Manual
2100-487
Page
15 of 23
FIGURE 10
ELECTRIC HEAT HOLD-OFF WIRING
4 – 10KW 1 PH — 6 & 9KW 3 PH
FIGURE 11
ELECTRIC HEAT HOLD-OFF WIRING
15 – 20KW 1 PH & 3 PH
TABLE 4
WALL THERMOSTAT
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ELECTRIC HEAT HOLD-OFF
(SEE FIGURES 10 AND 11)
In other applications, it is desirable to disable the operation
of the electric heat until outdoor temperatures have reached
a certain design point. This won't allow the electric heat to
come on as second stage heating unless the outdoor
temperature is below the set point of the outdoor thermostat.
This is done to maximize efficiency by utilizing the heat
pump to bring the conditioned space temperature up, rather
than cycling on the electric heat due a second stage call for
heat from the thermostat on start-up coming off a night set-
back condition or someone increasing the thermostat set
point. (NOTE: Some programmable thermostats do have a
built-in time delay for pulling in second stage heat when
coming off set-back conditions.)
