Bard WH-301 ELECTRIC HEAT HOLD-OFFSee Figures 13 and, Figure Electric Heat Hold-Offwiring, Manual

ELECTRIC HEAT HOLD-OFF (See Figures 13 and 14)

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 setback 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 setback conditions.)

FIGURE 13

ELECTRIC HEAT HOLD-OFF WIRING 4 & 10KW 1 PH — 6 & 9KW 3 PH

FIGURE 14

ELECTRIC HEAT HOLD-OFF WIRING

15KW 1 PH & 3 PH

Manual	2100-193O
Page	18 of 26