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Converting old Balboa TO 120v

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tfrasca:
I just got an old Caldera hot tub, with a Balboa WH-CAT75 heater assembly. Based on the sticker, it was made in 2000. It's currently set up for 240v, but I think I'd rather run it on 120v because my house's electric situation is slightly complicated.

Following the wiring diagram on the front panel of the unit, setting it up for 120v is just a matter of moving a jumper to the 20 amp setting, rather than 50 amps, and making a jumper wire between two spade connectors on the board. Easy enough. What's not clear is how I wire up the main power wire to the terminal block on the board. Right now, it uses awg 6 wire with 2 hots, a neutral, and a ground. All the 120v hot tub cords I've seen use 3 wires, of course. My question is how do I wire the 3-wire cord to the terminal block?

Has anyone dealt with this on an older hut tub heater before?

Thanks for any input.

CanadianSpaTech:
You will need to post photos of the circuit board and the schematic on the inside cover.

tfrasca:
Good point. Here's the board. You can see the main power terminal block on the left (4-wire 240v wiring removed), but it's hard to make out much beyond that without seeing it in person. The small jumper for 20/50 amps is in the upper right, and the jumper wire needed for the heater to operate on 120v would go between the J4 and J15 spade connectors. It looks like the previous owner had the heater running on 240v, but everything else was still on 120v.



Here's the schematic that goes with it:

cranbiz:
Black to black, white to white and ground to ground. Red terminal stays empty.

You can see that the white white goes to the J5 etc. set of terminals (110v) and the red terminal goes to the J18 etc terminals (220v)

Looks like you have the rest of the wires set up correctly.

tfrasca:
That was my inclination, but the jumper from the white set of terminals to the red set for the heater threw me off. But I guess the circuit for the heater uses the red set, and the jumper wire pulls power from the white set in the absence of the red wire.

Thanks!

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