GEO-FLO UNIVERSAL PUMP CONTROLLER: UPC-GEO | 13
ΔT Configuration / Minimum Pump Speed %
The ΔT Configuration menu (Figure 12) is accessed by selecting 1)
ΔT from the Setup Menu when item 4) is set to ΔT. Separate ΔT
values for heating and cooling operation can be specified. The Heat-
ing ΔT will be applied when the controller receives a 24VAC signal
at the left HP IN1 terminal or the left HP IN2 terminal AND the EWT
> LWT (i.e. heat is extracted from loop). The Cooling ΔT will be ap-
plied when the controller receives a 24VAC signal at the left HP IN1
terminal or the left HP IN2 terminal AND the LWT > EWT (i.e. heat is
rejected to loop). A dry contact across the two terminals of HP IN1
or HP IN2 can be used as an alternative to providing a 24VAC signal.
Item 3) MIN% in the ΔT Configuration menu allows for a minimum
pump speed percentage set point. Although not typically used for
residential applications, the pump speed may be set to remain
above a certain percentage RPM regardless of the ΔT setting for
heating or cooling. To change minimum %, press the arrow down
(-) button to select item 3). Press the OK button to select the MIN
% menu (the triangle cursor will turn solid), and use the +/- buttons
to set the value. Once set, press the OK button again to lock in the
value.
Sensor Configuration
NOTE: Selecting the actual sensors installed in the system is critical
to proper controller performance.
The Sensor Configuration menu (Figure 13) is accessed by select-
ing SENSORS from the SETUP menu. Items 1) and 2) are provided
for the various Grundfos Vortex Flow Sensors available including
VFS 1-20, VFS 2-40, VFS 5-100, VFS 10-200, and VFS 20-400. Items
3) and 4) are provided for 10K thermistors. The mapping of the
sensors to the location on the controller circuit board is shown on
the Figure 13 in brackets. To change the type of sensor, press the
OK button to select the item (cursor becomes filled) and use the
+ and – buttons to select the sensor. The UPC-GEO will automati-
cally recognize when a thermistor is connected to the EWT or LWT
thermistor terminals.
Figure 13: Sensor Configuration
SENSOR CONFIGURATION
1) VFS 100-200
[EWT 4-pin connection]
2) VFS 100-200
[LWT 4-pin connection]
3) NONE
[EWT Therm]
4) NONE
[LWT Therm]
Figure 12: ∆T Configuration
NOTE: Menu item 3 is only avail-
able for software version 3.0 and
higher.
∆T CONFIGURATION
1) HEATING ∆T 5 °F
2) COOLING ∆T 12 °F
3) MIN % 0%