RWD45U Controller
Installation and
Commissioning Guide
Document No. 129-409
October 5, 2009
Item Number 129-409, Rev. BA
Function
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.
Function Summary
•
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)
Setpoint reset
Remote setting unit
Sensor averaging
Alarm
Winter/Summer setpoint changeover
Filter alarm
Sensor select
•
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).
Application
The RWD45U has standard pre-configured applications. There are nine main
configuration loops with combinations of ten auxiliary functions. See Table 1.
