System Primary Circuit Antifreeze; System Secondary Circuit Antifreeze - Mitsubishi Electric i-BX-N Technical Manual

TM_i-BX(-N)_NC05_00_06_20_EN
4.13.2

SYSTEM PRIMARY CIRCUIT ANTIFREEZE

Protection is related to the value read by probe B4 (external air temperature (Machine))
The interested resource is the system primary pump (Machine) - NO5 -
This function can be enabled by setting parameter 0149 = YES and has the purpose of protecting the piping from the unit to the system primary circuit
from ice. It does so by activating the system primary circuit pump when the temperature of the air read by the machine air probe (B4) falls to a certain
value that can be set using parameter 0141, based on the following function.
This function is only active when the unit is OFF.
The sniffer parameters are 0150 "Time on sniffer antifreeze" and 0151 "Time off sniffer antifreeze"; for the sniffer function details refer to the "Pump
in sniffer mode" section
If during the sniffer activity the detected water temperature is such to enable the antifreeze function described in the "Exchanger antifreeze"
paragraph, this function will take priority.
For the default values of the various parameters, see the parameters table
4.13.3

SYSTEM SECONDARY CIRCUIT ANTIFREEZE

Protection is related to the value read by probe B4 (external air temperature (Machine))
The involved resources are pumps HT1 (high temperature zone) and LT1 (low temperature zone)
If enabled, the pumps of the secondary will activate together with those of the primary system circuit, following the criteria described in in the "
For the default values of the various parameters, see the parameters table.
MEHITS S.p.A. ● TECHNICAL MANUAL
Water/machine
pump
Pump off hysteresis ( 0142)
ON
OFF
Pump enable setpoint
(0141)
Air T (B4) [°C]
49
Version NC05 - Translation of the Original Instructions