The Best New Product From Siemens…

The best new product from Siemens...

that is a very difficult question to answer given all the new products and solutions Siemens is bringing into the HVAC and Smart Building Controls Space. 

  The Siemens new line of Variable Frequency Drives, their integration of Comfy and J2 Innovations into their suite of building automation controls, and Desigo are just a few that come to mind..You can click here and find out more from our interview with Siemens senior sales manager, Josh Felperin.

As cool and innovative as all those products are, I want to feature a product that might not be recognized  for just how special it is ….

The Siemens POL 220 is a carefully thought out, elegant new version of the economizer control. Siemens has reimagined, and redesigned the classic economizer controller.

Some of the things I really like about the Siemens POL:

  1. You don’t need any software to configure it. I am still old school at heart , so dip switches and potentiometers work for me. They make me feel young again! And the fact that Siemens made sure not to skimp on the pots and dip swiches, makes them feel good in the hand and easy to see.
  2.  I can select three free cooling strategies:  temperature, humidity , and even Demand Control ventilation based on CO2 sensors.
  3. The plug and Play Feature will automatically determine which configuration you need once you have your sensors wired and power up the controller for the first time.

70% of Economizers are not working or functioning properly .... is replacing these a low cost opportunity to grow your revenue?

Two Things That are not Great about the POL 220...

or maybe more accurately two things you should know:

1 The Siemens POL 220 does not communicate via a communication protocol like BACnet of Lon with a building automation control system. You have to go old school and let it work stand alone.

2. As you saw in the video, it will not be Title 24 compliant for new construction, but it should be for replacement of old economizers.

The Siemens POL 220 provides new world functionality with an old world craftsman feel

Let’s get technical:

Product Description

User Guide

Document No. 125-1902 May 9, 2016

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The Economizer Controller allows the use of unconditioned outside air to cool a building. The Free Cooling air determination is based on customer temperature and humidity selections, as well as optional Demand Control Ventilation (DCV) strategies with CO2 level selection.

Features

  • Economizer control provides “free cooling”based on single or dual dry bulb temperature, or combination temperature + humidity sensors.

  • Wide temperature shut-off setpoint range selection and Btu/lb selection range selectable by DIP switches.

  • Potentiometers allow accurate adjustment of DCV, exhaust fan levels, and minimum damper position.

  • Versions with remote minimum position damper adjustments accept either 0 to 10 Vdc or 135 Ohm potentiometer signals.

  • Used with Siemens OpenAir® damper actuators.

  • Flexible sensor inputs accept 10K or 3K

    standard NTC sensors, or Siemens QFM2160U combination temperature/humidity 0 to 10V sensor for enthalpy control.

  • LED Indication when in Free Cooling operation, DCV operation and exhaust fan operation as well as during sensor failure.

  • Quick installation and easy commissioning.

  • Two-stage cooling control.

  • Occupancy input with default capability.

  • Quick connect I/O with 1/4” spade connections.

  • Anti-freeze protection.

  • Brownout protection.

    Product Numbers

    Item Number 125-1902, Rev. FA

Contents

  •   Economizer Controller

  •   Two No. 6 3/4” self-tapping screws

    Accessory

    985-960 Jumper Accessory

    Warning/Caution Notations

    Prerequisites

    For proper Economizer Controller operation, read this User Guide carefully, and follow the instructions in the Economizer Controller Start-up/ Commissioning Mode section. Failure to do so may result in damage to the product or create a hazardous condition. Installation of this controller must be performed by a trained HVAC service technician.

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CAUTION/ATTENTION

Equipment damage or loss of data may occur if you do not follow a procedure as specified.

Risque de dégâts matériels ou de perte de données, en cas de non-respect des procédures à suivre.

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WARNING/AVERTISSEMENT

Personal injury may occur if you do not follow a procedure as specified.

Risque de blessures graves en cas de non-respect des procédures à suivre.

Economizer Controller Single

Economizer Controller Multi-pack (20)

Remote Potentiometer Input Type

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POL220.05

POL220.00

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BSG61 (0-10 Vdc)

POL220.10

POL220.15

LVC2 (135Ω)

Page 1 of 16

Document No. 125-1902 User Guide
May 9, 2016

Basic Economizer Control Modes

  1. Control Mode 1: Fixed Dry-bulb

    (Single dry-bulb)
    Outside air and mixed air temperature sensors are used.

  2. Control Mode 2: Differential Dry-bulb (Dual Dry-Bulbs)
    Outside air, return air, and mixed air temperature sensors are used.

  3. Control Mode 3: Combination Fixed Enthalpy and Fixed Dry-bulb Control
    Outside air temperature and humidity sensors, and mixed air temperature sensors are used.

  4. Control Mode 4: Combination of Differential Enthalpy and Fixed Dry-bulb
    Outside air temperature and humidity sensors, return air temperature and humidity sensors, and mixed air temperature sensors are used.

Specifications

Electrical Ratings:

Input Voltage: 24 Vac ±25%; 50/60 Hz (Class 2). Nominal Power Consumption (at 24 Vac, 60 Hz): 4 VA.
Relay Contact Rating at 30 Vac (maximum power from Class 2 input only): 1.5A run, 3.5A inrush.

NOTE:

All inputs and outputs must be 24 Vac Class 2.

Ambient Ratings:

Temperature: -40°F to 149°F (-40°C to 65°C). Humidity: 5 to 95 percent RH (non-condensing).

Inputs:

Combination Temperature/Humidity Sensor (QFM2160U): 5-wire (18, 20, or 22 AWG cable) connection.

Dry Bulb Temperature Sensor 10K Ohm Type II NTC (QAM2030.010) or 3K NTC: 2-wire
(18, 20, or 22 AWG cable) connection.

DCV (CO2) Sensor (QPA2000): 3- wire (18, 20, or 22 AWG cable)
0 to 10 Vdc control signal

Outputs:

Actuator (GCA151.1P GMA151.1P, GQD151.1P): 4-wire (18 AWG)
Actuator Signal: 2 to 10 Vdc.
Actuator Input Resistance: 100K ohm.

The controller provides 7 VA max. to operate the damper actuator.
Exhaust Fan: Contact closure.

Auxiliary Equipment:

  •   RDY2000 Commercial Thermostat

  •   LVC2 (135 Ω) Control Board for remote minimum

    damper positioning (POL220.10 and POL220.15)

  •   BSG61 (0-10 Vdc) for remote minimum damper

    positioning (POL220.00 and POL220.05)

    Wire the electrical connections using 1/4” female,insulated spade connections.

    Approvals:

    UL listed per UL873.
    CE
    RCM
    cUL Listed per CSA – C22.2 No. 24

    Suitable for plenum installation UL/NEMA Type 1

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Dimensions:

5.10” × 4.70” × 1.10”
(130 mm × 120 mm × 28 mm)

Weight:References

POL220 Series Economizer Application Guide (125-1010)

Required Tool

Phillips Screwdriver

Expected Installation Time

15 minutes

Installation

Mount the controller to sheet metal ductwork or a panel using two self-tapping screws (provided). The mounting location must protect the controller from the elements and ultraviolet rays.

0.49 lbs (221 g)

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Figure 1. Controller Mounted to Ductwork.

Outdoor, Return Air, and Mixed Air Sensor Operating and Mounting Instructions

Location and Mounting

The Economizer Controller accepts signals from either the QAM2030.010 (10K, Type II) dry bulb temperature sensor, or 3K NTC temperature sensor. It provides single or differential temperature based economizer control or the QFM2160U combination temperature/humidity sensor for single or dual enthalpy-based economizer control.

CAUTION/ATTENTION:

Do not mix sensors.
Temperature sensors must all be either 10K Ohm Type II NTC, or 3K NTC.

Ne mélangez pas de détecteurs.
Les détecteurs de température doivent tous être l’un ou l’autre le Type II d’Ohm de 10 Ko NTC, ou 3 Ko NTC.

For differential dry bulb operation, use two QAM2030.010 (10K Type II NTC) or 3K NTC temperature sensors.

Document No. 125-1902 User Guide May 6, 2016

NOTE: 3K NTC sensors must follow this curve.

Sensor Mounting

  1. Mount the sensor in any orientation, exposing it to freely circulating air, using the two mounting screws provided with the sensor. Choose a location that protects it from rain, snow, and direct sunlight.

  2. Connect the appropriate Type II NTC 10K or 3K sensor for:

o Outside Air: Connect to the OAT and COM terminals of the device.

o Return Air (Differential): Connect to the RAT and COM terminals of the device.

o Mixed Air: Connect to the MAT and COM terminals of the device.

Figure 3. Type II NTC 10K or 3K Sensor Connections.

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3.

Connect the QFM2160U Combination Temperature/Humidity sensor for Enthalpy control.
o Outside Air: Connect to the OAT, COM, and

OAH terminals of the device.
o Return Air (Differential): Connect to the

RAT, COM, and RAH terminals of the device.

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Page 3 of 16

Figure 2. 3K NTC Curve.

Figure 4. QFM2160U Combination Temperature/Humidity Sensor Connections.

Document No. 125-1902 User Guide
May 9, 2016

NOTE: QFM2160U Combination Temperature/ Humidity Sensors must be powered by an external 24 Vac power supply.

CO2 Sensor – Demand Control Ventilation (DCV)

  1. Mount the QPA2000 CO2 Sensor in an area with unobstructed air circulation. See QPA…SeriesIndoor Air Quality Room Sensors Installation Instructions (129-435).

  2. Connect the sensor to the IAQ and COM terminals of the controller. See Figure 4.

NOTE: CO2 sensors must be powered by an external 24 Vac power supply.

Powering the Economizer Controller

To power the Economizer Controller, connect a 24 Vac external power supply source.

Figure 5. Connecting to Power Supply Source.

Damper Actuator Connection to the Economizer Controller

  1. Connect the appropriate Siemens OpenAir Damper Actuator to the controller actuator input as shown.

  2. Select the appropriate modulating (2 to 10 Vdc) spring return damper actuator to operate the Economizer damper. See Table 1.

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Figure 6. Damper Actuator Connections. Table 1. Damper Actuator Selection.

Economizer Controller Startup/Commissioning Mode

Factory default settings:
All DIP switches are in the OFF (down position).

NOTE:

Use a small, flat-blade screwdriver to select DIP switches. Ensure that the switches are fully in theON or OFF position.

All potentiometers are in the middle position (arrow pointing upwards).

Initialization

  1. Connect the sensor inputs and other auxiliary equipment.

  2. Use the DIP switch to select a 3K or 10K sensor (see Figure 7).

  3. Use the DIP switch to select Single (SNGL) or Differential (DIFF) mode (see Figure 7).

  4. Apply power to the controller (see Figure 5).

  5. The controller will perform up to a 20-second

    auto detection to determine the type of sensor

    input(s).

If you experience a transient power failure during initialization, the compressors will not suddenly restart because the outputs are deactivated.

Commissioning Mode

This Commissioning mode (COMM) adjusts the Minimum Position of the outside air damper. In the Commissioning mode, the damper will be overridden by Effective MIN POS, or DCV ACT, whichever is greater.

Effective MIN POS is determined by either theonboard MIN POS potentiometer or the Remote MIN POS potentiometer:

Move the DIP switch on the bottom of the controller to the COMM position (see Figure 7) to enter the Commissioning mode. When the Free Cooling LED and DCV LED blink red, this indicates that the controller is in the Commissioning mode. CC1 and CC2 are energized in the Commissioning mode, and the exhaust fan responds to the outside air damper.

Determining Required Airflow

The Consulting Engineer defines the minimum damper position by the minimum outdoor airflow required in the building during the occupied period. To determine the minimum amount of outside air to bring in the building, use these basic guidelines:

Document No. 125-1902 User Guide May 9, 2016

The OA rate can be calculated by this formula:

OA

A minimum 10°F temperature differential between OA and RA must be maintained;otherwise, this formula doesn’t work well.

OR
An airflow measuring station can be used to

directly tune the outdoor airflow volumetric rate to designed value. OA rate can be calculated

from formula , where

minimum differential temperature between OA and RA is not required.

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Page 5 of 16

Setting Minimum Position in Commissioning Mode

If a Remote Positioning Potentiometer is being used:

  1. Turn the MIN POS potentiometer to the fully closed, 0 position.

  2. Turn the DCV ACT potentiometer to the fully closed, 0 position

  3. Adjust the Remote MIN POS Potentiometer until the designed OA flow rate is met.

  4. After the Remote MIN POS Potentiometer adjustment is complete, turn the DCV ACTpotentiometer until designed DCV OA flow rate is met. The DCV ACT setting should be greater than the Remote MIN POS Potentiometer setting.

  5. When these adjustments are completed, set the DIP switch to AUTO to resume normal operation.

If the onboard MIN POS Potentiometer is being used:

  1. Turn the Remote MIN POS Potentiometer to the fully closed, 0 position.

  2. Turn the DCV ACT potentiometer to the fully closed, 0 position,

  3. Turn the MIN POS potentiometer until designed OA flow rate is met.

  4. After MIN POS adjustment is complete, turn theDCV ACT potentiometer until designed DCV OA flow rate is met. The DCV ACT should be greater than MIN POS.

  5. After all MIN POS and DCV ACT adjustments are completed, set the DIP switch to AUTO to resume normal operation.

Document No. 125-1902 User Guide
May 9, 2016

Selecting the Shut-off Temperature and Enthalpy Setpoint
The damper will be open and will allow for free cooling below the temperature shut-off setpoint selected from one of the six DIP switches located on the bottom right corner of the controller cover (see Figure 7).

The numbered DIP switches correspond to the shut- off temperature values (see Table 2). When all of the DIP switches are in the down position and no number is selected (factory default), the default temperature shut-off setpoint value is 75°F.

Table 2. Shut-off Temperature Values.

For Economizer operation based on both temperature and humidity, the enthalpy shut-off setpoint value may be selected from the following lettered DIP switches. When the three DIP switches are in the down position, the default enthalpy shut- off value is 28 Btu/lb.

Table 3. Enthalpy Shut-Off Values.

For further assistance in determining these shut-off setpoint values, see ASHRAE 90.1.2014 for a guideline for shutoff control types for specific climate zones.

Selecting Single or Differential (Dual) Sensors

Basic Economizer Control Modes

Control Mode 1: Fixed Dry-bulb (Single Dry-Bulb)

  •   OA temperature sensor and MA temperature

    sensor are used.

  •   Set the DIP switch to SNGL (single) mode. See

    Figure 7.

  •   The outside-air dry-bulb temperature is

    compared to a shut-off dry-bulb temperature. If the outside-air dry-bulb temperature is below the shut-off dry-bulb temperature, then the outside air is used to meet all or part of the cooling demand.

    Control Mode 2: Differential Dry-bulb (Dual Dry- Bulbs)

  •   OA temperature sensor and RA temperature

    sensor, MA temperature sensors are used.

  •   Set the DIP switch to DIFF (Differential) mode.

    See Figure 7.

 The outside-air dry-bulb temperature is compared with the return-air dry-bulb temperature. If the outside-air dry-bulb temperature is less than the return-air dry-bulb temperature, then the outside air is used to meet all or part of the cooling demand.

Control Mode 3 – Combination Fixed Enthalpy and Fixed Dry-bulb Control

  •   OA temperature and Humidity sensor, and MA

    temperature sensor are used.

  •   Set the DIP switch to SNGL (Single) mode. See

    Figure 7.

  •   Determine the shut-off setpoint by a combination

    of two parameters:

    • –  Enthalpy shut-off SP

    • –  Dry-bulb shut-off SP

  •   Determine if the outside air can be used for Free cool:

    If the outside-air enthalpy is lower than the shut- off enthalpy setpoint, and the outside air dry bulb temperature is lower than the shut-off dry bulb setpoint, then the outside air can be used.

    Control Mode 4 – Combination of Differential Enthalpy and Fixed Dry-bulb

  •   OA temperature and humidity sensor, and return

    temperature and humidity sensor, and MA

    temperature sensor are used.

  •   Set the DIP switch to DIFF (Differential) mode.

    See Figure 7.

  •   Determine if outside air can be used for Free

    cooling: If outside-air enthalpy is lower than the return air enthalpy, and the outside air dry bulb temperature is lower than the dry bulb temperature shut- off setpoint, then outside air can be used.

    NOTE: See the POL220 Series Economizer Controller Application Guide (125-1010) for additional information.

    Demand Control Ventilation Setpoint (DCV Only)

    The controller will modulate the outside air damper based on the CO2 level through the ppm value selected by the DCV SET potentiometer between the range of 500 and 1500 ppm, on the controller, as shown in Figure 7.

    To disable the DCV, turn the DCV ACTpotentiometer counter-clockwise to 0%.

    If a CO2 sensor is not used with the controller, the OA damper will modulate based on the Free Cooling logic.

Default

1

2

3

4

5

6

75°F

50°F

55°F

60°F

65°F

70°F

80°F

Default

A

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B

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C

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28 Btu/lb

22 Btu/lb

24 Btu/lb

26 Btu/lb

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If the CO2 sensor has failed, the damper will be controlled by the Free Cooling logic.

Exhaust Fan Operation and Setting

Figure 8. Relay Connection.

The exhaust fan contacts are 24V dry contacts only, and are labeled Q31 and Q32. An external line voltage contactor is required to operate the exhaust fan.

If the EX FAN potentiometer is turned fully counter- clockwise to 0%, the EX FAN feature is disabled. This feature allows the exhaust fan operation to be disabled instead of being operated at constant ON.

The exhaust fan shut-off point is selected by setting the EX FAN potentiometer to the desired level. See Figure 7.

When the damper position reaches the exhaust fan setpoint, the exhaust fan relay will be energized. A Green exhaust fan LED indicates that the exhaust fan is ON.

Cooling Stage Operation

Figure 9. Cooling Stage Operation.

The Economizer Controller accepts inputs for single- and two-stage cooling inputs, and reroutes to the RTU through the relay connection CC1 and CC2.

The operation of the cooling stages is determined by the availability of Free Cooling provided by the economizer operation mode. SeeTable 4.

Based on the use of Free Cooling, the operating modes are as follows:

  •   Y1 is Stage 1 Cooling Demand.

  •   Y2 is Stage 2 Cooling Demand.

  •   Free Cooling is always the first cooling stage.

  •   The Cool Stage 1 call from the Commercial

    Thermostat (Y1) energizes the CC1 input to the Economizer Controller.

Document No. 125-1902 User Guide May 9, 2016

 The Cool Stage 2 call from the Commercial Thermostat (Y2) energizes the CC2 input to the Economizer Controller.

Table 4. Cooling Stage I/O Logic.

* If OAT<56°F, then Relay 2 is always OFF to disable Cooling Stage 2. Otherwise, if both stages of cooling (Y1 and Y2) are ON for more than 5 minutes, Y2 remains ON, and the OAT is greater than 56°F, then Relay 2 will energize to allow Y2 pass-through to enable Cooling Stage 2.

Remote Positioning Potentiometer

BSG61, 0 to 10 Vdc for POL220.00 and POL220.05

The BSG61 Remote Positioning Potentiometer can be used to remotely set the minimum damper position and connect the RP and COM terminals of the device.

Figure 10. RP and OCC Terminals.

This input offsets the damper minimum position setting (MIN POS).

NOTE: The BSG61 Remote Positioning Potentiometer must be powered by an external 24 Vac power supply.

When the remote potentiometer is installed, set the MIN POS potentiometer to 0%; the damper position will receive positioning signals from the BSG61 Remote Potentiometer.

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Economizer

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Y1 Thermostat

Y2 Thermostat

Cooling Stage 1

Cooling Stage 2

OFF

ON

ON

ON

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ON

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OFF

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ON

OFF

ON

OFF

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OFF

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OFF

OFF

OFF

OFF

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ON

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ON

ON

ON

OFF*

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ON

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ON

OFF

OFF

OFF

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ON

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OFF

OFF

OFF

OFF

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Page 7 of 16

Document No. 125-1902 User Guide
May 9, 2016

LVC2, 135 Ohm for POL220.10 and POL220.15

The LVC2 Control Board can be used to remotely set the minimum damper position and connect the RP and COM terminals of the device.

Figure 11. RP and OCC Terminals.

This input offsets the damper minimum position setting (MIN POS).

When the remote potentiometer is installed, set the MIN POS potentiometer to 0%; the damper position will receive positioning signals from the LVC2 Control Board.

Occupancy Input

The Economizer Controller can input an occupancy signal from the commercial thermostat on inputs OCC and COM. If an occupancy signal is not available, order Jumper Accessory 985-960, and connect to these inputs to default the occupancy status to ON.

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LED Fault Detection and Diagnostics

When OFF, the minimum damper position is 0%.Table 5. LED Pattern Summary.

Status

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Free Cooling LED

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Demand Control Ventilation LED

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Exhaust Fan LED

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Commissioning mode

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Red Blinking

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Red Blinking

 

Power-Start-up

Orange

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Orange

Green

MA/OA Sensor failure in SNGL mode

Red On

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MA/OA/RA Sensor failure in DIFF mode

Red On

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MIN POS potentiometer Failure

Red On

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CO2 Sensor failure when DCV is enabled

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Red On

 

DCV SET/DCT ACT potentiometer failure

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Red On

 

DCV SET position is inappropriate

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Fast Red Blinking

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Brownout

Red On

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Red On

 

Failure to detect valid FC Sensor mix during initialization

Red On

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Application

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Figure 12. Connected Economizer System Components Location Example.
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Wiring Guide

Document No. 125-1902 User Guide May 9, 2016

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Figure 13. Two-Stage Cooling System with Single Dry-Bulb Changeover Control Mode.

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Document No. 125-1902 User Guide
May 9, 2016

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Figure 14. Two-Stage Cooling System with Dual Dry-Bulb Changeover Control Mode.

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Figure15. Two-StageCoolingSystemwithSingleEnthalpyChangeoverControlMode.

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Document No. 125-1902 User Guide May 9, 2016

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Document No. 125-1902 User Guide
May 9, 2016

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Figure 16. Two-Stage Cooling System with Dual Enthalpy Changeover Control Mode.

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Document No. 125-1902 User Guide May 9, 2016

Figure 17. Optional CO2 Sensor and Remote Potentiometer LVC2, 135 Ohm.

Figure 18. Optional CO2 Sensor and Remote Potentiometer BSG61, 0 to 10 Vdc.

The installation is now complete.

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Document No. 125-1902 User Guide
May 9, 2016

Dimensions

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TroubleshootingWARNING/AVERTISSEMENT:

Do not open the actuator.
Ne pas ouvrir le servomoteur !

Figure 19. Dimensions in Inches (Millimeters).

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