Appendix A: Sensor Kit Descriptions - Grundfos Geo-Flo Universal Pump Controller Installation, Operating And Maintenance Manual

The following information provides descriptions of currently available controller kits. Although both kits work
well, there is an advantage to installing the flow and temperature kit, as the ability to directly read heat of
extraction and heat of rejection makes start up and troubleshooting much easier.
1. Controller kit (P/N 3698 & 3766*), Flow and Temperature: This kit allows the installer to control pump
speed based upon flow rate or temperature difference (∆T). The display will show heat pump operating
stage, EWT, LWT, ∆T, flow rate, pumping Watts, and heat of extraction/rejection (Figure 18).
(1) Controller with wall anchor kit
(1) PWM controller-to-pump cable, 10'
VFS10-200 Flow tube, sensor,
(1)
cable, and seals
Brass adapters, 1" Hose Barb X 10-
(2)
200 Flow Tube
G1-1/4 Union nuts (for Flow Tube/
(2)
Adapters)
(4) Hose clamps, stainless steel
10k Thermistors, 1/4" MPT brass
(2)
connection
SPDT Isolation Relay (for ACC & Y2
(2)
input)
*Note: P/N 3766 includes (2) 1" PVC glue
adapters instead of 1" hose barb adapters.
All other components are the same as P/N
3698).
2. Controller kit (P/N 3697), Temperature: This kit allows the installer to control pump speed based upon tem-
perature difference (∆T). The display will show heat pump ON/OFF, EWT, LWT, ∆T, and pumping Watts. Flow
rate and heat of extraction/rejection will not be displayed (Figure 19).
(1) Controller with wall anchor kit
(1) PWM controller-to-pump cable, 10'
(4) Hose clamps, stainless steel
10k Thermistors, 1/4" MPT brass
(2)
connection
SPDT Isolation Relay (for ACC & Y2
(1)
input)
GEO-FLO UNIVERSAL PUMP CONTROLLER: UPC-GEO | 19

Appendix A: Sensor Kit Descriptions

Figure 18: Flow and Temperature Kit (P/N 3698)
Figure 19: Temperature Kit (P/N 3697)