Johnson Controls Metasys DX-9100 Service manual

M-Applications 653
Metasys Ventilation Controller Section
Issue Date 1000
© 2000 Johnson Controls, Inc. www.johnsoncontrols.com
Part No. 24-8395-26 Rev. —
Code No. LIT-653425
TECHNICAL BULLETIN
Metasys Ventilation Controller Application
for the DX-9100
Metasys Ventilation Controller Application for the DX-9100 .............3
Introduction........................................................................................................*3
Key Concepts...................................................................................................... 5
Johnson Controls CO2Concentration Samplers............................................................ *5
MVC-2000-1 Package ................................................................................................... *5
Universal Packaging Module (UPM) ............................................................................... 6
DX-9100 ........................................................................................................................*7
CO2Sensor................................................................................................................... *7
Air Valve ......................................................................................................................... 8
Air Pump......................................................................................................................... 8
Air Filter ......................................................................................................................... *8
Return, Supply, and Outdoor Air Ports............................................................................ 8
Sample System ............................................................................................................. *9
HVAC System Requirements........................................................................................ 10
Location Considerations ............................................................................................... 10
Procedure Overview ........................................................................................*12
Detailed Procedures ......................................................................................... 13
Installing a UPM........................................................................................................... *13
Installing Air Sampling Devices and Tubing .................................................................. 14
Trending Data.............................................................................................................. *15
Checking the Solenoid Valves ..................................................................................... *16
Calculating the OA Flow .............................................................................................. *16
Checking the Controller Application ............................................................................. *17
Reloading the Controller Application ............................................................................ *17
* Indicates those sections where changes have occurred since the last printing.

Metasys Ventilation Controller
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Metasys Ventilation Controller Application for the DX-9100 3
Metasys Ventilation Controller
Application for the DX-9100
Introduction
A Johnson Controls Building Automation System (BAS), along with
the Metasys® Ventilation Controller (MVC) 2000-1 Multipoint Gas
Concentration Sampler, can provide building managers with a
cost-effective method of addressing the Ventilation Rate Procedure
found in ASHRAE (American Society of Heating, Refrigeration, and
Air Conditioning Engineers) Standard 62-1999. The MVC-2000-1 is
used to implement the Metasys Ventilation Controller Application
(MVCA) that allows a facility manager to:
•monitor the flow of outdoor air into a building, using a patented
tracer gas method
•control the flow of outdoor air into a building according to
ASHRAE guidelines, e.g., 20 cubic feet per minute (cfm)/person
for office spaces
•document the ventilation flow for future reference, which enables
the facility manager to compare the readings with established state,
local, federal, or ASHRAE guidelines
•perform CO2high-limit control (override of ventilation controller)
in response to greater than expected occupancy in critical areas
such as conference rooms
•view CO2concentrations in supply, return, and outdoor air at the
workstation
•diagnose the control system, since deviations in trended CO2
readings can suggest problems with the Heating, Ventilating, and
Air Conditioning (HVAC) equipment
•set alarms based on CO2levels exceeding a user-defined
maximum or differential

Metasys Ventilation Controller
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This technical bulletin describes how to:
•install a Universal Packaging Module (UPM)
•install air sampling devices and tubing
•trend data
•check the solenoid valves
•calculate the Outdoor Air (OA) flow
•check the controller application
•reload the controller application

Metasys Ventilation Controller Application for the DX-9100 5
Key Concepts
Johnson Controls CO2Concentration Samplers
Johnson Controls offers two 3-point, multiplexed CO2measurement
devices, as shown in Table 1.
Table 1: Attributes of the MVC-2000-1
Product Intended Use Enclosure Controller Software Links
MVC-2000-1 3-point,
multiplexed CO2
measurement
UPM
Enclosure
One
Metasys
Extended
Digital
Controller
(DX-9100)
GX-9100 Application
for MVC is
pre-installed in the
DX-9100.
Metasys
Supervisory
Controller and
workstation links
possible but not
required.
This document gives procedures that are unique to the MVC-2000-1
and its components as shown in Figure 1. Refer to existing product
documentation for standard procedures involving these components.
MVC-2000-1 Package
Many of the components of the MVC-2000-1 package are
Johnson Controls products, including the:
•UPM
•DX-9100, Version 2.4 or later
•GX-9100 Configuration Tool Software for the DX-9100
•V11HGA-100 3-way Solenoid Air Valve
•A-4000-137 Air Filter

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Mvc2000B
DX-9100
3-Way
Valves
CO
Sensor
2
Ports for Outside,
Return, and Supply Air
Air Filter
Air Pump
Figure 1: Components of an MVC-2000-1
Universal Packaging Module (UPM)
The MVC-2000-1 product line utilizes the EN-EWC35-0 UPM. Each
EWC number ends with a “5,” which means that the UPM enclosure
with cover also comes equipped with a transformer and a power box.
Refer to the UPM literature for the following UPM procedures:
•engineering
•installation, which includes:
a. mounting
b. landing conduit
c. power connections
d. grounding and bonding
•commissioning

Metasys Ventilation Controller Application for the DX-9100 7
DX-9100
The DX-9100 is a controller manufactured and marketed by
Johnson Controls. The Metasys Ventilation Controller Application of
the GX-9100 Software Tool is used to program the DX-9100.
DX-9100 Hardware
The MVC-2000-1 product utilizes one DX-9100. The DX-9100 is
factory installed in the MVC-2000-1.
!
CAUTION: Do not use any additional inputs or outputs on
the DX-9100, which is performing the outdoor
air flow calculations. The GX-9100 software
uses the full capabilities of the controller and
adding additional inputs or outputs risks
overburdening the system.
GX-9100 Software Configuration Tool
To use the MVCA, it is necessary to know GX-9100 basics such as:
•opening a file
•downloading a file
•commissioning a DX-9100
These procedures are contained in the GX-9100 Software
Configuration Tool User’s Guide (LIT-6364060).
GX-9100 Application for MVC
The MVCA is factory downloaded into the DX-9100.
For an explanation of the GX-9100 application for MVCA, refer to the
Metasys Ventilation Controller Application (MVCA) Application Note
(LIT-653435).
CO2Sensor
Each MVC-2000-1 contains a single CO2sensor. It is used to sense the
CO2levels in three distinct airstreams:
•supply air
•return air
•outdoor air
This is achieved through the use of two 3-way pneumatic valves and
the associated multiplexing control. Three separate pneumatic lines
are multiplexed into the single CO2sensor.

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The CO2sensor is factory mounted and wired in the MVC-2000-1
enclosure. Since it is also factory calibrated, there is no need to
calibrate the CO2sensor before starting the MVCA.
Air Valve
Each MVC-2000-1 contains two solenoid air valves. These
two V11HGA-100 3-way solenoid air valves switch the input source
of sampled air from one of three sampling tubes to the CO2sensor.
This allows samples from three different airstreams to be multiplexed
into a single CO2sensor.
The solenoid air valves have already been installed in the
MVC-2000-1 enclosure. Electrical power has been connected.
No installation or commissioning procedures are necessary for the air
valves. If a problem arises with this product, refer to the V11 Series
Three-Way Solenoid Air Valve Technical Bulletin (LIT-7171550X)
found in the Pneumatic Control Manual (FAN 717.1).
Air Pump
The MVC-2000-1 comes equipped with an air pump. The pump
maintains proper air flow between the air sampling points and the
CO2sensor regardless of duct static pressure. No installation or
maintenance procedures are required for the air pump. The air pump is
factory installed in the MVC-2000-1 enclosure. If the pump should
fail, replace it with a 0.8 liters/minute (L/min.) pump. Eight L/min is
equivalent to 0.21 gallons/minute (gal/min).
Air Filter
Each MVC product contains an A-4000-137 air filter. This removes
particulate and moisture from the airstream, to prevent damage to the
CO2sensor. The A-4000-137 filter also inhibits contamination of the
pump and the CO2sensing chamber.
Inspect the air filter every few months. Replace the filter if a dark red
color appears on the outer surface, indicating oil or water
contamination.
Return, Supply, and Outdoor Air Ports
The return, supply, and outdoor air samples enter the UPM enclosure
through their respective ports.

Metasys Ventilation Controller Application for the DX-9100 9
Sample System
Figure 2 shows a sample system with an MVC-2000-1 connected to a
Metasys Supervisory Controller that supports the DX-9100 via an
N2 Bus. The Metasys Supervisory Controller is optional and the
workstation is only required for visual trending of data. Linked and
modulated outdoor air flow dampers and a supply air flow measuring
station are required parts of the system.
Supervisory
Controller
does data trending.
MVC-2000-1
VAV Air
Handling System
Supply Air Flow
Measuring Station
Coupled
Dampers
Workstation
Printer
archives and prints
trend data.
MVCAPB5
Calculates
outdoor air flow
and controls
the dampers.
Supply Air Flow
Multiplexed Samples
of Supply, Return,
Outdoor Air
Discharge Air Temperature
Mixed Air Damper Control
Supervisory
Controller
N2 Bus
Air Handling Unit
Controller
N2 Bus
Figure 2: Sample System Using MVC-2000-1
Connected to a Metasys Supervisory Controller

Metasys Ventilation Controller
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HVAC System Requirements
In order to achieve optimum performance from the application, the
following checklist must be used to evaluate the HVAC system prior
to installation. Refer to items that are appropriate to the installation. If
any items below are questionable, contact a Johnson Controls technical
support representative.
•Is the HVAC system in good working condition?
•Are all controls and controlled systems properly calibrated?
•Are all control loops working as they were commissioned?
•Is the HVAC system appropriately sized for the building it serves?
•Are the ducts sized properly for the air handling system?
•Are the dampers, linkages, and actuators in good operating
condition?
•Is the air measuring station in the supply air duct installed and
operating properly?
•Is the outdoor air intake free from the re-entrainment of exhaust
air?
•Is the outdoor air intake free from the entrainment of pollution
sources, e.g., carbon monoxide from trucks and buses?
Location Considerations
Consider the following factors when deciding where to mount the
MVC-2000-1 enclosure:
•Stability: The enclosure should be mounted to a flat, stable,
non-vibrating mounting surface (heavy-duty drywall or concrete)
where the unit will not be subjected to moisture accumulation or
drastic temperature variation.
•Ambient Operating Conditions: Temperature: 0 to 40°C
(32 to 104°F); humidity: 10 to 95% Relative Humidity (RH),
non-condensing.
!
CAUTION: Because it contains delicate sensing instruments,
the MVC should be located in an environment in
which the ambient temperature is normally above
5°C (40°F). The MVC is not designed to be located
on an exposed rooftop.