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UMHPI

Industrial inverter air/water heat pumps with axial fans

8.3.3

IN JOINT OPERATION (AREA II)

If the outdoor air temperature is included between

r28

and

r08

, the compressor will operate in synergy with the auxiliary electric

heaters.
In this operation area, the devices will start operation in the following working order: at first the boiler will start the operation,
then the heat pump and the plant circuit auxiliary electric heaters will start operation after a period of time given by

r12

(in

minutes)

and after

r16

(in minutes) the DHW auxiliary electric heaters will start operation.

The activation priorities are defined by the following parameters

r14

r20

r23

and

r24

The operation becomes

normal

if the temperature increases above the value of

r28

+1,0°C.

Note:

In the joint operation, the temperature of the boiler is adjusted by the water temperature remote sensor of the plant circuit

(if enabled), particularly if the temperature measured by this remote sensor is less than the setpoint

Hea

, the boiler will be

activated, and then will be deactivated when the measured temperature by the remote sensor is greater than setpoint

Hea

The boiler will be managed by the outlet temp. sensor of the heat pump if the water plant circuit remote sensor is not active.

8.3.4

IN SUBSTITUTION OPERATION

If the outdoor air temperature decreases below

r08

the compressor operation will be inhibited.

If the auxiliary system is composed of the plant circuit and/or the DHW electric heaters, they will be activated in substitution
to the compressor with a duration defined by

r12

(minutes) for the plant circuit side and by

r16

(minutes) for the domestic

hot water side.
During the substitution operation, instead it is not necessary to enable the auxiliary electric heaters with the parameter

r10

r15

, because the auxiliary electric heaters operate in substitution (and not as auxiliary heating systems) to the heat pump

(therefore it is enough to select the type of utilization of the auxiliary electric heaters by setting only the parameter

r24

If the auxiliary system is a boiler with its proper circulator (

r32

The circulator of the heat pump will be off, the boiler will be enabled after

P01

(default 30 seconds).

Note:

When the defrosting protection occurs on the water side, the utilization pump will be activated (or remains on).

If the in substitution auxiliary system is a boiler with its proper temperature control (

r32

The boiler will be enabled independently than thermoregulation of the heat pump.

If the in substitution auxiliary system is a boiler without circulator (

r32

The circulator of the heat pump will be active when the boiler is enabled.

The compressor will be enabled again if the temperature increases above the value of

r08

r09

(°C) (by default r09=1,0°C)

8.3.5

OPERATION AREA - ACTIVATION OF THE AUXILIARY ELECTRIC HEATER AND BOILER (Plant circuit water

temperature sensor is not enabled)

The possible configurations of the parameters related to auxiliary heaters are listed below in the tables 1, 2, 3 and 4, that are
divided by areas of operation (the columns of "MODE" and "

rxx

" parameters indicate the operation mode and the possible values

of the parameters for allowing the auxiliary heaters to intervene according to a predefined order of intervention, when the unit is
running in a certain type of operation; several modes and values of the parameters can be alternatively selected and they are
reported in the same cell separated by the symbol "/").

TABLE 1. NORMAL OPERATION IN HEAT PUMP MODE

N°

ORDER OF INTERVENTION OF

AUXILIARY ELECTRIC HEATERS

(when

the setpoint is not achieved and the

unit is in alarm condition)

MODE

OPERATION

r10

r15

r12