Cummins/Onan — Convert Day Tank Controller from 240 VAC to 120 VAC
Installation · Day tank fuel pump control
From a Cummins/Onan service manual covering: 1000DFHD-60 / 900DFHD-50, 750DFHA-60 / 620DFHA-50, 800DFHB-60 / 700DFHB-50, 900DFHC-60 / 800DFHC-50. Check it applies to your exact model before use.
Applies to: Cummins/Onan DFHA, Cummins/Onan DFHB, Cummins/Onan DFHC, Cummins/Onan DFHD, Cummins/Onan QST30 engine, Cummins/Onan QST30-G1 engine, Cummins/Onan QST30G2 engine, Cummins/Onan QST30-G3 engine, MTU QST30G3 engine
Procedure
- Remove the two jumpers between terminals TB1-6 and TB1-7 and connect one between TB1-5 and TB1-6 and the other between TB1-7 and TB1-8.
- Move selector switch S103 on the control PCB to the up position for 120V.
- If equipped with a transformer, remove the two jumpers between H2 and H3 and connect one between H1 and H3 and the other between H2 and H4.
Full service-parts list: Cummins/Onan DFHA →, Cummins/Onan DFHB →, Cummins/Onan DFHC →, Cummins/Onan DFHD →
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.