TEC Controller Unit Conditioner - VAV Pressure Dependent Cooling or Heating, Application 2040 Application Note 140-1126 2014-05-01 Building Technologies
Table of Contents Overview ............................................................................................................................. 4 Hardware Inputs .................................................................................................................. 5 Hardware Outputs ................................................................................................................ 5 Ordering Notes .............................................................................
Overview Hardware Inputs Overview In Application 2040, the controller modulates the supply air damper of the terminal box for cooling and heating. In order for it to work properly, the central air-handling unit must provide cool supply air in the cooling mode and warm supply air in the heating mode. Application 2040 – VAV Pressure Dependent Cooling or Heating Control Diagram. 4 Siemens Industry, Inc.
Overview Hardware Inputs Application 2040 Control Schedule. NOTES: 1. See Control Temperature Setpoints. 2. See Heating/Cooling Switchover. Hardware Inputs Analog Duct temperature sensor Room temperature sensor Room temperature setpoint dial (optional) Digital Night mode override (optional) Wall switch (optional) Hardware Outputs Analog None Digital Damper actuator 5 Siemens Industry, Inc.
Overview Ordering Notes Ordering Notes 540-110N Siemens TEC Unit Conditioner Controller 6 Siemens Industry, Inc.
Sequence of Operation Control Temperature Setpoints Sequence of Operation The following paragraphs present the sequence of operation for the Siemens TEC Unit Conditioner (Fan Coil) Controller. Control Temperature Setpoints This application has a number of different room temperature setpoints (DAY HTG STPT, NGT CLG STPT, RM STPT DIAL, etc.). The application actually controls using the CTL STPT.
Sequence of Operation Room Temperature and CTL TEMP CTL STPT is calculated as follows: With Deadband Disabled: CTL STPT = Dial value With Deadband enabled in Heat Mode: CTL STPT = Dial value – 0.5 ∗ Deadband (limited between the value of RM STPT MIN and RM STPT MAX) With Deadband enabled in Cool Mode: CTL STPT = Dial value + 0.5 ∗ Deadband (limited between the value of RM STPT MIN and RM STPT MAX). NOTE: If RM STPT DIAL is failed, it maintains the last known value.
Sequence of Operation Day and Night Modes Day and Night Modes The day/night status of the space is determined by the status of DAY.NGT. The control of this point differs depending on whether the controller is monitoring the status of a wall switch or if the controller is connected to a field panel. When a wall switch is physically connected to the termination strip on the controller DI 2 (see the Control Diagram(s), and WALL SWITCH = YES, the controller monitors the status of DI 2.
Sequence of Operation Control Loops Control Loops The Siemens TEC Unit Conditioner (Fan Coil) Controller is controlled by two Proportional, Integral, and Derivative (PID) temperature loops. The two temperature loops are a cooling loop and a heating loop. The active temperature loop maintains room temperature at the value in CTL STPT. See Control Temperature Setpoints [➙ 7]. Cooling Operation In cooling mode, the controller uses CTL STPT and CTL TEMP as inputs for the cooling loop.
Sequence of Operation Application Notes Application Notes If temperature swings in the room are excessive or there is trouble maintaining the setpoint, the cooling loop, the heating loop, or both need to be tuned. The controller as shipped from the factory keeps all associated equipment OFF. See the Start-up Procedures document for how to release the controller and its equipment to application control.
Sequence of Operation Wiring Diagram Application 2040 - Variable Air Volume Pressure Dependent Cooling or Heating. 12 Siemens Industry, Inc.
Application 2040 Point Database Application 2040 Point Database Point Number Descriptor Factory Default (SI Units)2) Eng Units (SI Units) Slope (SI Units) Intercept (SI Units) On Text Off Text 1 CTLR ADDRESS 99 -- 1 0 -- -- 2 APPLICATION 2090 -- 1 0 -- -- {04} ROOM TEMP 74.0 (23.44888) DEG F (DEG C) 0.25 (0.14) 48.0 (8.88888) -- -- {05} HEAT.COOL COOL -- -- -- HEAT COOL 6 DAY CLG STPT 74.0 (23.44888) DEG F (DEG C) 0.25 (0.14) 48.0 (8.
Application 2040 Point Database Point Number Descriptor Factory Default (SI Units)2) Eng Units (SI Units) Slope (SI Units) Intercept (SI Units) On Text Off Text {48} DMPR COMD 0 PCT 0.4 0 -- -- {49} DMPR POS 0 PCT 0.4 0 -- -- 51 MTR 1 TIMING 130 SEC 1 0 -- -- {52} MTR 2 COMD 0 PCT 0.4 0 -- -- {53} MTR 2 POS 0 PCT 0.
Issued by Siemens Industry, Inc. Building Technologies Division 1000 Deerfield Pkwy Buffalo Grove IL 60089 Tel. +1 847-215-1000 Document ID 140-1126 Edition 2014-05-01 © 2014 Copyright Siemens Industry, Inc. Technical specifications and availability subject to change without notice.
