HOMA GRP Series - Manual (Page 10)

GRP Series
Installation, Operation & Maintenance Manual
Capacitor Sizing Chart
GRP 10 to 21/1 25 µf @ 370V Run Capacitor - 50 µf @ 330V Start Capacitor-PN#:8857005
GRP 26/1 40 µf @ 370V Run Capacitor - 80 µf @ 330V Start Capacitor-PN#:8857010
GRP 28 - 41/1 50 µf @ 370V Run Capacitor - 50 µf @ 330V Start Capacitor-PN#:8857015
GRP 44/1
70 µf @ 330V Run Capacitor - 320 µf @ 330V Start Capacitor-PN#:8857084
GRP 58/1 120 µf @ 370V Run Capacitor - 200 µf @ 330V Start Capacitor-PN#:8857025
GRP 78/1 120 µf @ 370V Run Capacitor - 300 µf @ 330V Start Capacitor-PN#:8857030
GRP 59/1
100 µf @ 370V Run Capacitor - 350 µf @ 330V Start Capacitor-PN#:8857085
GRP 79/1 120 µf @ 370V Run Capacitor - 350 µf @ 330V Start Capacitor-PN#:8857090
7.5 HP and larger motors require multiple run and start capacitors to achieve the necessary
capacitance value. Refer to the capacitor wiring diagram supplied with each capacitor kit.
Single Phase Pump Start-Up Procedure
Run Capacitor sizing can vary depending on the incoming supply voltage provided. HOMA Single Phase
pumps are provided with Start and Run Capacitor(s) sized for 220-230V under load. Frequently, the
available line voltage is considerably different than indicated, and the Run capacitor(s) may need to be
resized to match the available field voltage. The following procedure will allow you to verify proper
operation of your single phase pump, and/or make necessary changes to your capacitors to correct for
your power supply.
After verifying wiring is in accordance with your pump requirements, start pump and record the following
readings from each of the (3) pump cable leads.
Current under load:
U1 _________
Amps
, > U2 __________
Amps
, > Z2 __________
Amps
Should be (highest reading) (middle reading) (lowest reading)
Lead U1 (common) should have the highest current reading. Lead Z2 (start) should have the lowest
reading.
If Z2 current draw is greater than the current draw of either U1 or U2, a smaller size Run capacitor (lower
microfarad rating) is required to correct the condition. Example: If a 60 µf Run capacitor was supplied,
change to a 50 µf Run capacitor and check current readings. Typically, only one step down in capacitor
size is required, but in certain instances 2 steps may be required.
( ) The standard capacitor kit provided includes: ____________µf start capacitor
____________µf run capacitor
( ) Additional run capacitors have been included for use in tuning the pump to match available line
voltages for optimum performance.
___________µf run capacitor
___________µf run capacitor
___________µf run capacitor
This form is provided for your use in optimizing the performance and service life of your single phase
pumps, and is applicable to most Capacitor Start and Run motors. Please contact our Technical Service
Dept. @ (203)-736-8890 with any questions or if you require any additional information or assistance.
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