Bard WH381 - Electric Heat Hold-Off; Figure 11 Electric Heat Hold-Off Wiring; Figure 12 Electric Heat Hold-Off Wiring; Table 4 Wall Thermostat

Manual 2100-342 I
Page 16 of 24
TABLE 4
WALL THERMOSTAT
tatsomrehTserutaeFtnanimoderP
850-3048
)1511D0225HT(
taehegats2;loocegats2
elbammargorP-noNcinortcelE
revoegnahclaunaMrootuA
060-3048
)544-0211(
taeHegats3;looCegats3
cinortcelEelbammargorP-noN/elbammargorP
revoegnahclaunaMrootuA;lanoitnevnoCroPH
ELECTRIC HEAT HOLD-OFF
(See Figures 11 and 12)
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.)
FIGURE 12
ELECTRIC HEAT HOLD-OFF WIRING
15 – 20KW 1 PH AND 3 PH
FIGURE 11
ELECTRIC HEAT HOLD-OFF WIRING
4 – 10KW 1 PH – 6 & 9KW 3 PH