Grundfos Geo-Flo Universal Pump Controller Installation, Operating And Maintenance Manual page 9

From heat pump
circuit board
or transformer
* Not all brands have the same wire colors for the pump power block.
Orange = 230 VAC (common)
Yellow = 230VAC (switched) for 1st stage
Red = 230VAC (switched) for 2nd stage
** Relay #1 needed for temperature di erence mode; both relays needed for ow mode.
Figure 2d: Wiring Diagram for heat pumps without an external compressor contactor (compressor relay is on
the circuit board) and without an accessory relay -- see Note A, page 5
CAUTION: DO NOT CONNECT THE MAGNA GEO VARIABLE SPEED PUMP HIGH VOLTAGE
TERMINALS TO THE "T" SIDE OF THE HEAT PUMP COMPRESSOR CONTACTOR. THE HIGH
IN-RUSH CURRENT MAY CAUSE PREMATURE CONTACTOR FAILURE. ALWAYS CONNECT THE
PUMP DIRECTLY TO THE MAINS OR TO THE "L" SIDE OF THE COMPRESSOR CONTACTOR.
SEE APPENDIX C FOR MORE DETAILS.
Geo-Flo offers a panel mount flow center option for pressurized flow centers and a vari-
able speed kit for non-pressurized flow centers. Both products provide factory-wired and
mounted controllers, as well as factory wired thermistors and flow sensor (if equipped).
Field low voltage wiring simply involves running 4 conductor thermostat wiring between
the heat pump and the flow center terminal block, greatly reducing installation time. In
addition, all components necessary for the installation, including the hose kit, are part of
the panel mount or flow center variable speed kit.
C R HP IN1
C R
SPST Relay #1
230
VAC
Pump
Power
Block
Orange* Yellow* Red*
GEO-FLO UNIVERSAL PUMP CONTROLLER: UPC-GEO |
HP IN2
Field
Supplied
SPST Relay #2
Relay(s)**
230
(230V coil)
VAC
Field Wiring (low voltage)
Field Wiring (high voltage)
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