Manual 2100-737A
Page
14 of 25
ELECTRIC HEAT HOLD-OFF
(See Figures 10 & 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
.)
MIS-1858
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
