Data Sheet for Product

Powers™ Controls
Technical Instructions
Document Number 155-012P25
EC 184-1
March 16, 2005
EC 184 Pneumatic Enthalpy
Transmitter-Comparator System
184-0101 Enthalpy Transmitter
243-0043 Enthalpy Comparator
142-0424 Enthalpy Receiver
Gauge
Description
The Powers Pneumatic Enthalpy Transmitter-Comparator System consists of two direct
acting, one-pipe transmitters that sense enthalpy, that is, total heat and an enthalpy
comparator. The transmitters are located in the outdoor air and return air. The enthalpy
comparator is a logic element that compares the enthalpy signals sensed by the two
transmitters. The comparator selects the lowest enthalpy air source (mixing versus
recirculation with minimum outdoor air) as the input to the mechanical cooling
equipment to minimize energy consumption.
Features
• Single sensor enthalpy measurement
• Easy installation and calibration
• Quick response
Product Numbers
Table 1.
Product Number Description
184-0101 Enthalpy Transmitter
243-0043 Enthalpy Comparator
142-0424 3-1/2" Enthalpy Receiver Gauge
Application
The most common application is to use this enthalpy transmitter-comparator system to
position the outdoor air, return air, and exhaust air dampers to provide the lowest
enthalpy air as mixed air for cooling. See Figure 1.
The output of the comparator is a low capacity signal. If a large capacity signal is
required, add an amplifying relay whenever a minimum pressure relay is not used.
Siemens Building Technologies, Inc.
Discontinued