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15
Power Configurations for 780 Certa, Chelsee, and Hamilton Models
(North America, 60Hz)
This section describes the power configuration choices (Standard 50 Amp, Alternate 40
Amp, and Alternate 60 AMP) for Certa, Chelsee and Hamilton hot tub models.
Cong. #1
Standard 50A Configuration
(factory setting)
240 VAC/50A 3-wire configuration (2 •
hots and a ground)
50A dual-pole GFCI breaker (hard •
wired only)
Electrical current draw of 36A •
If the home’s electrical system does not have
240 VAC/60A, the spa may be connected to
a 240V/50A power source after a qualified
electrician makes a minor circuit board
modification.
In this Standard 50A configuration, the heater
yields the same rapid temperature rise as in 60A
operation, but does not operate while both jets
pumps are running in high-speed. Note: Pump 2
runs only in high-speed.
Config. #2
Alternate 40A Configuration
(For homes where 240 VAC/50A or
240 VAC/60A power is unavailable).
240 VAC/40A 3-wire configuration (2 •
hots and a ground)
40A dual-pole GFCI breaker (hard •
wired only)
Electrical current draw of 26A•
If the home’s electrical system does not
have the full 240 VAC/50A or 240 VAC/60A
power available, the spa may be connected
to a 240V/40A power source after a qualified
electrician makes a minor circuit board
modification.
In this configuration, the heater does not run
while either of the jets pumps are running in
high-speed. Note: Pump 2 runs only in high-
speed.
Config. #3
Alternate 60A Configuration
(Optional setting for maximum heater
performance).
240 VAC/60A 3-wire configuration (2 •
hots and a ground)
60A dual-pole GFCI breaker (hard •
wired only)
Electrical current draw of 45A•
If the home’s electrical system has the full
240V/60A power available, the spa may be
connected to a 240V/60A power source after a
qualified electrician makes a minor circuit board
modification.
In this configuration, the heater operates while
both jets pumps are running. This may be
preferable for owners of outdoor spas in cold
climates because it will help their spas maintain
water temperature during use.
Note
Wire size must meet NEC recommendations and is determined by
maximum current draw and length or run.
Important:
All of the alternative electrical congurations require
a qualied technician to perform minor circuit board modications. To avoid
damage to the spa, do not activate power to the spa until these modications
have been made. We recommend Square-D or Cutler Hammer circuit
breakers.