ACDU01 Communicating Service Tool
Rev.: 23 Oct., 2012
6Geothermal Heat Pump Systems
3.4 PUMP CONFIGURATION
vFlow™ vs internal flow control pump can be controlled either
through temperature differential (Delta T) or can be set to
specific speed (fixed; % of full speed for each heat and cool
stage).
Configure temperature differentials at the thermostat for
vFlow™ units with an internal flow control pump.
Adjust the Pump Configuration 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)
Maximum Heat LWT (valid range based on specific model;
refer to model IOM). Minimum Cool LWT (valid range based
on specific model; refer to model IOM).
NOTE: Refer to section 3.6.3 for multi-unit configuration
instructions.
To control vs pump by fixed speed, select ‘Pump Control’,
press , use down arrow to select ‘Fixed’, and press to
save.
Default stored in control. Valid range: 15% - 90% (in 1%
increments)
Heating Stage 1 Cooling Stage 1
Heating Stage 2 Cooling Stage 2
If Pump Configuration is set to ‘VS PUMP PARALLEL’, valid
range changes to 50-90% (in 1% increments).
3.5 VALVE CONFIGURATION
Configure temperature differentials at the thermostat for
vFlow™ units with a motorized modulating valve.
Adjust the Valve Configuration 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 configured with the appropriate values.
NOTE 2: Refer to section 3.6.3 for multi-unit configuration
instructions.
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.
VARIABLE SPD INTERNAL
PUMP CONFIGURATION
PUMP CONTROL DELTA T
HEATING DELTA T 7
COOLING DELTA T 10
MAXIMUM HEAT LWT 80
MINIMUM COOL LWT 40
PREVIOUS SELECT
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
MODULATING VALVE
CONFIGURATION DEG
HEATING DELTA T 8
COOLING DELTA T 15
PREVIOUS NEXT
MODULATING VALVE
CONFIGURATION
OFF POSITION 3.8
PREVIOUS SELECT
