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AT C 3 2 U 0 3 C o m m u n i c a t i n g , P r o g r a m m a b l e T h e r m o s t a t - I O M
VARIABLE SPD INTERNAL
PUMP CONFIGURATION
LOOP OPTION
PUMP CONTROL
HEATING STAGE 1
COOLING STAGE 2
COOLING STAGE 1
COOLING STAGE 2
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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
VALVE CONTROL DELTA T
HEATING DELTA T
COOLING DELTA T
MAXIMUM HEAT LWT
MINIMUM COOL LWT
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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.
SINGLE
FIXED
60%
75%
50%
70%
SELECT
Two
connections
on DXM2
board to allow
for multi-unit
installation
0.0
3.6.1 MULTI-UNIT AIRFLOW SELECTION
7 F
In section 3.1, when an installer selects "Airfl ow Selection"
10 F
from the System Confi guration menu, the installer may
choose the unit to confi gure by the last 4 digits of its serial
80 F
number from the following screen.
40 F
SELECT
TT026
TT026
TT038
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R e v. : N o v e m b e r 3 , 2 0 1 7
Or
AIRFLOW SELECTION
S N - - - - - 1 2 3 4
S N - - - - - 5 6 7 8
S N - - - - - 9 0 1 2
SELECT
9
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