Frost Protection - Mitsubishi Electric Climaveneta i-BX-004-013M Installation, Operation And Service Manual

CONTROL AND OPERATING CHARACTERISTICS
Heat pump operation with
fixed set point
System water set point compen-
sation using the compensation
curves can be disabled.
To enable fixed set point opera-
tion, set parameter 0152=0 and
0154=0
The heat pump will operate
based on the fixed set point
defined by parameters 0153
(Heating) and 0155 (cooling).

FROST PROTECTION

Frost protection based on system water temperature
The frost protection function is active even if the controller is
in standby. To prevent the water freezing and damaging the
plate heat exchanger, the microprocessor shuts down the
compressor and activates the system heat exchanger
heater if the temperature measured by the heat exchanger
outlet temperature probe is than +4°C. The frost prevention
temperature set point can only be modified by an authorised
service centre, and only after verifying that the water circuit
contains antifreeze. Tripping of this alarm shuts down the
compressor but not the pump, which remains active. To
reset normal operation, the water outlet temperature must
rise to more than: +7°C on the system side. Reset is auto-
matic.
Frost protection based on inside temperature
Function only active if the N-THC room control units (acces-
sory) are installed.
Frost protection on the heating circuit is always active, even
when the heat pump is off (but connected to the power supply).
The heat pump and/or supplementary sources of heat (out-
let heater or boiler) are activated if the room temperature
falls below the value set for parameter 0140, to prevent the
pipes inside the home from freezing.
Description
Inside temperature to enable frost
protection
Frost protection based on outside air temperature
Frost protection on the primary and secondary heating cir-
cuits based on outside air temperature is always active,
even when the heat pump is off.
The system unit pump and secondary circuit pump (if fea-
tured) are activated when the outside air temperature falls
below the value set for parameter 0141.
Description
Outside temperature to enable
frost protection
54 i-BX-(Y)_i-BX-N-(Y) EN
Description
Enable set point in HEATING, SYSTEM
NOT
YES
Fixed water temperature set point in HEATING, SYSTEM
Enable set point in HEATING, ZONE LT1
NOT
YES
Fixed water temperature set point in HEATING, ZONE LT1
Enable set point in COOLING, SYSTEM
NOT
YES
Minimum water temperature limit, COOLING, SYSTEM
Fixed water temperature set point in COOLING, SYSTEM
Enable set point in COOLING, ZONE LT1
NOT
YES
Fixed water temperature set point in COOLING, ZONE LT1
Menu Parameter Default UOM
no.
Mn01 0140 5°C
Menu Parameter Default UOM
no.
Mn01 0141 4
Description
Antifreeze electric heater Setpoint
of the heat exchanger
System antifreeze alarm set point
Heat pump
ON
OFF
°C
Primary and secondary
water circuit pump
ON
°C
OFF
U I A
Menu Parameter Default
no.
Mn01 0152 NOT
Mn01 0153 45
Mn01 0167 NOT
Mn01 0168 38
Mn01 0154 NOT
Mn01 015M 7
Mn01 0155 7
Mn01 0169 NOT
Mn01 0170 19
Menu Parameter Default
no.
Mn06 0621 4
Mn06 0634 4
1°C
0140 Inside temperature
1°C
Outside air T
0141 Outside air temperature to enable frost protection
UOM
-
°C
-
°C
-
°C
°C
-
°C
UOM
°C
°C
Room air temp.