9
AT C 3 2 U 0 1 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
R e v. : 4 F e b . , 2 0 1 3
MODULATING VALVE
CONFIGURATION
DEG
HEATING DELTA T 8
COOLING DELTA T 15
PREVIOUS NEXT
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.
VARIABLE SPD INTERNAL
PUMP CONFIGURATION
PUMP CONTROL FIXED
HEATING STAGE 1 60%
COOLING STAGE 2 75%
COOLING STAGE 1 50%
COOLING STAGE 2 70%
PREVIOUS SELECT
3.5.1
MODULATING VALVE OFF POSITION
Click Next from section 3.5 to select the off position
value for the modulating valve.
NOTE:
For certain commercial multi-unit
applications, the modulating valve can be kept
slightly open by choosing values 3.3-4.0.
MODULATING VALVE
CONFIGURATION
OFF POSITION 3.8
PREVIOUS SELECT
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.
Two
connections
on DXM2
board to allow
for multi-unit
installation
Or
