RWD CONTROLLERS TECHNICAL

1
RWD CONTROLLERSTECHNICAL

• HVAC Products Americas Region

2

• RWD82U

3
RWD82U controller
RWD82U Connection Diagram
4
RWD82U
Applications with corresponding selectable
auxiliary function
5
Main Sequences

• RWD82U

6
RWD82U - Main Sequence
2 Heating sequences or 2 Reverse Acting sequences
(Dependent)

• Application No. 10 - 19
• 2 electric heaters
• heating valve with heating pump

7
RWD82U - Main Sequence
2 Heating sequences or 2 Reverse Acting sequences
(Independent)

• Application No. 20 - 29

8
RWD82U - Main Sequences
Heating sequence or Direct or Reverse Acting
Sequence (3-point)

• Application No. 30 - 39

9
RWD82U - Main Sequence
Heating Cooling sequences or Reverse Direct
acting sequences

• Application No. 40 - 49

10
RWD82U - Main Sequence
2 Cooling sequences or 2 Direct Acting sequences
(Independent)

• Application No. 50 - 59

11
RWD82U - Main Sequence
2 Cooling sequences or 2 Direct Acting sequences
(Dependent)

• Application No. 60 - 69

12
RWD82U - Main Sequences
Cooling sequence or Reverse or Direct Acting
sequence (3-position)

• Application No. 70 - 79

13

• RWD62U

14
RWD62U controllerTermination
15
RWD62
Applications with corresponding selectable
auxiliary function
16
Main Sequences

• RWD62U

17
RWD62 - Main Sequences
Heating sequence or Direct Acting sequence

• Application No. 10 - 19

Output Y1 can be switched from D.A. to R.A.
18
RWD62 - Main Sequences
2 Heating sequences or 2 Direct Acting sequences
X1
Y1
Y2
Y
Temp.
RWD62U

• Application No. 20 - 29

Outputs Y1 and Y2 can be switched from D.A. to
R.A.
19
RWD62 - Main Sequences
Heating Cooling sequences or Direct Reverse
acting sequences

• Application No. 30 - 39

Output Y1 can be switched to R.A. and Y2, D.A.
20
RWD62 - Main Sequences
Cooling sequences or Reverse Acting sequences

• Application No. 40 - 49

Output Y1 can be switched to D.A.
21
RWD62 - Main Sequences
2 Cooling sequences or 2 Direct Acting sequences

• Application No. 50 - 59

Output Y1 and Y2 can be switched to D.A.
22

• RWD68U

23
RWD68U controller
24
RWD68U
Applications with corresponding selectable
auxiliary function
25
Main Sequences

• RWD68U

26
RWD68U - Main Sequence
Heating sequence or Reverse Acting sequence

• Application No. 10 - 19

27
RWD68U - Main Sequence
2 Heating sequences or 2 Direct Acting sequences
(Dependent)

• Application No. 20 - 29
• Heating coil with electric heater
• By-pass system with pump 3-way valve
• Output Y1 can be switched to R.A.

28
RWD68U - Main Sequence
2 Heating sequences or 2 Direct Acting sequences
(Independent)

• Application No. 30 - 39

Output Y1 can se switched to R.A.
29
RWD68U - Main Sequence
Heating Cooling sequences or Reverse Direct
acting sequences
X1
Y1
Q1
Y
Q1
Temp.
RWD68U

• Application No. 40 - 49

Output Y1 can be switched to R.A.
30
RWD68U - Main Sequence
Heating Cooling sequences or Reverse Direct
acting sequences

• Application No. 50 - 59
• Heating Coil and Direct Chiller
• Output Y1 can be switched to D.A.

31
RWD68U - Main Sequence
2 Cooling sequences or 2 Direct Acting sequences
(Dependent)

• Application No. 60 - 69
• Direct chiller
• Output Y1 can be switched to D.A.

32
RWD68U - Main Sequence
2 Cooling sequences or 2 Direct Acting sequences
(Independent)

• Application No. 70 79
• Output Y1 can be switched to D.A.

33
RWD68U - Main Sequence
Cooling sequence or Direct Acting sequence

• Application No. 80 89
• Output Y1 can be switched to D.A.

34
Auxiliary Functions

• RWD

35
RWD - Auxiliary Functions
1. Remote setpoint (_1)

• A remote setpoint transmitter QAA25U (1K Ni) or
  544-764 1K Plat), connected to X2 and configured
  accordingly, assumes the function of the setpoint

36
RWD - Auxiliary Functions
2. PI Limiter (_2 _3)

• The limiter function with PI control enables
  absolute(or relative) maximum or minimum
  limitation of the supply air temperature (X2).
• When the value drops below or exceeds the limiter
  setpoint, the limiter function overrides the
  standard control function to maintain the limiter
  setpoint.

37
RWD - Auxiliary Functions
3. Setpoint Compensation (_4)

• The temperature setpoint X1 is controlled by the
  temperature as measured at sensor X2.
• Configuration of the RWD62U defines the influence
  on setpoint X1.
• The example shows the supply air temperature
  setpoint as controlled by the outside temperature.

38
RWD - Auxiliary Functions
4. Cascade Control (_5)

• X2 - Supply air temperature sensor
• You can select the PI/PI room/supply air
  temperature cascade control. In this case, the
  virtual PI room temperature controller determines
  the setpoint within the limiter setpoints for the
  PI supply air temperature controller.

39
RWD - Auxiliary Functions
5. Summer / Winter operation (_6 _7)

• X2?M terminals (Digital/analog)
• A digital switch or anlog output between
  terminals X2 and M can be used to implement
  summer/winter changeover.

40
RWD - Auxiliary Functions
5. Summer / Winter operation (_6 _7) (Cont.)

• Digital changeover
• When the contact is closed, summer operation is
  selected. Output Y1 is set to Reverse Action
  (cooling).
• When the contact is open, winter operation is
  selected. Output Y1 is set to Direct Action
  (heating).
• Analog changeover
• When the X2 reach over the setpoint, summer
  operation is selected. Output Y1 is set to
  Reverse Action (cooling).
• When the X2 is below the setpoint, winter
  operation is selected. Output Y1 is set to Direct
  Action (heating).

41
RWD - Auxiliary Functions
6. Maximum Priority (_8)

• If the input value (010V) of the input X2 is
  greater than the calculated output of the cooling
  sequence, the output will use the X2 input value
  as output value. This is active even when the
  controller is working with the heating sequence.

42
RWD - Auxiliary Functions
7. Day / Night Setpoint (For all RWDs,
independent of App. No.)

• D1?M potential-free contact (External time clock)
• A timer contact between terminals D1 and M can be
  used to implement setpoint changeover for
  day/night operation.
• When the contact is open, the setpoint for day
  operation is selected.
• When the contact is closed, the setpoint for
  night operation is selected.

43
RWD - Software tool125-3481

• Simple windows based operation
• Numbered standard applications
• Customize applications
• Print-out of final settings
• Hide selected parameters from LCD
• Create your own application library based on
  system type or customer