Only operates if TT=OC. This is the heating temperature that will be used in
“
Occupied
mode” and will temporarily replace the user heat set point while the TT terminals are
shorted together.
oC=OFF Occupied Mode Cool Set.
Only operates if TT=OC. This is the cooling temperature that will be used in
“
Occupied
mode” and will temporarily replace the user cool set point while the TT terminals are
shorted together.
SP=2 Stage 1 Span
Hysteresis for Stage 1. (difference between heating and cooling turning on and off) Sp=1
0.5c SP=2 1.0c Sp=3 1.5c.
Sd=2 Stage 2 Span
Hysteresis for Stage 2. (difference between heating and cooling turning on and off) Sd=1
0.5c Sd=2 1.0c Sd=3 1.5c.
DT=35 Upstage delay time
Time in minutes before next stage of heating or cooling is to be called. Delay only
operates if stage trip temperature has not yet been reached. Adjustable between 10 ~ 90
Minutes in 5 minute steps.
OS=0 Optimised Start/stop. (Adaptive Recovery)
OS=0
‐
Optimised start/stop function Off.
OS=1
‐
Optimised start/stop function running.
C2=0.0 Calibration Remote Sensor
Calibration Offset for the TT terminal temperature sensor. Adjustable range +/
‐
5 deg C
(+/
‐
9 F).
Co=0(41F) Cooling OFF temperature.
Only operates if TT=OA and outside temperature sensor is fitted. Outside air
temperature below this value will force the cooling function OFF. Adjustable between 5
~37c. (41~98F).
Ho=35 (95F) Heating OFF temperature.
Only operates if TT=OA and outside temperature sensor is fitted. Outside air
temperature above this value will force the heating function OFF. Adjustable between 5
~37c. (41~98F).
HB=37 (98F) High Balance Point.
TT=OA, the outside temperature sensor must be fitted and Sw 1=off. 2nd (or 3rd) stage
heating is locked out when the outside air is above this temperature. Adjustable between
5 ~37c. (41~98F).
LB=9.5 (15f) Low Balance point.
TT=OA, the outside temperature sensor fitted, H3=EH, Sw 1=off and Sw2=on. Outside
temperatures below this value will automatically select Emergency Heat mode.
Adjustable between
‐
9.5 ~37c. (15~98F).
Ft=off Filter warning time Return air filter cleaning warning time.
Adjustable between off and 900 hours. Ad=07 Modbus Address. Modbus
communications address
Cd=01 Commissioning Mode..
Cd=0
‐
Commissioning mode is OFF.
Cd=1
‐
All time delays are off or reduced to a very small value.
tS=0 Factory test mode
TS=0
‐
Factory test Mode OFF. TS=1
‐
Display configuration code.* TS=2
‐
Step
cycle all relays in sequence, 1 2 3 4 5 etc.
Control logic
Single Set Point mode Two Set
Point mode This simple diagram
provides a general insight into
the control logic of the A4100
thermostat. It attempts to
describe the action of the
DB=XX, the SP=XX and SD=XX
advanced installer control
capabilities in both two set point and single set point mode. By adjusting these three
values to suit the needs of the user or equipment extremely tight temperature control can
be achieved, or a more energy efficient temperature control profile can be set.
In single set point mode (sw8=off) the individual heating and cooling set points are
replaced by a
“
Dead Band” where the heating and cooling differential is controlled by a
installer set value. This is the simplest method of temperature control.
Commissioning
As with any thermostat, commissioning ensures that the thermostat and the equipment
connected to it are operating correctly and as expected. Although the A4100 is a
multifunctional thermostat, commissioning is quite a simple process. Follow the steps
detailed below and use the trouble shooting guide if you encounter a problem.
When the thermostat is fitted to the base plate and when 24VAC power is first applied,
the LCD should briefly show all available segments (a LCD function test), then display
the time and operating mode etc.
The A4100 is fitted with a number of safety and energy saving time delays. If desired,
these can be disabled for commissioning purposes by entering the
installer mode and setting the CD=00 value to read CD=01. After exiting
the installer menu you will note a
“
Spanner” icon flashing on the LCD to
remind you that commissioning mode is ON. After commissioning has
been completed it is important to disable commissioning mode by
entering the installer menu once again and setting the CD=01 value back
to CD=00.
NOTE:when in commissioning mode ALL time delays are either OFF or
reduced to a extremely low value, it is therefore normal to potentially call for 3rd stage
heating almost instantly 0.5deg below the heating set point.
If you choose not to use commissioning mode you may see various words and Icons
flashing in the LCD when ever a time period is in use. For example, the word
“
HEAT”
may flash to indicate heating is required but being held off by the 4 minute anti
‐
cycle
timer. Or the word
“
HEATING” may be flashing to indicate set point has been achieved
however heating is being held ON by the minimum run timer.
The golden rule with the A4100 is anything that flashes is a time period overriding what
would normally be expected to occur; either a function is being held on or off
momentarily. Please be patient.
Test fan operation.
With the thermostat OFF (tap the mode key to show OFF in the LCD). Simply tap the fan
key to cycle through the available fan speeds. As the LCD changes to show the fan
speed or fan mode you should here faint
“
clicks” as the A4100 internal relays change,
the equipment fan speed should change accordingly.
Test heating and cooling (if both fitted).
Turn the A4100 to Auto season change mode by tapping the mode key until the words
“
Heat” and
“
Cool” are shown on the LCD.
Using the temp + or Temp
–
key set the desired temperature a few degrees below the
ambient temperature. After a few moments you will hear a click and the word
“
Heat” will
change to
“
Heating”. Verify that the heating system is on and operating correctly.
Using the temp + or Temp
–
key set the desired temperature a few degrees above the
ambient temperature. After a few moments you will hear a click and the word
“
Cool” will
change to
“
Cooling”. Verify that the cooling system is on and operating correctly.
Tap the mode key turn the A4100 OFF. After any necessary timers have expired all
heating, cooling and fan functions should stop. Verify that the system has shut down.
NOTE:in HP mode (SW2=ON) it is normal for the reversing valve to remain energised
after the compressor has stopped. This is done to prevent
“
decompression HISS” and
to limit the wear on the reversing valve. 30 minutes after the last reversing valve use it
will deenergise to conserve power.
This commissioning of the A4100 is complete. If commissioning mode has been used it
is important that the function be turned OFF before handover to the user.
Using the User Manual as a guide set the real time clock and the preferred user
programme (if applicable). Explain equipment & thermostat operation to the user.
Commissioning is complete.
Using Remote Temperature
Single or multiple room
air temperature
sensors can be
connected to the
A4100
“
TT”
terminals if temperature
averaging over a
larger area is
desired. Shown are 4 examples of
commonly used sensor configurations.
Note
‐
Either TT=RS (remote sensor) or
TT=Av (Averaging sensors) value must be
set in the advanced installer menu for
these sensors to be used.
Please note the configuration of RS
‐
01 &
RS
‐
02 sensors in the examples provided
above. Other sensor configurations are
also available.
When used in Start / Stop commercial programmable mode
(SW6=on SW8=off),the after hours run timer
can be toggled on or off as required with a
momentary press key on the remote sensor.
See figure 14 Left.
As the A4100
“
Auto detects” sensors
connected to the Switch Override Switch
“
TT” terminals, temperature sensors can
also be switched on and off as required
by placing a switch in the sensor wiring
to open circuit the sensor loop. See figure 13 Right.
Advanced Functions
Modbus Communications
The A4100 has integrated Modbus communications capabilities where, using a remote
PC or building Direct Digital Control (DDC) system may view or adjust any of the A4100
functions remotely.
It is not the scope of this manual to provide detail on the communication capability of the
A4100.
The communications port of the A4100 has 3
terminals marked
“
A”,
“
B” &
“
C”. Terminals
“
A”
&
“
B” are used for communication, terminal
“
C” is
used as a screen ground to protect the integrity of
the Acommunication signal. To Network maximum
of 35 A4100 can be connected to any single hub.
Each A4100 on the hub must have a unique network address (factory default is 7).
These settings are adjustable from the advanced installer menu.
Factory Test Mode
The A4100 is fitted with a simple factory Test Mode where you can confirm that all relays
outputs functions and the current configuration of the thermostat.
Ts=0 Factory Test Function is OFF
Ts=1 Test current switch configuration. The A4100 will display a unique code that will
identify the current switch settings.
Ts=2 The A4100 will cycle each of its relays on then off in an endless loop.
High and Low balance points
The A4100 is fitted with both High and Low Balance Point control capability. For these
functions to operate the Installer setting must be TT=OA (outside air temperature sensor
fitted), the outside air sensor must be installed and SW1 must be OFF (Single fan speed
mode).
High Balance point
Set the installer menu value
“
HB=XX”. When the outside air temperature is above this
value, second or third stages of heating are held off regardless of the room and set
temperature. Set this function to prevent the excessive consumption of energy when the
outside air temperature is warm enough not to require additional heating stages to be
used.
Low Balance point
SW2=on, W3 =EH (Emergency Heat Mode) Set the installer menu value
“
LB=XX”.
When the outside air temperature is below this value the A4100 will automatically switch
to emergency heat mode when only use the emergency heating system when heating is
required. If the outside temperature is above this LB=XX value the emergency heat
mode can be selected manually at anytime with the
“
PROG DAY” key.
Setting up the Heat & Cool Off functions
To conserve energy, the A4100 can suspend the heating or cooling functions if the
outside air temperature is within a prescribed installer set range. If the outside air
temperature is above the HO=XX (heating OFF) value, heating will not be called
regardless of the room and set temperature. If the outside air temperature is below the
CO=XX value, cooling will not be called regardless of the room and set temperature.
“
Heat” or
“
Cool” and the word
“
Locked” will flash on the LCD to show that these
modes have been restricted.
Adaptive recovery
Only available in programmable mode (sw6=on). The adaptive recovery function of the
A4100 permits the user to program a time that a desired set temperature is required,
letting the thermostat calculate the most energy efficient time to turn on to achieve the
desired temperature at the selected time.
For example, if the user typically returns home at 5:00pm at the end of the work day,
setting program #3 (if used in residential programmable mode) to 5:00pm the A4100 will
calculate the most energy efficient time based on set, room temperature and history of
temperature change to bring on the Equipment to meet the set temperature by 5:00pm.
Adaptive recovery may also prevent the A4100 from running for a few moments just prior
to a program change occurs.
“
recovery” is shown in the LCD when ever Adaptive
recovery is being used.
Specifications
Input Voltage 24VAC 50/60 Hz +/
‐
15%.
Relay rating 24VAC @ 1Amp maximum per relay.
Operating Temperature 0
‐
50C (32 to 122F).
Operating RH 0
‐
95% (non condensing).
Storage Temperature 0
‐
65C (32 to 150F).
Size 113 x 103 x 23mm. Display Size 74 x 55mm.
Temperature Sensor(s) 10K NTC type 3.
Accuracy +/
‐
0.3deg C @ 25 C. (77F)
Stage Delays Minimum temperature change over time method.
Timed upstage Delay 5~90 minutes.
Anti
‐
cycle Delay Off to 4 minutes.
Maximum hourly cycles Unlimited, 30, 10 or 6. (Installer set)
Display resolution 0.5 deg C (1F).
Control Range Off to 38c (100F).
Outside Air temp display range
‐
8 ~ +60c (17 ~ 140F).
Back light Blue EL. Backlight life 3,000 hours to half brightness.
Optimised Start/Stop method Time to start vs temp differential method
‐
updating.
Communications Protocol Modbus
–
contact factory for objects list.
Fan speeds Based on difference between room and set temp.
Approvals FCC (Part 15) (pending), C
‐
tick.
Warranty 3 years
Sensor Reference Table
K
Ω
24.3 22.0 20.0 18.1 16.2 14.3 13.7
C 6 8 10 12 14 16 18
F 42.8 46.4 50 53.6 57.2 60.8 64.4
K
Ω
12.5 11.4 10.4 10.0 9.57 8.75 8.05
C 20 22 24 25 26 28 30
F 68 71.6 75.2 77 78.8 82.4 86
Troubleshooting
Symptom
Suspected Fault
Suggested remedy
Temperature
Air from the wall cavity may be
Plug holes in wall with tape
leaking into therear of the thermostat
/ sensor enclosure.
to prevent leaks
The internally fitted temperature
sensor is foldedback inside the
Chameleon and not beingexposed to
the room air temperature.
Carefully move the room
temperaturesensor bead
so that it is just behind
thesensor opening in the
case.
External heat or cool source such as
lamps,televisions or drafts from open
doors affecting the accuracy of
sensor.
Move lamps, vents or
other sources of abnormal
temperature away from
sensors
display seems
inaccurate
Sensor calibration may setting are
incorrect
Adjust C1=XX value in
installer mode to correct
perceived sensor
inaccuracy.
“Locked”
appears on LCD
and heating or
cooling will not
operate.
This is not a fault.Outside air temp to
high to require heating Outside air
temp to low to require cooling.
The Ho=XX &/or Co=XX
value is inhibiting heating
or cooling calls. Change
these values in the
installer menu,
A4100 incorrectly set to HP mode.
(A4100 keeps reversing valve
energised after eating / cooling has
stopped to limit ecompression noise
from AC system.)
Set SW2=OFF and retest
heating & cooling
operation.
Minimum run period has not yet
expired. Words Heating” or “Cooling
flash in the LCD
Sw7 sets minimum run
period from 2 or 6
minutes.
Heating or
cooling runs in
dead band.
Compressor and reversing valve
wiring crossed in HP mode (sw2=on)
Check W1 & Y1, Y2 for
correct connections.
Wall controller
has no display
Power failure or faulty A4100
Check for 24VAC on the
24 & 24C terminals
Reversing valve
remains
energised after
heating or
cooling has
stopped.
This is not a fault
The reversing valve
remains energised after
the heating/cooling has
stoped to limit
decompression hiss.
Reversing valve will
deenergise within 2 hours
of the last call.
Spanner
Symbol flashes
on LCD
This is not a fault Commissioning
mode enabled.
Exit commissioning mode
before handover to user.
E.Heat or
E.Heating is
shown on LCD
without
manually
selecting it.
This is not a fault.
LBP reached, outside air
too cold for reliable
HP operation. Set LBP
with the LB=XX value
in the installer menu,
The word OFF
is flashing in the
LCD. Mode
button has no
effect.
This is not a fault
TT=Of in advanced
installer menu.
Some buttons
do not appear to
operate.
Padlock is show
on LCD.
Key board lock is on.
LC=XX value in advanced
installer mode set
the lock values.
Cannot enter
heat or cool
modes
A4100 thermostat set for Heating or
cooling only modes
Heating or cooling mode
not available on your air
conditioning system.
Cannot set
heating and
cooling to
desired value.
Padlock symbol
flashes
This is not a fault.
HL=XX (heating set point
limit) and CL=XX (cooling
set point limit) restrict
control range..
Outside air temperature air sensor
has failed.
Check wiring and outside
air sensor. Replace
outside air sensor
Outside Air
Temp display
is showing
dashes
No outside air sensor fitted.
Change TT=AO to TT=RS
in advanced installer
menu.
“Heat” or “Cool”
is flashing in the
LCD. Heating or
cooling has not
started.
This is not a fault. Heating or cooling
will start shortly.
Anti cycle delay in
progress. This can be
disabled if required for
commissioning.
The Fan runs
on for some
time after the
heating or
cooling stops,
even when I
turn the A4100
OFF.
This is not a fault.`
The fan purge mode is set.
FP=XX value
A4100 displays
wrong
mode (C or F).
The A4100 can operate in both Deg
C and Deg F mode as set in installer
menu.
Check the CF=XX value
Can not select
multiple fan
speeds
A4100 set for single fan speed
Sw=OFF
Turn SW1 to ON. NOTE, 3
fan speed mode can only
be used on single stage
systems.
FAN ON
Room
SCHED
CLOCK
SCREEN
SYSTEM
.
COOL
FAN
MON
MED
Cool On
Recovery
PM
HOLD
DAY
