RWD Controllers
Application Guide
Quick Reference
Document No. 125-3511
March 28, 2005
RWD44U/45U/62U/68U/82U
The RWD Controllers have standard, pre-configured applications. The respective application and setting parameters
are entered via push buttons on the controller or a software tool. See the individual
Application Guides
(available
online)
or the
Installation and Commissioning Guide
for additional information. Use Tables 1 through 12 to determine
the appropriate controller model and application number.
Example:
Select an application that controls two stages of electric heat and two stages of digital cooling, and
includes remote setpoint and an alarm to signal dirty air filters.
1. Select a controller based on the number of outputs and characteristics required. In this example, four digital
outputs are required. Select the RWD44U Controller (see Table 1).
Table 1. Controller Models.
Outputs
Controller Model
Analog 0 to 10 Vdc
Digital
RWD82U 0
2
RWD62U
2 0
RWD68U 1
1
RWD44U 0
4
RWD45U 1
4
2. Determine the main control loop. Select an application number based on the output characteristics. For the
RWD44U Controller, main control loop 1X (application group 10 through 19) contains the output characteristics
that match this example (see Table 3).
3. Determine the auxiliary control loop. In this example, an auxiliary control loop (X1) is required to readjust the
setpoint remotely (see Table 4).
The controller model and application number needed for this example is
RWD44U, Application #11
.
Table 2. Legend.
Digital Output (DO)
cooling
RV
Reversing valve cooling
Analog control loop, DA
Digital Output (DO)
heating
RV
Reversing valve heating
Analog control loop, RA
Siemens Building Technologies, Inc.
