Siemens Free Energy Band RCU61U Betriebsanleitung

Free Energy Band

RCU61U

Technical Instructions

Document No. 155-328P25

October 6, 2016

Room Temperature Controller

for CAV Systems

Siemens Industry, Inc.

Description

The RCU microprocessor controlled CAV room controller is designed for air only, or air

and water heating and/or cooling systems. Controllers have proportional response.

Features

•Modulating P-control

•0 to 10 Vdc output for cooling

•Three-position output 24 Vac for heating

•Operating modes: Normal, Energy Saving, Frost Protection, Standby, and Off

•Active 0 to 10 Vdc input for setpoint shifting

•Operating mode changeover input for remote control

•Adjustable minimum limitation for cooling output

•Deadband between heating and cooling

•Operating voltage 24 Vac

Application

Individual room temperature control in HVAC installations that are heated or cooled.

Controlling these types of equipment:

•Valve actuators

•Air damper actuators

Product Number

RCU61U With three-position signal for heating, without operating mode selector

Technical Instructions RCU61U Room Temperature Controller

Document Number 155-328P25 for CAV Systems

October 6, 2016

Page 2 Siemens Industry, Inc.

Table 1. Equipment Combinations.

Product Number

Description

Technical

Instructions

SSB81U

Three-position valve

actuator

155-195P25

SSC81U

SSC81.5U*

155-314P25

SQS85.53U

155-308P25

SSB61U

0 to 10 Vdc valve

actuator

155-192P25

GLB16…

GDE16…

0 to 10 Vdc Air

damper actuator

155-187P25

* See Wiring Diagram.

Function

The controller measures the room temperature with its integrated sensor and maintains

the setpoint by delivering control commands.

At setpoint condition, the output is 0 Vdc. On increase in temperature in cooling mode,

the output signal goes up from 0 to 10 volts (Direct Acting –D.A.).

The proportional band or the switching differential can be 2°F or 7°F (1°C or 4°C) in

heating mode and 1°F or 3.5°F (0.5°C or 2°C) in cooling mode (selectable with DIP

Switch No. 4).

Heating-Cooling with

Minimum Limitation

Cooling

T Room or return air

temperature

L, L10 Output percentage

W Room temperature set

point

Xdz Deadband

XpH Proportional band

heating

XpC Proportional band

cooling

VR 0 to 100% minimum

limitation cooling output

Figure 1. RCU61U Function Diagram.

Minimum Limitation of

Cooling Signal

Using the potentiometer located on the circuit board, the cooling signal output can be

limited to a minimum value of 0 through 100%. This can be used to ensure a minimum

supply air volume. When used in connection with a VAV controller, this setting must be

taken into account. To set minimum limitation, use a screwdriver to adjust the

potentiometer (see Figure 2). Values on the scale are percentage of full operation.

RCU61U Room Temperature Controller Technical Instructions

For CAV Systems Document Number 155-328P25

October 6, 2016

Siemens Industry, Inc. Page 3

Minimum Limitation of

Cooling Signal,

Continued

Figure 2. Potentiometer Location.

Setpoint Shifting

Signal Inputs (Terminals 1 and 2) are used for outside temperature compensation.

Using a 0 to 10 Vdc signal, the setpoint can be shifted by ±22.5°F at 72°F. The neutral

position is at 5 Vdc and means no setpoint shift.

W Original setpoint

W1 New setpoint at 10V input

W2 New setpoint at 0V input

(V) Input voltage

Figure 3. Setpoint Shifting.

Setpoint Limit Stops

The room temperature setpoint can be limited in increments of 2°F (1°C) by using the

minimum and maximum setpoint limit stops. This prevents arbitrary setpoint

readjustments.

To set limit stops, remove the setpoint knob by pulling it straight off the shaft.

Reposition gray tabs for high and low stops in the holes around the perimeter of knob

as required. See Figure 4.

Figure 4. Setpoint Limit Stops.

Technical Instructions RCU61U Room Temperature Controller

Document Number 155-328P25 for CAV Systems

October 6, 2016

Page 4 Siemens Industry, Inc.

Operating Modes

The following operating modes are available:

Normal

When dry contact (3) is open, the setpoint knob setting takes over control and normal

mode is initiated.

Energy Saving

Energy saving mode can be initiated by activating the external operating mode

changeover switch, if DIP Switch No. 1 is set to ON.

In energy saving mode, the heating setpoint is 61°F (16°C) and the cooling setpoint is

82°F (28°C), independent of the position of the setpoint knob.

When the DIP switch is in energy saving mode and the fan speed control is set to

standby, the energy saving mode takes precedence over standby mode. Low fan speed

will be selected even though the fan switch is on standby.

Frost Protection

Frost protection mode can be initiated by activating the external operating mode

changeover switch, if DIP Switch No. 1 is set to OFF.

If the room temperature falls below 46°F (8°C), the controller will automatically switch to

frost protection mode. In that case, the heating valve opens and the room temperature

is maintained at a setpoint of 46°F (8°C). Any adjustments you make to the setpoint will

be ignored.

Operating Mode

Changeover Switch

A changeover switch can be connected to status input D1–GND. When the switch

closes its contact (caused by an open window, for instance), the operating mode will

change from normal operation or standby to energy saving mode (if DIP Switch No. 1 is

set to ON), or from normal operation or energy saving mode to standby (if DIP Switch

No. 1 is set to OFF).

The operating action of the switch (Normally Closed - NC or Normally Open - NO) can

be selected.

Mechanical Design

The unit consists of two parts:

•A plastic housing which accommodates the electronics, the operating elements, and

the built-in room temperature sensor.

•A controller base.

The housing snaps into the top and bottom of the mounting base.

The screw terminals are mounted on the base. The DIP switches and the potentiometer

are located at the rear of the unit. To access the DIP switches, remove the controller

from the controller base. See Figure 5.

Figure 5. DIP Switch Settings.

RCU61U Room Temperature Controller Technical Instructions

For CAV Systems Document Number 155-328P25

October 6, 2016

Siemens Industry, Inc. Page 5

Table 2. DIP Switches.

DIP Switch

No.

Meaning

Position ON

Position OFF

Operating mode changeover

using an external switch

Changeover between

normal operation and energy

saving mode

Changeover between normal

operation, energy saving mode,

and standby1

Operating action of switch for

external operating mode

changeover

Changeover activated when

contact of switch is closed

(NO)1

Changeover activated when

contact of switch is open

(NC)

Standby

OFF

Frost protection mode (heating

output ON at a setpoint of 46°F

(8°C)1

P-band

2°F (1°C) in heating mode1

1°F (0.5°C) in cooling mode1

7°F (4°C) in heating mode

3.5°F (2°C) in cooling mode

Dead zone (Xdz)

3.5°F (2°C)1

9°F (5°C)

Cooling signal output in energy

saving mode

Active

Inactive1

1Factory setting

Accessories

ARG70 Adapter Plate for 2 × 4-inch or 4 × 4-inch conduit boxes

QAH11.1 Changeover/remote sensor

Notes

•Check the settings of DIP Switches No. 1 through No. 6 and change them, if

required.

•After applying power, the controller resets, which takes about three seconds. It will

then be ready to operate.

•The unit can be located on a wall of the room to be conditioned. Do not mount in

direct sunlight or near other heat or refrigeration sources.

•Mounting height is approximately 47 inches (120 cm) above the floor. See Figure 6.

•The connecting wires can be run to the controller from a recessed conduit box.

•Only authorized personnel should open the controller.

Figure 6. Acceptable Mounting Height.

Technical Instructions RCU61U Room Temperature Controller

Document Number 155-328P25 for CAV Systems

October 6, 2016

Page 6 Siemens Industry, Inc.

Mounting,

Installation and

Commissioning

When mounting the unit, attach the controller base first. Then, make the electrical

connections and fit and secure the cover.

The controller must be mounted on a flat wall and in compliance with local regulations.

Any radiator valves in the room must be set to their fully open position upon start-up.

Outputs 9 (Opening), 10 (Closing), and 8 (Neutral) are used to drive three-position

actuators with a maximum running time of 150 seconds from the fully closed to the fully

open position.

When commissioning the controller, an opening signal of 200 seconds is delivered,

followed by a closing signal of 200 seconds to ensure the actuator will be fully closed.

When the actuator has reached the position calculated by the controller, a waiting time

of 30 seconds is observed to stabilize the outputs. The 0 to 10 Vdc cooling output is not

available until 400 seconds after controller power-up.

User input using setpoint knob results in instantaneous response. There is a one-

minute delay before changes made to temperature sensing and changeover are

implemented.

Drywall Mounting

1. Insert a small screwdriver into the bottom of the controller and press in the tab

located in the center of the controller.

2. Lift the bottom of the controller from the controller base and push up to remove the

cover from the two tabs located at the top of the controller base.

3. Remove the base from the back of the controller.

Figure 7. Controller Cover Separation.

4. Using the controller base as a template, mark the hole locations with a pencil.

5. Drill two 1/4-inch diameter holes for the plastic wall anchors.

6. Using a mallet, tap in the plastic wall anchors flush with the wall.

7. Pull the wiring through the opening in the upper portion of the controller base.

8. Level the mounting plate.

9. Using the two wood screws provided, fasten the controller base to the wall. The

controller is not position sensitive.

10. Pull the wiring through the controller base.

11. Position the controller housing over the two mounting lugs located at the top of the

controller base, and press down on the cover until the bottom lugs snap in place.

RCU61U Room Temperature Controller Technical Instructions

For CAV Systems Document Number 155-328P25

October 6, 2016

Siemens Industry, Inc. Page 7

Drywall Mounting,

Continued

12. Terminate the wires per wiring instructions located above the terminal block.

Figure 8. Wiring Termination.

13. Reattach the controller to the controller base.

Figure 9. Controller Reattachment.

14. Adjust the setpoint dial to the desired setting.

The installation is now complete.

Technical Instructions RCU61U Room Temperature Controller

Document Number 155-328P25 for CAV Systems

October 6, 2016

Page 8 Siemens Industry, Inc.

4 × 4-inch Electrical Wall

Box Mounting

An ARG70 wall plate adapter is required to mount an RCU61U controller to a 4 × 4-inch

electrical wall box. The ARG70 wall plate adapter is included with electrical wall box

mount models.

1. Insert a small screwdriver into the bottom of the controller and press in the tab

located in center of the controller.

2. Lift the bottom of the controller from the controller base and push up to remove the

cover from the two tabs located at the top of the controller base.

3. Separate the controller base (5) from the controller (6).

4. Using the four screws provided, fasten the wall box adapter (3) to the plaster ring

(2). (Plaster ring supplied by others.)

5. Flex the adapter mask (4) and snap it in place inside the wall box adapter (3).

6. Pull wires through the plaster ring (2).

7. Fasten the controller base (5) to the wall box adapter assembly (3) and (4) with the

two screws provided.

8. Follow Drywall Mounting Steps 6 through 14.

The installation is now complete.

Figure 10. 4 × 4-inch Electrical Wall Box Installation.

1 Electrical wall box

2 Plaster ring

3 Wall box adapter *

* Included with ARG70

4 Adapter mask *

5 Controller base

6 Controller

RCU61U Room Temperature Controller Technical Instructions

For CAV Systems Document Number 155-328P25

October 6, 2016

Siemens Industry, Inc. Page 9

2 × 4-inch Electrical Wall

Box Mounting

An ARG70 wall plate adapter is required to mount an RCU61U controller to a 2 × 4-inch

electrical wall box. The ARG70 wall plate adapter is included with electrical wall box

mount models.

1. Insert a small screwdriver into the bottom of the controller and press in the tab

located in the center of the controller.

2. Lift the bottom of the controller from the controller base and push up to remove the

cover from the two tabs located at the top of the controller base.

3. Separate the controller base (5) from the controller (6).

4. Using the two screws provided, fasten the wall box adapter (3) to the wall box (1).

5. Flex the adapter mask (4) and snap it in place inside the wall box adapter (3).

6. Fasten the controller base (5) to the wall box adapter assembly (3) and (4) with the

two screws provided.

7. Follow Drywall Mounting, Steps 6 through 14.

The installation is now complete.

Figure 11. 2 × 4-inch Electrical Wall Box Installation.

1 Electrical wall box

3 Wall box adapter *

4 Adapter mask *

* Included with ARG70

5 Controller base

6 Controller

Technical Instructions RCU61U Room Temperature Controller

Document Number 155-328P25 for CAV Systems

October 6, 2016

Page 10 Siemens Industry, Inc.

Maintenance

The room temperature controller is maintenance-free. If inoperable, replace the entire

unit.

Specifications

Power Supply

Operating voltage 24 Vac ±10%

Control action (P) Proportional

Frequency 50/60 Hz

Functional Data

Setpoint setting range 50°F to 85°F (10°C to 30°C)

Maximum control deviation at 68°F (20°C) ±0.7K

Switching differential heating SDH or 2°F or 7°F (1°C or 4°C)

P-band XpH (selectable)

Switching differential cooling SDC or 1°F or 3.5°F (0.5°C or 2°C)

P-band XpC (selectable)

Temperature setpoint shift ±22.5°F at 72°F setpoint

Control output, Terminal 4

Voltage 0 to 10 Vdc

Current ±1 mA

Control output, Terminals 9 and 10

Three-position output

Voltage 24 Vac ±20%

Current 2A maximum

Motor timing for heating output 150 seconds at 50/60 Hz

Status input D1

Contact sensing 6 to 15 Vdc/3 to 6 mA

Insulation against mains voltage 4 kV

Maximum number of contacts connected 50

in parallel

Status input, terminal 1

Setpoint shift of 22.5°F (12.5°C) 0 to 10 Vdc

Neutral position (no setpoint shift) 5 Vdc

Maximum copper cable length 16 AWG

For Input Signal Terminal 1 262 feet (80 m)

For Input Signal D1 262 feet (80 m)

Environmental

Conditions

Operation

Temperature 32°F to 122°F (0°C to 50°C)

Humidity <95% rh

Agency Approvals

UL listing UL 873

Conforms to CE requirements

cUL certified to Canadian Standard

C22.2 No. 24-93

General

Connection terminals 2 × 16 AWG or 1 × 14 AWG

Maximum 20 AWG

Use solid wires or prepared stranded wires.

Weight 0.5 lb (0.23 kg)

Housing color

Cover White

Base Gray

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