<LOAD/<UNLD prompts will be hidden.

The following VFD screen will only be shown if the VFD set point = YES.

Be fo r e En t er in g E di t M o d e A f t e r E n t er in g E di t M o d e

SET COMP#N (8) SET COMP#N (8) VFD Mode=AUTO VFD Mode=AUTO <AUTO VFD = XXX% VFD = XXX% <LOAD %RLA = XXX% %RLA = XXX% <UNLD

VFD Mode settings can be AUTO or MAN (Manual) as determined from the VFD Mode setpoint. VFD speed is shown as 0 to 100%. When Edit mode is selected on this screen, the <AUTO/<LOAD/<UNLD prompts will appear. Holding the “LOAD” key will then continuously speed up the VFD and holding the “UNLD“ key will slow it down. After releasing either key the VFD will stay at the current speed and the VFD Mode setpoint will be set to Manual. Pressing the AUTO” key will set the VFD Mode back to Auto. After leaving edit mode the <AUTO/<LOAD/<UNLD prompts will be hidden.

56 OM Centrif Micro ΙΙ-5

Staging Parameters

Full Load Determination

Each compressor determines if it is at its maximum capacity (or maximum allowed capacity) and, if so, set its Full Load flag. The flag shall be set (full load) when one or more of the following conditions are met.

• The compressor is at its physical limit of capacity which means:

For VFD Set Point = NO: The load output has been pulsed ON for a cumulative time equal to or greater than the Full Load set point. Any unload pulse shall reset the cumulative time to zero.

For VFD Set Point = YES: Load pulsing has exceeded the Full Load set point (as described above) AND the VFD speed = 100%

The Vanes Open digital input is On AND the VFD speed = 100%.

• The %RLA is above or equals the Maximum Amp limit set point.

• The %RLA is above or equals the Demand Limit analog input value

• The %RLA is above or equals the Network Limit value

• The evaporator pressure is below the Low Evap Pressure-Inhibit set point.

When none of the above conditions are met, the Full Load flag shall be cleared.

Absolute Capacity

Each compressor shall estimate its absolute capacity from the present value of %RLA and the Absolute Capacity set point from the equation:

Absolute Capacity = (%RLA Factor) * (Absolute Capacity set point)

Where the %RLA Factor is interpolated from the following table.

%RLA 0 50 75 100 150

%RLA Factor 0 0.35 0.75 1.00 1.50

Multiple Compressor Staging

• This section defines which compressor is the next one to start or stop. The next section defines when the

start, or stop, is to occur.

Functions

• Can start/stop compressors according to an operator defined sequence.

• Can start compressors based on # of starts (run hours if starts are equal) and stop on run hours.

• The above two modes can be combined so that there are two or more groups where all

compressors in the first group are started (based on number of starts/hours) before any in the second group, etc. Conversely, all compressors in a group are stopped (based on run hours) before any in the preceding group, etc.

• An “efficiency priority” mode can be selected for two or more chillers where one compressor

is started on each chiller in the group before a second is started on any of them.

• A “pump priority” mode can be selected for one or more chillers where all compressors on a

given chiller are started before going to the next chiller in the group.

• One or more compressors can be defined as “standby” where it is never used unless one of the

normal compressors is unavailable.

OM Centrif Micro ΙΙ-5 57

TowerControl = None

Tower Stages = x

StageUP/DN=XXX/XXX%

SET TOWER SPs (3)

StageDiff =XX.Xpsi

Stage Up = XX min

StageDown = XX min

Set Alarm Setpoints

SET ALARM LMTS (1) LowEvPrHold=XXXpsi LowEvPrUnld=XXXpsi LowEvPrStop=XXXpsi

SET ALARM LMTS (2) HighCondPr=XXXXpsi

HiDschT-Load=XXX°°°°F HiDschT-Stop=XXX°°°°F

SET ALARM LMTS (3) HiOilFeedTmp=XXX°°°°F LowOilDeltaT =XX°°°°F

LowNetOilPr=XXXpsi

SET ALARM LMTS (4) HighSSH-Start=XX°°°°F HighSSH-Run =XX°°°°F

MtrCurrThrshld=XX%

SET ALARM LMTS (5) Evap Freeze=XX.X°°°°F Cond Freeze=XX.X°°°°F

Set Tower Setpoints

NOTE: A complete description of the setup for cooling towers is found on page 31.

SET TOWER SPs (1)

TowerControl settings can be None, Temp, or Lift. Stages is the number of fans controlled, 1 to 4.

Tower Control = Temp/None Tower Control = Lift

SET TOWER SPs (2) SET TOWER SPs (2) Stage ON (Temp)°°°°F

Stage ON (Lift)psi

#1 #2 #3 #4 #1 #2 #3 #4 XXX XXX XXX XXX XXX XXX XXX XXX

Tow er Co nt r o l =Te m p /N on e To w e r C on t ro l= L if t ( p si )

StageDiff = XX.X°°°°

58 OM Centrif Micro ΙΙ-5

Valve SP = XXX psi

Valve DB = XXX.Xpsi

Valve Control Range

Min = XXX%

Max = XXX%

PD Control Loop

Error Gain = XX

Slope Gain = XX

SET TOWER SPs (4) Valve/VFD Control= ValveSP/VFDStage Valve Type = NC

Valve/VFD Control settings are None, Valve Setpoint, Valve Stage, VFD Stage, or ValveSP/VFDStage. Valve Type settings are NC (normally closed to tower) or NO (normally open).

Tow er Co nt r o l = Temp / N o ne To we r C on tr o l = L if t

SET TOWER SPs (5) SET TOWER SPs (5) Valve SP = XXX °°°°F Valve DB = XX.X °°°°F

SET TOWER SPs (6) ValveStartPosition

Min = XXX% @XXX°°°°F Max = XXX% @XXX°°°°F

SET TOWER SPs (7)

SET TOWER SPs (8)

OM Centrif Micro ΙΙ-5 59

Alarms

When an alarm occurs, the alarm type, limit value (if any), date, and time are stored in the active alarm buffer corresponding to that alarm (viewed on the Active Alarm screen) and also in the alarm history buffer (viewed on the Alarm History screen). The active alarm buffers hold a record of the last occurrence of each alarm and whether or not it has been cleared. The alarm can be cleared by pressing the Edit key. A separate buffer is available for each alarm (High Cond Pressure, Evaporator Freeze Protect, etc.). The alarm history buffer holds a chronological account of the last 50 alarms of any type.

Security

Entering on the Unit Controller

Two four-digit passwords provide OPERATOR and MANAGER levels of access to changeable parameters. Either password can be entered using the SET PASSWORD screen which can be accessed either through the SET OTHER menu or by simply pressing the ENTER key while on one of the SET screens. The password can then be entered by

1. Press the ENTER key.

2. Move to each number space to be changed with the right or left button.

3. Enter the correct value by scrolling with the UP and DOWN arrow keys. The password is

right justified on the controller screen. The operator password would look like 00100, the manager password would be 02001.

4. Press ENTER again to enter the password

Once the correct password has been entered, the previously selected screen will reappear. Once a password has been entered, it will remain valid for 15 minutes after the last key-press. Parameters and screens that require the MANAGER password will not be displayed unless the MANAGER password is active.

Entering on the OITS

When a password is required, the touch screen will automatically go to the screen keyboard. Numbers are left justified and the operator password would be 100 (appearing as *** in the window). See page 24 for further information.

60 OM Centrif Micro ΙΙ-5

ALARM

Compressor Controller

A general description of the unit controller with its inputs and outputs is on page 8. This section will briefly describe the operation of the controller, define the screen hierarchy and how to navigate through it and also give a description of the screens.

Relevant compressor information and setpoint changes are available on the OITS and on the unit controller. There is little need to consult the compressor controller(s).

4x20 Display & Keypad

Layout

The 4-line by 20-character/line liquid crystal display and 6-key keypad are shown below.

Figure 32, Display (in MENU mode) and Keypad Layout

Key to Screen Pathway

Air Condit ioning

MENU Key

VIEW

< <

SET

ARROW Keys

ENTER Key

Note that each ARROW key has a pathway to a line in the display. Pressing an ARROW key will activate the associated line when in the MENU mode.

Getting Started

There are two basic procedures to learn in order to utilize the MicroTech II controller:

1. Navigating through the menu matrix to reach a desired menu screen and knowing where a

particular screen is located.

2. Knowing what is contained in a menu screen and how to read that information or how to

change a setpoint contained in the menu screen.

Navigating

The menus are arranged in a matrix of screens across a top horizontal row. Some of these toplevel screens have sub-screens located under them.

There are two ways to navigate through the menu matrix to reach a desired menu screen.

One is to scroll through the matrix from one screen to another using the four ARROW keys.

The other way is to use shortcuts to work through the matrix hierarchy. From any menu screen, pressing the MENU key will take you to the top level of the hierarchy. The display will show ALARM, VIEW, and SET as shown in Figure 32. One of these groups of screens can then be selected by pressing the key connected to it via the pathway.

OM Centrif Micro ΙΙ-5 61

For example, selecting ALARM will go the next row of menus under ALARM (ALARM LOG or ACTIVE ALARM). Selecting VIEW will go the next level of screens under VIEW (VIEW UNIT STATUS or VIEW UNIT TEMP). Selecting SET will go to a series of screens for looking at and changing setpoints.

MENU Key

The MENU key is used to switch between the shortcut method (known as the MENU mode and as shown in Figure 32) and scrolling method (known as the SCROLL mode). The MENU mode is the shortcut to specific groups of menus used for checking ALARMS, for VIEWING information, or to SET setpoint values. The SCROLL mode allows the user to move about the matrix (from one menu to another, one at a time) by using the four ARROW keys.

Pressing the MENU key from any menu screen will automatically return you to the MENU mode.

Figure 33, Display in the Shortcut (SCROLL) Mode and Keypad Layout

Air Condit ioning

MENU Key

VIEW UNIT STATUS Unit = COOL Compr. #1/#2=OFF/OFF Evap Pump = RUN

ARROW Keys

ENTER Key

Menu Screens

Various menus are shown in the controller display. Each menu screen shows specific information; in some cases menus are used only to view the status of the unit, in some cases they are used for checking and clearing alarms, and in some case they are used to set setpoint values.

The menus are arranged in a matrix of screens across a top horizontal row. Most of these top-level screens have sub-screens located under them.

The ARROW keys on the controller are used to navigate through the menus. The keys are also used to change numerical setpoint values contained in certain menus.

Compressor Controller Setpoints

Set Compressor Setpoints

NOTE: In the following SET COMP screens, the #N field indicates which compressor (#1, #2, etc.) is being set and is not shown on single compressor units. Screens are shown for compressor #1 only. Screens for compressor #2 for dual compressor units are identical to #1.

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Table 24, Compressor Setpoints

Description Default Range PW Unit (Duplicates)

Unit Enable OFF OFF, ON O

Unit Mode COOL COOL, ICE, HEAT, TEST

Cool LWT Ice LWT Heat LWT Startup Delta T Shutdown Delta T

VFD

Compressor VFD No No, Yes T VFD Minimum Speed 70% 70 to 100% T Speed @ 0 Lift 50% 0 to 100% T Lift @ 100% Speed

Motor Amps

Demand Limit Enable OFF OFF, ON O Minimum Amps 40% 5 to 80% T Maximum Amps 100% 10 to 100% T Soft Load Enable OFF OFF, ON M Initial Soft Load Limit 40% 10 to 100% M Soft Load Ramp Time 5 min 1 to 60 min M Maximum LWT Rate Minimum LWT Rate

Staging

Comp Stage Mode Normal

Comp Stage Sequence # 1 1,2, … (# of Compressors) M Maximum Compressors ON 1 1-16 M Stage Delta T 1.0 0.5-5.0 M Full Load Timer 120 sec 0 to 999 sec T Nominal Capacity Per Comp 0 to 9999 T

Timers

Start-Start 40 min 15 to 60 min M Stop-Start 3 min 3 to 20 min M

Oil

Oil Feed Temperature Oil No Start Diff (above Evap Temp)

Templifier

Source No Start

Alarms

Evaporator Freeze Protection Condenser Freeze Protetion Low Evap Pressure-Stop 26 psi 10 to 45 psi T Low Evap Pressure-Inhibit 38 psi 20 to 45 psi T Low Evap Pressure-Unload 31 psi 20 to 45 psi T High Discharge Temperature-Stop High Discharge Temperature-Load High Condenser Pressure 140 psi 120 to 240 psi T Motor Current Threshold 10% 3 to 99% T High Oil Feed Temperature Low Oil Delta Temperature Low Net Oil Pressure 40 psi 30 to 60 psi T Surge Slope Limit Surge Temp Limit Service Vane Mode AUTO AUTO, MANUAL T VFD Mode AUTO AUTO, MANUAL T Hot Gas Bypass 30% 20 to 70% T Unload Timer 30 sec 10 to 240 sec T Postlube Timer 30 sec 10 to 240 sec T

Note 1: Through Version C, minimum value was 90°F.

44. 0°F 35.0 to 80.0 °F

25. 0°F 15.0 to 35.0 °F

135. 0°F 100.0 to 150.0 °F

3.0°F 0.5 to 10.0 °F

3.0°F 0.0 to 3.0 °F

40 °F 30 to 60 °F

0.5 °F/min 0.1 to 5.0 °F/min

0.1 °F/min 0.0 to 5.0 °F/min

Normal, Efficiency, Pump,

100 °F 100 to 190 °F (Note 1)

40 °F 30 to 60 °F

70 °F 50 to 100 °F

34.0 °F -9.0 to 45.0 °F

190 °F 120 to 240 °F 170 °F 120 to 240 °F

140 °F 120 to 240 °F

30 °F 20 to 80 °F

20 °F

7 °F 2 to 25 °F

Standby

1 to 99 Deg F/min T

T O O O O O

M M

OM Centrif Micro ΙΙ-5 63

Full Load = XXX sec

SET COMP#N SPs (1) Demand Limit = OFF Minimum Amps =XXX% Maximum Amps =XXX%

Demand Limit settings can be OFF or ON as determined from the Demand Limit setpoint.

SET COMP#N SPs (2) StageMode = NORMAL StageSequence# =XX Max Comprs ON = XX

StageMode settings can be NORMAL, HI EFF, PUMP, and STANDBY as determined by the Stage Mode setpoint. NORMAL is the auto balance sequence starting compressors with least starts and stopping with most hours, in sequence. HI EFF is used with multiple dual compressor chillers and runs one compressor per chiller when ever possible. PUMP starts all compressors on the same chiller first starting with the chiller with the compressor with the least starts. STANDBY is used in multi-compressor systems and reserves a compressor to come on only if there is a failure of another compressor in the system and the standby compressor capacity is required to maintain chilled water temperature.

StageSequence is set for each compressor:

In HI EFF or PUMP, all compressors must have the same sequence number.

SET COMP#N SPs (3) StageDeltaT= X.X°°°°F

Stop-Start = xx min. Start-Start =xx min.

SET COMP#N SPs (4)

SET COMP#N SPs (5) OilNoStrtDiff=XX°°°°F

Abs Capacity=XXXXT HotGasBypass = XX%

64 OM Centrif Micro ΙΙ-5

SET COMP#N SPs (6) UnloadTimer=XXXsec PrelubeTmr=xxxsec PostlubeTmr=XXXsec

Be fo r e En t er in g E di t M o d e A f t e r E n t er in g E di t M o d e

SET COMP#N (7) SET COMP#N (7) VaneMode=AUTO VaneMode=AUTO <AUTO Vanes=UNKNOWN Vanes=UNKNOWN <LOAD %RLA = XXX% %RLA = XXX% <UNLD

Th e f ol lo w i n g V F D s cre en w i ll o n l y b e s ho wn i f t he V F D se t p oi n t = Y E S.

Be fo r e En t er in g E di t M o d e A f t e r E n t er in g E di t M o d e

SET COMP#N (8) SET COMP#N (8) VFD Mode=AUTO VFD Mode=AUTO <AUTO VFD = XXX% VFD = XXX% <LOAD %RLA = XXX% %RLA = XXX% <UNLD

Staging Parameters

Full Load Determination

• The compressor is at its physical limit of capacity which means:

For VFD Set Point = NO: The load output has been pulsed ON for a cumulative time equal to or greater than the Full Load set point. Any unload pulse shall reset the cumulative time to zero. The cumulative time must be limited (to a value above the maximum allowed setting of the Full Load set point) so that no wrap occurs.

For VFD Set Point = YES: Load pulsing has exceeded the Full Load set point (as described above) AND the VFD speed = 100%

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