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Supply Air Temperature Control with Modulated
File Name
Path Name
Main Function
Accessories
©
1990 Johnson Controls, Inc.
Order No. 636-128
Dampers and Modulated Cooling
Temperature control of the supply (discharge) air through sequencing
modulated dampers and modulated cooling
DMCLM.CMP
The following DOS path name indicates the location of the compound:
<FMS>\APPS\HVAC\CONTROL\TEMP-CTL\DMCLM.CMP
Temperature control of the supply (discharge) air through sequencing
modulated dampers and modulated cooling. This compound can be
used to control and sequence the following:
•
modulated dampers, e.g., a set of outdoor air/return air mixing
dampers
•
modulated cooling devices, e.g., a chilled water valve
Other compounds can be connected to the DMCLM compound's inputs to
perform the following functions:
•
setpoint control
•
fan status control
•
independent lockout of cooling control
•
dehumidification through the cooling devices
When used with the damper logic compound (DMPLOGIC), inputs are
provided for these additional features:
•
independent lockout of dampers
•
proportional mixed air low temperature limit protection
•
economizer control of the damper's maximum position
•
ramped startup of dampers
Metasys Network Technical Manual 636
Air Handlers Section
Technical Bulletin
Issue Date 0590
1
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Summary of Contents for Metasys FAN 636
- Page 1 Metasys Network Technical Manual 636 Air Handlers Section Technical Bulletin Issue Date 0590 Supply Air Temperature Control with Modulated Dampers and Modulated Cooling Temperature control of the supply (discharge) air through sequencing modulated dampers and modulated cooling DMCLM.CMP File Name...
- Page 2 The following compounds also provide temperature control through Alternate Schemes modulated dampers, heating devices, or cooling devices. • CLM compound—modulated cooling control • DM compound—modulated damper control • HTM compound—modulated heating control • HTMCLM compound—sequential control of modulated heating and modulated cooling control •...
- Page 3 • You can find important instructions and guidelines for using Guidelines compounds in How to Use the Metasys GPL HVAC Library, located at the beginning of the App. Notes: GPL HVAC Library section. • For information on the definition and the initial configuration of the objects and the function blocks, use GPL to examine this compound.
- Page 4 I/O Requirements Table 2: I/O Requirements Input Requirements Name Of Block Type Of Engineer Req? Range Default Value Description Data Units SA-T Analog DEG F Supply air temperature SETPOINT Analog DEG F Setpoint 55°F (13°C) STATUS Binary Fan status CLG-ENA Binary Cooling enable DEHUMID...
- Page 5 The template for the DC-CTRL (PIDL object) includes screens (Figure 1 Port and Figure 2) for establishing the port definition requirements. Requirements: DC-CTRL Object PID LOOP OBJECT (PIDL) PORT DEFINITION INPUT 1 INPUT 4 Enter the system name 0.000000 Scalar 1.000000 Scalar of the AI object that...
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Page 6: Port Requirements
The pertinent screen for port definition requirements is shown below. Port Requirements: CLG-PTP Object PID LOOP OBJECT (PIDL) OUTPUT DEFINITION OUTPUT 1 OUTPUT 5 System Name System Name Enter the system name Object Name CLG-AOD Object Name of the PIDL object Attribute Attribute VALUE... - Page 7 Air Handlers—Supply Air Temperature Control with Modulated Dampers and Modulated Cooling 7...
- Page 8 Notes Controls Group FAN 636 507 E. Michigan Street Metasys Network Technical Manual P.O. Box 423 Revision Date 0590 Milwaukee, WI 53201 Printed in U.S.A. 8 Air Handlers—Supply Air Temperature Control with Modulated Dampers and Modulated Cooling...
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