Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Subscribe to Our Youtube Channel
Related Manuals for Emerson MultiFlex RTU
Summary of Contents for Emerson MultiFlex RTU
- Page 1 MultiFlex RTU Rooftop Controller Installation and Operation Manual 026-1706 Rev 3...
- Page 3 The information contained in this manual has been carefully checked and is believed to be accurate. However, Emerson assumes no responsibility for any inaccuracies that may be contained herein. In no event will Emerson be liable for any direct, indirect, special, incidental, or consequential damages resulting from any defect or omission in this manual, even if advised of the possibility of such damages.
-
Page 5: Table Of Contents
2.3.1. Choosing Transformer Sizes ..........................4 2.3.2. MultiFlex RTU Power Wiring..........................4 2.3.2.1. New-Style MultiFlex RTU Boards (with Isolated Power Supply) ..................4 2.3.2.2. Old-Style MultiFlex RTU Boards No Isolated Power Supply) ..................5 2.3.3. Wire Types and Maximum Distances........................6 2.4. - Page 6 ALVE ONTROL 6.8. S ............................21 TAND LONE PERATION 6.9. S ..............................22 ENSOR AILURES 7 THE MULTIFLEX RTU HAND-HELD INTERFACE................... 23 7.1. RTU H ......................23 ERMINAL TATUS CREENS 7.2. RTU M ............................... 24 7.3. S ................................24 TATUS 7.4.
-
Page 7: Overview Of The Multiflex Rtu
810-3062) is a “smart” combination input/output board designed to control package rooftop Control HVAC units. The MultiFlex RTU is capable of The RTU can control a rooftop unit controlling heat and cool stages, fans, independently without the need of a central humidification and dehumidification devices, controller (such as Emerson’s Einstein BX... -
Page 8: Mounting And Powering
Figure 2-1 - MultiFlex Snap-Track Mounting Figure 2-2 provides mounting dimensions for the MultiFlex board. Figure 2-2 - MultiFlex Board Dimensions 2 • MultiFlex RTU Operator’s Guide 026-1706 Rev 3... -
Page 9: The Plug-In Output Board
The additional board makes the MultiFlex RTU boards considerably taller than the MultiFlex 16 2.2. The Plug-In Output Board and other Emerson I/O boards. If you will be mounting these boards in an enclosure, the board will need at least 2.5" of clearance between the base board and the panel door. -
Page 10: Choosing Transformer Sizes
MultiFlex Board (Top Left Corner) 2.3.2. MultiFlex RTU Power Wiring The MultiFlex RTU boards do not use a center tap. Instead, the 0V terminal on the board should Figure 2-4 - New-Style vs. Old-Style MultiFlex Board be connected to a separate Earth ground. -
Page 11: Old-Style Multiflex Rtu Boards No Isolated Power Supply)
MultiFlex board can be connected to any of Transformers With a Center Tap the center-tapped transformers mentioned in In addition, the MultiFlex RTU boards can be Table 2-2, provided you follow the following powered by one of the 50VA or 75VA... -
Page 12: Wire Types And Maximum Distances
(VA is the total VA rating of the I/O boards) board. For example, if you had an 80 VA load: In addition, the old-style MultiFlex RTU boards 14 AWG: 29 ft. (rounded down) can be powered by one of the 50VA or 75VA 18 AWG: 11 ft. -
Page 13: The Multiflex Rtu Battery And Battery Enable Jumper
Enable Jumper The RTU uses battery-backed memory to store setpoints and the current time and date. The battery for the MultiFlex RTU is located either underneath the output plug-in board (for old- Figure 2-8 - Enable Battery Jumper on MultiFlex Board... -
Page 14: The I/O Network
Einstein and REFLECS site controllers. Technicians who are familiar with Emerson’s previous generation 16AI, 8IO, and ARTC boards will find the network setup procedure for the MultiFlex RTU boards to be very much the same. 3.1. Wiring Types Figure 3-1 - I/O Network Configurations 3.1.2. -
Page 15: Numbering The Multiflex Rtu
Either may be used — refer to your site 3.1.2.1. Numbering the MultiFlex RTU controller’s user manual for the baud rate The MultiFlex RTU is a unique board type on recommendation (currently 9600 baud for both the RS485 Network by the Emerson controllers. REFLECS and Einstein controllers). -
Page 16: Rtu Input And Output Setup
Configurable in RTU software (see Section 4.1.2., Auxiliary Input Types) Figure 4-1 - MultiFlex RTU Input Locations Table 4-1 - RTU Default Inputs The MultiFlex RTU has pre-defined locations for connection to all sensors that are typically 4.1.2. Auxiliary Input Types present for a rooftop unit. -
Page 17: Wiring Sensors To The Multiflex Rtu
Table 4-2 - Auxiliary Input Types sensor. This sensor’s value will be combined in some 4.1.3. Wiring Sensors to the way with the value of the MultiFlex RTU SPACE TEMP input to determine the control temperature. Wiring an input to the input points on a... -
Page 18: Input Type Dip Switches
+5VDC points. See Figure 4-5 for the location position. of these points. (ON) (OFF) +5 VDC Figure 4-3 - Input Type Dip Switches for RTU Board +12 VDC Figure 4-5 - Input Board Power Sources 12 • MultiFlex RTU Operator’s Guide 026-1706 Rev 3... -
Page 19: Current Ratings For On-Board Power Sources
AC1 and AC2. This can only be done with sensors that keep the Figure 4-6 - MultiFlex RTU Output Locations 24VAC signal isolated from its DC output signal (such as Emerson’s Dewpoint Probe). If the... -
Page 20: Multiflex Rtu Auxiliary Output Types
Table 4-3 - RTU Default Outputs 4.2.3. Wiring Outputs to Points 4.2.2. MultiFlex RTU Auxiliary The MultiFlex RTU has Form C relay contacts. Output Types Figure 4-7 shows how to wire the three-terminal Output points #6 and #7 on the RTU board are Form C contact. -
Page 21: Output Fail-Safe Dip Switches
Table 4-5 and Table 4-6 show how the fail-safe 4.2.4. Output Fail-Safe Dip switch and Form C contacts should be Switches configured based on how you want the output to When a controller calls for a MultiFlex relay perform during both normal operation and output to be ON, it sends a command to the during network/power loss. -
Page 22: Analog Outputs
4.3. Analog Outputs Figure 4-8 - MultiFlex RTU Analog Output Locations The MultiFlex RTU analog outputs are +0-+10VDC points used for controlling variable-position economizers and variable- speed fans. The maximum output current for each point is 10 milliamps. Unlike most of the RTU inputs and outputs, the two analog points are not pre-defined. -
Page 23: Board Status Leds
If this light is dark, the board has likely lost power. 5.3. The Code A LED The Code A LED on the MultiFlex RTU 5.2. Tx and Rx LEDs indicates activity on the Hand-Held Terminal port. When this LED is not blinking, it means no The Tx and Rx LEDs indicate when the HHT is plugged into the board. -
Page 24: The Codeb Led
OFF. The definition of ON and OFF in this case is determined by the position of the fail-safe dip switch (see Table 4-5 and Table 4-6). 18 • MultiFlex RTU Operator’s Guide 026-1706 Rev 3... -
Page 25: Software Overview
Software Overview 6.2.1. Setpoints There are two active setpoints in an RTU: a cooling setpoint and a heating setpoint (both of 6.1. Introduction to Zone which are supplied by the zone from the Einstein or BCU). When the input rises above the cooling Control setpoint, cooling mode begins, and when the RTUs are designed to be grouped together in... -
Page 26: Fan Control
Before economization may occur, the zone must determine when the outside air conditions are favorable for economization. If economization is OK, it sends an ENABLE signal to its AHU 20 • MultiFlex RTU Operator’s Guide 026-1706 Rev 3... -
Page 27: Analog Economizers
Zone applications. For as long as the ENABLE signal lasts, AHU Zone applications treat the 6.7. Reversing Valve Control economization dampers as if they are preliminary cool stages; if cooling is needed, the If reversing valves are used, the AHU Zone dampers will open and economization will application will not be allowed to bring on stages of heat begin. -
Page 28: Sensor Failures
Comparison” is the chosen method of economization enabling. In this case, economization will be disabled for both normal and stand-alone operation. A failure alarm will be generated and sent to the Alarm Advisory Log. 22 • MultiFlex RTU Operator’s Guide 026-1706 Rev 3... -
Page 29: The Multiflex Rtu Hand-Held Interface
HHT. To change the value in a field, press the RIGHT arrow key. A cursor will appear in the screen next to the first changeable field in the display. Use the UP and RTU Hand-Held Terminal Status Screens The MultiFlex RTU Hand-Held Interface • 23... -
Page 30: Rtu Main Menu
Make-Up Air: Whether the make-up air strategy is active or inactive. Timer: Number of minutes left on the Make-Up Air timer. The number in parenthesis is the defined Make-Up Air setpoint. Dampr Offset: Percentage of damper offset during makeup mode. 24 • MultiFlex RTU Operator’s Guide 026-1706 Rev 3... -
Page 31: Control Menu
Occupied and unoccupied summer and winter setpoints may be viewed and changed at this screen. Deadbands, on delays, and off delays for heating and cooling setpoints may be viewed and changed at this screen. Control Menu The MultiFlex RTU Hand-Held Interface • 25... - Page 32 RTU analog outputs modulate economizer dampers and fans by sending appropriate voltages to the analog economizers. By default, the outputs will modulate from 0-10VDC. To specify a different voltage range, enter values in the MINV and MAXV fields. 26 • MultiFlex RTU Operator’s Guide 026-1706 Rev 3...
- Page 33 Reset Setpts message and pressing the dash key. The letters “CL” will appear. To confirm the alarm reset, press ENTER; to cancel the runtime reset, press the period “.” key. Control Menu The MultiFlex RTU Hand-Held Interface • 27...
- Page 36 The contents of this publication are presented for informational purposes only and they are not to be construed as warranties or guarantees, express or implied, regarding the products or ser- vices described herein or their use or applicability. Emerson reserves the right to modify the designs or specifications of such products at any time without notice. Responsibility for proper selec-...
Need help?
Do you have a question about the MultiFlex RTU and is the answer not in the manual?
Questions and answers