Weiss Instruments iStat/Pro User manual

Your new air conditioning system thermostat has been built using the
best components and design philosophy currently available. As a result,
if properly installed, iSTAT thermostat will provide you with many years of
trouble free comfort.
By taking the time to read and understand these simple instructions
you can take advantage of many of the capabilities that are offered in
this premium product.
Introduction
The iSTAT thermostat is able to be used as a residential programmable
thermostat, a commercial programmable thermostat or as a simple to use
manual thermostat. Your installer will have set these modes to best suit
your individual needs.
For clarity, this user manual is broken into the following main sections.
• Residential Programmable Mode.
• Commercial Programmable Mode.
• Manual Mode.
Common Functions to all modes.
Please Note:
The iSTAT thermostat can be configured by your installer to a large
variety of configurations and functions so that your iSTAT thermostat is
perfect for you and your individual needs. As such, this manual may
describe a function or feature not active on your thermostat.
Clean Thermostat Screen
The thermostat has a touch screen interaction. Follow these steps
to clean the screen without making thermostat changes:
1. Press the Screen key. Thermostat locks out all touch keys
for 30 seconds to allow for cleaning.
2. To cancel the CLEAN SCREEN early, press the Cancel key.
Setting the clock
The iSTAT thermostat is fitted with a real time clock. This clock is used
by the iSTAT thermostat for the programming functions as described below.
It is essential that the clock time and day are set accurately if you require
your programmed events to start on time.
To set the clock, tap the “CLOCK” key. The LCD will show the Hours
Digit flashing. Use the up or down key to adjust the hours to the correct
time (note the AM / PM symbol). Tap the “CLOCK” key again and now the
minute's digits will flash. Adjust this value using the up or down key to show
the correct minute. Tap the “CLOCK” key again and now the weekday
flashes, again use the up or down key to set this value to the correct day
of the week. Tap the “DONE” key again to exit the clock set function.
Your clock is now set.
Residential Programmable Mode
Programming your 4 daily events
The iSTAT is an individual 7-day and 5+2 programmable thermostat.
For each day of the week you are able to have 4 timed set temperature
changes or programmed events. For clarity these events are conveniently
named “WAKE”, “DAY”, “EVENING”&“SLEEP”.
The “WAKE” event may be used to set the temperatures of your
home that you would like to wake to.
The “DAY” event is typically used to set the temperatures you wish
your home to maintain whilst you are away at work.
The “EVENING” event is often used to set the temperature you wish
to be greeted with upon returning home at the end of the day.
The “SLEEP” event can be used to set a comfortable and energy effi-
cient temperature while you sleep. You are permitted to have every event
occur at a different time of the day and set a different heating and cooling
set temperature for each of the 4 daily events. You are also able to set a
heating set point temperature between 41°F to 100 °F. You are able to set
a cooling temperature between 32 °F and Cooling OFF (provided your
installer has not set control limits that restrict this range of adjustment).
Remember, each of the 4 programmed event set temperatures will
hold the home temperature until the next event time arrives where the
new event set temperature will then be used. So The “WAKE” event set
temperature will be the temperature of your home until the “DAY” event
time arrives, then The DAY” event set temperature will be the temperature
of your home until the “EVENING” event time arrives, then The “EVENING”
event set temperature will be the temperature of your home until the
“SLEEP” event time arrives, then The “SLEEP” event set temperature
will be the temperature of your home until the next days “WAKE” event
time arrives.
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Programming your ISTAT thermostat or setting these daily events
is no more complicated than setting the clock as described previously.
The same keys are used in the same sequence. The LCD shows only
relevant information for the event being adjusted thus reducing possible
errors that may be caused by having confusing information displayed
on the LCD.
To enter the program mode. Press “SCHED” key. The display will
change to show the period day and 4-period. Using the PROG DAY
keys adjust the day to the day you wish to start programming or to
the day you wish to edit an existing event or program.
Tap the “WAKE”, “DAY”, “EVENING” & “SLEEP” button to select
period. Using the “PROG DAY” to select workday or weekend or individual,
using the up or down keys to make changes .Use “DONE” key to exit the
program set function
Temperature Override
Holds temperature temporarily until the next scheduled period
time or until the time the user sets.
1. Press Up or Down arrow next to
the temperature you want to adjust.
Hold Temperature until time appears
on the screen. The Hold Temperature
Until time defaults to the start time
of the next scheduled period.
2. Press Up or Down arrow next to the
Time key to set desired time for the
thermostat to resume
3. Press the Cancel or Sched key to cancel
Override Temperature Until and resume schedule.
4. Press Done key.
IMPORTANT
The current day of the week should already be set correctly.
If not, see Installer Setup to set the day.
Permanent Program Hold.
Tap the “HOLD” key to override the
iSTAT programmed time schedule and
hold the currently set temperature. This
set temperature will be maintained until
released by tapping the “CANCEL” key.
The LCD shows the word “P” to confirm
the iSTATtime schedule has been held.
If desired, while the program is held the
current set temperature can be adjusted simply by pressing the up or down
keys. The iSTATthermostat display will change to show the word “SET”,
and the active set point for the current mode (Heating or Cooling). As you
hold the up or down keys the current set point will change. To Review the
set Temperature, simply tap the up or down key to turn the LCD backlight
on, tap the up or down key again and now the LCD will change and display
the currently set temperature(s).
Vacation Hold
Change temperature setting for a designated number of days.
1. Press the Up and Down arrow keys
to set the desired temperature while
away on vacation. Notice that -
Override Until time is shown on
the screen. (This is the time the
Vacation Hold override expires
after the number of days ends.)
2. Press Hold key twice. Screen shows -“Override Until“ one day.
3. Press Up and Down arrow keys to change the number of Days
you desire thermostat to override the schedule.
NOTE: Days Up and Down arrows appear for approximately seven
seconds. Pressing just below Hold Temperature until on the screen
allows the Days Up and Down arrows to reappear.
4. To cancel the Vacation Hold override early, press the Cancel key.
NOTE: When the number of days of Vacation Hold expires, the
screen shows Following Schedule to indicate that Vacation Hold
has ended.
Commercial Programmable Mode
Programming
Your 2 daily events Commercial programming of the ISTAT has been
designed to be an extremely simple and logical process. The ISTAT permits
you to program a DAY time for the air conditioning system, then a Stop
time for each day of the week. When the ISTAT is displaying “DAY” in the
LCD, it will maintain whatever set point has been chosen. When the ISTAT
is displaying “EVENING” in the LCD, it will be OFF (or maintain an energy
efficient maintenance temperature if set by the installer).
To enter the program mode, press the “SCHED” key. The display will
change to show the period day and 2-period.Use PROG DAY button to
select Programming Day. Use DAY and EVENING keys to select period.
Using the up or down keys set the minute to the time you wish the building
air conditioning system to “DAY” for the currently elected day.
After hours Run Timer For convenience
The installer may have set the after hours run function. This function
permits you to temporarily turn the iSTAT on for a set period of time, at the
conclusion of which the iSTAT will automatically turn back off again. To acti-
vate the after hours run timer, simply tap the “HOLD” key.
(Or if fitted, the “After Hours” run key fitted to the remote room temperature
sensor.) The LCD will show the word “TIMER” flashing in the LCD. Tapping
the “CANCEL” key (or after hours key on the remote sensor) again will
cancel any unexpired part of the timer and the iSTAT will switch back off.
To Review the set Temperature, simply tap the up or down key to turn the
LCD backlight on, tap the up or down key the LCD will change and display
the currently set temperature(s).
Manual Mode
To set your desired temperature simply press the up or down keys. The
iSTAT thermostat display will change to show the word “SET”, and the
active set point for the current mode, (Heating or Cooling) As you hold the
up or down keys the current set point will change. If Auto mode is selected,
after adjusting the Heat set point wait without touching a key for 3 seconds
for the iSTATthermostat display to change to show “Cool” and “SET” and
your current cooling set temperature. If desired change this value with the
up or down keys. Use “DONE” key exit this menu. Your new set tempera-
tures will be maintained.
Switching between day and evening set points
The iSTAT will keep two sets of temperature in its memory (if enabled
by your installer), typically used for day and night temperatures. This
provides you with a quick and simple way to change between your day
and evening time set temperatures. Simply tap the “SCHED” key to
switch between Day & Evening Modes. Set the Day and separate
Evening temperatures as described previously.
CANCEL
FAN
MED
FAN ON
Room
Override Unit
Cool On
CANCEL
FAN
MED
FAN ON
Room
Permanent Override
Cool On
CANCEL
FAN
MED
FAN ON
Room
Override Unit
Cool On
DAYS

Turning your thermostat OFF
To turn your iSTAT Off, simply tap the “SYSTEM” key until the LCD
shows the word “OFF”.
To Review the set Temperature.
Simply tap the up or down key to turn the LCD backlight on and now
the LCD will change and display the currently set temperature(s).
Common Functions
The Keys Explained
System key
Tap this key to cycle the iSTAT thermostat through the available modes,
Heat only, Cool only, Auto season change over mode, Emergency Heat (if
fitted), and OFF. (Note - Not all modes may be active on your iSTAT)
NOTE, the installer may have activated the Anti freeze function where
your heating system will turn on whenever the room temperature falls
below 5 °C (41°F), regardless of the currently selected mode or whether
the iSTAT is On or Off.
Hold key
Commercial Programmable Mode.
This key initiates the after hours run timer where, for an installer
programmed period the iSTAT will replace the stop program temperatures
and temporarily use the start program temperatures to maintain the
building temperatures.
Residential Programmable Mode.
The “HOLD” key is used to override the current programs time sched-
ule and to hold the currently set temperature indefinitely. This set tempera-
ture will be maintained until released by tapping the “CANCEL” key. Timer
will be displayed in the LCD to confirm this function is active.
Temperature up key
Use temperature up key to increase the desired room temperature for
the heating or cooling modes, or increase a “value” in programming modes.
Also used to force override the preprogrammed temperatures and
temporarily replace them with a new higher set temperature.
Temperature down key
Use temperature down key to decrease the desired room temperature
for heating or cooling modes, or decrease a “value” in programming
modes. Also used to force override the preprogrammed temperatures and
temporarily replace them with a new lower set temperature.
Clock key
Tap the “CLOCK” key to begin setting the clock.
Sched key
Press the “SCHED” key to begin programming your daily events.
In Manual mode: Tap the “SCHED” key to switch between Day & Night
modes.
Fan key
Fan Single Speed Fan systems. Tap this key to cycle between
Continuous Fan (Fan ON) and Auto Fan. Three Speed Fan systems -
Tap this key to cycle between the 7 available fan modes being Low
speed, Medium speed, High speed & Auto Fan speeds in auto fan
mode and then Low speed, Medium speed, High speed in Fan ON mode.
If the iSTAT is OFF, tapping the “FAN” key will turn the fan ON or OFF
as desired. If your system has 3 fan speeds these can also be selected
by tapping the “FAN” key.
Wake Day Evening Sleep key
Tap this key can select period in programming mode.
Reset key
Tap Reset key to clean filter count.
Prog Day key
Tap this key to select project day in programming mode.
Cancel key
Tap this key to Cancel override mode and setting clock mode and etc.
Done key
Tap this key to finish setting.
Control Modes
Heat Only Mode
The iSTAT thermostat will turn on the Heating mode when the room
temperature falls below the Heat set point temperature. In Heat only mode
the iSTAT thermostat will NOT bring on the Cooling regardless of the room
temperature and the Cooling Set point temperature. In Heat only mode,
only the word “Heat” will be displayed in the LCD. When your iSTAT is
calling for heat, the word “Heating” will be displayed in the LCD. If the
word “Heat” is flashing in the LCD the iSTAT is performing a safety anti
cycle delay prior to restating the heating.
E. Heat Mode
The iSTAT thermostat will only use your emergency heating device to
maintain your desired heating temperature. This method of heating can
be quite expensive therefore it is not recommended to use emergency
heat mode unless it is essential. When your air conditioning system is
heating using emergency heat, the word “E.Heat” in the LCD will change
to the word “E.Heating”.
Cool Only Mode
The iSTAT thermostat will turn on the Cooling when the room
temperature rises above the Cool set point. In Cool only mode the
iSTAT thermostat will NOT bring on the Heating regardless of the room
temperature and Heating set point temperature. In Cool only mode, only
the word “Cool” will be displayed in the LCD. When your air conditioning
system is cooling, the word “Cool” in the LCD will change to the word
“Cooling”. If the word “Cool” is flashing in the LCD the iSTAT is performing
a safety anti cycle delay prior to restarting the Cooling.
Auto change Over Mode
The iSTAT thermostat will turn on the Heating if the room temperature
falls below the Heat Set point temperature and the Cooling if the room tem-
perature rises above the Cool Set point. This is the recommended mode as
it provides automatic control of the air conditioning system to maintain the
desired room temperature. Auto changeover mode is indicated by both the
words “Heat” & “Cool” in the LCD. If the word “Heat” or “Cool” is flashing in
the LCD the iSTAT is performing a safety anti-cycle delay prior to restating
the air conditioning system.
Fan Functions Explained
Auto Fan Mode
If the user has selected Auto Fan mode with the “FAN” key the indoor
fan will turn on when the heating or cooling turns on, and off again once
the heating or cooling turns off. To conserve energy your fan may continue
to run momentarily after the heating or cooling has stopped to extract all
the warm or cool air still remaining in the air condition system and bringthat
conditioned air into the building.

Fan On Mode
Manual Thermostat Mode
Your fan will run continuously.
Residential Programmable Mode
By selecting “Fan On” or continuous fan mode the iSTAT thermostat
indoor fan “may” operate continuously between “WAKE” programs and
the “SLEEP” programs and then turn on and off as required with heating
and cooling outside of those programmed events.
Commercial Programmable Mode
By selecting “Fan On” or continuous fan mode the iSTAT thermostat
indoor fan “may” operate continuously between “DAY” programs and the
“EVENING” programs and then turn on and off as required with heating
and cooling outside of those programmed events.
Please Note - Your installer may have activated some of the many
advanced indoor fan management capabilities of the iSTAT thermostat
that work in partnership with the Fan On Mode. This may result in the
fan operating differently than described above. If you find this to be the
case and undesirable, please contact your authorized service agent for
advice on altering the function.
Fan Speeds Single Fan Speed
If your air conditioning system has one fan speed, your iSTAT
thermostat will display the fan information shown on the picture below
left The words “High”,“Med” or “Low” will be absent from the LCD.Tapping
the “FAN” key with permit you to select either “Fan On mode”
or “Auto Fan mode” as described above.
Three Fan Speed
If your air conditioning system is fitted
with 3 fan speeds your iSTAT thermostat
will display the fan speeds as shown on
the picturet to the right.Tapping the “FAN”
key will step the fan speed selection
through “Low”, then “Med(ium)”, then
“High” fan and Auto fan speed(indicated
by all three fan speeds being shown on
the LCD)in auto fan mode, the “Low”
“Med”(ium) and “High” in Fan On mode.
If auto fan speed has been selected the
iSTAT thermostat will indicate the
automatically selected fan speed by
flashing in appropriate word in the LCD.
If Auto Fan Speed has been selected your
iSTAT thermostat will automatically select
the most appropriate fan speed based on
the difference between the room and set
temperatures.
LCD Explained
Padlock Symbol.
Whenever this symbol is shown, a control limit has been
reached and key or a function has been locked out.
“Spanner” Icon. I
If you see a spanner ICON flashing on your LCD, the
installer has left your thermostat in “Commissioning mode”.
Although your thermostat will operate your heating and
cooling system whilst in “commissioning mode”, all active
safety and energy conservations delays have been disabled.
It is therefore HIGHLY recommended that you contact your
installer and request that the installer mode be disabled.
TEXT “Locked”.
The temperature of the outside air can initiate or prevent certain
functions within the iSTAT thermostat control logic. If such a function has
been prevented based on the outside air temperature, the word “LOCKED”
appears. These functions will automatically “unlock” once the outside air
temperature becomes favorable.
TEXT “RENEW FILTER”.
When the “RENEW FILTER” show LCD display,it reminds you to clean
or replace your return air filter. Once you have cleaned or replaced your
return air filter PRESS RESET keys. The “RENEW FILTER”will
disappear and the filter counter will reset back to 000 hours.
TEXT “RECO”.
If the iSTAT Adaptive Recovery mode is active, the iSTAT will pre warm
or pre cool your building to ensure your set temperatures are reached by
your scheduled event start time. Whenever the iSTAT is performing a
pre warming/cooling the word “Recovery” will be shown on the LCD.
Note: Your iSTAT thermostat is capable of many advanced
control capabilities, designed to both save energy and improve
comfort levels. If any part of the iSTAT display is flashing
during normal use, a safety, energy management or program
delay/override is in progress. This is normal and is no cause
for concern.
FAN
MED
FAN ON
Room
Cool On
HOLD
Running As SCHED
FAN
MED
FAN ON
Room
Cool On
HOLD
Running As SCHED