Runs two 2-speed pumps plus blower
3KW
Ref 54515

Replacement pack for Mr Spa systems

 Compatible Canadian Spa Topside Controls

VL404 3 button 

VL404 2 button 

VL701

Manufacturers Part Number

 Balboa Water Group - 54515

Model 501SZ tech sheet

Mode is changed by pressing   Warm or Cool, then pressing Mode

STANDARD Mode maintains set temperature. 
will be displayed momentarily when you switch into Standard Mode.

ECONOMY Mode heats the spa to the set temperature 
only during filter cycles.  will display when water temp is not current, and will alternate with water temp when the pump is running.

SLEEP Mode heats the spa to within 10°C/20°F of the set temperature only during filter cycles.  will display when water temp is not current, and will alternate with 
water temp when the pump is running

Does not suppotrt VL200 or VL260 topsides