Heat Pump Inhibitions; Operation Outside Envelope; External Air Temperature - Mitsubishi Electric i-BX-N Technical Manual

TM_i-BX(-N)_NC05_00_06_20_EN
4.15

HEAT PUMP INHIBITIONS

The following inhibitions are set for the protection of the heat pump:
-

operation outside envelope

- based on the external air temperature
The individual functions are described below.
4.15.1 OPERATION OUTSIDE ENVELOPE
See the paragraph dedicated to the Power+ driver.
4.15.2

EXTERNAL AIR TEMPERATURE

The purpose of this function is to protect the machine, preventing the operation of the compressor in heating or cooling mode when the external air
temperature exceeds the rated operating limits of the unit, set through the parameter, based on the functions described below:
Any heating request is met with the available resources (delivery heaters, alternative heat source).
Limits in HEAT only operating mode: 133Z and 0515 and related hysteresis
Limits in DHW only operating mode: 133Z and 0515 and related hysteresis
Limits in COLD only operating mode: 133Q and 0526 and related hysteresis
Limits in DHW + COLD operating mode: 133Z and 0515 during DHW operation and 133Q and 0526 during COLD operation.
Limits in DHW + HOT operating mode: 133Z and 0515 both during DHW and HOT operation.
For the default values of the various parameters, see the parameters table.
MEHITS S.p.A. ● TECHNICAL MANUAL
Low external temperature inhibition
Unit block
External low T unit stop
hysteresis (0312)
Attivo
OFF
External low T unit stop
setpoint
(133Z)
High external temperature inhibition
Unit block
External high T unit stop
hysteresis (0516)
Attivo
OFF
External air T (B4) [°C]
External air T (B4) [°C]
External high T unit
stop setpoint
(0515)
53
Version NC05 - Translation of the Original Instructions