SBC Q.RCU-A Series Manual

Q.RCU-A-xxxx Series
Analog room control unit
Hardware Installation Guide
Document 26-605 | Edition ENG01 | 2016-03-22
Product Description
The Q.RCU-A-T series of analog wall sensors is designed to interface
with controllers of fan coil, heat pump, roof top and terminal
heating / cooling units. These sensors provide precision local
temperature measurement with the capability of local setpoint
adjustment, fan speed setting, and occupancy override.
The Q.RCU-A-T’s modern, alluring prole enclosure is suitable
for classrooms, hotels, executive areas, oce spaces and other
commercial areas. Mounting hardware with a separate sub-base
is provided with the device for installation on a dry wall or on an
electrical junction box.
This document describes the hardware installation procedures for
the following device models: Q.RCU-A-T, Q.RCU-A-TO, Q.RCU-A-TS,
Q.RCU-A-TSO, and Q.RCU-A-TSOF.
Unless otherwise indicated, the term Q.RCU-A-xxxx will be used in
this document to represent all the models of the Q.RCU-A-T Series
General Installation Requirements
For proper installation and subsequent operation of the Q.RCU-A-T,
pay special attention to the following recommendations:
- Upon unpacking the product, inspect the contents of the car-
ton for shipping damages. Do not install damaged sensors.
- Allow for proper clearance of device enclosure and wiring
terminals for easy access, hardware conguration and main-
tenance.
- The device is designed to operate under the following envi-
ronmental conditions:
■Ambient temperature from 0°C to 50°C
■Relative humidity from 0% to 90%, non-condensing.
- Ensure proper ventilation of device and avoid areas where
corroding, deteriorating or explosive vapors, fumes or gases
may be present. The device must be oriented with the ventila-
tion slots towards the top to permit proper heat dissipation.
Any type of modication to any SBC product will void the
product’s warranty.
Take reasonable precautions to prevent electrostatic
discharges to the device when installing, servicing or
operating it. Discharge accumulated static electricity by
touching one’s hand to a securely grounded object be-
fore working with the device.

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Installation Guide | 26-605_ENG01 03-2016 www.sbc-support.com
Saia-Burgess Controls AG
Q.RCU-A-xxxx Series
General Installation Requirements
Turn o power before any kind of servicing.
- All wiring must comply with electrical wiring diagrams as
well as national and local electrical codes.
- To connect the wiring to the device, use the terminal con-
nectors which are located inside the device’s enclosure. Use
a small at screwdriver to tighten the terminal connector
screws once the wires have been inserted.
- The board connectors accept wires or at cables rang-
ing from
- 0.64…1.63 mm diameter per pole.
- It is recommended that all terminals be wired by 18 AWG
wire except for network communications.
Device Components
Figure 1: Mounting a Smart-Sensor
Device Dimensions
Figure 2: From mid left to right: Front view, side view, back plate

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www.sbc-support.com Installation Guide | 26-605_ENG01 03-2016
Saia-Burgess Controls AG
Q.RCU-A-xxxx Series
Mounting Instructions
The Q.RCU-A-xxxx has been specially designed for easy installation.
However, certain conditions apply when choosing a suitable location
for the device:
- Install the device in a location of average temperature
approximately 1.5 m above the oor
- The device should not be installed on an exterior wall. The device
should not be installed near a heat source.
- The device should not be installed near an air discharge grill. The
device should not be installed in a place where it can be
- aected by the sun.
- Install the device in an area that provides proper device
ventilation. Nothing must restrain air circulation to the device.
The Q.RCU-A-xxxx has not been designed for outdoor
use.
Wall Mounting Installation Procedure
1. Remove the security screw from the device (Figure 5-1).
2. Open the device by pressing in the two (2) tabs on the bottom of
the device and pulling the bottom side of the front plate out. Pull
all cables 6” out of the wall, and insert them through the
3. central hole of the back plate.
4. Align the back plate with the wall and mark the location of the
mounting holes on the wall. Make sure to orient the proper side
of the back plate facing upwards.
5. Remove the back plate and drill holes in the wall if necessary.
Install anchors in the wall if necessary.
6. Make sure that the mounting surface is at and clean. Screw the
back plate onto the wall. Do not over tighten.
7. Strip each wire ¼” and insert each one according to the wiring
diagrams shown in this document.
8. Gently push excess wiring back into the wall.
9. Reattach the front plate and make sure it clips tightly into place.
Install security screw.
10. CU-D-L Light/Blind add-on modules front plates (if applicable).
Electrical Junction box Installation Procedure
The Q.RCU-A-xxxx can be mounted most American, European
and Asian style electrical junction box using screws.
11. Remove the security screw from the device (Figure 5-1).
12. Open the device by pressing in the two (2) tabs on the bottom
of the device and pulling the bottom side of the front plate out.
13. Pull all cables 6” out of the wall, and insert them through the
14. central hole of the back plate.
15. Screw the back plate onto the electrical junction box.
16. Strip each wire ¼” and insert each one according to the wiring
17. diagrams shown in this document.
18. Gently push excess wiring back into the electrical junction box.
Reattach the front plate and make sure it clips tightly into place.
Install security screw.
Device Wiring
The Q.RCU-A-xxxx has physical connections for up to four (4)
dierent features depending on the model. Theses features include
the following:
- Thermistor
- Setpoint potentiometer
- Status LED indicator Fan speed
- rotary switch
Wiring the 10 kΩ Thermistor
Terminals TEMP and COMMON are used for the 10 kΩ type
2 NTC thermistor, as well as for the override button (not available
on Q.RCU-A-xxxx and Q.RCU-A-TS models). These two termi-
nals are present on every Q.RCU-A-xxxx model.
Controller Input
Internal
Override Button
UI
COM
TEMP
COMMON
C
O
Internal
TNC Thermistor 10 kΩ
Figure 3: 10 kΩ NTC Thermistor input
The override button creates a short circuit on the control-
ler input, which is interpreted as an override signal.
Wiring the 10 kΩ Thermistor and the Setpoint Potentiometer
Terminals SETPOINT and COMMON are used for the 10 kΩ
setpoint potentiometer. These terminals are present on the
Q.RCU-A-TS, Q.RCU-A-TSO, and Q.RCU-A-TSOF models.
Controller
Inputs
Internal
Override Button
UI
COM
UI
TEMP
COMMON
SETPOINT
CO
Internal
Potentiometer 10 kΩ
Internal
TNC Thermistor 10 kΩ
Figure 4: 10kΩNTCThermistorandsetpointpotentiometerinputs
Wiring a Status LED indicator
Terminals LED and COMMON are used to connect a controller
output to the status LED indicator. These terminals are present
on the Q.RCU-A-TO, Q.RCU-A-TSO, and EC- Sensor-SOF.
Controller 12 Vdc Output
UO
COM
LED
Internal LED
COMMON
C
OM
Figure 5: Status LED indicator output

Saia-Burgess Controls AG
Bahnhofstrasse 18 | 3280 Murten, Switzerland
T [phone] | F [phone]
www.saia-pcd.com
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26-605 ENG01 03-2016 Technical data and information subject to change.
Wiring a Five-Position Fan Speed Rotary Switch
Terminals FANSPEED and COMMON are used to connect the
ve internal preset resistance values of the fan speed rotary
switch to a controller input. These terminals are present on the
Q.RCU-A-TSOF model. The following table shows the ve fan
speed settings and their corresponding resistance values.
Fan Speed Setting Corresponding Resistance Value
Auto
0 Ω
O
2.5 kΩ
Fan Speed 1
5.0 kΩ
Fan Speed 2
7.5 kΩ
Fan Speed 3
10.0 kΩ
Internal
resistors
switch
Controller
UI
COM
FANSPEED
COMMON
5-
position
rotary
2.5 kΩ
5.0 kΩ
7.5 kΩ
10.0 kΩ
Figure 6: Five-position fan speed input
Document History
Version Changes Published Comments
ENG01 2016-03-23 2016-03-23 First edition
Trademarks
Saia PCD® is a registered trademark of Saia-Burgess Controls AG, short form SBC.
Technical changes are subject to the state of technology.
Saia-Burgess Controls AG, 2016. © All rights reserved.
Postal address for returns from customers of the Swiss Sales ofce
Saia-Burgess Controls AG
Service Après-Vente
Bahnhofstrasse 18
3280 Murten, Switzerland