![background image](http://html1.mh-extra.com/html/harvest-tec/720-dew-simulator/720-dew-simulator_owners-manual_2103728019.webp)
19
Arm Switch
The Arm Switch is located towards the front of the machine on the right side of the lift arm (shown below). This
is a mechanical switch that senses when the reel lift arm is in the field operating position. The arm switch is
active when it senses the lift arm. The arm switch must be active for the 2way valve to close, thus directing
flow out to the heaters. When the arm switch is deactivated (normally open), flow from the pump is recirculated
back to the tank.
For instance, if you are treating a windrow and raise the reel 12” off the ground, either when turning at the
headland or stopping in the windrow, the arm switch becoming deactivated will cause the 2way valve to open
and divert flow to the tank, shutting off flow to the reel. Similarly, for the heaters to run, the arm switch must be
active, so when the reel is raised the heaters will automatically turn off. Additionally, the system must also be
seeing a flow rate (GPM) from the flow meter before the heaters will run.
**For system priming and diagnostics, the arm switch can be overridden by the “ARM OVERRIDE” button on
the controller. Activating that button will cause the 2way valve to close and allow flow to go through the heaters
regardless of the lift arm position.
Flow Switch
The flow switch is a safety sensor located at the inlet to Heater #1 that detects flow going through the heaters.
When flow is detected, the internal circuit closes and allows the burner motors to run. When flow is absent and
the internal circuit is opened, all flow of electrical power to the burner motors is stopped.
Summary of Contents for 720 Dew Simulator
Page 2: ...2 intentionally blank...
Page 7: ...7 Safety Decal Locations...
Page 69: ...69 Notes...
Page 70: ...70 Notes...