MAXA i-32V5C MIDI 0121, Manual

Page: 20 / 36

Controllo per i-32V5 MIDI
Air/water inverter chillers and heat pumps with axial fans
20
INTEGRATION LOGIC
r22
Heat pump + Boiler/Heater
JOINT OPERATION I ZONE
Heat pump/Heater
JOINT OPERATION II ZONE
Boiler/Heater
OPERATION IN SUBSTITUTION
Heat pump
STANDARD WORKING
r28
r08
Outside
temp.
If it is necessary to change the values of the parameters, the formula r22 ≥ r28 ≥ r08 must be followed.
Setting r22 = r28 it is possible to eliminate the zone relative to joint operation 1st band; by setting r28 = r08 it is possible to eliminate the zone
relative to joint operation 2nd band; by setting r22 = r28 = r08 it is possible to eliminate both bands relative to joint operation.
The intervention priorities of the auxiliary heaters are defined by parameters r14 , r20 , r23 , r24 (as described above).
CAUTION:Parameter r08 must not be set to a value lower than -20°C, as this could impair the operation of the unit.
18.8 OPERATION HEAT PUMP MODE
Normal operation of the heat pump in which the integration heaters and-or the boiler only intervene when a heat pump alarm is triggered.
18.9 JOINT OPERATION (I BRACKET)
If the outdoor temperature is between
r22
and
r28
, the compressor operates in synergy with the auxiliary heaters in winter or DHW mode. In
this operating bracket, first the heat pump is activated and after r12 minutes the plant side auxiliary heaters, or after r16 minutes the sanitary
side auxiliary heaters.
Operation returns to normal if the outside temperature is greater than r22 + 1,0 °C.
Note:
In the joint operation band, the boiler is thermoregulated by the system water remote probe (if active), in particular if the temperature
detected by the remote probe is lower than the Hea setpoint,the boiler is activated, and then deactivated when the temperature detected by
the remote probe is higher than
Hea
setpoint. The heat pump is also thermoregulated by the system water remote probe (as described above).
If the remote system water probe is not active, the boiler is controlled by the flow probe of the heat pump.
18.10 JOINT OPERATION (II BRACKET)
If the outside temperature is between r28 and r08 , the auxiliary heaters are enabled in combination with the heat pump in heating or DHW
mode. In this operating range, the boiler is activated first, then the heat pump and auxiliary heaters are activated after a time defined by r12
minutes for the system side or after r16 minutes for the DHW sanitary.
Operation returns to normal if the temperature rises above r28 + 1,0 °C.
Note: In the joint operation band, the boiler is thermoregulated by the remote system water probe (if active), in particular if the temperature
detected by the remote probe is lower than the Hea setpoint,the boiler is activated, and then deactivated when the temperature detected by
the remote probe is higher than Hea setpoint. The heat pump is also thermoregulated by the system water remote probe (as described above).
If the remote system water probe is not active, the boiler is controlled by the flow probe of the heat pump.
18.11 OPERATION IN SUBSTITUTION
If the outside temperature falls below r08 the heat pump compressor is disabled and the auxiliary devices operate in place of it. The compressor
is enabled again if the temperature rises above
r08 + r09
(default r09 = 1.0 °C).
If the auxiliary system consists of system and/or DHW resistors, they operate according to the times defined by parameters r12 (minutes) for the
system side and
r16
(minutes) for the DHW side. In the substitution operation band, it is not necessary to enable the integrations with
r10
or
r15
since the resistances must operate as a replacement for the heat pump (it is therefore sufficient to select the type of use from parameter r24 ).
If the auxiliary system is a boiler with autonomous thermoregulation (
r32
=
2
or
3
),it is enabled independently of the thermoregulation of the
heat pump.
If the replacement auxiliary system is a boiler without a circulator (
r32
=
0
or
2
), the heat pump circulator is active when the boiler is enabled.
If the auxiliary system is a boiler with its own circulator ( r32 = 1 or 3 ), the heat pump circulator is switched off and after P01 (default 30 seconds)
the boiler is enabled.