Siemens RLA162.5U User manual

Installation Instructions
Document No. 129-450
October 5, 2009
RLA162.5U Room Temperature
Controller
Item Number 129-450, Rev. AA Page 1 of 4
Product Description
Room temperature controller for basic ventilation, air
conditioning and heating systems. Compact design
with two analog, 0 to 10 Vdc control outputs for
heating and/or cooling.
Product Numbers
RLA162.5U Automatic Heat/Cool Changeover
Warning/Caution Notations
WARNING:
Personal injury/loss of life may
occur if you do not follow the
procedures as specified.
CAUTION:
Equipment damage, or loss of
data may occur if you do not
follow the procedures as
specified.
Required Tools
•Small, flat-blade screwdriver
•Wire strippers
•6-inch level
Mounting Accessories
•ARG70 wall plate
•141-570 lockable thermostat guard
•QAP22 Changeover sensor
Expected Installation Time
35 minutes
Prerequisites
•Provide 24 Vac power source to thermostat wall
mounting location.
•Run wires from damper/valve actuator to
thermostat wall mounting location.
Installation
Figure 1. Acceptable Mounting Height in Inches.
Figure 2. Airflow Requirements in Inches.

Document No. 129-450
Installation Instructions
October 5, 2009
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Document No. 129-450
Installation Instructions
October 5, 2009
Siemens Industry, Inc. Page 3 of 4
Wiring Terminals
1 Operating voltage, 24 Vac positive
2 Operating voltage, 24 Vac negative
D1 Day/night changeover
5 Limitation input 0 to 10 Vdc
GND Ground for day/night changeover
10 Measuring Neutral
11 Heat/cool changeover sensor
13 Fan or auxiliary relay, positive
18 Control signal, 0 to 10 Vdc, Heat 1
19 Control signal, 0 to 10 Vdc, Cool or
Heat 2
20 Fan or auxiliary relay, negative
Figure 3. RLA162.5U Wiring Terminals.
Wiring Diagrams
Figure 4. RLA162.5U Room Temperature Control with
Setpoint Changeover.
Figure 5. RLA162.5U Room Temperature Control with
Minimum Limitation of the Supply Air Temperature.
B2 Heat/cool changeover sensor
E1 Fan or auxiliary unit
F2 Freeze stat
M Neutral
N1 Room temperature controller (RLA162.5U)
N2 Air duct temperature controller (RLM162U) as a
limiter
R Resistive input
S1 Time clock or switch for day/night setpoint
changeover
U 0 to 10 Vdc output feedback
Y 0 to 10 Vdc input signal
Y1 Heating valve actuator
Y2 Cooling valve actuator
Z9 Limit thermostat
Commissioning Table 1. DIP Switch Settings.
Function
1
2
3
4
5
Action
Operating mode
Heating and cooling in sequence
Two-stage heating
Single-stage cooling
Single-stage heating
Control mode PI (integral action time 600 seconds)
P (XP1)
Heating output control
Action (18)
10 Vdc at setpoint conditions
0 Vdc at setpoint conditions
Cooling/Second stage
output Control Action (19)
10 Vdc at setpoint conditions
0 Vdc at setpoint conditions
The factory default setting for all five switches is OFF.

Document No. 129-450
Installation Instructions
October 5, 2009
Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as
design improvements are introduced. Teflon is a registered trademark of DuPont. Product or company names mentioned herein may be the trademarks
of their respective owners. © 2009 Siemens Building Technologies, Inc.
Siemens Industry, Inc.
Building Technologies Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089
+ 1 847-215-1000
Your feedback is important to us. If you have
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Document No. 129-450
Printed in the USA
Page 4 of 4
Commissioning, Continued
Proportional band adjustment (XP1): Potentiometer setting should correspond to the required
0°F to 90°F (0 K to 50 K) range of the controller’s output signal.
Energy saving adjustment (ECO): Potentiometer setting should correspond to the required
0°F to 18°F (0 K to 10 K) offset of normal setpoint. Energy Saving = Normal setpoint
+/- offset.
NOTE: XP1 and ECO adjustments must be made by the user; factory settings are zero or “random”.
Troubleshooting
Response
Possible Causes
Valve does not
respond •Valve not connected
•No power supply
Valve travels in the
wrong direction •Selection of operating action is
wrong. DIP Switches 4 (Y1) and
5 (Y2) should match control
action of the valve actuator.
•Wrong controller terminal used
Control responds
too slowly
•Reduce P-band (XP1)
Control is unstable
•Increase P-band (XP1)
Dimensions
Figure 6. Dimensions in Inches (Millimeters).