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


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.


  • 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


  •   Economizer Controller

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


    985-960 Jumper Accessory

    Warning/Caution Notations


    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.



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.



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





BSG61 (0-10 Vdc)



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.


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.


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).


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


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.


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

    Suitable for plenum installation UL/NEMA Type 1

Page 2 of 16

Siemens Industry, Inc.


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


POL220 Series Economizer Application Guide (125-1010)

Required Tool

Phillips Screwdriver

Expected Installation Time

15 minutes


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)


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.


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.



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.


Siemens Industry, Inc.

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.