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Electric Preheat
Figure 32 - Preheat Controller
The electric preheat controller is factory
installed within the preheat cabinet. The
following details are for EHC1 version 1.10
of the preheat controller.
Status Display Screens
These screens are access by pressing either
the left or right controller buttons and
scrolling through the following displays.
1. LAT - Measured leaving air temperature
(LAT), average of LAT A and B probes.
MOD - Modulation rate % currently
being applied to stage one SCR.
2. WKGset - "Working" LAT setpoint (°F)
(LATeet>>RESETset as adjusted by 0-
10V RESET signal).
3. LATset - Leaving air temperature (°F)
control setpoint.
4. RESETset - "Reset" air temperature
(°F) control setpoint.
5. OATset - Outside air temperature (°F)
control setpoint, measured outside
temperature must be less to enable
preheat.
Screen
Controller
Buttons
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