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Discharge Air Controller (DAC) Manual

Software Overview • 19

7.5.1. CAV Mode

The indoor fan will be controlled in one of three

ways:

• Continuous – The fan is always on, even when the

controller is not in heating, cooling, or

dehumidification mode. In variable speed fan

control, when heating or cooling is not active, the
fan will be ON at a fixed, user-defined idle speed.

• Auto – The fan is only on when the controller is in

heating, cooling, dehumidification, or outside air

damper operation mode.

• Summer ON, Winter Auto (SOWA) – This mode

allows the fan to operate in Continuous mode during

the summer months and in Auto mode during the

winter months (based on the season passed to the
DAC from the E2 controller).

If desired, activation and deactivation delays may

be set up for the DAC application for both heating and

cooling mode.

7.5.1.1.

Variable-Speed Fan Control in

CAV

When using a variable-speed fan, each heat and

cool stage has its own individual VS fan speed

setpoint. When one or more stages are active, the

DAC will look at the setpoints of all active stages and

operate the VS fan at the highest setpoint value.

Example: A DAC is controlling two heat stages.

Heat stage #1’s VS fan setpoint is 50%, and Heat

stage #2’s VS fan setpoint is 100%. When heating

mode first begins and the heat stage #1 becomes

ACTIVE, the fan will increase speed from idle to

50%. When heat stage #2 is activated for more

heating, the DAC looks at both heat stage #1 and #2’s

setpoints, determines that the highest setpoint belongs

to stage #2 (100%), and increases the fan speed to

100%.

7.5.1.1.1.

Economization VS Fan Speed

Because the controller treats economization

separately from mechanical cooling, the

economization damper has its own fan speed setpoint.

When economization is enabled and no other cooling

stages are active, the VS fan will operate at the

economization fan speed setpoint.

7.5.1.1.2.

CO2 Purge VS Fan Speed

When a CO2 purge is active and heating and cool-

ing are not active, the DAC will operate the VS fan at

the CO2 Purge VS Fan Speed setpoint.

7.5.1.1.3.

Make-up Air Offset VS Fan Speed

When make-up air is active, the current VS fan

speed will be increased by the Make-up Air Offset%

setpoint.

7.5.1.1.4.

Idle VS Fan Speed

When using the “Continuous” fan mode, the DAC

will use the Idle VS Fan Speed setpoint when no

cooling or heating stages are active.

7.5.1.1.5.

Dehumidification Offset

During dehumidification, a lower VS fan speed is

typically desired. The DAC uses a dehumidification

offset parameter to achieve this. When an offset

greater that 0% is specified in the DAC, the offset is

subtracted from the final VS fan speed when

dehumidification is active.

For example, if the dehumidification offset is 5%,

and cool stage 1’s VS fan speed setpoint is 50%, when

dehumidification is active with one cooling stage ON,

the VS fan speed will be adjusted down to 45% (50%

- 5%). If a second cool stage with a setpoint of 100%

were to turn ON, the VS fan speed would increase to

95% (100% - 5%).

7.5.1.1.6.

VAV Mode

For VAV applications, the supply duct static

pressure must be controlled to avoid over

pressurization of the ductwork. The DAC can support

control of the duct static pressure using either a

variable speed fan or a single speed fan in conjunction

with a bypass damper.

7.5.1.2.

Single Speed with Bypass

Damper

The single speed fan will activate as described in

Section 7.5.1.,

CAV Mode

. When the fan is active, the

duct static pressure will be controlled using a

modulating bypass damper. When the bypass damper

is at 0%, it is considered fully closed, meaning no

supply air is bypassed to the return. As the static

pressure in the duct rises above the static pressure

setpoint, the bypass damper will begin to open based

on the output from a PID loop (direct acting), thus

relieving the pressure in the duct.

7.5.1.3.

Variable-Speed Fan Control in

VAV

The variable-speed fan will activate as described

Section 7.5.1.,

CAV Mode

Once active, the speed

of the fan will modulate to maintain the duct pressure

setpoint. As the static pressure falls below the

Содержание iPro.Genius

Страница 1: ...Discharge Air Controller DAC Installation and Operational Manual FW Version 1 04F05 026 1727 Rev 3 ...

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Страница 3: ...Emerson 1065 Big Shanty Road NW Suite 100 Kennesaw GA 30144 770 425 2724 www emerson com ...

Страница 4: ......

Страница 5: ... INPUTS 6 4 1 1 Wiring Analog Inputs on the DAC 7 4 1 2 Wiring Digital Inputs on the DAC 8 4 2 THE DAC OUTPUTS 10 4 2 1 Wiring Digital Loads on the DAC 10 4 2 2 Wiring Analog Outputs on the DAC 11 5 WIRING CONNECTION TO SITE SUPERVISOR 13 6 DAC STATUS LEDS 14 6 1 PWR ON LED 14 6 2 TX AND RX LEDS 14 6 3 LED1 NETWORK STATUS 14 6 4 ALARM LED STATUS 14 7 SOFTWARE OVERVIEW 15 7 1 APPLICATION MODE 15 7 ...

Страница 6: ...Air Control 22 7 7 3 Economizer Control 22 7 7 3 1 Operation of Two Position Dampers During Economization 22 7 7 3 2 Operation of Variable Position Dampers During Economization 22 7 7 3 3 Economization Enabling Strategy 23 7 7 4 Smoke Detection 23 7 7 5 Priority When Economization CO2 Control and Make up Air are Used Together 23 7 7 6 Return Damper Control 23 7 8 6 10 REVERSING VALVE CONTROL 24 7 ...

Страница 7: ...puts 38 10 2 2 Relay Outputs 39 10 2 3 Analog Outputs 39 10 2 4 Digital Inputs 39 10 3 RELAY OUTPUT OVERRIDES WITH VISOGRAPH 39 10 3 1 Analog Output Overrides with Visograph 40 10 3 1 1 To Override an Analog Output 40 10 3 1 2 To Clear an Analog Output Override 40 INDEX 43 ...

Страница 8: ......

Страница 9: ...Points The compact size of the DAC allows technicians to field mount the DAC in a rooftop unit or enclosure close to it allowing for local connection of sensors and transducers The board has 10 analog inputs and 20 digital inputs with default configurations pre loaded for quick connection to space temperature sensors supply and return air temperature sensors and fan proofs Its 15 relay outputs rat...

Страница 10: ...l of a package unit is acceptable If there is no room to mount the controller inside the HVAC unit it may be mounted inside a weatherproof enclosure on the outside of the unit 2 1 Installation The DAC uses a DIN mount installation 2 2 Powering the DAC Retail Solutions supplies a wide variety of 24VAC transformers with varying sizes without center taps Table 2 2 shows the transformer sizes and are ...

Страница 11: ... left disconnected if present on the transformer The wire length from the transformer determines the type wire gauge used In most cases the distance between the DAC and the transformer that supplies power to it is not enough to be of concern however it is very important NOT to exceed this maximum wire length or the controller will not operate correctly Use these formulas to determine if the wire g...

Страница 12: ...n 82761 and Belden 88761 for plenum installations If the recommended cable is not available in your area be sure the wiring meets or exceeds the following specs 3 1 1 Daisy Chains Connect the MODBUS network cable to the three terminal connector on the E2 COM port you wish to assign as MODBUS Reverse the polarity of on the RS485 cable between the E2 and the DAC Shielded Yes Conductor Type Twisted P...

Страница 13: ...d application version see Figure 3 4 Press corresponding button along the bottom T1 T6 to navigate to desired item 3 1 2 3 Setting the MODBUS Address Boards of the same type are typically numbered in sequence starting with one and continuing with two three and so forth 1 Press 5 Controller Info on the main menu to see Controller Info screen The first field highlighted by the cursor is the Modbus A...

Страница 14: ...he MODBUS network the termination jumper should be applied 4 Input and Output Setup 4 1 The DAC Inputs The DAC will be able to use input data from either physical or network inputs The DAC has connections to analog and digital sensors transducers switches and other input types typically used in a rooftop HVAC unit application The input type and function for each point must be programmed in the DAC...

Страница 15: ...Compressors Supply Temp Local Local Supply Air Temperature mandatory sensor required for control Zone Temp Network DAC only Network Space Temperature Auxiliary 2 Local Satellite Inputs used by E2 NOTE The Digital Inputs of the DAC are pre defined and cannot be changed Digital Input Point Number Description Fan Proof 1 Local Fan Proof Sensor Smoke Detector 2 Local Smoke Detector Dirty Filter 3 Loca...

Страница 16: ...y inputs that are powered with a voltage that differs from that supplied by the DAC 12V or 5V must be powered separately with another transformer in order to prevent the inputs from malfunctioning or being damaged Do not use the same secondary of the controller s power to power the sensors Terminal Number on Connector Name 1 24VAC Supply 2 Probe Input 1 Table 4 3 Analog Input Connector Terminal Nu...

Страница 17: ...al Input 9 49 Digital Input 10 50 51 Digital Input 11 unsupported 52 Digital Input 12 unsupported 53 Digital Input 13 unsupported 54 Digital Input 1 unsupported 55 Digital Input 15 unsupported Table 4 4 Digital Input Connector Terminal Numbers 56 Digital Input 16 unsupported 57 Digital Input 17 unsupported 58 Digital Input 18 unsupported 59 Digital Input 19 unsupported 60 Digital Input 20 unsuppor...

Страница 18: ...4 Cool Stage Output Dehumidifier Digital Dehumidification Active Econ Enable Economization Enabled Fan Enable Fan Enable Primary Heat Stage 1 2 Primary Heat Stage Output Secondary Heat Stage 1 2 Secondary Heat Stage Out put Reversing Valve Heat Pump Reversing Valve Output Auxiliary 2 Satellite Outputs Controlled by E2 Reheat Reheat Output Table 4 5 DAC Relay Outputs Analog Outputs Relay Outputs An...

Страница 19: ...be used to supply power to terminals 28 and 29 Figure 4 11 Relay Output Wiring Terminal Number on Connector Name 70 Relay 1 71 Common for Relays 1 3 72 Relay 2 73 Relay 3 76 Relay 4 77 Relay 5 78 Relay 6 79 Relay 7 80 Common for Relays 4 8 81 Relay 8 84 Relay 9 85 Relay 10 86 Common for Relays 9 10 87 Relay 11 88 Relay 12 89 Relay 13 90 Common for Relays 11 15 91 Relay 14 92 Relay 15 93 Table 4 7 ...

Страница 20: ...utputs 026 1727 Rev 3 24 Analog Output 4 25 Analog Out Common 26 Analog Output 5 27 Analog Output 6 28 24VAC or 24VDC 29 24VAC or 24VDC 30 Analog Out Common Table 4 8 Digital Relay Output Connector Terminal Numbers ...

Страница 21: ...Discharge Air Controller DAC Manual Wiring Connection to Site Supervisor 13 5 Wiring Connection to Site Supervisor Figure 5 1 Site Supervisor Wiring ...

Страница 22: ...r you should see these lights blinking regularly If they do not blink regularly there may be a problem with the network 6 3 LED1 Network Status The amber colored LED1 indicates whether the DAC is online or offline with the E2 When the DAC is online the LED1 will turn on for one second and off for one second However if the DAC is offline the LED1 will turn on for half a second and off for half a se...

Страница 23: ...r VAV mode 7 2 Operational Modes The DAC will be in one of nine possible modes of operation at any given time All modes have different priorities so if conditions warrant two modes to be operational at the same time one of the modes will win and become active In the table the modes are shown in ascending priority with the exception of Cooling and Dehum For example Idle is the lowest priority and E...

Страница 24: ...intain the supply air temperature at the active setpoint 7 4 1 Supply Air Setpoint Reset The active supply air setpoint may be automatically adjusted reset based on the heating or cooling terminal load present The active setpoint will be increased or decreased up to the maximum amount specified by the heating and cooling reset setpoints The maximum amount will be used when the terminal load reache...

Страница 25: ...mperature falls below this setpoint cooling will be deactivated Cooling will only be re enabled when the outside temperature rises back above the lockout setpoint plus 2 F 7 4 3 Heating Mode The DAC supports both staged and modulating mechanical heating devices A modulating device such as a hot water valve is treated as a heating stage in the case of a unit having a mixture of fixed and modulating...

Страница 26: ...ges are activated Once activated the modulating heat output will modulate to maintain the supply air temperature at the active supply air heating setpoint A PID loop will be used to determine the capacity output If the modulating heat output reaches 100 and stays there for the Heat On Delay period the first secondary heating stage will be activated Additional secondary heating stages will be broug...

Страница 27: ...ctive and heating and cool ing are not active the DAC will operate the VS fan at the CO2 Purge VS Fan Speed setpoint 7 5 1 1 3 Make up Air Offset VS Fan Speed When make up air is active the current VS fan speed will be increased by the Make up Air Offset setpoint 7 5 1 1 4 Idle VS Fan Speed When using the Continuous fan mode the DAC will use the Idle VS Fan Speed setpoint when no cooling or heatin...

Страница 28: ...dification setpoint that the controller uses is based on the occupancy state and the method of determining when dehumidification is required Both occupied and unoccupied relative humidity and dewpoint setpoints are available depending on the dehumidification method selected A dehumidification RH or dewpoint throttling range will determine the range of humidity or dewpoint that represents the full ...

Страница 29: ...s active the Reheat output will activate when the space temperature drops 1 F below the cooling space temperature setpoint However if a return air bypass damper is configured the Reheat output will not be permitted to activate until the return air bypass damper reaches 100 Once activated the Reheat output will remain active until the space temperature either rises above the cooling space temperatu...

Страница 30: ...2 Dehumidification Control 026 1727 Rev 3 multiplier setpoint For example if the RAB damper is at 50 and the RA damper multiplier is 10 the RA damper will close an additional 5 from its current position ...

Страница 31: ...Economizer Control Economizer dampers on rooftop HVAC units are used to bring outside air into the building for use in cooling The DAC supports control of two position outside air dampers as well as variable position analog dampers The DAC controls economization by first determining whether the outside air conditions are favorable for bringing in outside air see Section 7 7 3 3 Economization Enabl...

Страница 32: ...zation will be disabled 4 Dry Bulb Compare When selected this method requires an outside temperature sensor to be connected to the controller When the outside temperature is less than the inside temperature by at least 2 F economization will be enabled If the outside temperature sensor fails economization will be disabled 5 E2 Zone Enable BAS This method is always used when the DAC is connected to...

Страница 33: ...rature Sensor Failures In many cases the DAC can compensate for sensor failures by substituting other sensor values This allows the DAC to continue operating as close to normal as possible until the failed sensors can be fixed or replaced However it is important to note that if the supply temperature sensor fails the unit will not be able to turn on any heating or cooling stages This sensor must b...

Страница 34: ... if it is defined If no local outdoor humidity sensor is defined the DAC will use the outdoor humidity value received from the E2 If no valid value is received from the E2 the dehumidification function will be disabled until a valid outdoor humidity reading is detected This applies only if the dehumidification strategy is configured to use outdoor humidity or outdoor dewpoint Also when in standalo...

Страница 35: ...elect F Sensor Offsets or press to access the C0 MORE tab and scroll through the tabs to access the Sen sor Offsets Figure 7 9 5 Enter the appropriate offset value Figure 7 9 Figure 7 7 iProDAC Status Screen Press F5 Figure 7 8 iProDAC Setup Screen in E2 Ctrl 0 Tab Menu Sensor Offsets Figure 7 9 Sensor Offset Properties in E2 C0 MORE Tab ...

Страница 36: ... Contact Retail Solutions for upgrade information if the controller is a version prior to 3 0 An E2 has up to three COM ports that can be assigned for MODBUS communication COM2 an RS485 port on the E2 power interface board and COM4 and COM6 which are optional ports requiring expansion cards COM ports can only be used for one function in other words if COM2 is set up as the MODBUS you cannot connec...

Страница 37: ...o the way the device communicates Baud Default setting is 19 2k This must be changed to 9600 All devices connected to the same COM port should be set to the same baud rate Data Size Leave this field at the default value 8 Parity Leave this field at the default value None Stop Bits Leave this field at the default value 1 Press to save changes and exit 8 2 Add and Connect DACs To enable communicatio...

Страница 38: ...e The DAC is communicating normally Offline The DAC is not communicating has not been commissioned is not functional or is not powered up Verify the DAC is powered up wired correctly and has the proper network address baud rate and parity Unknown The DAC is not communicating or has not been commissioned Verify if the DAC is powered up wired correctly and has the proper network address baud rate an...

Страница 39: ...of the DAC board s from the front panel 1 From the Main Status Screen press key and select Configured Applications 2 Select DAC from the menu If multiple DACs are associated with this E2 the DAC Summary Screen will be shown To see a single DAC status screen use the arrow keys to highlight the DAC you wish to view and press Figure 8 7 Network Summary Screen ...

Страница 40: ... indicate that communication is active Closed circuit terminal Term RS485 Slave connector Rx and Tx LED to indicate that communication is active Closed circuit terminal Term Table 9 1 Descriptions of the Connections RS485 Master connector Rx and Tx LED to indicate that communication is active Closed circuit terminal Term Digital relay outputs for digital outputs with volt free contacts 3 NO relays...

Страница 41: ...b9 Analog Input 9 Temperature 0 10V 0 1V 0 5V 14 Pb10 Analog Input 10 Temperature 0 10V 0 1V 0 5V 15 5V Additional power 5VDC 16 12V Additional power 12VDC 21 Out1 Opto insulated analog output 1 0 10V 22 Out2 Opto insulated analog output 2 0 10V 23 Out3 Opto insulated analog output 3 0 10V 24 Out4 Opto insulated analog output 4 0 10V 25 GND Common opto insulated analog output 26 Out5 analog output...

Страница 42: ...pto insulated digital input 20 unsupported 61 IDC Common opto insulated digital inputs 1 to 20 volt free dry contact 70 RL1 Relay 1 normally open contact 71 C Common relays 1 2 and 3 72 RL2 Relay 2 normally open contact 73 RL3 Relay 3 normally open contact 74 C Not Used 75 C Not Used 76 RL4 Relay 4 normally open contact 77 RL5 Relay 5 normally closed contact 78 RL6 Relay 6 normally closed contact ...

Страница 43: ...nnection 99 RS485 Slave RS485 Slave connection insulated gnd 100 CAN Bus CAN Bus connection not open 101 CAN Bus CAN Bus connection not open 102 CAN Bus CAN Bus connection insulated gnd not open 103 Remote Display Connection for VISOGRAPH remote terminal Vnr 104 Remote Display Connection for VISOGRAPH remote terminal 105 Remote Display Connection for VISOGRAPH remote terminal 106 Modem Reset Not U...

Страница 44: ...l power 12V 200mA in total 5V 100mA Table 9 3 Analog Input Specifications CAUTION Any inputs that are powered with a voltage that differs from that supplied by the device 12V or 5V must be powered separately with another transformer do not use the same secondary of the controller s power in order to prevent the inputs from malfunctioning or being damaged Type configurable via software parameter Op...

Страница 45: ...5 Analog Outputs Specification CAUTION The electrical devices controlled by these analog outputs must be powered sepa rately with another transformer do not use the same secondary of the controller s power in order to prevent the outputs from malfunctioning or being damaged Type Relays with NO contacts Number of outputs 10 or 15 depending on the model Type of output configurable via software param...

Страница 46: ...38 Wiring 026 1727 Rev 3 9 4 Wiring Figure 9 1 DAC Detail NOTE DI11 through DI20 pins 51 60 are not available for use in the DAC controller ...

Страница 47: ...tus of the most common DAC outputs are shown on this screen Operation mode of controller Heating Cooling stages Fan Outdoor Damper 10 1 3 VAV Fan Status When the application is set to VAV this screen will allow you to monitor the duct static pressure as controlled by the fan or relief damper 10 2 Viewing I O Configuration 10 2 1 Analog Inputs From the main menu select 3 to navigate to the I O Conf...

Страница 48: ...gital Inputs Press the RIGHT arrow to navigate to the digital inputs configuration screen The configuration of all supported digital inputs are shown on this screen All digital inputs are fixed in position and cannot be edited 10 3 Relay Output Overrides with Visograph 1 Press 6 on the main menu to navigate to the output override screens The first override page shows all of the relay outputs To ov...

Страница 49: ...HT arrow next page to move to the analog output override screen 10 3 1 1 To Override an Analog Output 1 Use the UP and DOWN arrows to navigate to the desired analog output 2 Press the ENTER key The field will start blinking 3 Use the UP and DOWN arrows T4 and T5 to change the override to the desired voltage The choices are Auto ON and OFF 4 Press ENTER to activate the new override state 5 Press ME...

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Страница 51: ...ent Control 1 Indoor Air Quality 22 Input and Output Setup 6 Input Specs 35 Inputs 6 Installation 2 L LEDs 14 M MODBUS 4 Termination 6 Wiring 4 MODBUS 485 4 MODBUS Addressing for iPro DAC 5 MODBUS Network 4 Modes 15 Mounting and Powering 2 O Operational Modes 15 Output Specs 36 Outputs 10 Outside Air Control 22 P Powering the iPro DAC 2 R Reheat Output 21 Relay Outputs 10 Return Damper Control 23 ...

Страница 52: ...alog Output 40 Relay Output Overrides 39 VAV Fan Status 38 Viewing I O Configuration 38 analog inputs 38 analog outputs 39 digital inputs 39 relay outputs 39 Viewing Status 38 input status 38 output status 38 Visograph Connectivity 5 W Warnings Analog Inputs 8 Analog Outputs 11 Output Capacity 36 Transformers 36 Voltages 36 Wire Length 3 Wire Distance 3 Wire Gauge Types 3 Wiring 13 37 ...

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Страница 54: ...Inc and or its affiliates collectively Emerson reserves the right to modify the designs or specifications of such products at any time without notice Emerson does not assume responsibility for the selection use or maintenance of any product Responsibility for proper selection use and maintenance of any product remains solely with the purchaser and end user 026 1727 Emerson is a trademark of Emerso...

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