Bard T24H1 Installation Instructions Manual

Also see for T24H1: Installation instructions

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Bard T24H1 Installation Instructions Manual Manual pdf 15 page image

Manual 2100-541CPage 15 of 28ELECTRIC HEAT HOLD-OFF(See Figures 10 & 11)In other applications, it is desirable to disable theoperation of the electric heat until outdoor temperatureshave reached a certain design point. This won't allowthe electric heat to come on as second stage heatingunless the outdoor temperature is below the set point ofthe outdoor thermostat. This is done to maximizeFIGURE 11ELECTRIC HEAT HOLD-OFF WIRING15 – 20KW 1 PH & 3 PHFIGURE 10ELECTRIC HEAT HOLD-OFF WIRING4 – 10KW 1 PH — 6 & 9KW 3 PHefficiency by utilizing the heat pump to bring theconditioned space temperature up, rather than cycling onthe electric heat due a second stage call for heat fromthe thermostat on start-up coming off a night set-backcondition or someone increasing the thermostat setpoint. (NOTE: Some programmable thermostats dohave a built-in time delay for pulling in second stageheat when coming off set-back conditions.)