Siemens RCC10U Betriebsanleitung

RCC10U

Technical Instructions

Document No. 155-712

September 27, 2007

Room Temperature Controller

for Two-pipe Fan Coil Units

Siemens Industry, Inc.

Description

Room temperature controller for two-pipe fan coil units.

Features

•Output for on/off valve actuator.

•Output for three-speed fan.

•Dual setpoint temperature scale.

•Control depending on the room or return air temperature.

•Automatic Heating/Cooling changeover.

•Operating modes: Normal, Energy Saving, Freeze Protection and Off.

•Operating mode changeover input for remote control.

•Selectable control parameters.

•Operating voltage 120 Vac.

Application

Typical use:

•Controlling room temperature in individual rooms that are heated or cooled with two-

pipe fan coil units.

•Opening or closing a valve

•Switching a three-speed fan.

Suitable for use in systems with:

•Automatic Heating/Cooling changeover.

•Heating only/Cooling only or Heating and Cooling applications.

Product Number

RCC10U With input for return air temperature sensor

Technical Instructions RCC10U Room Temperature Controller

Document Number 155-712 for Two-pipe Fan Coil Units

September 27, 2007

Page 2 Siemens Industry, Inc.

Accessories

ARG70 Adapter plate, for 2-inch × 4-inch or 4-inch × 4-inch electrical wall boxes

QAH11.1 Changeover/remote sensor

141-570 Lockable Thermostat Guard

Ordering

The QAH11.1 temperature sensor (which can be used as a return air temperature or

changeover sensor), and valves must be ordered separately. An ARG70 Wall Box

Adapter (used to mask the drywall when mounting the controller to a 2-inch × 4-inch or

4-inch × 4-inch electrical wall box) must also be ordered separately.

Table 1. Equipment Combinations.

Product Number

Description

Technical Instructions

QAH11.1

Temperature Sensor

155-329P25

599 Series

Two-way and Three-way

Zone Valves

155-320P25

SF Series

Zone Valve Actuator

155-321P25

Warning/Caution Notations

WARNING:

Personal injury, or loss of life may occur if you do not follow a

procedure as specified.

CAUTION:

Equipment damage, or loss of data may occur if you do not

follow a procedure as specified.

Functions

The controller measures the room temperature with its integrated sensor or external

return air temperature sensor (QAH11.1)—if used—and maintains the setpoint by

delivering control commands to the two-position (on/off) valve.

The switching differential is adjustable; it can be 2°F (1°C) or 7°F (4°C) in Heating

mode, or 1°F (0.5°C) or 3.5°F (2°C) in Cooling mode.

Fan Operation

The fan is switched to the selected speed via control output 11, 10 or 9 (Low, Medium

or High).

When the Temperature-dependent fan control function is activated (can be selected

with DIP Switch No. 1), the fan and valve are switched ON or OFF depending on the

temperature.

It is switched OFF by:

•Leaving the Heating or Cooling sequence, if the function Temperature-dependent

fan control is activated.

•Manually changing to Standby , if room conditions do not call for Freeze Protection

mode.

•Activating an external operating mode changeover switch, if installation conditions

do not call for Energy Saving or Freeze Protection mode.

•Turning the controller’s power supply OFF.

RCC10U Room Temperature Controller Technical Instructions

for Two-pipe Fan Coil Units Document Number 155-712

September 27, 2007

Siemens Industry, Inc. Page 3

Heating/Cooling Mode

Output terminals 7 and 5 (neutral) command the control valve.

Output terminals 7 and 5 are open (0 Vac) when:

1. The measured room temperature is at half the switching differential below the

setpoint (Heating mode), and

2. The valve has been fully closed for more than one minute.

Output terminals 7 and 5 are closed (120 Vac) when:

1. The measured room temperature is at half the switching differential above the

setpoint (Heating mode), and

2. The valve has been fully open for more than one minute.

NOTE: Output terminals 7 and 5 deliver a control command only for fail-safe open

(Normally Open) valve/actuator assemblies. Fail-safe closed (Normally

Closed) valve/actuator assemblies cannot be used with the RCC10U

Controller.

Return Air Temperature

The RCC10U provides control based on either the measured room temperature or the

fan coil unit’s return air temperature.

Changeover is automatic if a QAH11.1 cable temperature sensor is connected to the

device. Place the sensor in the return air duct and terminate to the controller.

Order the QAH11.1 separately for return air sensing.

Automatic

Heating/Cooling

Changeover

CW = Chilled Water Cooling

mode

HW = Hot Water Heating

mode

M = Operating mode

SDC = Switching differential,

cooling

SDH = Switching differential,

heating

T = Room temperature

Tw = Water temperature

W = Room temperature

setpoint

Y = Signal voltage

The controller uses the water temperature measured by the changeover sensor

(QAH11.1) to switch from Heating to Cooling mode, or vice versa. When the water

temperature is above 82°F (28°C), the controller switches to Heating mode; below 61°F

(16°C) it switches to Cooling mode. If the water temperature is between the two

changeover points immediately after switching on, the controller will start in the Heating

mode. The water temperature is measured at one-minute intervals and the operational

status is updated.

Heating Mode

Cooling Mode

Automatic Changeover

Figure 1. Switch Action for Output Teminals 7 and 5.

Remote Changeover

Heating/Cooling

An electric switch placed between input terminals 2 and 3 can

facilitate remote changeover. Terminals 2 and 4 must be bridged.

When the switch is closed, the Cooling mode is selected. When the

switch is open, the Heating mode is selected. Up to ten thermostats

can be connected in parallel.

Heating only

For heating only applications, input terminals 2 and 3 are open.

Cooling only

For cooling only applications, input terminals 2 and 3 must be

bridged with wire.

Technical Instructions RCC10U Room Temperature Controller

Document Number 155-712 for Two-pipe Fan Coil Units

September 27, 2007

Page 4 Siemens Industry, Inc.

Purging Function

The changeover sensor initiates the change from Heating to Cooling mode even if the

two-way valves are shut down for a long period of time. To ensure this function, the

valves are opened for one minute at two-hour intervals.

After power is reset to the controller, the heating and cooling valve will open for one

minute to flush pipes, for accurate remote changeover sensing. When this function is

completed, the changeover sensor will select the correct mode.

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 unauthorized setpoint

adjustment.

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

gray tabs for high and low stops in the holes around the perimeter of knob as required.

See Figure 2.

Figure 2. Setpoint Limit Stops.

Operating Modes

The following operating modes are available:

Normal Operating Mode

Heating or Cooling mode with automatic changeover and with manually selected fan

speed: (Low), (Medium), (High). In Normal operation, the controller maintains

the adjusted setpoint.

Freeze Protection Mode

The Freeze Protection function is activated only when DIP Switch No. 4 is set to OFF.

Freeze Protection mode can be activated by:

•Manually switching to Standby .

•Activating the external operating mode changeover switch, if DIP Switch No. 2 is set

to OFF.

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

Freeze Protection mode. In that case, the heating valve opens and the fan operates at

the selected speed. If the Standby mode is selected, the fan will operate at low speed.

The room temperature is maintained at a setpoint of 46°F (8°C) and the setpoint

adjusted by the user will be ignored.

If Freeze Protection operation is locked (DIP Switch No. 4 in position ON), Standby is

also locked, which means that the controller will switch to OFF instead of Standby.

RCC10U Room Temperature Controller Technical Instructions

for Two-pipe Fan Coil Units Document Number 155-712

September 27, 2007

Siemens Industry, Inc. Page 5

Energy Saving Mode

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. This operating mode will

be activated when input D1 for operating mode changeover is active and DIP Switch

No. 2 is set to ON.

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. When the

room temperature drops below the Energy Saving setpoint, the fan operates at low

speed until the energy load is satisfied; then the fan turns off. Low fan speed will be

selected even though the fan switch is on Standby.

Operating Mode

Changeover Switch

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

closes its contact (such as, caused by an open window), the operating mode will

change from Normal operation to Energy Saving mode (if DIP Switch No. 2 is set to

ON), or from Normal operation to Standby (if DIP Switch No. 2 is set to OFF). If the

room temperature falls below 46°F (8°C) and if DIP Switch No. 4 is set to OFF, Freeze

Protection mode will become active.

The operating action of the switch (NC or NO) can be selected by DIP Switch 3.

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 of the mounting base and is secured with a screw at the

bottom.

The wire terminal block is mounted on the base; the DIP switches are located at the

rear of the housing.

To access the DIP switches, remove controller from controller base. See Figure 3.

Figure 3. DIP Switch Setting.

Technical Instructions RCC10U Room Temperature Controller

Document Number 155-712 for Two-pipe Fan Coil Units

September 27, 2007

Page 6 Siemens Industry, Inc.

Table 2. DIP Switches.

DIP Switch No.

Description

Position ON

Position OFF

Fan control

Fan control is temperature-

dependent in all operating modes

Fan control in Normal

operation is temperature-

independent1

Operating mode changeover

via an external switch

Changeover between Normal

operation and Energy Saving

mode

Changeover between Normal

operation 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

Freeze Protection function

disabled

Freeze Protection function

enabled

Switching differential

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

1. Factory setting

Construction

1 Standby mode selector /fan speed switch: (Low), (Medium), (High).

2 LEDs for indicating Heating mode, Cooling mode and fan operation.

3 Setting for minimum setpoint limit stop (in increments of 2°F [1°C]).

4 Setting for maximum setpoint limit stop (in increments of 2°F [1°C]).

5 Room temperature setpoint knob.

6 Set of DIP switches (mounted on circuit board).

Figure 4. Construction.

RCC10U Room Temperature Controller Technical Instructions

for Two-pipe Fan Coil Units Document Number 155-712

September 27, 2007

Siemens Industry, Inc. Page 7

Mounting,

Installation and

Commissioning

•The unit can be located on a wall or inside a fan coil unit. Do not mount in direct

sunlight or near other heat or refrigeration sources.

•Mounting height is approximately 60 inches (150 cm) above the floor, when using

the wall mounting option. See Figure 5.

•The unit can be fitted to most commercially available recessed electrical wall boxes

or directly on the wall. A Wall Box Adapter Kit (ARG70), ordered separately, is

recommended but not required to mount an RCC10U controller to a

2-inch × 4-inch electrical wall box. An ARG70 is required for 4-inch × 4-inch electrical

wall box mounting. The wall plate will cover the drywall cutout.

•Check the settings of the DIP switches and change them, if required.

•After applying power, the controller makes a reset during which the fan LED flashes

indicating that the reset has been accomplished. This takes about three seconds.

When the LED stops flashing, the controller is ready to operate.

Figure 5. Acceptable Mounting Height in Inches.

•Prior to fitting the changeover sensor, apply thermal conductive paste on the pipe

where the sensor is to be placed. Secure with plastic cable ties.

•The sensor is not position sensitive.

•The cables used must meet the insulation requirements for live voltage.

•The control valve is fully open for one minute upon start-up to determine if it is in

Heating or Cooling mode (purging function).

•User input via setpoint knob or operating mode/fan speed selector results in

instantaneous response. There is a one-minute delay before changes made to

temperature sensing and changeover are implemented.

WARNING:

Sensor inputs 1, 2 and 3 carry live voltage potential. If the sensor’s cables

must be extended, the cables used must be suited for live voltage.

•Installation Instructions are included with the controller.

Technical Instructions RCC10U Room Temperature Controller

Document Number 155-712 for Two-pipe Fan Coil Units

September 27, 2007

Page 8 Siemens Industry, Inc.

Installation

Instructions

4-inch × 4-inch Electrical

Wall Box Mounting

An ARG70 wall plate adapter is required to mount an RCC10U controller to a 4-inch ×

4-inch electrical wall box.

1. Loosen the screw at the bottom of the controller with a small screwdriver.

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

Figure 6. Controller Separation.

3. Fasten the wall box adapter (3) to plaster ring (2), supplied by others, using the four

screws provided with the ARG70.

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

5. Pull wires through plaster ring (2).

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

screws provided.

Figure 7. 4-inch × 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

RCC10U Room Temperature Controller Technical Instructions

for Two-pipe Fan Coil Units Document Number 155-712

September 27, 2007

Siemens Industry, Inc. Page 9

4-inch × 4-inch Electrical

Wall Box Mounting,

Continued

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

Figure 8. Wiring Termination.

8. Reattach the controller to the controller base.

9. Secure by tightening the screw at the bottom of the controller.

Figure 9. Controller Reattachment.

The installation is now complete.

Technical Instructions RCC10U Room Temperature Controller

Document Number 155-712 for Two-pipe Fan Coil Units

September 27, 2007

Page 10 Siemens Industry, Inc.

2-inch × 4-inch Electrical

Wall Box Mounting

An ARG70 wall plate adapter is recommended, but not required to mount an RCC10U

controller to a 2-inch × 4-inch electrical wall box.

1. Loosen the screw at the bottom of the controller with a small screwdriver.

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

Figure 6.

3. Fasten the wall box adapter (3) to plaster ring (2), supplied by others, using the two

screws provided.

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

5. Pull wires through plaster ring (2).

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

screws provided.

7. Follow Steps 7 through 9 of the 4-inch × 4-inch Electrical Wall Box Mounting

section.

The installation is now complete.

Figure 10. 2-inch × 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

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