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MicroMetl ECH-SRTCB-DC Install Manual

Economizer
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Economizer
ECH-SRTCB-DC
Install Guide
Foremost HVAC Accessory Manufacturer

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Summary of Contents for MicroMetl ECH-SRTCB-DC

  • Page 1 Economizer ECH-SRTCB-DC Install Guide Foremost HVAC Accessory Manufacturer...
  • Page 2 Table of Contents Topic Topic Page Number Page Number General Install Instructions Siemens Wiring Diagram Siemens Manual...
  • Page 3 Unpack and inspect economizer contents from carton. Contact alert symbol . When you see this symbol on the unit and in ¡ MicroMetl immediately if any parts are missing or damaged. instructions or manuals, be alert to the potential for personal injury. IMPORTANT NOTE: Siemens...
  • Page 4 CTB (Central Terminal Board) or Centrifugal Supply Blower then you must purchase a different harness Small Cabinet Legacy units with Central Terminal Board (CTB) (MicroMetl P/N 9962-2020). The harness that is factory RGH/RAH 036-060 attached to the Siemens controller must be removed and the RGS/RAS 036-072 9962-2020 harness attached per the QR Code scan.
  • Page 5 MicroMetl Since 1965 ACCESSORIES LIST - INSTALLATION The Economizer system has several field-installed accessories available to optimize performance. Refer Step 1: to Table 6 for authorized parts and power exhaust descriptions. Step 2: Table 6 —Economizer Field-Installed Accessories See Figure 1.
  • Page 6 Figure 5 – Mount Controller Assembly in Unit Central Terminal Board (CTB) or Centrifugal Supply Blower then you must purchase a different harness (MicroMetl P/N 9962-2020). The harness that is Control Box next to Units with a UCB factory attached to the Siemens controller must be removed and the 9962-2020 harness.
  • Page 7 MicroMetl Since 1965 Figure 6 – Unplug ECON plug from Unit Step 9: Unplug the 12-pin male ECON plug currently connected to the top left plug on the Unit Control Board (UCB) and attach the 12-pin male plug labeled ECON from the Siemens controller to the UCB board port labeled ECON.
  • Page 8 ISO 15.0 or later). You will need to purchase a 9901-1619 Siemens WLAN Stick (P/N 9901-5057 from Micrometl or P/N POL903.00 from Siemens). Once you have the WLAN Stick and have downloaded the Siemens app "Climatix", you will be able to set up your economizer following the configurations on your device.
  • Page 9 MicroMetl Since 1965 Step 18: Attach O/A panel as shown in Figure 13, use sheet metal screws no longer than #10-16 5/16” – 11 needed. Economizer is still sitting on R/A cover in unit, no fasteners needed. Step 19: Lift economizer so I.D. of economizer matches I.D. of economizer cut out in panel.
  • Page 10 MicroMetl Since 1965 Step 24: Relief is field installed on R/A duct work. Use #10-16 5/16” sheet metal screws. Make sure its watertight. Figure 16 – Filler Panel Not Used for Chassis 1 Install on duct work. **Duct work not shown** Figure 15 –...
  • Page 11 MicroMetl Wiring Diagram Supplement For Installing Siemens POL224.00 Economizer on Unit with Vane Axial Indoor Fan (with Unit Control Board HK50AA055 or HK50AA058) Since 1965 ECONOMIZER RETURN CHAMBER INDOOR BLOWER SECTION UNIT CONTROL BOX COMPARTMENT 9901-1619 9901-1619 Dry Bulb Outside...
  • Page 12 MicroMetl Wiring Diagram Supplement For Installing Siemens POL224.00 Economizer on Unit with Central Terminal Board Since 1965 ECONOMIZER RETURN CHAMBER INDOOR BLOWER SECTION UNIT CONTROL BOX COMPARTMENT 9901-1619 9901-1619 9962-2021 SRT 9962-2045 MRT Parts bag 9901-3535 Enthalpy Outside Air Sensor “ECON”...
  • Page 13 Siemens Actuator DIP Switch Functionality GMA 151 GMA 156 FEATURES 2-10Vdc with signal inversion  Economizer applications  4-20mA applications  987-105 GMA 151.1PRHEEM GCA161.1P Rotary angle direction Self-adaptation to mechanical range Positioning control signal 2-10 or 0-10 Positioning signal. Turn on or off capability to adjust offset/span.
  • Page 14 Refer to economizer wiring diagram and DCV instructions if demand control ventilation (CO2 sensor) is used. CO2 sensor California’s Title 24 code requires a high temperature limit setting will wire into the AUXAI connection at the Siemens controller. If for all dry bulb outside air economizer change over. The a field installed CO2 sensor is connected to the economizer temperatures vary by the region within California.
  • Page 15 MicroMetl Since 1965 Table of Contents Interface Overview ............................2 Powering & LED indication ........................2 User interface ............................3 Menu Structure ............................4 Functions ..............................5 Free cooling economizing ......................... 5 Default hysteresis settings ........................6 Damper modulation during free cooling ..................6 Location-based shutoff setpoints ..................
  • Page 16 Interface Overview Powering the Economizer Controller Connect a 24 Vac external power supply source to the following terminals to power the Economizer Controller. Power LED Indication No. Description Free Cooling LED Sensor LED DAC LED LED Indication Status Free Cooling Sensor LED DAC LED Commissioning mode...
  • Page 17 Status Free Cooling Sensor LED DAC LED Humidity sensor error Yellow On sensor error LED Off Air temperature failure/fault Red On Excess outdoor air Red Blinking Damper working ok Green On Damper stalled Red On Damper slippage Red Blinking Actuator alarm is reported Fast Red Blinking Terminal ACT-FB is LED Off...
  • Page 18 Menu Structure Menus are displayed in the Economizer Controller as per categories. There are eight first-level menus, each of which is represented by a number at the beginning of the line on the LCD. Pressing Enter + Up or Down can toggle between different first-level menus.
  • Page 19 Functions Free Cooling Economizing Free cooling uses unconditioned outside air to cool the space directly. The Economizer Controller enables or disables free cooling after it judges which control mode is active. It also uses hysteresis to ensure a smooth switchover. Depending on the sensors that are used, there are four different control modes.
  • Page 20 Default hysteresis setting Hysteresis setting (DB) between OAT and temperature shutoff setpoint defaults to 2 °F (non-changeable). The temperature shutoff setpoint decides when to disable free cooling when the outside air temperature increases. However, once free cooling is disabled after the increased temperature is higher than the temperature shutoff setpoint, the hysteresis setting decides when to enable free cooling.
  • Page 21 Cooling Stage Operation The Economizer Controller accepts inputs for 1-, 2- and 3-stage cooling inputs, and reroutes to the RTU through the relay connection Y1, Y2 and AUX1/AUX2. The operation of the cooling stages is determined by the availability of Free Cooling provided by the economizer operation mode.
  • Page 22 If Y2-Input is called too, the controller increases fan speed to Speed High and starts fan delay (2FAN DLY) time. After the delay time runs out, the controller starts Y1-Output. If Y3-Input is called too, the controller increases fan speed to Speed High and starts fan delay (2FAN DLY) time.
  • Page 23 Multi-Speed Fan Support The Economizer Controller supports connection to 2- and 3-speed fans. When the unit is equipped with a multi-speed fan, the damper responds to multiple fan speeds via multiple minimum positions (MIN POS) to keep minimum airflow. A multi-speed fan is not controlled by the Economizer Controller but an external logic board.
  • Page 24 If a single-speed fan connects to the Controller, the fan speed is Spd H. The damper position is PosH. 1-stage Cooling 2-stage Cooling 3-stage Cooling 1-speed Fan Spd H (regardless of Spd H Spd H (regardless cooling demand, (regardless of of cooling demand, OCC=Yes) cooling demand,...
  • Page 25 3 PosH = Damper MIN POS for High-Speed Fan. If DCV (demand control ventilation) is enabled, each fan speed corresponds to two damper position ventilation setpoints (VENT MIN, VENT MAX), e.g., PosL corresponds to 2VENTMIN L... 2VENTMAX L. 1-stage Cooling 2-stage Cooling 3-stage Cooling 1-speed Fan...
  • Page 26 Variable-Speed Fan Support Once a variable-speed fan is configured with the Economizer Controller via terminal VFD 0-10 and the Fan Configuration in Climatix Mobile or '6FAN' in the inbuilt menu is configured as 'VFD FAN', the controller can control the fan speed following the logic below: OCC Y1 Y2 Y3 6FAN VFD Speed...
  • Page 27 Cooling Delay via Increasing Fan Speed If there is cooling demand while outside air is suitable for economizing, the Economizer Controller tries to increase fan speed to maximize the use of outside air first. If the cooling demand is not reached within a set time, mechanical cooling will be enabled.
  • Page 28 Setup and Configuration Before setup and configuration, it is recommended to obtain some location-based values such as shutoff points or utilize the location services in the Climatix mobile application. Set up and configure the Economizer Controller before putting it into usage. This can be accomplished by using the Climatix Mobile app or the inbuilt display.
  • Page 29 Parameter Description Value 1AUX1-O Aux1-Out signal Dynamic item. Appears only if Aux1-Out terminal is configured. 1AUX2-I Aux2-In signal Dynamic item. Appears only if Aux2-In terminal is configured. 1AUX2-O Aux2-Out signal Dynamic item. Appears only if Aux2-Out terminal is configured. 1COMP STAGE Indicates compressor current stage.
  • Page 30 Parameter Description Value 1VFD SPD Indicates the current VFD fan speed. Dynamic item. Appears only if '6FAN' is configured as 'VFD FAN'. 100% 1ACT OUT Indicates current position of damper actuator in V. The corresponding detected value is 1ACT FB Indicates feedback signal of damper actuator in V.
  • Page 31 Basic Settings Note: Editable in 1TOP LEVEL. Do not have to use '5ENTER CONFIG?' to change values. Parameter Description Range Default 2TEMP OFF Temperature shutoff setpoint. Automatically obtainable if a 48...80 °F; 63 ° F smartphone or tablet is connected to the network, a WLAN increment by 1 stick is plugged into the Economizer Controller and the mobile application is installed on the phone or tablet.
  • Page 32 Parameter Description Range Default 2VENTMIN H DCV minimum position when fan runs at a high speed. 2...10V; 2.3V Dynamic item. Appears only if a CO sensor is configured increment by 0.1 and '6FAN' is configured as '1SPEED', '2SPEED', '3SPEED' or 'VFD FAN'. CFM COMM Air Flow Chart.
  • Page 33 Advanced Settings Parameter Description Value/Range Default 3FREEZE POS Anti-freeze protection damper position (closed or minimum) when the Controller is under MAT-based anti-freeze protection. 3STG3 DLY Highest stage cooling delay time 0...240m; increment by 5 3SD ACT POS Damper position during shutdown (open or closed) 3DIF T LOC MAT sensor location: ●...
  • Page 34 Alarms Parameter Description NO ALARM No alarm is activated. 4MAT SEN MAT/LAT sensor has failed, gone out of range or become disconnected. ALARM 4CO2 SEN sensor has failed, gone out of range or become disconnected. ALARM 4OAT SEN OAT sensor has failed, gone out of range or become disconnected. ALARM 4OAH SEN OAH sensor has failed, gone out of range or become disconnected.
  • Page 35 I/O Configuration Parameter Description Value Default 6OCC Configures if occupancy status receives signal from the T-STAT T-STAT connected thermostat or is displayed as 'ALWAYS' in the ALWAYS Economizer Controller. 6AUX1-I Auxiliary DI-1. Configurable as: NONE ● None SHUTDWN ● Cooling stage 3 (Y3) from thermostat PREOCC ●...
  • Page 36 Parameter Description Value Default 6AUX-AI2 Choose 'ACT FB' if feedback signal is available from the ACT FB ACT FB connected damper actuator. Otherwise, choose 'NONE'. NONE 6AUX-AO Choose 'VFD' if a VFD (Variable Frequency Drive) is NONE NONE connected to the Economizer. Otherwise, choose 'NONE'. 6Y2O Choose 'COOL 2' if Cooling Stage 2 is available (another COOL 2...
  • Page 37 Test Parameter Description 7DAMPER MIN Press Enter to test if the Economizer Controller can drive damper to minimum position. 7DAMPER Press Enter to test if the Economizer Controller can drive damper to 100% Closed. CLOSE 7DAMPER OPEN Press Enter to test if the Economizer Controller can drive damper to 100% Open. 7DAMPER ALL Press Enter to perform all the above tests and then drive damper to 100% Closed.
  • Page 38 Troubleshooting Symptom Reason Solution The Economizer No input power Use a multi-meter to check if there is 24 Vac +/- 25% (18 Controller/ Mechanical Vac - 30 Vac) at the POWER terminals. If there is no voltage Cooling is not or if the voltage is significantly low, check the transformer operating output voltage at the RTU.
  • Page 39 Symptom Reason Solution DAC LED is OFF Terminal ACT-FB is Check if the feedback signal is under range or over range; configured but no check if ACT-FB is faulty or not. available feedback signal The controller has no Shutoff SP setting error The shutoff temperature and/or enthalpy setpoint is alarm, but the Free incorrectly set up.

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