Mitsubishi Electric Climaveneta i-BX-004-013M Installation, Operation And Service Manual page 52

CONTROL AND OPERATING CHARACTERISTIC
Water set point compensation diagram in COOLING
The compensation curve in cooling mode can be modified to
allow correct heat pump operation depending on the cooling
system used (radiant panels, fan coils).
Points T1 and T2 correspond to two outside temperature
values that respectively identify the maximum and minimum
system water temperature.
Water
set point
Tm1
Tm2
Te1
The compensation curves in COOLING are divided into:
• SYSTEM curve: determines the set point for heat pump
operation and any high temperature zones. The set point
calculated refers to the unit water temperature. The water
outlet temperature is usually 5°C lower than the return
temperature. This temperature difference may change
depending on the flow-rate and the type of system. Make
sure that the temperature difference is within the limits
required by the manufacturer.
• ZONE curve determines the water outlet temperature in
the mixed circuit.
For systems configured with mixed zones, the SYSTEM
curve and ZONE curve must be selected.
The system and zone curve work in cascading, the mixed
zone curve may therefore not request a lower value than the
one supplied by the system curve.
Maximum room humidity compensation
Function only active if the N-THC room control units (acces-
sory) are installed.
The water temperature set point, calculated based on the
compensation curve, can be compensated according to the
maximum relative humidity in the room.
The water temperature value can increase so as to avoid
possible formation of condensate in the radiant cooling sys-
tems (underfloor, ceiling, wall, etc.). If the relative humidity
measured by the A5 room unit A5 exceeds the value set for
parameter 0157, 0172, the water temperature set point
increases until reaching the maximum temperature.
The maximum water temperature is the set point calculated
according to the compensation curve in cooling mode plus
the value set for parameter 0158, 0173. Enabling room
humidity compensation on SYSTEM deviates the calculated
heat pump water temperature set point. Enabling room
humidity compensation on ZONE LT1 deviates the calculat-
ed water temperature set point to the system, controlled by
the mixing valve.
This function is only selectable if at least one low tempera-
ture zone with mixing valve is enabled.
Temperature
hysteresis (°C)
Value:
parameter 0158
parameter 0173
parameter 0188
Value parameter 0157
Value parameter 0172
Value parameter 0187
52 i-BX-(Y)_i-BX-N-(Y) EN
Te2 Outside temp.
100% UR% Room
humidity (RH%)
Description
Enable SYSTEM compensation curve
NOT
YES
Maximum temperature set point limit in cool-
ing mode (Tm1)
Minimum outside temperature corresponding
to max. temperature (Te1)
Minimum temperature set point limit
in cooling mode (Tm2)
Maximum outside temperature correspond-
ing to min. temperature (Te2)
Enable compensation curve zone LT1
NOT
YES
Maximum temperature set point limit in cool-
ing mode (Tm1)
Minimum outside temperature correspond-
ing to max. temperature (Te1)
Minimum temperature set point limit in cool-
ing mode (Tm2)
Maximum outside temperature correspond-
ing to min. temperature (Te2)
Description
Enable compensation for room
humidity, SYSTEM
NOT
YES
Room relative humidity value to start
increasing SYSTEM water tempera-
ture set point
Maximum temperature hysteresis
corresponding to 100% relative
humidity
Enable compensation for room
humidity, ZONE LT1
NOT
YES
Room relative humidity value to start
increasing water temperature set
point ZONE LT1
Maximum outlet temperature hys-
teresis corresponding to 100% rela-
tive humidity
A
Menu arameter Default
no.
Mn01 0154 NOT
Mn01 0128 25
Mn01 0129 23
Mn01 0130 23
Mn01 0131 36
Mn01 0169 NOT
Mn01 0132 20
Mn01 0133 23
Mn01 0134 18
Mn01 0135 36
Menu Parameter Default UOM
no.
Mn01 0156 NOT
Mn01 0157 70
Mn01 0158 15
Mn01 0171 NOT
Mn01 0172 70
Mn01 0173 15
OM
°C
°C
°C
°C
°C
°C
°C
°C
%
°C
%
°C