9
AT C 3 2 U 0 3 C o m m u n i c a t i n g , P ro g r a m m a b l e T h e r m o s t a t - I O M
R e v. : N o v e m b e r 3 , 2 0 1 7
VARIABLE SPD INTERNAL
PUMP CONFIGURATION
LOOP OPTION SINGLE
PUMP CONTROL FIXED
HEATING STAGE 1 60%
COOLING STAGE 2 75%
COOLING STAGE 1 50%
COOLING STAGE 2 70%
PREVIOUS SELECT
Two
connections
on DXM2
board to allow
for multi-unit
installation
Or
3.5 VALVE
CONFIGURATION
Confi gure temperature differentials at the thermostat for
vFlow™ units with a motorized modulating valve.
Adjust the Valve Confi guration settings using the up/down
arrow buttons. Press the center button to select each item.
• Heating Delta T (default stored in control) –
valid range: 4 to 12ºF (in 1ºF increments)
• Cooling Delta T (default stored in control) –
valid range: 9 to 20ºF (in 1ºF increments)
NOTE 1:
Minimum and Maximum degree values are shown
only when the control is confi gured with the appropriate
values.
NOTE 2:
Refer to section 3.6.3 for multi-unit confi guration
instructions.
MODULATING VALVE
CONFIGURATION
OFF POSITION 0.0
VALVE CONTROL DELTA T
HEATING DELTA T 7 F
COOLING DELTA T 10 F
MAXIMUM HEAT LWT 80 F
MINIMUM COOL LWT 40 F
PREVIOUS SELECT
For certain commercial multi-unit applications, the modulating
valve can be kept slightly open by choosing an off position
value between 3.3-4.0.
NOTE:
Off position 0.0 means that the value is fully closed
when the unit is not operating.
3.6 MULTI-UNIT
CONFIGURATION
If multiple units are connected to one ATC thermostat upon
unit start-up, the thermostat will automatically register the
serial numbers of all units connected to it.
NOTE
: Multiple units may be connected directly to the ATC
thermostat or connected to one another in series, as shown
by the fi gure below.
3.6.1 MULTI-UNIT
AIRFLOW
SELECTION
In section 3.1, when an installer selects “Airfl ow Selection”
from the System Confi guration menu, the installer may
choose the unit to confi gure by the last 4 digits of its serial
number from the following screen.
AIRFLOW SELECTION
TT026 S N - - - - - 1 2 3 4
TT026 S N - - - - - 5 6 7 8
TT038 S N - - - - - 9 0 1 2
PREVIOUS SELECT
