Page 16 of 20 / OM 897
“When my a/c. turns off, I can’t immediately make it run
again?”
This is normal. What you are experiencing is called in anti short-
cycle delay. Because of high pressure in the air conditioning
compressor system, it’s not a good idea to start your air
conditioner immediately after it has just shut down. The T9000
prevents this from happening by imposing a 3-minute delay.
“I just installed the thermostat and the antenna symbol
comes and goes. What should I do?”
A poor RF signal between the thermostat and one or more RCNs
is the cause. The further away the thermostat and RCN are from
each other, the weaker the signal becomes. Distance and also
building materials, particulary metals, will block the RF signal
energy. Sheet metal is very often the problem. Changing the
position of the RCN or thermostat or both may be required. In
rare cases, where the RCN is heavily shielded, a small section of
sheet metal may need to be removed and if necessary replaced
with plastic or other nonmetallic material.
Note: Always seek competent professional electrical and HVAC
contractors when working with your heating and cooling system
and the electrical wiring in your home or other property. For
safety and warranty reasons, always consult with a HVAC
contractor and/or the original equipment manufacturer before
making changes.
“The display on my thermostat is blank. What
happened?”
A blank display indicates your batteries are depleted. When the
low battery icon comes on there is approximately one week of
battery life remaining (see the Batteries - Installing/Changing
section of this manual for information on changing the batteries).
We recommend that when you change batteries, always use
batteries that you know are fresh. Use four (4) new high quality
AA batteries. If you’re using the T9000 to control a heating
system, we recommend as a general practice, putting fresh
batteries in at the start of the heating season.
“If I am away for an extended time such as vacation,
how do I set the thermostat so my system does not run
excessively ?”
You have a couple of choices. The first is to press the HEAT/
COOL button on the thermostat until the display reads “OFF”
(Particularly during the heating season, we do not recommend
going to the “off” mode.) The second option is to put your
thermostat in manual mode by pressing the RUN button. You
know that you’re in the manual mode because none of the period
icons, Morning, Day, Evening, or Night will be displayed.
The “Hold” icon located above the set point temperature will
be displayed (Refer to Figure 7). Next, adjust the set point
temperature to minimize system operation. For example, you
could adjust to a set point of 85°F in cooling, or 65°F in heating,
