Trane Picco R3206A Manual page 19

I/O resource - Parameter
ID9 can be activted via H53
The poles of the digital input can be swapped by setting H76=1
The SAN setpoint of the heat pump is not considered, the designer is in charge of managing this setpoint, taking into account domestic hot
water protection and configuration of the entire system.
10.4 SYSTEM WATER REMOTE PROBE
In some engineering solutions (e.g. heat pump in parallel to boiler on same hydronic circuit and shut off diverter valve) it could be necessary to
enable a system temperature probe so that the controller can correctly process the management.
I/O resource- Parameter
ST7 can be activated via H18
The plant remote probe controls the temperature of the heat pump only during the compressor start-up phase. Shutdown is managed by the
probe on the heat pump delivery line.
The table below illustrating operation of the system helps to understand this concept:
Operating mode
heating
cooling
Nota: b22=5°C. See paragraph 13.
10.5 AUXILIARY HEATERS
In certain engineering solutions, it could be necessary to use an additional heater for the plant or for domestic hot water.
Parameter r24 must be set to define the operating mode of the additional heaters:
- r24=0 integration heaters not used;
- r24=1 only plant integration heater used;
- r24=2 only DHW integration heater used;
- r24=3 both plant and DHW integration heaters used.
10.5.1 PLANT HEATER
If the regulation temperature remains below water setpoint in heating (Hea) – 0.5°C for a time equal to r12 the integration heater is activated
according to operation of the machine in joint time slots or in substitution, as indicated in Paragraph 10.11.
The heater switches off when the setpoint is reached (also taking into account an offset set with parameters r29 or r30).
If the regulation temperature remains below the water setpoint minus r11 (°C) and the machine is blocked due to triggering of an alarm, the
heater switches on. It switches off when the machine exits the alarm block.
I/O resource - Parametro
r10
r11
r12
r24
D03 can be activated via H81
10.5.2 PLANT HEATER IN DEFROST
During the defrost cycle (see Paragraph 10.12.2), setting r21=1 (in addition to r10=1 and r24=1 or 3) activates the plant side electric heater, if
requested (regulation temperature lower than water setpoint -r11(°C), without waiting the time defined by r12.
10.5.3 DHW HEATER
Function which can be activated instead of managing the plant heater
This is an additional resource for heating the domestic hot water storage tank if the compressor alone is not capable of fulfilling the request in
a reasonable time.
If domestic hot water production lasts longer than r16 (minutes) or if the machine blocks due to triggering of an alarm, the heater switches on.
It switches off when the unit finishes domestic hot water production (also taking into account an offset on the setpoint with parameter r31, as
explained in Paragraph 10.11.1).
Value
28
Value
41
Heat pump call active
Temperature detected by the heat pump delivery probe < Hea setpoint - 0.5°C
Temperature detected by system remote probe < Hea water setpoint - b22
Temperature detected by the heat pump delivery probe > Coo setpoint+ 0.5°C
Temperature detected by system remote probe > Coo setpoint + b22
Value
1
0.5°C (default)
10 minutes (default)
1/3
22
Picco R32
Heat pumps inverter air/water with axial fans
Function
Closed contact -> active DHW call.
Open contact -> inactive DHW call.
Description
Enables plant remote probe
and
and
Function enabling
Heaters in heating integration delta
Heaters in heating integration delta
Type of use of heaters
Plant integration heater
Function
19