Technical FAQ
Lutron Temperature Control
Questions
Answers
General
1. How do I know if the
thermostat will work with my
HVAC system?
The thermostat works with most HVAC systems with the
exception of line voltage electric baseboard, Mili-volt, and
systems with proprietary control interfaces. For a complete
list see the “RadioRA® 2 HVAC Controller, seeTemp™, and
Wireless Temperature Sensor Specification Sheet” found on
www.lutron.com.
2. How many zones can the
thermostat control?
The HVAC controller can control one heat zone and one cool
zone. It can control up to three heat stages and two cool stages.
3. How can I control multiple
zones?
You can control additional zones by adding extra HVAC controllers.
Up to 5 wireless sensors can be added to a main repeater.
4. Can the thermostat control
humidity?
No.
5. Is the thermostat Energy Star
qualified?
No. Energy Star stopped rating thermostats in 2009. Other
thermostat manufacturers are gradually removing the Energy Star
logo from their packaging and literature. The default schedule is
designed to provide recommended energy savings.
6. Can the thermostat operate
without a main repeater?
The thermostat requires a main repeater for normal operation. If
the main repeater is removed the HVAC controller, seeTemp™ wall
control, and wireless temperature sensors will continue to function
if they are within wireless range (30 feet) of each other.
7. Do I need to use the RadioRA 2
PC software for programming?
For initial configuration, the system can be temporarily set up
without using the PC software, but it will function as a nonprogrammable thermostat. That is, the set point can be controlled,
but no scheduling is possible. The RadioRA 2 PC software must
be used to enable these features.
8. What are the maximum/
minimum set points?
Default:
Heat max: 76º F, Heat min: 60º F.
Cool max: 80º F, Cool min: 64º F.
Can be modified as follows:
Heat max: 70º–103º F, Heat min: 40º–60º F
Cool max: 80º–113º F, Cool min: 50º–70º F
9. What is the minimum heat/cool
set point difference?
This is the minimum temperature difference between the heat and
cool set points. This ensures that the heat and cool systems will
not run at the same time.
Default: 4º F
Configurable: 3º–15º F
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Technical FAQ
Lutron Temperature Control
Questions
Answers
General
10. What is temperature
calibration?
Temperature calibration allows the temperature sensors in the
system to be adjusted to match an independent temperature
reading. The temperature can be calibrated +/- 5º F from the default.
11. What is minimum run time?
Minimum run time is the minimum length of time that the heat or
cool stages will run once started. This prevents over cycling of the
HVAC system and helps to prolong the system’s life.
12. What is minimum off time?
Minimum off time is the minimum length of time that the heat or
cool stages will remain off after turning off. This prevents over
cycling of the HVAC system and helps to prolong the system’s life.
13. What are turn on temperature
deltas?
This is the amount that the temperature must drop below the set
point for heating to turn on or the amount that the temperature
must rise above the set point for cooling to turn on. For example,
if the heat temperature delta was 2º F and the set point was 68º
F the heat would turn on when the temperature dropped to 66º F
and would turn off once the temperature rose to to 68º F.
14. Can I control the thermostat
while away from home?
Yes, by using the iPad® iPhone®, or iPod touch® app. Please see
app note #231 “Using a VPN Connection to Remotely Access
Lutron® Systems” which can be found on the RadioRA® 2
resource web site.
15. Is the thermostat schedule
programmable?
Yes, by using the RadioRA 2 PC software and the iPad® iPhone®,
or iPod touch® app.
16. Can I control the thermostat
with Radio Powr Savr™
sensors?
Yes, you can change the set points on the thermostat by using
the RadioRA 2 PC software to program Radio Power Savr
occupancy/vacancy sensors.
17. Can I control the thermostat
with seeTouch® keypads?
Yes, you can program keypad buttons (using the RadioRA 2 PC
software) to change set points or to enable/disable the “Green” mode.
18. Can I control the thermostat
with a Pico® wireless control?
No.
19. Can I control the thermostat
with the astronomic timeclock?
We recommend using the built in HVAC schedule rather than the
astronomic timeclock to change set points during different times
of day.
20. Does the thermostat have an
outdoor temperature sensor?
No.
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Technical FAQ
Lutron Temperature Control
Questions
Answers
General
21. Can I control the thermostat
from 3rd-party remote controls/
automation systems?
Yes, through integration. Refer to the Lutron Integration Protocol
Guide on resi.lutron.com/radiora2 for more information.
22. Does the thermostat have a
“hold” feature?
Yes, the “hold” feature lets you suspend the normal HVAC
schedule and use a different set point. Once “hold” is turned
off the HVAC controller returns to it’s normal schedule. You can
activate “hold” from the iPad® iPhone®, or iPod touch® app.
23. Can the thermostat be used in
conjunction with a mechanical
“freeze prevention” thermostat
in vacation homes?
Yes, the “freeze prevention” thermostat would be wired in parallel
with the HVAC Controller.
HVAC Controller
24. How do I install the HVAC
controller?
The HVAC controller should be installed by a qualified HVAC
technician. The controller should be installed vertically or
horizontally using the supplied mounting screws and connected to
the HVAC system using the wiring guides in the HVAC controller
instruction sheet.
25. Can the HVAC controller be
installed in a hot attic?
The HVAC controller should be installed indoors in a space where
the temperature does not drop below 32º F or rise above 160º F
and the humidity does not rise above 90%.
26. Where should the HVAC
controller get installed?
The HVAC controller should be installed near the HVAC system
and within 30 feet of a RadioRA® 2 repeater.
27. Can I use a 3rd-party wired
temperature sensor?
Yes, you should use a 100 kΩ curve “J” thermistor.
It should be connected to the HVAC controller with
a maximum wire run of 100 feet.
seeTemp™ Wall Control
28. Can seeTemp set the
temperature above 80º F or
below 60º F degrees?
No, you can set temperatures above 80º F or below 60º F from
keypad buttons, integration commands, timeclock events or from
the iPad® iPhone®, or iPod touch® app.
29. Is seeTemp required for
temperature control in
RadioRA 2?
No, you can control temperature from the iPad® iPhone®, or iPod
touch® app and through integration.
30. Can I use multiple seeTemp
wall controls with one HVAC
controller?
Yes, each seeTemp wall control counts as one system device.
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Technical FAQ
Lutron Temperature Control
Questions
Answers
seeTemp™ Wall Control
31. Can seeTemp be installed in a
low-voltage bracket?
Yes, the HVAC controller can be powered from
24V AC or 120V AC.
32. Can seeTemp be installed in a
120V wall box?
Yes.
33. Can I lock out the buttons on
seeTemp?
No.
34. What does the eco button on
seeTemp do?
The eco button enables/disables “eco” mode which
automatically raises the cool set point and lowers the
heat set point to save energy.
Wireless Temperature Sensor
35. What is the battery life of the
wireless temperature sensor?
5 years.
36. What happens when the
battery dies?
When the battery on one wireless temperature sensor is low
the “Room” temperature LED on the seeTemp wall control
will flash rapidly. The system will function with the remaining
wireless temperature sensors. When the batteries on all wireless
temperature sensors are low the “Set” LED on the seeTemp will
flash rapidly. Then the system will use the wired temperature
sensor. If the batteries in all wireless temperature sensors are low
and there is no wired sensor the “Room” LEDs on the seeTemp
will scroll up and down and the system will shut down.
37. Can I use multiple wireless
temperature sensors with one
HVAC controller?
Yes, you can use up to four wireless temperature sensors with one
HVAC controller and up to a maximum of five wireless temperature
sensors per main repeater.
38. How accurate is the wireless
temperature sensor?
+/- 1º F
For more information, please contact Technical Support (800.523.9466)
or visit www.lutron.com.
© 04/2011 Lutron Electronics Co., Inc.
P/N 368-2226 REV A
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