EC10E1142 - Hammond Courthouse Final O M

Ver 7.28.08LETTER OF TRANSMITTAL / REQUEST

Date: 12/14/2010 Job Number: EC10E1142

Attention:

1770 Mason Morrow Road Brian Newell

Lebanon, Ohio 45036 To:

(513) 398-9800 Kirwan Mechanical Services, Inc.

23840 W. Industrial Drive South

WE ARE REQUESTING: Plainfield, Illinois 60585

Reference: Hammond Federal Courthouse Project

X WE ARE SENDING YOU:

Parts Attached Shop Drawings Prints

Plans Samples Specifications Copy of Letter

Change Order

Qty

TRANSMITTED: For approval For your use As requested

X For review and comment Approved as submitted Approved as noted Returned for corrections

Resubmit ____ copies for approval Submit 1 copies for distribution

FOR BIDS DUE ____________________ 20__ PRINTS RETURNED AFTER LOAN TO US

TAC REVIEWED

REMARKS

TAC SIGNED RECEIVED BY

COPY TO WAREHOUSE

PAGE 1 OF 1 DATE

TAC PO Number

N/A Specification Section 230900 DDC System O&M / As-Builts Package

Description

1770 Mason Morrow Road Lebanon, Ohio 45036-9298 513-398-9800

513-398-0161 FAX

513-770-5754 DIRECT

DATE: 12/14/10

TO: Kirwan Mechanical Service, Inc.

ATTN: Brian Newell FROM: Phil Thierauf RE: Hammond Federal Courthouse O&M / As-Built Package

Mr. Newell, The following is the O&M / As-Built Package for the Hammond Federal Courthouse 2010 Project containing the following documentation:

• Sequences of Operation

• Material Cutsheets

• As-Built Drawings with Bill of Materials

Respectfully, Phil Thierauf Schneider Electric

Hammond Federal Courthouse 2010 Chilled Water System

Sequences of Operation (Final As Built – 12/10)

Sequences Of Operation Index Pages

Chilled Water System Points List 1 – 2 Chilled Water System Layout 2 Overall Chilled Water System Control Strategy 2 – 3 Overall Condenser Water System Control Strategy 3 Chilled Water System Enable/Disable Control 3 Typical Chiller System Startup Control 4 Typical Chiller System Shutdown Control 4 Chillers CH-1 and CH-2 Individual Chiller Alarm Lockout Conditions 5 Chiller Systems Lead/Lag Control 5 – 6 Primary CHW Pumps Control 6 – 8 Tower Water Pumps Control 9 – 11 Local CHW Bypass Valve Control 11 Cooling Towers System Control 11 Cooling Tower Bypass Valve Control 11 Condenser Water Tank Level Control 12 Chiller Room Ventilation Control 12 Chilled Water System Alarm and Message Notifications 13

Chilled Water System:

The Chilled Water System shall consist of (3) Chillers, (4) Primary CHW Pumps with

VFD’s, (4) Tower Water Pumps with VFD’s, a local CHW System Bypass Valve, (3) Cooling Towers each with a Fan equipped with a VFD, and a Cooling Tower Bypass Valve. The DDC system shall control and monitor the following points associated with the Chilled Water System:

INPUTS OUTPUTS

Chiller CH-1 Alarm – DI Chiller CH-1 S/S – DO Chiller CH-1 CHW Iso. Valve Feedback – AI Chiller CH-1 CHW Iso. Valve – AO Chiller CH-1 CDW Iso. Valve Feedback – AI Chiller CH-1 CDW Iso. Valve – AO Chiller CH-2 Alarm – DI Chiller CH-2 S/S – DO Chiller CH-2 CHW Iso. Valve Feedback – AI Chiller CH-2 CHW Iso. Valve – AO Chiller CH-2 CDW Iso. Valve Feedback – AI Chiller CH-2 CDW Iso. Valve – AO Chiller CH-3 Status – DI Chiller CH-3 S/S – DO Chiller CH-3 Alarm – DI Chiller CH-3 CHW Iso. Valve O/C – DO Chiller CH-3 CDW Iso. Valve O/C – DO CHW Pump P-1 VFD Status – DI CHW Pump P-1 VFD S/S – DO CHW Pump P-1 VFD Alarm – DI CHW Pump P-4 VFD Status – DI CHW Pump P-4 VFD S/S – DO CHW Pump P-4 VFD Alarm – DI CHW Pump P-6 VFD Status – DI CHW Pump P-6 VFD S/S – DO CHW Pump P-6 VFD Alarm – DI CHW Pump P-7 VFD Status – DI CHW Pump P-7 VFD S/S – DO CHW Pump P-7 VFD Alarm – DI Common CHW Supply Temp. – AI Common CHW Return Temp. – AI Remote CHW Differential Pressure – AI CHW System Bypass Valve – AO Tower Water Pump P-2 VFD Status – DI Tower Water Pump P-2 VFD S/S – DO Tower Water Pump P-2 VFD Alarm – DI Tower Water Pump P-2 VFD – AO Tower Water Pump P-3 VFD Status – DI Tower Water Pump P-3 VFD S/S – DO Tower Water Pump P-3 VFD Alarm – DI Tower Water Pump P-3 VFD – AO Tower Water Pump P-5 VFD Status – DI Tower Water Pump P-5 VFD S/S – DO Tower Water Pump P-5 VFD Alarm – DI Tower Water Pump P-5 VFD – AO Tower Water Pump P-8 VFD Status – DI Tower Water Pump P-8 VFD S/S – DO Tower Water Pump P-8 VFD Alarm – DI Tower Water Pump P-8 VFD – AO Chillers CDW Differential Pressure – AI CDW Tank Level – AI CDW Tank MUW Valve O/C – DO Cooling Tower #1 Fan VFD Status – DI Cooling Tower #1 Fan VFD S/S – DO Cooling Tower #1 Fan VFD Alarm – DI Cooling Tower #1 Fan VFD – AO Cooling Tower #2 Fan VFD Status – DI Cooling Tower #2 Fan VFD S/S – DO Cooling Tower #2 Fan VFD Alarm – DI Cooling Tower #2 Fan VFD – AO Cooling Tower #3 Fan VFD Status – DI Cooling Tower #3 Fan VFD S/S – DO Cooling Tower #3 Fan VFD Alarm – DI Cooling Tower #3 Fan VFD – AO Common Chiller CDW Enter Temp. – AI Cooling Tower Bypass Valve – AO Common Chiller CDW Leaving Temp. – AI R-22 Refrigerant Monitor – AI R-134a Refrigerant Monitor Alarm – DI Chiller Room Space Temperature – AI CH-1 Supply Fan SF-37 Status – DI CH-1 Supply Fan SF-37 S/S – DO CH-2 Supply Fan SF-38 Status – DI CH-2 Supply Fan SF-38 S/S – DO CH-3 Supply Fan SF-39 Status – DI CH-3 Supply Fan SF-39 S/S – DO

CH-1 Exhaust Fan EF-40 Status – DI CH-1 Exhaust Fan EF-40 S/S – DO CH-2 Exhaust Fan EF-41 Status – DI CH-2 Exhaust Fan EF-41 S/S – DO CH-3 Exhaust Fan EF-42 Status – DI CH-3 Exhaust Fan EF-42 S/S – DO

Chilled Water System Layout

The Chilled Water System consists of (3) Chillers which are piped in parallel with one another. Each Chiller is equipped with a CHW Isolation Valve and a CDW Isolation Valve. The Chillers are served by (4) Primary CHW Pumps which are piped in parallel with one another, and

(4) Tower Water Pumps which are piped in parallel with one another. The Chilled Water System is also equipped with a Local CHW Bypass Valve which is modulated to maintain a Remote CHW Differential Pressure setpoint, (3) Cooling Towers each with a Fan equipped with a VFD, and a Cooling Tower Bypass Valve.

Overall Chilled Water System Control Strategy

The Chilled Water System shall be enabled and disabled based on the Outdoor Air Temperature, a Time Schedule that is determined by the building operator and the Level of Water in the Condenser Water Tank. Chiller CH-3 is designated as the Emergency Chiller and shall not be used unless the Building Operator manually enables this Chiller System at the Front-End PC.

Chillers CH-1 and CH-2 shall be controlled using Lead/Lag logic with the Lag Chiller being staged on and off based on the %RLA of the Lead Chiller, or the calculated Tonnage of each Chiller.

The primary means of staging the Lag Chiller off and on shall be via the %RLA value of each Chiller. The DDC system shall monitor the %RLA of each Chiller using the LON interface between the Chillers and the DDC system. If the LON interface goes down, the DDC system shall ignore the %RLA values of each Chiller and use the calculated Tonnage for each Chiller using the following calculation:

• Chiller Tonnage = 0.0417 x Chiller GPM x (CHWRT – CHWST).

• Chiller #1 Tonnage Calculation shall use a Constant Value of 390 GPM.

• Chiller #2 Tonnage Calculation shall use a Constant Value of 416 GPM.

• The CHWRT shall be the Common CHW Return Temperature value.

• The CHWST shall be the Common CHW Supply Temperature value.

• A Tonnage % shall be calculated for each Chiller with a Maximum Tonnage rating of

200 Tons for each Chiller.

When the DDC system registers that the LON interface between the DDC system and both of the Chiller LON cards is working properly, the DDC system shall use the following Strategy to Stage the Chillers on and off based on the %RLA of the Lead Chiller:

• When the Chilled Water System is initially enabled, the Lead Chiller shall be enabled.

• When the Chilled Water System is disabled, the Lead Chiller shall be disabled.

• When the Lead Chiller’s %RLA has remained greater than 70% for a continuous time period of 30 minutes (adj.), the Lag Chiller shall be enabled.

• When the Lead Chiller’s %RLA and the Lag Chiller’s %RLA have both remained less than

35% (adj.) for a continuous time period of 30 minutes (adj.), the Lag Chiller shall be disabled.

• When any of the Primary CHW Pumps is running, the Local CHW Bypass Valve shall modulate to maintain the CHW System Differential Pressure setpoint.

When the DDC system registers that the LON interface between the DDC system and either of the Chiller LON cards is not working properly, the DDC system shall use the following Strategy to Stage the Chillers on and off based on the %Tonnage of the Lead Chiller:

• When the Chilled Water System is initially enabled, the Lead Chiller shall be enabled.

• When the Chilled Water System is disabled, the Lead Chiller shall be disabled.

• When the Lead Chiller’s Tonnage% has remained greater than 80% for a continuous time period of 30 minutes (adj.), the Lag Chiller shall be enabled.

• When the Lead Chiller’s Tonnage% and the Lag Chiller’s Tonnage% have both remained less than 35% (adj.) for a continuous time period of 30 minutes (adj.), the Lag Chiller shall be disabled.

• When any of the Primary CHW Pumps is running, the Local CHW Bypass Valve shall modulate to maintain the CHW System Differential Pressure setpoint.

Overall Condenser Water System Control Strategy

The Condenser Water System shall be enabled and disabled based on the status of the Tower Water Pumps. When a Tower Water Pump is running, the Cooling Towers shall be enabled to maintain the Common Chillers CDW Entering Temperature setpoint of 80 deg F (adj.), and the Cooling Tower Bypass Valve shall modulate to maintain a Common Chillers CDW Leaving Temperature setpoint of 75 deg F (adj.). If the Cooling Tower Fans are needed, all of the Cooling Tower Fans shall run and modulate together to maintain the Common Chillers CDW Entering Temperature setpoint.

Chilled Water System Enable/Disable Control The Chilled Water System shall be enabled and disabled based on the Outdoor Air Temperature, a Time Schedule that is determined by the building operator and the Level of Water in the Condenser Water Tank. The DDC system shall allow the Chilled Water System to be enabled when the Level of Water in the Condenser Water Tank is greater than 30” (adjustable) and when the Time Schedule is allowing the Chilled Water System to run. When the Time Schedule is calling for the Chilled Water System to be disabled or when the Level of Water in the Condenser Water Tank is less than 30”, the DDC system shall disable the Chilled Water System regardless of the Outdoor Air Temperature strategy described next.

When the Time Schedule is allowing the Chilled Water System to run and the Level of Water in the Condenser Water Tank is greater than 30”, the DDC system shall enable and disable the Chilled Water System based on the Outdoor Air Temperature. The building operator shall manually control the Outdoor Air Temperature Cooling Enable setpoint through the Front-End PC. When the Outdoor Air Temperature has risen above the OAT Cooling Enable setpoint by 1 deg F, the DDC system shall enable the Chilled Water System. When the Outdoor Air Temperature drops below the OAT Cooling Enable setpoint by 1 deg F, the DDC system shall disable the Chilled Water System.

Typical Chiller System Startup Control The DDC system shall control and monitor all of the Pumps and Valves needed to serve a

Chiller. The DDC system shall follow the following routine when preparing to bring a Chiller on-line as detailed in the Overall Chilled Water System Control Strategy:

1) Ensure that the Chiller is available for operation. The DDC system will lock out a Chiller due to various Chiller Alarm conditions. If the Chiller is available for operation, the DDC system will proceed with the start-up of a Chiller System as follows.

2) The DDC system shall open the Chiller’s CHW and CDW Isolation Valves. If either of the Isolation Valves fails, the DDC system will not attempt to enable the Chiller.

3) After the Chiller’s CHW Isolation Valve has been commanded open, the DDC system shall start the proper Primary CHW Pump. If none of the Primary CHW Pumps are running, the DDC system will not attempt to enable the Chiller that is required.

4) After the Chiller’s CDW Isolation Valve has opened past the 20% open position, the DDC system shall start the proper Tower Water Pump or Pumps. The DDC system shall control the Tower Water Pumps on a “plus 1” basis. If 1 Chiller is required to run, then 2 Tower Water Pumps shall be started. If a Chiller is already running when a 2nd Chiller is required to run, then the DDC system shall start a 3rd Tower Water Pump. If none of the Tower Water Pumps are running, the DDC system will not attempt to enable the Chiller that is required.

5) After the DDC system registers that all of the above conditions have been met, the DDC system shall enable the Chiller to run. In addition to the above listed conditions, each Chiller shall be fitted with a CHW Differential Pressure Switch and a CDW Differential Pressure Switch. These DP Switches shall be hardwired to the Chiller to prevent the Chiller from operating when there is an absence of either CHW or CDW flow through the Chiller.

Typical Chiller System Shutdown Control

Chiller. The DDC system shall follow the following routine when shutting down a Chiller as detailed in the Overall Chilled Water System Control Strategy:

1) The DDC system shall first disable the Chiller and allow the Chiller to remain disabled for a minimum time period of 5 minutes (adjustable) before any other actions are taken.

2) After the 5 minute time period has elapsed, the DDC system shall close the Chiller’s CHW and CDW Isolation Valves.

3) When the Chiller’s CHW Isolation Valve has closed past the 20% open position, the DDC system shall stop the operating Primary CHW Pump. If a Chiller is shutdown while another Chiller is still running, the most Lag Primary CHW Pump shall be stopped while the most Lead Primary CHW Pump shall continue to run.

4) When the Chiller’s CDW Isolation Valve has closed past the 20% open position, the DDC system shall stop the operating Tower Water Pumps. If a Chiller is shutdown while another Chiller is still running, the most Lag Tower Water Pump shall be stopped while the 2 most Lead Tower Water Pumps continue to run.

Chillers CH-1 and CH-2 Individual Chiller Alarm Lockout Conditions The DDC system shall monitor each Chiller for a General Alarm, and shall monitor the position of each Chiller’s CHW Isolation Valve and CDW Isolation Valve to determine whether the Chiller should be locked out in an ALARM state. When the DDC system has locked a Chiller in an ALARM state, the DDC system shall not attempt to use the Chiller as described previously in the Overall Chilled Water System Control Strategy, and shall use the next available Chiller.

If the DDC system registers that a Chiller’s General Alarm contacts are indicating an Alarm status, or if the DDC system registers a Chiller Isolation Valve Alarm as specified below, the DDC system shall toggle the Normal/Alarm point associated with the Chiller to the ALARM state.

When a Chiller is initially called upon to be enabled, the DDC system shall open the Chiller’s CHW and CDW Isolation Valves. The DDC system shall monitor the feedback signal from the Modulating Valve Actuators. If the DDC system registers that either of the Isolation Valves has not gone to the full open position after a 3-minute time delay (adjustable) from the opening of the Valves, the DDC system shall send an alarm message to the DDC system operator, toggle the Chiller’s Normal/Alarm point to the ALARM state, and shall disable the Chiller System.

When a Chiller has been locked out in the ALARM state due to a Chiller General Alarm condition, the DDC system shall automatically toggle the Chiller’s Normal/Alarm point back to the NORMAL state when the DDC system registers that the Chiller’s General Alarm contacts are no longer indicating an Alarm condition. When a Chiller has been locked out in the ALARM state due to an Isolation Valve Alarm condition, the DDC system operator must manually reset the Chiller’s Isolation Valves Normal/Alarm point back to the NORMAL state at the Front-End PC after the Isolation Valve problem has been diagnosed and fixed.

When a Chiller’s Normal/Alarm point has been reset back to the NORMAL state, the DDC system shall determine whether the Chiller is needed.

• If the newly reset Chiller System is the Lag Chiller System and is not required, then the DDC system shall keep the Lag Chiller System disabled.

• If the Lag Chiller System is running in the place of the newly reset Lead Chiller System, the

DDC system shall attempt to enable the newly reset Lead Chiller System and shall disable the Lag Chiller System. If the newly reset Lead Chiller System goes to the ALARM state, the DDC system shall disable the Lead Chiller System and re-enable the Lag Chiller System.

• If the System Load is such that both the Lead and Lag Chiller Systems are required to run, then the DDC system shall attempt to enable the newly reset Chiller System.

Chiller Systems Lead/Lag Control The DDC system shall switch the Lead/Lag designations on the Chillers on a monthly basis automatically, or via manual command by the DDC system operator.

• When the Lead/Lag Chiller System designations are switched when there is no call for either

Chiller System to run, the DDC system shall switch the Lead/Lag Chiller System designations and keep the Chiller Systems disabled.

• When the Lead/Lag Chiller System designations are switched when both Chiller Systems are enabled and running, the DDC system shall switch the Lead/Lag Chiller System designations and keep both Chiller Systems enabled.

• When the Lead/Lag Chiller System designations are switched with the Lead Chiller System running, and the Lag Chiller System disabled in its NORMAL state, the DDC system shall enable the new Lead Chiller System and disable the new Lag Chiller System. If the DDC system registers that the new Lead Chiller System has gone to the ALARM state, the DDC system shall disable the new Lead Chiller System and re-enable the new Lag Chiller System.

• When the Lead/Lag Chiller System designations are switched with the Lead Chiller System in the ALARM state and the Lag Chiller System running in its place, the DDC system shall continue to run the new Lead Chiller System, and shall continue to keep the new Lag Chiller System disabled in the ALARM state.

• When the Lead/Lag Chiller System designations are switched with the Lead Chiller System running and the Lag Chiller System disabled in the ALARM state, the DDC system shall continue to run the new Lag Chiller System and shall continue to keep the new Lead Chiller System disabled in the ALARM state.

Primary CHW Pumps Control

The Primary CHW Pumps that serve Chillers CH-1 and CH-2 shall be controlled using Lead/Lag1/Lag2/Lag3 logic, and shall be used to provide Chilled Water Flow to the Building through Chillers CH-1 and CH-2 as described previously. Each Primary CHW Pump shall be fitted with a VFD. When the DDC system is running a Primary CHW Pump, the DDC system shall run the Pump at a constant speed setting (to be determined by the Test and Balance contractor).

The DDC system shall monitor the Run Status of each Pump via the Run Contacts in each VFD. If the DDC system does not register a RUN status on a Primary CHW Pump VFD after a 30 second time delay (adj.) after an initial start, or if the DDC system registers a STOP status on a Primary CHW Pump VFD during normal operation of the Pump, the DDC system shall send an alarm message to the DDC system operator, stop the Primary CHW Pump, and toggle the Pump’s Normal/Alarm point to the ALARM state.

When a Primary CHW Pump has been locked out in an ALARM state due to a Pump Run Status Alarm condition, the DDC system operator must manually reset the Failed Pump Normal/Alarm point back to the NORMAL state at the Front-End PC. When a Primary CHW Pump’s Normal/Alarm point has been reset back to the NORMAL state, the DDC system shall determine whether the Primary CHW Pump is needed.

• If the newly reset Primary CHW Pump is not required, then the DDC system shall keep the

Pump off.

• If another Primary CHW Pump is running in the place of the newly reset Primary CHW

Pump, the DDC system shall attempt to start the newly reset Primary CHW Pump. If the newly reset Primary CHW Pump starts up properly, then the DDC system shall stop the Primary CHW Pump that was running in its place.

When the first of the two Chillers is indexed to run, the DDC system shall open the

Chiller’s CHW Isolation Valve. After the DDC system commands the Chiller’s CHW Isolation Valve to open, the DDC system shall determine which Primary CHW Pump to run.

• If all four of the Primary CHW Pumps are in the ALARM state, then the DDC system shall not attempt to start any of the Primary CHW Pumps.

• If the Lead Primary CHW Pump is in the NORMAL state, then the DDC system shall start the Lead Primary CHW Pump. If the Lead Primary CHW Pump goes to the ALARM state during Startup or during normal operation of the Pump, the DDC system shall stop the Lead Primary CHW Pump and look to start the next available Primary CHW Pump. If a Primary CHW Pump is in the ALARM state, then the Primary CHW Pump will be seen as not being available for operation by the DDC system.

When the second of the two Chillers is indexed to run, the DDC system shall open the Chiller’s CHW Isolation Valve. After the DDC system commands the Chiller’s CHW Isolation Valve to open, the DDC system shall determine which Primary CHW Pump to run.

• If one of the Primary CHW Pumps is running to serve the operating Chiller, and the other 3

Primary CHW Pumps are in the ALARM state, then the DDC system shall not attempt to start any of the 3 remaining Primary CHW Pumps.

• If the Lead Primary CHW Pump is running to serve the operating Chiller, and the Lag1 Primary CHW Pump is in the NORMAL state, then the DDC system shall start the Lag1 Primary CHW Pump. If the Lag1 Primary CHW Pump goes to the ALARM state during Startup or during normal operation of the Pump, the DDC system shall stop the Lag1 Primary CHW Pump and look to start the next available Primary CHW Pump. If a Primary CHW Pump is in the ALARM state, then the Primary CHW Pump will be seen as not being available for operation by the DDC system.

The DDC system shall switch the Lead/Lag1/Lag2/Lag3 designations on the Primary CHW Pumps on a monthly basis automatically, or via manual command by the DDC system operator. When the Lead/Lag1/Lag2/Lag3 Pump designations are switched, the DDC system shall make the Lag3 Pump the Lead Pump, the Lead Pump the Lag1 Pump, the Lag1 Pump the Lag2 Pump, and the Lag2 Pump the Lag3 Pump.

• When the Lead/Lag1/Lag2/Lag3 Pump designations are switched when there is no call for a

Pump to run, the DDC system shall switch the Lead/Lag1/Lag2/Lag3 Pump designations and keep the Pumps off.

• When the Lead/Lag1/Lag2/Lag3 Pump designations are switched with a call for 1 Primary CHW Pump to be running and all of the Primary CHW Pump Normal/Alarm points in their NORMAL states, the DDC system shall continue to run the new Lag1 Pump and shall start the new Lead Pump. If the DDC system registers that the new Lead Pump has started successfully, the DDC system shall stop the new Lag1 Pump. If the DDC system registers that the new Lead Pump has failed to start, the DDC system shall send an alarm message to the DDC system operator indicating a failed Pump and shall continue to run the new Lag1 Pump.

• When the Lead/Lag1/Lag2/Lag3 Pump designations are switched with a call for 1 Primary CHW Pump to be running and the Lag1 Pump running in the place of the Lead Pump which is in the ALARM state, the DDC system shall continue to run the new Lag2 Pump and shall start the new Lead Pump. If the DDC system registers that the new Lead Pump has started successfully, the DDC system shall stop the new Lag2 Pump. If the DDC system registers that the new Lead Pump has failed to start, the DDC system shall send an alarm message to the DDC system operator indicating a failed Pump and shall continue to run the new Lag2 Pump.

• When the Lead/Lag1/Lag2/Lag3 Pump designations are switched with a call for 1 Primary CHW Pump to be running and the Lag2 Pump running in the place of the Lead Pump and Lag1 Pump which are both in their ALARM states, the DDC system shall continue to run the new Lag3 Pump and shall start the new Lead Pump. If the DDC system registers that the new Lead Pump has started successfully, the DDC system shall stop the new Lag3 Pump. If the DDC system registers that the new Lead Pump has failed to start, the DDC system shall send an alarm message to the DDC system operator indicating a failed Pump and shall continue to run the new Lag3 Pump.

• When the Lead/Lag1/Lag2/Lag3 Pump designations are switched with a call for 1 Primary CHW Pump to be running and 3 of the Primary CHW Pumps in their ALARM states, the DDC system shall continue to run the operating Primary CHW Pump and shall not attempt to start any of the other Primary CHW Pumps that are in their ALARM states.

• When the Lead/Lag1/Lag2/Lag3 Pump designations are switched with a call for 2 Primary CHW Pumps to be running and all of the Primary CHW Pump Normal/Alarm points in their NORMAL states, the DDC system shall continue to run the new Lag1 Pump and the new Lag2 Pump, and shall start the new Lead Pump. If the DDC system registers that the new Lead Pump has started successfully, the DDC system shall stop the new Lag2 Pump. If the DDC system registers that the new Lead Pump has failed to start, the DDC system shall send an alarm message to the DDC system operator indicating a failed Pump and shall continue to run the new Lag1 Pump and the new Lag2 Pump.

• When the Lead/Lag1/Lag2/Lag3 Pump designations are switched with a call for 2 Primary CHW Pumps to be running and the Lag2 Pump running in the place of the Lead Pump which is in the ALARM state, the DDC system shall continue to run the new Lag2 Pump and the new Lag3 Pump and shall start the new Lead Pump. If the DDC system registers that the new Lead Pump has started successfully, the DDC system shall continue to run the new Lag2 Pump to run in the place of the failed new Lag1 Pump, and shall stop the new Lag3 Pump. If the DDC system registers that the new Lead Pump has failed to start, the DDC system shall send an alarm message to the DDC system operator indicating a failed Pump and shall continue to run the new Lag2 and the new Lag3 Pumps.

• When the Lead/Lag1/Lag2/Lag3 Pump designations are switched with a call for 2 Primary CHW Pumps to be running and the Lag2 Pump running in the place of the Lag1 Pump which is in the ALARM state, the DDC system shall continue to run the new Lag1 Pump and the new Lag3 Pump and shall start the new Lead Pump. If the DDC system registers that the new Lead Pump has started successfully, the DDC system shall stop the new Lag3 Pump. If the DDC system registers that the new Lead Pump has failed to start, the DDC system shall send an alarm message to the DDC system operator indicating a failed Pump and shall continue to run the new Lag1 and the new Lag3 Pumps.

• When the Lead/Lag1/Lag2/Lag3 Pump designations are switched with a call for 2 Primary CHW Pumps to be running and 2 of the Primary CHW Pump Normal/Alarm points in their ALARM states, the DDC system shall continue to run the operating Primary CHW Pumps and shall not attempt to start either Primary CHW Pump that is in the ALARM state.

Tower Water Pumps Control The Tower Water Pumps that serve Chillers CH-1 and CH-2 shall be controlled using

Lead/Lag1/Lag2/Lag3 logic, and shall be used to provide Condenser Water Flow to the Chillers CH-1 and CH-2 as described previously. Each Tower Water Pump shall be fitted with a VFD.

When the DDC system is running a Tower Water Pump, the DDC system shall modulate the Pump’s VFD to maintain a Chillers Condenser Water Differential Pressure setpoint (to be determined by the Test and Balance contractor). When more than 1 Tower Water Pump is running, the DDC system shall modulate the Pumps together.

The DDC system shall monitor the Run Status of each Pump via the Run Contacts in each VFD. If the DDC system does not register a RUN status on a Tower Water Pump after a 30 second time delay (adj.) after an initial start, or if the DDC system registers a STOP status on a Tower Water Pump during normal operation of the Pump, the DDC system shall send an alarm message to the DDC system operator, stop the Tower Water Pump, and toggle the Pump’s Normal/Alarm point to the ALARM state.

When a Tower Water Pump has been locked out in an ALARM state due to a Pump Run Status Alarm condition, the DDC system operator must manually reset the Failed Pump Normal/Alarm point back to the NORMAL state at the Front-End PC. When a Tower Water Pump’s Normal/Alarm point has been reset back to the NORMAL state, the DDC system shall determine whether the Tower Water Pump is needed.

• If the newly reset Tower Water Pump is not required, then the DDC system shall keep the

Pump off.

• If another Tower Water Pump is running in the place of the newly reset Tower Water Pump, the DDC system shall attempt to start the newly reset Tower Water Pump. If the newly reset Tower Water Pump starts up properly, then the DDC system shall stop the Tower Water Pump that was running in its place.

When the first of the two Chillers is indexed to run, the DDC system shall open the

Chiller’s CDW Isolation Valve. After the DDC system commands the Chiller’s CDW Isolation Valve to open, the DDC system shall determine which Tower Water Pumps to run.

• If all four of the Tower Water Pumps are in the ALARM state, then the DDC system shall not attempt to start any of the Tower Water Pumps.

• If the Lead and Lag 1 Tower Water Pumps are in their NORMAL states, then the DDC system shall start the Lead and Lag1 Tower Water Pumps. If the Lead or Lag1 Tower Water Pump goes to the ALARM state during Startup or during normal operation of the Pump, the DDC system shall stop the failed Tower Water Pump and look to start the next available Tower Water Pump. If a Tower Water Pump is in the ALARM state, then the Tower Water Pump will be seen as not being available for operation by the DDC system.

When the second of the two Chillers is indexed to run, the DDC system shall open the

Chiller’s CDW Isolation Valve. After the DDC system commands the Chiller’s CDW Isolation Valve to open, the DDC system shall determine which Tower Water Pump to run.

• If two of the Tower Water Pumps are running to serve the operating Chiller, and the other 2

Tower Water Pumps are in the ALARM state, then the DDC system shall not attempt to start either of the 2 remaining Tower Water Pumps.

• If the Lead and Lag1 Tower Water Pumps are running to serve the operating Chiller, and the Lag2 Tower Water Pump is in the NORMAL state, then the DDC system shall start the Lag2 Tower Water Pump. If the Lag2 Tower Water Pump goes to the ALARM state during Startup or during normal operation of the Pump, the DDC system shall stop the Lag2 Tower Water Pump and look to start the next available Tower Water Pump. If a Tower Water Pump is in the ALARM state, then the Tower Water Pump will be seen as not being available for operation by the DDC system.

The DDC system shall switch the Lead/Lag1/Lag2/Lag3 designations on the Tower Water Pumps on a monthly basis automatically, or via manual command by the DDC system operator. When the Lead/Lag1/Lag2/Lag3 Pump designations are switched, the DDC system shall make the Lag3 Pump the Lead Pump, the Lead Pump the Lag1 Pump, the Lag1 Pump the Lag2 Pump, and the Lag2 Pump the Lag3 Pump.

• When the Lead/Lag1/Lag2/Lag3 Pump designations are switched when there is no call for a

Pump to run, the DDC system shall switch the Lead/Lag1/Lag2/Lag3 Pump designations and keep the Pumps off.

• When the Lead/Lag1/Lag2/Lag3 Pump designations are switched with a call for 2 Tower Water Pumps to be running and all of the Tower Water Pump Normal/Alarm points in their NORMAL states, the DDC system shall continue to run the new Lag1 Pump and the new Lag2 Pump, and shall start the new Lead Pump. If the DDC system registers that the new Lead Pump has started successfully, the DDC system shall stop the new Lag2 Pump. If the DDC system registers that the new Lead Pump has failed to start, the DDC system shall send an alarm message to the DDC system operator indicating a failed Pump and shall continue to run the new Lag1 Pump and the new Lag2 Pump.

• When the Lead/Lag1/Lag2/Lag3 Pump designations are switched with a call for 2 Tower Water Pumps to be running and the Lag2 Pump running in the place of the Lead Pump which is in the ALARM state, the DDC system shall continue to run the new Lag2 Pump and the new Lag3 Pump and shall start the new Lead Pump. If the DDC system registers that the new Lead Pump has started successfully, the DDC system shall continue to run the new Lag2 Pump to run in the place of the failed new Lag1 Pump, and shall stop the new Lag3 Pump. If the DDC system registers that the new Lead Pump has failed to start, the DDC system shall send an alarm message to the DDC system operator indicating a failed Pump and shall continue to run the new Lag2 and the new Lag3 Pumps.

• When the Lead/Lag1/Lag2/Lag3 Pump designations are switched with a call for 2 Tower Water Pumps to be running and the Lag2 Pump running in the place of the Lag1 Pump which is in the ALARM state, the DDC system shall continue to run the new Lag1 Pump and the new Lag3 Pump and shall start the new Lead Pump. If the DDC system registers that the new Lead Pump has started successfully, the DDC system shall stop the new Lag3 Pump. If the DDC system registers that the new Lead Pump has failed to start, the DDC system shall send an alarm message to the DDC system operator indicating a failed Pump and shall continue to run the new Lag1 and the new Lag3 Pumps.

• When the Lead/Lag1/Lag2/Lag3 Pump designations are switched with a call for 2 Tower Water Pumps to be running and 2 of the Tower Water Pump Normal/Alarm points in their ALARM states, the DDC system shall continue to run the operating Tower Water Pumps and shall not attempt to start either Tower Water Pump that is in the ALARM state.

• When the Lead/Lag1/Lag2/Lag3 Pump designations are switched with a call for 3 Tower Water Pumps to be running and all of the Tower Water Pump Normal/Alarm points in their NORMAL states, the DDC system shall continue to run the new Lag1 Pump, the new Lag2 Pump, the new Lag3 Pump, and shall start the new Lead Pump. If the DDC system registers that the new Lead Pump has started successfully, the DDC system shall stop the new Lag3 Pump. If the DDC system registers that the new Lead Pump has failed to start, the DDC system shall send an alarm message to the DDC system operator indicating a failed Pump and shall continue to run the new Lag1 Pump, the new Lag2 Pump, and the new Lag3 Pump.

• When the Lead/Lag1/Lag2/Lag3 Pump designations are switched with a call for 3 Tower Water Pumps to be running and 1 of the Tower Water Pump Normal/Alarm points in the

ALARM state, the DDC system shall continue to run the operating Tower Water Pumps and shall not attempt to start the Tower Water Pump that is in the ALARM state.

Local CHW Bypass Valve Control

The DDC system shall monitor a CHW Differential Pressure Sensor mounted on the CHW Piping near the AHU-4 System, and the status of each of the Primary CHW Pumps. When the DDC system registers that one of the Primary CHW Pumps is running, the DDC system shall begin to modulate the Local CHW System Bypass Valve to maintain a “Single Chiller Operation” Differential Pressure setpoint. When the DDC system registers that two or more of the Primary CHW Pumps are running, the DDC system shall begin to modulate the Local CHW System Bypass Valve to maintain a “Multiple Chiller Operation” Differential Pressure setpoint. When the DDC system registers that none of the Primary CHW Pumps are running, the DDC system shall control the Local CHW Bypass Valve to the 100% open position.

Cooling Towers System Control

The DDC system shall monitor the Common Chiller CDW Entering Temperature, and the status of each of the Tower Water Pumps. When the DDC system registers that none of the Tower Water Pumps are running, the DDC system shall disable the Cooling Tower Fans. When the DDC system registers that any one of the Tower Water Pumps is running, the DDC system shall determine whether the Cooling Tower Fans are required. The DDC system shall enable the Cooling Tower Fans when the Common Chillers CDW Entering Temperature has remained greater than the Common Chillers CDW Entering Temperature setpoint of 80 deg F (adj.) by 2 deg F (adjustable) for a continuous time period of 5 minutes (adjustable). The DDC system shall disable the Cooling Tower Fans when none of the Tower Water Pumps are running, or when the Common Chillers CDW Entering Temperature has remained less than the Common Chillers CDW Entering Temperature setpoint by 2 deg F (adjustable) for a continuous time period of 5 minutes (adjustable).

When the Cooling Tower Fans are enabled, the DDC system shall start all 3 of the Cooling Tower Fans. Each Cooling Tower Fan is equipped with a VFD which shall be set up to run at a Minimum Speed setting when the DDC system initially starts the VFD. The DDC system shall monitor the Run Status of each Fan via the Run Contacts in each VFD, and shall monitor the General Alarm Status of each Fan’s VFD. If the DDC system does not register a RUN status on a Cooling Tower’s Fan VFD after a 45 second delay (adjustable) from the start of the Fan, the DDC system shall continue to call for the Cooling Tower Fan to run, and send an alarm message to the DDC system operator.

When the DDC system registers that a Cooling Tower’s Fan is running, the DDC system shall modulate the Cooling Tower’s Fan together with the other operating Cooling Tower Fans to maintain the Common Chillers CDW Entering Temperature setpoint.

Cooling Tower Bypass Valve Control

The DDC system shall monitor the Common Chillers CDW Leaving Temperature, and the status of each of the Tower Water Pumps. When the DDC system registers that none of the Tower Water Pumps are running, the DDC system shall disable the Cooling Tower Bypass Valve and control the Cooling Tower Bypass Valve to the fully closed position. When the DDC system registers that any one of the Tower Water Pumps is running, the DDC system shall enable the Cooling Tower Bypass Valve to maintain a Common Chillers CDW Leaving Temperature setpoint of 75 deg F (adj.). When the Common Chillers CDW Leaving Temperature drops below the Common Chillers CDW Leaving Temperature setpoint, the DDC system shall begin to modulate the Cooling Towers Bypass Valve open. When the Common Chillers CDW Leaving Temperature rises above the Common Chillers CDW Leaving Temperature setpoint, the DDC system shall begin to modulate the Cooling Towers bypass Valve closed.

Condenser Water Tank Level Control The DDC system shall monitor the Level of Water in the Condenser Water Tank using a

Tank Level Sensor, and shall control the operation of the Condenser Water System Make-Up Water Valve. When the DDC system registers that the Level of Water in the Condenser Water Tank has dropped below 60” (adjustable), the DDC system shall open the Condenser Water Make-Up Valve. When the DDC system registers that the Level of Water in the Condenser Water Tank has risen above 72” (adjustable), the DDC system shall close the Condenser Water Make- Up Valve.

When the DDC system registers that the Level of Water in the Condenser Water Tank has dropped below 40”, the DDC system shall send an alarm message to the DDC system operator. When the DDC system registers that the Level of Water in the Condenser Water Tank has dropped below 30”, the DDC system shall disable the Chilled Water System.

Chiller Room Ventilation Control

The Chiller Room is served by 3 Supply Fans and 3 Exhaust Fans. The Chiller Room Envelope is served by the Exhaust Fan 2 System. The DDC system shall monitor the Chiller Room Space Temperature, the Chiller Room R-22 Refrigerant Monitor, the Chiller Room R-134a Refrigerant Monitor, and the control of the Chiller CH-3 System in order to control the operation of the Chiller Room Ventilation Fans. When any of the conditions detailed below is calling for a specific Fan to be running, the DDC system shall start the Fan. When none of the conditions detailed below is calling for a specific Fan to be running, the DDC system shall stop the Fan.

When the DDC system registers that the Chiller Room Temperature has risen above the Chiller Room Temperature setpoint of 85 deg F (adj.) by 2 deg F (adj.), the DDC system shall start Supply Fans SF-37, SF-38 and SF-39, and shall start Exhaust Fans EF-40, EF-41 and EF-42.

When the DDC system registers that the Chiller Room Temperature has dropped below the Chiller Room Temperature setpoint of 85 deg F (adj.) by 2 deg F (adj.), the DDC system shall stop Supply Fans SF-37, SF-38 and SF-39, and shall stop Exhaust Fans EF-40, EF-41 and EF-42.

When the DDC system registers that the R-134a Refrigerant Level has risen above the R- 134a Alarm setpoint by 50 PPM (adj.), the DDC system shall start Supply Fans SF-37 and SF-38, and shall start Exhaust Fans EF-40 and EF-41. When the DDC system registers that the R-134a Refrigerant Level has dropped below the R-134a Alarm setpoint by 50 PPM (adj.), the DDC system shall stop Supply Fans SF-37 and SF-38, and shall stop Exhaust Fans EF-40 and EF-41.

When the DDC system registers that the R-22 Refrigerant Level has risen above the R-22 Alarm setpoint by 50 PPM (adj.), the DDC system shall start Supply Fan SF-39, and shall start Exhaust Fan EF-42. When the DDC system registers that the R-22 Refrigerant Level has dropped below the R-22 Alarm setpoint by 50 PPM (adj.), the DDC system shall stop Supply Fan SF-39, and shall stop Exhaust Fan EF-42.

When the DDC system registers that the Building Operator is calling for the Chiller 3 System to run, the DDC system shall start Supply Fan SF-39 and Exhaust Fan EF-42, and shall disable the Exhaust Fan EF-2 System. When the DDC system registers that the Building Operator has disabled the Chiller 3 System, the DDC system shall stop Supply Fan SF-39 and Exhaust Fan EF-42, and shall disable the Exhaust Fan EF-2 System.

The DDC system shall monitor the Run Status of each Fan via a Current Switch in the Fan’s Motor Starter. If the DDC system does not register a RUN status on a Fan after a 30 second time delay (adj.) after an initial start, or if the DDC system registers a STOP status on a Fan during normal operation of the Fan, the DDC system shall send an alarm message to the DDC system operator and continue to operate the Fan using normal programming.

Chilled Water System Alarm and Message Notifications The DDC system shall monitor the Chilled Water System devices and shall send an alarm to the DDC system operator when any one of the associated Alarm Conditions is met:

• Chiller CH-1 System Alarm: The Chiller CH-1 System is in the ALARM state.

• Chiller CH-1 System Valve Alarm: The Isolation Valves on the Chiller CH-1 System are in the ALARM state.

• Chiller CH-2 System Alarm: The Chiller CH-2 System is in the ALARM state.

• Chiller CH-2 System Valve Alarm: The Isolation Valves on the Chiller CH-2 System are in the ALARM state.

• Chiller CH-3 Alarm: The Chiller’s Alarm contacts are indicating an Alarm Condition.

• Primary CHW Pump P-1 Run Status Alarm: The Pump is not running when the DDC system is calling for the Pump to run.

• Primary CHW Pump P-1 VFD Alarm: The VFD is indicating a General Alarm condition.

• Primary CHW Pump P-4 Run Status Alarm: The Pump is not running when the DDC system is calling for the Pump to run.

• Primary CHW Pump P-4 VFD Alarm: The VFD is indicating a General Alarm condition.

• Primary CHW Pump P-6 Run Status Alarm: The Pump is not running when the DDC system is calling for the Pump to run.

• Primary CHW Pump P-6 VFD Alarm: The VFD is indicating a General Alarm condition.

• Primary CHW Pump P-7 Run Status Alarm: The Pump is not running when the DDC system is calling for the Pump to run.

• Primary CHW Pump P-7 VFD Alarm: The VFD is indicating a General Alarm condition.

• Tower Water Pump P-2 Run Status Alarm: The Pump is not running when the DDC system is calling for the Pump to run.

• Tower Water Pump P-2 VFD Alarm: The VFD is indicating a General Alarm condition.

• Tower Water Pump P-3 Run Status Alarm: The Pump is not running when the DDC system is calling for the Pump to run.

• Tower Water Pump P-3 VFD Alarm: The VFD is indicating a General Alarm condition.

• Tower Water Pump P-5 Run Status Alarm: The Pump is not running when the DDC system is calling for the Pump to run.

• Tower Water Pump P-5 VFD Alarm: The VFD is indicating a General Alarm condition.

• Tower Water Pump P-8 Run Status Alarm: The Pump is not running when the DDC system is calling for the Pump to run.

• Tower Water Pump P-8 VFD Alarm: The VFD is indicating a General Alarm condition.

• R-22 Refrigerant Monitor Alarm: The R-22 Refrigerant Alarm PPM Signal is indicating a

High PPM Alarm.

• R-134a Refrigerant Monitor Alarm: The R-134a Refrigerant Monitor is indicating an Alarm condition.

• Cooling Tower #1 Fan Run Status Alarm: The Fan is not running when the DDC system is calling for the Fan to run.

• Cooling Tower #1 Fan VFD Alarm: The VFD is indicating a General Alarm condition.

• Cooling Tower #2 Fan Run Status Alarm: The Fan is not running when the DDC system is calling for the Fan to run.

• Cooling Tower #2 Fan VFD Alarm: The VFD is indicating a General Alarm condition.

• Cooling Tower #3 Fan Run Status Alarm: The Fan is not running when the DDC system is calling for the Fan to run.

• Cooling Tower #3 Fan VFD Alarm: The VFD is indicating a General Alarm condition.

• Condenser Water Tank Low Level Alarm: The Water Level in the Condenser Water Tank is less than 40”.

2010 Hot Water System

(As Built – 12/10)

Hot Water System Points List 1 Hot Water System Layout 1 Overall Hot Water System Control Strategy 1 Hot Water System Enable/Disable Control 2 Typical Boiler System Startup and Operating Control 2 – 3 Typical Boiler System Shutdown Control 3 Boilers B-1 and B-2 Individual Boiler Alarm Lockout Conditions 3 – 4 Boiler Systems Lead/Lag Control 4 Primary HW Pumps Control 5 – 6 Local HW Bypass Valve Control 6 Hot Water System Alarm and Message Notifications 6

Hot Water System:

The Hot Water System shall consist of (2) Boilers, (3) HW Pumps, and a local HW

System Bypass Valve. The DDC system shall control and monitor the following points associated with the Hot Water System:

INPUTS OUTPUTS

Boiler B-1 Alarm – DI Boiler B-1 S/S – DO Boiler B-1 HW Leaving Temp. – AI Boiler B-1 Modulating Signal – AO Boiler B-1 HW Iso. Valve Status – DI Boiler B-1 Iso. Valve O/C – DO Boiler B-2 Alarm – DI Boiler B-2 S/S – DO Boiler B-2 HW Leaving Temp. – AI Boiler B-2 Modulating Signal – AO Boiler B-2 HW Iso. Valve Status – DI Boiler B-2 Iso. Valve O/C – DO HW Pump P-12 Status – DI HW Pump P-12 S/S – DO HW Pump P-13 Status – DI HW Pump P-13 S/S – DO HW Pump P-14 Status – DI HW Pump P-14 S/S – DO Common HW Supply Temp. – AI Common HW Return Temp. – AI Remote HW Differential Pressure – AI HW System Bypass Valve – AO

Hot Water System Layout

The Hot Water System consists of (2) Boilers which are piped in parallel with one another. Each Boiler is equipped with a HW Isolation Valve. The Boilers are served by (3) Primary HW Pumps which are piped in parallel with one another. The Hot Water System is also equipped with a Local HW Bypass Valve which is modulated to maintain a Remote HW Differential Pressure setpoint.

Overall Hot Water System Control Strategy

The Hot Water System shall be enabled and disabled based on the Outdoor Air Temperature and a Time Schedule that is determined by the building operator. The DDC system shall monitor the Outdoor Air Temperature and shall modulate the Boilers to maintain an OA Reset Hot Water Supply Temperature setpoint using the following Reset Schedule:

Outdoor Air Temperature HW Supply Temp. Setpoint 0 Deg F (adj.) 190 Deg F (adj.)

60 Deg F (adj.) 155 Deg F (adj.)

Boilers B-1 and B-2 shall be controlled using Lead/Lag logic with the Lead Boiler used as the Primary Boiler and the Lag Boiler used as the Stand-By Boiler. When the Hot Water System is initially enabled, the Lead Boiler System shall be enabled and the DDC system shall modulate the Lead Boiler to maintain the HW Supply Temperature setpoint. If the Lead Boiler System goes to an ALARM condition, the DDC system shall disable the Lead Boiler System, enable the Lag Boiler System, and modulate the Lag Boiler to maintain the HW Supply Temperature setpoint. When the Hot Water System is disabled, the DDC system shall disable both the Lead and Lag Boiler Systems.

Hot Water System Enable/Disable Control The Hot Water System shall be enabled and disabled based on the Outdoor Air Temperature and a Time Schedule that is determined by the building operator using the following logic:

• When the Outdoor Air Temperature is less than 25 deg F (adj.), the DDC system shall run the

Hot Water System continuously regardless of the Hot Water System Time Schedule.

• When the Outdoor Air Temperature is greater than 25 deg F (adj.) and less than 50 deg F

(adj.), the DDC system shall enable the Hot Water System when the Hot Water System Time Schedule is calling for the Hot Water System to run, and shall disable the Hot Water System when the Hot Water System Time Schedule is calling for the Hot Water System to be disabled.

• When the Outdoor Air Temperature is greater than 50 deg F (adj.), the DDC system shall keep the Hot Water System disabled.

Typical Boiler System Startup and Operating Control

Boiler. The DDC system shall follow the following routine when a Boiler System is enabled as detailed in the Overall Hot Water System Control Strategy:

1) Ensure that the Boiler is available for operation. The DDC system will lock out a Boiler due to various Boiler Alarm conditions.