Operating Instructions

Chapter 1 – Product Overview
Hardware Inputs
6
Siemens Industry, Inc.
Owner's Manual, Apps 2920/2926
125-5109
2015-06-30
Chapter 1 – Product Overview
The LCM-OAVS Room Pressurization with Two Fast-acting Venturi Air Valves (One
Suppy, One Exhaust) and Hot Water Reheat is the Siemens Industry FLN controller
used in pressure independent Variable Air Volume applications. It provides Direct
Digital Control (DDC) for a number of applications.
 The controller can operate as an independent, stand-alone, DDC room controller or
it can be networked with a field panel.
 The controller provides all termination, input/output, system and local
communication connections.
 The controller hardware consists of the controller with cover and mounting bracket
(See Figure LCM-OAVS Room Pressurization with Two Fast-acting Venturi Air
Valves (One Suppy, One Exhaust) and Hot Water Reheat).
 The controller provides negative, positive, or neutral pressurization for laboratories
(using volumetric tracking) to control airflow into or out of the laboratory from
surrounding areas.
 Delivery of enough ventilation to the room to dilute air contaminants.
 Maintain the desired air temperature in the room.
The LCM is specifically designed to perform these functions in laboratories with VAV
fume hoods. This version of the LCM uses one supply duct with a reheat coil, one
exhaust duct and up to six fume hoods using an averaging and scaling module.
Pressurization is controlled by maintaining a selected difference between supply and
exhaust airflows and uses fast-acting electronic actuators (shipped separately) to
control the supply and exhaust Venturi air valves.
The LCM is equipped with ventilation and pressurization alarms that are designed to fit
into a safety program. When the ventilation system fails to function properly, the
controller can detect and indicate the alarm condition throughout the facility. The
controller can activate alarm devices in or near the room and broadcast that
information through the Building Automation System (BAS) to the people designated to
respond to the problem.
As part of a networked BAS, the LCM makes it possible for the maintenance staff to
monitor, troubleshoot and adjust laboratory HVAC operation remotely. The BAS can
collect and process data from the controller to generate longer-term records of
laboratory operation. These records can be used as part of a building quality
assurance program. Reports can also be tailored to serve as safety records, or for use
in energy accounting.
To help you make the best use of your energy budget; the LCM has features that
support reducing the ventilation rate during periods in which the laboratory is
unoccupied.
The Laboratory Room Controller with Venturi Air Valves and OAVS can be used to
control a lab room that has no supply air terminal box, or conversely, it can be used to
control a lab room without a general exhaust terminal box. See your local Siemens
Industry, Inc. representative for more information.
Configurations
The LCM is equipped to handle a variety of combinations of ventilation devices in one
room. Each controller in your system is initially set up to cover the equipment installed
at that time. Laboratory ventilation systems are known to change from time to time,
usually as exhaust devices are added, or removed. This section explains various ways
your LCM may be adapted to accommodate changes in the ventilation equipment.
Contact your local Siemens Industry, Inc. representative for more specific information
about your options.