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LCBS CONNECT SOLUTION

31-00118EFS—01

34

6. Two Heat Two Cool Integrated Economizer Differential Enthalpy 
Changeover and Temperature Limit

BUILDING NAME

CVAHU RTU NAME

DATE

COOL 2

HEAT 1

HEAT 2

FAN

COO

COOL 1

TWO HEAT TWO COOL INTEGRATED ECONOMIZER DIFFERENTIAL ENTHALPY

MCR36713

C7250A

MA SENSOR

C7250A

DA SENSOR

M7215A

ECONOMIZER

ACTUATOR 

ACTUATOR

24 VAC POWER

HVAC SYSTEM

24 VAC POWER

EXISTING

TRANSFORMER 

C7250A

MIXED AIR SENSOR

C7250A

OUTDOOR AIR SENSOR

C7250A

DISCHARGE AIR SENSOR

M7215A

ECONOMIZER ACTUATOR

AT40A

TRANSFORMER (SIZE APPROPRIATELY)

THIS APPLICATION PROVIDES AUTOMATIC CONTROL OF TWO STAGES OF GAS OR ELECTIR HEAT, TWO

STAGES OF DIRECT EXPANSION COOLING, AND INTEGRATED ECONOMIZER WITH DIFFERENTIAL ENTHALPY 

CONTROL AND HIGH TEMPERATURE LIMIT (SEE APP GUIDE FOR HIGH LIMIT (SEE APP GUIDE FOR DETAILED 

SEQUENCE).  CONFIGURER HAS THE ABILITY TO SET UP SETBACK, SETUP FEATURES THAT WILL ENABLE 

BUILDING OWNER TO ACHIEVE ENERGY SAVINGS BY REDUCING EQUIPMENT OPERATION DURING 

UNOCCUPIED PERIODS.  ADAPTIVE INTELLIGENT RECOVERY IS ALSO A STANDARD FEATURE.  IT PERMITS 

CONTROLLED OPERATIONAL TRANSITION OF HEATING AND COOLING EQUIPMENT FROM UNOCCUPIED TO 

OCCUPIED TO 1] GUARD AGAINST EQUIPMENT OVERUSE AND 2] HELP CONTROL POTENTIAL ELECTRICAL 

SPIKES RESULTING IN DEMAND CONTROL UTILITY CHARGES.  SYSTEM SUPPLY FAN AUTOMATICALLY 

OPERATES IN A CONTINUOUS MANNER DURING OCCUPIED PERIODS AND CYCLES ON A CALL FOR HEATING 

OR COOLING DURING UNOCCUIPED PERIODS TO MEET THE NEED OF PREVAILING BUILDING CODES.               

LCBS CONNECT – INFORMATION

OS#

DESCRIPTION

YCRL6438SR LCBS CONTROLLER (WITH WALL MODULE)

LCBS CONNECT – COMPONENTS SHOWN

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

24VAC CO

M

24VDC

24VAC

R

W1

W2

W

3 O

B 

G-L

Y1

Y2

Y3

 G-L

RH

RC

CO

M

 AU

X

DO

1 AUX

G

UI-1

DI-2

DI-3

UI-4

UI-5

UI-6

UI-2

UI-3

COM

COM

COM

DI-4

DI-1

COM

AO-3

AO-1

COM

A0-2

COM

NET-1

NET-2

S-BUS

S-BUS

SHIELD

EGND

LCBS

CONTROLLER

SYLK BUS

24 VAC

CONTROLLER

POWER

LCBS

CONTROLLER

WALL

MODULE

C7400S SYLK OUTSIDE AIR

ENTHALPY SENSOR 
C7400S SYLK RETURN AIR

ENTHALPY SENSOR 

Summary of Contents for LCBS Connect

Page 1: ... General Economizer Operation 9 Honeywell Integrated Economizer Control Described 10 Honeywell Integrated Economizer Control Climate Zones 12 Honeywell Integrated Economizer Control High Limit and Changeover Strategies 12 Strategy 1 Differential Enthalpy with Fixed Dry Bulb Temperature Limit 12 Strategy 2 Outdoor Air Enthalpy 12 Strategy 3 Differential Temperature 12 Strategy 4 Outdoor Temperature...

Page 2: ... Gateway that permits controller data to be sent from individual CHAHU controllers via the internet to the new LCBS Connect Cloud The new Honeywell Cloud capability gives our control system users unprecedented access to data remotely via standard smart phones tablets and personal computers Honeywell also performs data analysis called analytics that will permit service contractors and building owne...

Page 3: ...entilation cycles that have ceased to function air flow systems improperly sized delivering substandard air flow and thermostats in common buildings that fight each other due to improper occupant intervention LCBS Connect Extending HVAC Equipment Life The average estimated life of packaged constant volume air handling systems is about 17 25 years depending on where the system is located At eight 8...

Page 4: ... work LCBS Connect allows HVAC service contractor and customers to develop schedules via LCBS Connect tools including local operator interface or remote cloud based tool to match building occupancy schedules These schedules can be also be set to accommodate occurrence of special events and holidays To ensure that proper comfort conditions are achieved by desired occupancy Honeywell has developed a...

Page 5: ...tice is observed Tip Use standby set points in infrequently occupied building zones including meeting rooms and break rooms Available This is a fourth condition indicating that a change of event state can be programmed configured exe cuted This is also referred to as un configured How it works Date and Time is available for each LCBS Connect controller Each LCBS controller can support for events F...

Page 6: ...r heating directly or the supply fan can be controlled by a fan and limit device The latter is quite common with gas heating systems We support control of three stages of heat three stages of cool Further electric heat can typically be cycled more frequently and aggressively than gas heat LCBS Connect accounts for both methods and all settings Air to Air Heat Pump In North America there are areas ...

Page 7: ...arge air temperature to the set point Let s assume that the discharge air set point is 120 F If the discharge air temperature increases above 120 F then the heating equipment is cycled off When it falls back below the limit minus the switching differential it will be allowed to cycle back on Please note Your HVAC unit will feature a high limit heating control Ensure that the LCBS Connect setting i...

Page 8: ...ling and heating can be programmed to operate in a reheat sequence to provide precise dehumidification operation Second dehumidification equipment can be controlled through a direct LCBS Connect output to provide dehumidification Third extended cooling extended runtime can be selected that can enhance and augment the dehumidification process These are described in detail below Method 1 Cooling On ...

Page 9: ...90 1 2010 Section 6 5 1 or to your local building code for ventilation and economizer codes This choice would also be used for systems that aren t connected to a fresh air ventilation function like many commercial split systems Enable Economizer Function Second there are hundreds of thousands of economizers that are controlled by a stand alone collection of economizer controls typically provided b...

Page 10: ...al output can be used to carry 24 VAC to a packaged economizer system By definition during building unoccupied schedule the contact is open disabling the economizer This typically allows a spring return actuator to close to 100 position NOTICE Opportunity to upgrade your customer s system and provide trusted advisor service Using the integrated techniques described above you will be able to 1 impr...

Page 11: ...ng range Over 8M of the control systems we ve provided to the HVAC industry have these set points hard coded in the devices with literally no complaints callbacks or service interventions Fig 3 Pacific Northwest National Laboratory Oak Ridge National Laboratory August 2010 http www1 eere energy gov buildings publications pdfs building_america ba_climateguide_7_1 pdf Table 2 When the mixed air cont...

Page 12: ...with all economizer limit and changeover strategies LCBS Connect remote services alerting and analytics can help you fine tune setting to maximize customer energy savings and maintain comfort There is an ASHRAE prescriptive value suggestion at 28 LB BTU changeover Many folks find this a bit warm and could result in customer client comfort issues How does it work If there is a call for cooling and ...

Page 13: ...ted to the LCBS controller If the freeze stat is configured and the LCBS Connect controller input is closed the CVAHU system will be shut down The freeze stat function can also be used to shut down the CVAHU system for smoke or fire alert alarm Economizer Control Summary LCBS Connect controllers feature an ASHRAE Complete range of economizer control changeover and high limit options If you are att...

Page 14: ...plication the response time to the equipment being controlled and the control algorithm being used The narrower smaller the throttling range the more precise the control and the wider larger the throttling range the more stable the control The objective is setting the throttling range to achieve the optimum balance between precision and stability Set point and Differential Refresher On Off Digital...

Page 15: ...ve and will continue to increase as long as the proportional error is greater than 0 The increase in the output signal will drive the controlled device further open and the controlled medium will be brought closer to set point While the proportional error is reduced the integral error will continue to increase until the proportional error is eliminated PROPORTIONAL ON OFF CONTROL HEATING REVERSE A...

Page 16: ...For example if you want to control outdoor lights the integration feature doesn t add to the quality of control and the integration timer should be set to zero 0 Simple set point and differential are the only parameters that need to be set Do You Want to Know More about Integral Control As a starting point the LCBS Connect controller uses the dependent gains form of the PID equation This means tha...

Page 17: ...t the primary function of human respiration is to obtain oxygen for use by body s cells and eliminate carbon dioxide that cells produce The less content of carbon dioxide in the air the less presence of human respiration and humans exists This makes people drowsy ill and worse Find levels and associated human impact of CO2 in confined building spaces provided by Engineering Tool Box Source http ww...

Page 18: ...building space Our automatic control system begins to reset minimum ventilation rates from our minimum ventilation damper position level to our minimum DCV ventilation damper position This reset will dynamically continue based on sensed carbon dioxide PPM level in the space Demand Controlled Ventilation Summary LCBS Connect controllers can provide mitigation strategy based on the increase of CO2 a...

Page 19: ...F out side air temperature and a recovery of 8 F per hour at 55 F The minimum recovery rate is 3 F per hour and the maximum recovery rate is 8 F per hour Adaptive Intelligent Recovery Summary You will need to understand how your equipment is sized in relationship to heating and cooling load in the middle of summer and winter and during transitional climate season It is absolutely essential that yo...

Page 20: ... can control The motor will have two sets of windings this motor is typically provided by an HVAC OEM or by a motor supplier directly One set is energized for one discrete speed and the other set energized for the second discrete speed If you encounter a motor like this it is already wired to control the two discrete speeds with LCBS Connect controller Again note that the speeds are probably uncha...

Page 21: ...own above do NOT use the two fan speed logic provided by LCBS controller Two Speed and Multispeed VFD Application The LCBS Controller sends a control signal 0 10 VDC to a VFD that changes frequency and the speed of the supply fan motor NOTES 1 Consult with VFD manufacturer to ensure that the supply fan motor in your constant volume air handling unit is able to be controlled by the VFD As time goes...

Page 22: ...of heat and ventilation mode at the same low rate 40 I want to reduce fan speed during first stage cool to 60 I want the fan to run at 80 for multistage heat and cool HVAC modes Please refer to the diagram below to describe how we want the system supply fan will work Fig 10 Following the diagram from left to right just above and to the left note that if there is a call for unoccupied heat the fan ...

Page 23: ...ume that a heating blower coil is in a loading dock and that the dock is open from 6 AM in the morning to midnight Because this is a heating blower coil our primary requirements during occupancy would be 1 the comfort of the loading dock employees and 2 good even temperature control During unoccupied times from midnight to 6 AM out primary requirement is keeping pipes product and equipment from fr...

Page 24: ...ameters you want to implement Go to LCBS Connect wall module or LCBS Connect Remote User Interface and input desired values It is absolutely essential that you understand concepts that are presented above so that you can commission an effective accessory loop strategy SERVICE ALERTING THEORY AND FUNDAMENTALS As fuel costs have increased in the last half of the 20th Century and the first part of th...

Page 25: ...nal load zone demand of 130 min 162 or lower indicates that mechanical or electric heating is not matching zone building heat exchange demand Your story You have a maintenance contract with your customer to monitor heating and cooling efficiency If you receive and alert for 120 for cooling or 120 for heating you are beginning to lose capacity for some reason This could be a result of heat exchange...

Page 26: ...ll below 600 PPM the timer is reset You can further create a custom message and make sure that your best service technician gets a custom e mail message and an SMS message indicating that a CO2 level alert has occurred Again you can further create a custom message and make sure that your best service technician gets a custom e mail message and an SMS message By definition this technician will be p...

Page 27: ...DIGITAL FLOW SWITCH THAT MEASURES ENTERING AND LEAVING AIR ACROSS THE SUPPLY FAN FREEZE STAT INDICATES THE STATE OF THE FREEZE STAT DIGITAL INPUT ALSO CALLED COIL FREEZE IF THIS CONDITION IS DETECTED LCBS CONTROLLER LOGIC WILL SHUT OFF SUPPLY FAN USER CONFIGURED INPUT MONITOR SWITCH INDICATES THE STATE OF THE MONITOR SWITCH DIGITAL INPUT UP TO CONFIGURER S IMAGINATION AND ALERTING REQUIREMENTS RET...

Page 28: ...E FILTER WHEN THE INPUT UI5 IS CONFIGURED TO MEASURE FILTER PRESSURE THIS INPUT CAN BE USED TO MONITOR AND MEASURE FILTER STATIC FILTER LOAD LIMIT CAN BE SET TO INDICATE WITH FILTER USE BECOMES INEFFECTIVE MIXED AIR TEMPERATURE MIXED AIR TEMPERATURE IS A USEFUL ALERTING POINT TO SERVICE ECONOMIZER USE THIS SENSOR IS ALSO ENTERING SYSTEM TEMPERATURE AND IS NECESSARY FOR MOST UPCOMING HEATING AND CO...

Page 29: ...CE HUMIDITY SYLK ADDRESS 3 TEMPERATURE TEMPERATURE MEASURED BY TR40 REMOTE WALL MODULE AT SYLK BUS ADDRESS 3 SAME BENEFITS AS SPACE TEMPERATURE SYLK ADDRESS 4 TEMPERATURE TEMPERATURE MEASURED BY TR40 REMOTE WALL MODULE AT SYLK BUS ADDRESS 4 SYLK ADDRESS 5 TEMPERATURE TEMPERATURE MEASURED BY TR40 REMOTE WALL MODULE AT SYLK BUS ADDRESS 5 SYLK ADDRESS 6 TEMPERATURE TEMPERATURE MEASURED BY TR40 REMOTE...

Page 30: ...TS LIST THOSE IN RED ARE FIXED TO SINGLE INPUT OR OUTPUT DEFINITION I O NAME OF INPUT OUTPUT POINT S MCR36706 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 24VAC COM 24VDC 24VAC R W1 W2 W3 OB G L Y1 Y2 Y3 G L RH RC COM AUX DO1 AUX G UI 1 DI 2 DI 3 UI 4 UI 5 UI 6 UI 2 UI 3 COM COM COM DI 4 DI 1 COM AO 3 AO 1 COM A0 2 COM NET 1 NET 2 S...

Page 31: ...SSORY LOOP STAGE ACCESSORY LOOP AUX CONTROL POINT MCR36708 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 24VAC COM 24VDC 24VAC R W1 W2 W3 OB G L Y1 Y2 Y3 G L RH RC COM AUX DO1 AUX G UI 1 DI 2 DI 3 UI 4 UI 5 UI 6 UI 2 UI 3 COM COM COM DI 4 DI 1 COM AO 3 AO 1 COM A0 2 COM NET 1 NET 2 S BUS S BUS SHIELD EGND LCBS CONTROLLER LCBS CONNECT...

Page 32: ...1 32 33 34 35 36 37 38 39 40 24VAC COM 24VDC 24VAC R W1 W2 W3 OB G L Y1 Y2 Y3 G L RH RC COM AUX DO1 AUX G UI 1 DI 2 DI 3 UI 4 UI 5 UI 6 UI 2 UI 3 COM COM COM DI 4 DI 1 COM AO 3 AO 1 COM A0 2 COM NET 1 NET 2 S BUS S BUS SHIELD EGND LCBS CONTROLLER SYLK BUS 24 VAC CONTROLLER POWER LCBS CONTROLLER WALL MODULE C7250A MA SENSOR C7250A DA SENSOR HVAC SYSTEM 24 VAC POWER EXISTING TRANSFORMER LCBS CONNECT...

Page 33: ...ERMITS CONTROLLED OPERATIONAL TRANSITION OF HEATINGAND COOLING EQUIPMENT FROM UNOCCUPIED TO OCCUPIED TO 1 GUARD AGAINST EQUIPMENT OVERUSE AND 2 HELP CONTROL POTENTIAL ELECTRICAL SPIKES RESULTING IN DEMAND CONTROL UTILITY CHARGES SYSTEM SUPPLY FAN AUTOMATICALLY OPERATES IN A CONTINUOUS MANNER DURING OCCUPIED PERIODS AND CYCLES ON A CALL FOR HEATING OR COOLING DURING UNOCCUIPED PERIODS TO MEET THE N...

Page 34: ...GS BY REDUCING EQUIPMENT OPERATION DURING UNOCCUPIED PERIODS ADAPTIVE INTELLIGENT RECOVERY IS ALSO A STANDARD FEATURE IT PERMITS CONTROLLED OPERATIONAL TRANSITION OF HEATING AND COOLING EQUIPMENT FROM UNOCCUPIED TO OCCUPIED TO 1 GUARD AGAINST EQUIPMENT OVERUSE AND 2 HELP CONTROL POTENTIAL ELECTRICAL SPIKES RESULTING IN DEMAND CONTROL UTILITY CHARGES SYSTEM SUPPLY FAN AUTOMATICALLY OPERATES IN A CO...

Page 35: ...NDOOR AIR QUALITY ISSUE SEE APP GUIDE FOR DETAILED SEQUENCE SETBACK AND ADAPTIVE INTELLIGENT RECOVERY WORKS PER APPLICATION GUIDE SYSTEM SUPPLY FAN AUTOMATICALLY OPERATES IN A CONTINUOUS MANNER DURING OCCUPIED PERIODS AND CYCLES ON A CALL FOR HEATING OR COOLING DURING UNOCCUIPED PERIODS TO MEET THE NEED OF PREVAILING BUILDING CODES LCBS CONNECT INFORMATION OS DESCRIPTION YCRL6438SR LCBS CONTROLLER...

Page 36: ...IAL ENTHALPY CONTROL AND HIGH TEMPERATURE LIMIT SEE APP GUIDE FOR DETAILED SEQUENCE CONFIGURER HAS THE ABILITY TO SET UP SETBACK SETUP FEATURES THAT WILL ENABLE BUILDING OWNER TO ACHIEVE ENERGY SAVINGS BY REDUCING FAN AND COOLING EQUIPMENT OPERATION DURING UNOCCUPIED PERIODS ADAPTIVE INTELLIGENT RECOVERY IS ALSO A STANDARD FEATURE IT PERMITS CONTROLLED OPERATIONAL TRANSITION OF COOLING EQUIPMENT F...

Page 37: ...WILL OPERATE THE HEAT PUMP AUXILIARY HEAT BASED ON CONFIGURER SELECTED HEATING SETPOINT IN THE SAVINGS MODE THE HEATING SETPOINT IS DEPRESSED SO THAT ELECTRIC AUXILIARY HEAT OPERATES LESS FREQUENTLY REFER TO APPLICATION GUIDE TO REFERENCE SETUP SETBACK OPERATION AS WELL AS ADAPTIVE INTELLIGENT RECOVERY OPERATION SYSTEM SUPPLY FAN AUTOMATICALLY OPERATES IN A CONTINUOUS MANNER DURING OCCUPIED PERIOD...

Page 38: ... THE HEATING SETPOINT IS DEPRESSED SO THAT ELECTRIC AUXILIARY HEAT OPERATES LESS FREQUENTLY REFER TO APPLICATION GUIDE TO REFERENCE SETUP SETBACK OPERATION AS WELL AS ADAPTIVE INTELLIGENT RECOVERY OPERATION SYSTEM SUPPLY FAN AUTOMATICALLY OPERATES IN A CONTINUOUS MANNER DURING OCCUPIED PERIODS AND CYCLES ON A CALL FOR COOLING DURING UNOCCUIPED PERIODS TO MEET THE NEED OF PREVAILING BUILDING CODES ...

Page 39: ...COOLING CONTINUES TO OPERATE BASED ON COOLING SETPOINT SECOND AN LCBS CONNECT CONTROLLER OUTPUT CAN BE PROGRAMMED TO CONTROL A DEHUMIDIFICATION UNIT LIKE A DX DEHUMIFIER OR DESSICANT SYSTEM IF A CALL FOR DEHUMIDIFICATION EXISTS THE SELECTED SYSTEM OPERATES INDEPENDENTALY OF LCBS CONTROL FUNCTIONS THE CONFIGURER CAN ALSO SET A RUN ON TIMER THAT OPERATES AFTER THE CALL FOR DEHUMIFICATION ABATES UP T...

Page 40: ...EQUIPMENT FROM UNOCCUPIED TO OCCUPIED TO 1 GUARD AGAINST EQUIPMENT OVERUSE AND 2 HELP CONTROL POTENTIAL ELECTRICAL SPIKES RESULTING IN DEMAND CONTROL UTILITY CHARGES MULTISPEED FAN OPTION PERMITS CUSTOMIZED CONTROL OF FAN SPEED AND CAN BE INDEXED TO SPECIFIC MODES THERE ARE TWO DISCRETE MODES LOW FAN REGULARY FAN THAT CAN BE COUPLED WITH MULTIPLE CONTROL MODES SUCCESSFULLY IMPLMEMENTED ENERGY COST...

Page 41: ...UP FOR THE PRIMARLY CVAHU ROOFTOP UNIT SPLIT SYSTEM REFER TO APPLICATION NARRATIVE FOR FURTHER INFORMATION ABOUT SET UP AND OPERATION NOTE ZERO OUT INTEGRAL TIMING FOR LOOP TO WORK CORRECTLY FOLLOW SENSOR PROVIDERS INSTALLATION MATERIAL FOR GUIDEANCE TO SET PROPORPORTIONAL THROTTLING RANGE LCBS CONNECT INFORMATION OS DESCRIPTION YCRL6438SR LCBS CONTROLLER WITH WALL MODULE LCBS CONNECT COMPONENTS S...

Page 42: ...IOXIDE SENSOR C7400S OUTSIDE AIR ENTHALPY SENSOR C7400S RETURN AIR ENTHALPY SENSOR POLARITY INSENSITIVE TR40 SPACE SENSOR POLARITY INSENSITIVE TR40 SPACE SENSOR TR40 SPACE SENSOR TR40 SPACE SENSOR SYLK BUS 24 VAC CONTROLLER POWER LCBS CONTROLLER WALL MODULE RULES APPLY DEVICES WITH UP TO FOUR POWER UNITS ON SYLK BUS POWER UNITS TR40 SPACE TEMPERATURE SENSOR ONE 1 POWER UNIT TR40 H CO2 TEMPERATURE ...

Page 43: ...LCBS CONNECT SOLUTION 43 31 00118EFS 01 ...

Page 44: ...EFS 01 M S 02 17 Printed in United States By using this Honeywell literature you agree that Honeywell will have no liability for any damages arising out of your use or modification to the literature You will defend and indemnify Honeywell its affiliates and subsidiaries from and against any liability cost or damages including attorneys fees arising out of or resulting from any modification to the ...

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