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Taco iWorx UCP-1, Инструкция по применению

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iWorx® VPU2

505-010-2, Effective: April 29, 2014

29 

© 2014 Taco Electronic Solutions, Inc.

Economizer Operation

The VPU2 provides support for either two-position or modulated economizer types. You can specify which type of 
economizer you are using through a configuration parameter. Both economizer types are enabled based on availability 
of “free cooling” from the outdoor air. Free cooling can be determined by dry bulb or enthalpy comparisons. In order to 
provide maximum energy savings, the cooling stages are interlocked with the economizer.

Dry Bulb Comparison

Free cooling can be determined based on a comparison of outdoor air temperature and indoor air temperature. When 
the outdoor air temperature is a programmable amount below the indoor air temperature (reference zone VAVI's zone 
temperature), free cooling is enabled. When the outdoor air temperature rises above the indoor temperature (reference 
zone VAVI's zone temperature) free cooling is disabled.

Enthalpy Calculation

An enthalpy calculation is performed periodically to determine if “free cooling” is available. The outside enthalpy is cal-
culated based on the outside air temperature and humidity. The outside temperature and humidity are measured by an 
external device (such as an ASM Series) on the network and sent to the controller. The same calculation is performed 
on the inside air based on the space temperature (reference zone VAVI’s zone temperature) and return air humidity. 
The inside enthalpy minus the outside enthalpy must be greater than the 

Free Cooling Setpoint

 in order for the econo-

mizer to be used for free cooling.

Optionally, an external device can measure the indoor air humidity globally. In this case, the return air humidity sensor 
would not be required at each VPU2.

Two-position Economizer 

If present, the two-position economizer is enabled when there is “free cooling” available as determined by the enthalpy 
calculations. When the economizer is enabled, the economizer triac output is energized. When the economizer is dis-
abled, the economizer output is de-energized. A configuration parameter is available to optionally disable the econo-
mizer during unoccupied periods. 

Modulated Economizer 

When configured, the modulated economizer is enabled when there is “Free Cooling” available as determined by the 
enthalpy or dry bulb calculations.

Figure 14: Economizer Control

When the economizer is enabled, the economizer triac output is energized. When the economizer is disabled, the 
economizer output is de-energized. A configuration parameter is available to optionally disable the economizer during 
unoccupied periods.

When the economizer is enabled, a P+I control loop modulates the economizer output. The P+I control loop modulates 
the economizer position to maintain a constant mixed air temperature.

Содержание iWorx UCP-1

Страница 1: ...cting Input Devices 10 Connecting Output Devices 11 Other Connections 12 Protocol 13 Specifications 13 Electrical 13 Mechanical 14 Application Description 15 Sequence of Operation 17 Occupancy State 17 Operational Mode 18 Setpoint Calculations 20 Supply Air Setpoint Reset Curve 20 Outside Air Temperature Lockouts 21 Heating Sequence 22 Cooling Sequence 25 Economizer Operation 29 Dehumidification 3...

Страница 2: ...iWorx VPU2 2 505 010 2 Effective April 29 2014 2014 Taco Electronic Solutions Inc THIS PAGE LEFT BLANK INTENTIONALLY ...

Страница 3: ...chnology The controller can be networked to a higher level control system for monitoring and control applications Features Four stages of cooling or floating point valve control or a modulated output valve or variable speed circulator Two stages of heating or floating point valve control or a modulated output valve or variable speed circulator Dehumidification Modulated fan speed Digital or modula...

Страница 4: ...tion or other abuse For further informa tion please refer to the last page of this Document for the company s Limited Warranty Statement which is also issued with the product or available at www taco hvac com APPLICABLE DOCUMENTATION See the table below for additional documentation that may be applicable to this controller Description Audience Purpose iWorx VPU2 Application Guide Document No 505 0...

Страница 5: ...device pursuant to Part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference This equip ment can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a par ticular installation If ...

Страница 6: ...24 Volts AC To calculate power source current requirements add the power consumption of all peripheral devices to that of the controller The controller and sensor power supplies can use the same power source If both are using the same power source the loads must have EMF protection This protection can be integral to the load or installed in the 24 VAC wiring across the load s coil To provide neces...

Страница 7: ...he control enclosure and wiring conduit Grounding the Device The ground terminal T40 must be securely connected to earth ground Failure to properly ground this equipment will result in improper operation Improper grounding may also increase the risk of electrical shock and may increase the possibility of interference with radio TV reception For best performance connect the power supply common term...

Страница 8: ...utions Inc WIRING INFORMATION WARNING Terminals 6 9 12 15 and 18 are connected internally on all VPU2 controllers Disconnect ALL power sources when installing or servicing this equipment to prevent electrical shock or equipment damage Figure 2 Typical VPU2 Wiring Example A ...

Страница 9: ...iWorx VPU2 505 010 2 Effective April 29 2014 9 2014 Taco Electronic Solutions Inc Figure 3 Typical VPU2 Wiring Example B ...

Страница 10: ...nsor to RAH T19 and the other wire to the adjacent common T18 The sensor must be of the 0 10 Volt type If global indoor air humidity readings are being provided over the network it is not necessary to attach a return air humidity sensor directly to the VPU2 Mixed Air MAT To connect the Mixed Air thermistor to the unit attach one wire from the thermistor to MAT T17 and the other wire to the adjacen...

Страница 11: ...ust be a dry contact normally closed switch For an analog sensor it must be of the 0 10V type Static Pressure SPR To connect the static pressure sensor to the analog input attach the positive wire from the sensor to SPR T8 and the other wire to the adjacent common T9 The sensor must be analog 0 to 10 volt type Return Air Temperature RAT To connect the return air temperature thermistor to the analo...

Страница 12: ...tage 1 or Heating Floating Point Valve Open H1 The heating stage output must be connected to a 24 VAC pilot relay if the load is greater than 1 Amp See preceding figures for details If the load is less than 1 Amp connect heating stage 1 to H1 T25 and TC56 T24 For control of a floating point heating valve connect H1 T25 as the valve open signal TC56 T24 is the common Heating Stage 2 or Heating Floa...

Страница 13: ...rporation SPECIFICATIONS Electrical Inputs Cabling twisted shielded pair 18 AWG recommended 500 feet max 152 meters Resolution 10 bit Mixed Low Limit Filter Status Smoke Detect Local IAQ Alarm Dry Contact Normally Open 5 Volts DC Max Fan Proof Dry Contact Normally Closed 5 Volts DC Max Return Air Humidity Static Pressure 0 10 Volts DC Mixed Air Temperature Supply Air Temperature Return Air Tempera...

Страница 14: ... 166 mm wide 1 75 deep 44 mm ABS Weight Controller Weight 0 70 pounds 0 32 kilograms Shipping Weight 1 0 pounds 0 46 kilograms Electronics Processor 3150 Neuron 10 MHz Flash 48 Kilobytes SRAM 8 Kilobytes Termination 0 197 5 0 mm Pluggable Terminal Blocks 14 22 AWG Environmental Temperature 32 F to 140 F 0 C to 60 C Humidity 0 to 90 non condensing Agency Listings UL Listed for US and Canada Energy ...

Страница 15: ... a zone is in extended occupancy or when there is a call for emergency heating The fan speed control operates to maintain a configurable system static pressure setpoint Fan speed is calculated by a Proportional Integral P I control loop based on the measured static pressure and setpoint As the pressure increases above the pressure setpoint the fan speed output is throttled back As the pressure dec...

Страница 16: ...ith a time proportioned control algorithm to minimize excessive cycling The sequencing is based on the supply air temperature and cooling setpoint The cooling stages are interlocked with the economizer control If the economizer is enabled the cooling stages do not sequence on until the economizer has reached its open position If configured for modulated analog output the cooling output position is...

Страница 17: ...zer to open more than usual If the condition has not been cleared after a programmable delay an alarm is sent to the LCI The VPU2 monitors a digital input to determine the presence of smoke When the input indicates smoke the controller immediately turns off the fan and all stages of heating and cooling An alarm is reported to the LCI when this condition exists The VPU2 remains in the shutdown alar...

Страница 18: ...f the heating mode During morning warm up all VAVI controllers control to their occupied setpoints regardless of their occupancy state After morning warm up the VPU2 enters the occupied state and delays the staging of cooling for one stage time Morning Cool Down Similarly to morning warm up the VPU2 can perform morning cool down cooling the soon to be occupied zones to a comfortable level before o...

Страница 19: ...he controller remains in the cooling state for thirty minutes or until no associated controllers are requiring cooling after which the VPU2 reverts to the shutdown state Extended Occupancy When the VPU2 is in Shutdown state and a VAVI zone controller has indicated extended occupancy the controller enters the Extended Occupancy state also known as Bypass The Extended Occupancy state acts identicall...

Страница 20: ...t Reset Curve is enabled the VPU2 keeps track of the differential between each zone s space temperature and its temperature setpoint The VPU2 selects the zone with the greatest differential and uses that Temperature Differential to adjust the Supply Temperature Setpoint If the Temperature Differential is less than the Temperature Differential Minimum then the Supply Temperature Set point Low will ...

Страница 21: ...OAT Heat If the OAT is above the heating lockout temperature the primary heating mode is disabled and the controller can only be in the primary off or primary cooling modes This feature requires a controller that broadcasts the OAT such as an ASM2 be installed on the network Cooling can be disabled during cold weather by setting the outdoor air temperature cooling lockout Min OAT Cool If the OAT i...

Страница 22: ...period the next available stage is turned on If all zone tempera ture readings are within 0 5 F of their setpoints the next stage does not cycle on This cycle continues until all avail able stages have been energized After the supply temperature has risen above the heating setpoint the first available stage is turned off If the supply air temperature remains above the heating setpoint for an addit...

Страница 23: ...r when heating is required to heat the mixed air temperature to reach the supply air setpoint During unoccupied and cooling periods the heating valve is driven to 0 During mixed air low limit alarms the heating valve is driven to 100 The floating point control is similar to the heating staging algorithm If the supply air temperature is below the supply air setpoint the valve is driven open When th...

Страница 24: ...iWorx VPU2 24 505 010 2 Effective April 29 2014 2014 Taco Electronic Solutions Inc Figure 9 Modulated Staging with 2 Stages 2nd Stage Modulating ...

Страница 25: ...ooling Stages The cooling sequence is initiated when the current operating mode calls for cool The cooling compressor stages are sequenced based on the supply temperature the cooling setpoint and the control band When the supply air tempera ture rises above the cooling setpoint plus the control band a stage is turned on If the supply air temperature remains above the control band for an additional...

Страница 26: ...ng point valve is calibrated by closing the valve for a period of the travel time This ensures that the valve is fully closed When the valve is at its calculated 0 or 100 position the valve is overdriven for 30 seconds to ensure that the valve is fully closed or open The floating point control is similar to the cooling modulated algorithm If the space temperature is above the cooling setpoint the ...

Страница 27: ...odulated modes In the combined mode of operation the modulated out put is considered to be one of the stages The stage to be associated with modulation is selected in the Staged Cooling configuration page Modulation starts when the selected stage would normally start i e if stage 2 is selected as the modulating stage it starts if stage 1 has been active for the Staging Interval and the temperature...

Страница 28: ...rx VPU2 28 505 010 2 Effective April 29 2014 2014 Taco Electronic Solutions Inc Figure 12 Modulated Staging with 2 Stages 2nd Stage Modulating Figure 13 Modulated Staging with 2 Stages 1st Stage Modulating ...

Страница 29: ...ller The same calculation is performed on the inside air based on the space temperature reference zone VAVI s zone temperature and return air humidity The inside enthalpy minus the outside enthalpy must be greater than the Free Cooling Setpoint in order for the econo mizer to be used for free cooling Optionally an external device can measure the indoor air humidity globally In this case the return...

Страница 30: ... on and the stage timer is enforced or modulating output or floating point valve will be set to 100 Fan Operation During Morning Warm up Occupied Extended Occupancy and Emergency Heating states the fan runs continuously During the shutdown state the fan is off The fan can be overridden from the LCI or another host controller When the fan is overridden the static pressure P I loop control is disabl...

Страница 31: ...op control Fan Proof A fan status input is provided for monitoring the operation of the fan When the fan is initially turned on there is a 30 second delay before the fan status is checked If at any time after the delay the fan status indicates the fan is not run ning a fan failure condition is generated The heating and cooling stages are interlocked with the fan When a fan fail ure condition exist...

Страница 32: ...fter being powered on or after a reset No control takes place until after the thirty second delay has expired Supply Air Temperature Monitoring The VPU2 monitors the supply air temperature to determine if the heating and cooling stages are operating properly During heating mode if the supply air temperature does not rise above the heat mode alarm setpoint after a 10 minute delay a heat mode alarm ...

Страница 33: ...ion is still present after the IAQ Alarm Delay the alarm message is sent to the LCI Return Air IAQ The VPU2 can read the status of an IAQ sensor placed in the return air duct When the IAQ sensor indicates that con taminates are above a preset limit the VPU2 energizes the fan After a preset time delay the economizer is enabled to supply fresh air to the zones All of the zones are made aware of the ...

Страница 34: ...cooling runtime heating runtime or fan runtime exceeds these limits a maintenance alarm is sent to the LCI Automatic Configuration The VPU2 and iWorx Local Control Interface LCI use a self configuring network management scheme requiring no external tools binding or LONWORKS knowledge The LCI recognizes and configures the VPU2 when the controller s service pin is pressed The controller s status lig...

Страница 35: ... status switch Indoor Air Qual Normal Alarm Status of the IAQ alarm sensor when defined as Digital Occupancy Mode Occupied Unoccupied Bypass Occupancy mode of the controller Supply Air Temp 29 to 230 F 34 4 to 110 C Temperature of the supply air duct Mixed Air Temp Temperature of the mixed air ple num Return Air Temp Temperature of the return air duct Return Air Humidity 0 00 to 100 00 Humidity in...

Страница 36: ...tings Structure N A Fan VFD settings Staged Cooling Structure N A Staged Cooling Settings Modulated Cooling Structure N A Modulated Cooling Settings Floating SP Cooling Structure N A Floating Point Valve Cooling Set tings Staged Heating Structure N A Staged Heating Settings Modulated Heating Structure N A Modulated Heating Settings Floating SP Heating Structure N A Floating Point Valve Heating Set...

Страница 37: ...00 F 12 78 C Temperature setpoint for the cool ing mode Heating Setpoint 55 00 to 130 0 F 12 8 to 54 4 C 90 00 F 32 22 C Temperature setpoint for the heat ing mode Supply Cool Limit 0 00 to 30 0 F 0 00 to 16 6 C 10 F 5 5 C Minimum temperature change from cooling setpoint in 10 minutes to avoid a cooling failed alarm Supply Heat Limit 0 00 to 30 0 F 0 00 to 16 6 C 10 F 5 5 C Minimum temperature cha...

Страница 38: ... C 0 05 Integral gain of the economizer s P I control loop Minimum Output 0 0 to 10 0 V 0 0 V Minimum voltage output for the fan VFD Maximum Output 0 0 to 10 0 V 10 0 V Maximum voltage output for the fan VFD Press Min 2 5 to 5 00 W C 623 to 1246 Pa 0 00 W C 0 Pa Static pressure to report when the analog input receives 0 volts Press Max 2 5 to 5 00 W C 623 to 1246 Pa 2 00 W C 498 Pa Static pressure...

Страница 39: ... for the valve to travel from fully closed to fully open If set to 0 floating point is dis abled Deadband 0 0 to 100 0 10 The desired setpoint must be this far or greater from the actual posi tion before modulating the actuator Setting Range Default Description Type Disabled 2 St Unocc On 2 St Unocc Off Mod Unocc On Mod Unocc Off Disabled If using an economizer set this field to a value that descr...

Страница 40: ... enthalpy and outside enthalpy that enables or disables the economizer Drybulb Offset 0 0 to 20 0 F 0 0 to 11 1 C 5 00 F 2 78 C Difference between zone tempera ture and outside temperature that enables or disables the econo mizer Setting Range Default Description Type Occupied Always enabled Occupied Defines when dehumidification is enforced Setpoint 0 00 to 100 00 0 Humidity Setpoint Shutoff offs...

Страница 41: ...IAQ Alarm conditions Deadband 0 to 400 ppm 0 ppm Deadband to allow the IAQ to recover from the alarm condition Setting Range Default Description Min 0 to 4000 ppm 0 ppm Minimum ppm sensor setting Max 0 to 4000 ppm 0 ppm Maximum ppm sensor setting Setpoint 0 to 4000 ppm 0 ppm Setpoint Offset 0 to 4000 ppm 0 ppm Offset to the sensor reading Setting Range Default Description Max OAT Heat 7 6 to 122 F...

Страница 42: ... input detects that the filter needs to be replaced Automatic when the dirty filter is replaced Indoor Air Quality Normal Alarm Occurs when the IAQ sensor detects inadequate indoor air qual ity Automatic when air quality returns within normal parameters Heating Failure Normal Alarm Occurs when Supply Air tempera ture is Supply Heat Limit degrees from the setpoint 10 minutes after entering heating ...

Страница 43: ...on Status Solid green when running and configured by an LCI networking Flashing green when running and NOT configured by an LCI stand alone Solid red when a fault condition exists control shut down Blinking Red the controller has a device failure Solid Amber The controller has not received a LCI ping message in over 10 minutes and is part of a network Network Yellow while the controller is transmi...

Страница 44: ...ated No power to controller Verify the voltage on the controller s power connector 24 VAC How do I reset the controller The controller can be reset by the LCI or you can cycle power to the controller Refer to the LCI documentation for more information on resetting the controller using the LCI Can my iWorx system contain multi ple VPU2 controllers Yes provided that you do not exceed the maximum num...

Страница 45: ...ered by this warranty TES products are not intended for use to sup port fire suppression systems life support sys tems critical care applications commercial aviation nuclear facilities or any other applica tions where product failure could lead to injury to person loss of life or catastrophic property damage and should not be sold for such pur poses If in doubt as to whether a particular product i...

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