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Electric Preheat
Figure 54 - 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.
6. LLTset - “Low Limit Time” temperature
(°F) setpoint. If this temperature is not
reached at full output, relay will pull in.
7. Stage - Current operating stage 1-6.
8. Stage - Current operating stage 1-6.
MOD - Modulation rate % being applied
to stage one heat strip SCR.
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