MTA NGSi 05, Technical Manual, Page: 31 / 58

TECHNICAL MANUAL
Chapter 9
- User - Control Interface
NGSi 05÷15
29
ENGLISH
EN
The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited
Table 5 shows the settings required to enable the backup units in “Summer and domestic hot water” mode (in this case, the only backup that
can be activated is the domestic hot water backup heater and the division into operating ranges does not apply).
Table 6 shows the behaviour of the system and domestic hot water backup heaters in all operation cases of the machine.
It can finally be established that the hot water tank and/or backup heaters (depending on the resources and the priorities selected) have a
setpoint in “heat” mode or in “domestic hot water” mode greater than that of the heat pump. This is achieved by setting an offset on the
setpoints:
• r29 : Temperature offset for hot water tank and system heaters first setpoint ( G02 );
• r30 : Temperature offset for hot water tank and system heaters first setpoint ( G05 );
• r31 : Temperature offset for hot water tank and domestic hot water heaters ( G03 ).
Table 5
OPERATION IN COOL + DOMESTIC HOT WATER MODE (DOMESTIC HOT WATER IN OPERATION)
No.
BACKUP
OPERATIONS ORDER
- A setpoint not met after
r16 minutes after the
compressor start or
- a setpoint not met with
machine in cutout alarm
STATUS OPERATION r10 r15 r12 r16 r23 r24
1
1) Domestic hot water
backup heater
COOL+
DOMESTIC
HOT WATER
domestic hot
water
0/1 1 / set the
minutes
0/1/2/
3/4/5/6
2/3
Table 6
BACKUP HEATERS OPERATION
No. STATUS OPERATION SYSTEM BACKUP HEATER
DOMESTIC HOT WATER
BACKUP HEATER
1 HEAT+DOMESTIC HOT
WATER heat It works as shown in Tables
1,2,3 and 4. In “HEAT + DOMESTIC HOT
WATER” mode the domestic
hot water temperature control
by default has precedence over
the system, so if the
temperature control requires it,
the machine goes into
“DOMESTIC HOT WATER”
operation and the domestic hot
water backup heater works as
shown in Tables 1, 2, 3 and 4.
2 HEAT+DOMESTIC HOT
WATER domestic hot water Only if all of the following 3
conditions occurred:
- configured the output for
System backup Heater;
- r24=1/3;
- water temperature remote
probe of the current system
and configured
(see Point 9.11).
The system backup heater start
operating in the following
situations:
- after
r12 minutes after the
counting starts in “HEAT”
mode which was previously in
operation (see line No. 1);
- if the counting in the
“HEAT” operation mode
mentioned above has not
already been activated, after
r12 minutes from the request
of temperature control.
In DOMESTIC HOT WATER
mode, with remote probe not
configured, the system backup
heater is disabled or its counts
are interrupted.
With “remote on-off” contact
open the System backup heater
is disabled.
It works as shown in Tables
1,2,3 and 4.
3
COOL+ DOMESTIC HOT
WATER domestic hot water It can not be activated. It operates as shown in table 5.
4
COOL+ DOMESTIC HOT
WATER cool It can not be activated. It can not be activated.