Siemens RWD45U Installation And Commissioning Manual

RWD45U Controller
Function
Function Summary
Application
Item Number 129-409, Rev. BA
RWD45U controllers are intended for HVAC and Refrigeration systems including Heat
Pumps. They are suitable for 1-, 2-, and 3-stage compressors.
Input X1 detects the actual room or space temperature and compares it with the
setpoints. Depending on the deviation, the controller acts accordingly with its outputs to
achieve the desired setpoints. The RWD45U controller has a modulating 0 to 10 Vdc
output for economizer control or an additional independent control loop.
•
Controller – Stand-alone controller with four two-position (On/Off) outputs, and one
modulating 0 to 10 Vdc output.
•
Universal input (X1) for the main temperature sensor.
•
Universal input (X2) for the following auxiliary functions:
On/Off (Standby)
Remote setting unit
Alarm
Filter alarm
•
Universal input (X3) for the following functions:
−
Economizer
−
Second independent loop
•
Digital input (D1) for the following digital functions:
−
Day/night changeover setpoint
−
On/Off (Standby)
−
Alarm
−
Filter alarm
•
The RWD45U controller is intended for either DIN rail mounting in a switchboard or
screw mounting with a protective enclosure.
•
Desired output configuration and auxiliary function must be entered for initial set-
up. See Initial Program Settings (New Controller).
The RWD45U has standard pre-configured applications. There are nine main
configuration loops with combinations of ten auxiliary functions. See Table 1.
Installation and
Commissioning Guide
Document No. 129-409
Setpoint reset
Sensor averaging
Winter/Summer setpoint changeover
Sensor select
October 5, 2009