Operating Instructions

Chapter 2 – Applications
Application 2928 LCM-OAVS Venturi Slow Speed, with BTU Compensation
12
Siemens Industry, Inc.
Owner's Manual
125-5083
06/30/2015
Application 2922 Control Drawing.
Application 2928 LCM-OAVS Venturi Slow Speed,
with BTU Compensation
The controller controls pressurization, ventilation, and room temperature in a laboratory
room served by one single-duct supply terminal with a reheat coil, one general exhaust
terminal, and up to six fume hoods (multiple fume hood flow signals must be averaged
using a Fume Hood Flow Module (FFM).
NOTE:
If desired, the LCM can be used without any fume hoods attached. In this case, MAX
HOOD VOL should be set to 0 cfm to disable the alarming that would occur if
MINHOODVOLTS is set to 1 Volt or more and the fume hood flow input drops below
.4 Vdc.
Pressurization is controlled by maintaining a selected difference between supply and
exhaust airflows.
Temperature control is determined by input from the Room Temperature Sensor
(RTS).