Manual

2
Balboa’s Patented M7 Technology
TOPSIDE CONTROL PANEL
The control panel activates functions at the touch of a button.
Each function will echo from the circuit board to the LCD in
a corresponding manner. The panel will also display diag-
nostic messages that enable the service technician to easily
troubleshoot the system.
M7 TECHNOLOGY
M7 is a patented Balboa technology that uses two sensors
inserted at the opposite ends of the heater element to
determine flow, dry fire conditions, etc. The two sensors
located within the heater housing compare the inlet water
temperature with the outlet water temperature. It works no
matter which direction the water flows through the heater.
The sensors in combination with specific software allow the
spa to be controlled without the use of external pressure
switches, flow switches, or temperature sensors.
ML700 Top Side Panel
Panel Construction
VS501 with a Cut-a-way
View of the Heater
Sensor
Sensor