Demand Limit; Tray Heater; Current Operation Mode Notification - Mitsubishi Electric i-BX-N Technical Manual

Table of Contents

TM_i-BX(-N)_NC05_00_06_20_EN

4.16

DEMAND LIMIT

This function can be activated using the DI8 digital input when parameter 019C = DEMAND LIMIT. Its purpose is to inhibit the operation of the heat

pump and the delivery heaters (if present), due to them being electric loads. This is to avoid electric line overload, for example if the switching on of

other loads with higher priority than the heat pump is required.

Only the boiler stays on, if present, to meet the needs of the system, and the DHW heater in case of DHW request.

With the contact active, only the antifreeze protections will be active, and therefore the heaters and pumps of the corresponding exchangers.

If the contact is activated during defrost, the heat pump will only be stopped when defrost has been completed.

In case of activation of the demand limit, if there is a DHW request the corresponding immersion heater switches on, if configured.

When the demand limit stops, if TDHW<0022 or 0023, the heater switches off; if 0022 or 0023<TDHW>0209, the heater stays on until "set overboost"

(0209) is reached.

For the default values of the various parameters, see the parameters table

4.17

TRAY HEATER

This function can be enabled using the parameter and is used to activate the heater in the defrost water collection tray, to avoid that the same freezes

due to the low external air temperature. The heater is activated based on the function described below:

For the default values of the various parameters, see the parameters table

4.18