Flow temp. controller
C-24
Switch setting (FTC2)
Flow temp. controller
4
C-24
System examples
Example 3:
A Local controller and our Remote controller (PAR-W21MAA) are used
for system control.
Target temperatures for each mode are set with PAR-W21MAA.
A local controller is used to select the running mode rather than Automatic
change over mode (SW 1-8 is switched to ON).
Automatic change over mode is available when SW1-8 is OFF and the FTC2
receives external signals for Heating (or Heating ECO) and DHW at the same
time from the local controller.
<IMPORTANT NOTE>
In this system, the operation mode must be switched by a local controller
which can output separate signals for each operation mode.
(This can be realised by using a schedule timer and relays.)
SW 1-1 ON / SW 1-2 OFF / SW 1-8 ON
or SW 1-1 ON / SW 1-2 OFF / SW 1-8 OFF
Example 4:
ONLY a Local controller is used for system control.
The system operates in the same way as Example 3 except that the target
temperatures for each mode must also be inputted via the analogue signal
from the local controller. (SW1-8 must be switched to ON)
<IMPORTANT NOTE>
In this system, the operation mode must be switched by a local controller
which can output separate signals for each operation mode. In addition,
the target temperature in each operation mode must be sent by ANALOG
signal from the local controller.
SW 1-1 OFF / SW 1-2 ON / SW 1-8 ON
or SW 1-1 ON / SW 1-2 ON / SW 1-8 ON
FTC2
Local system controller
IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8
OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7
TH1
TH2
TH5
TH5
TH2
TH1
Flow
switch
Water
circulation
pump
Booster
heater 1
Booster
heater 2
Immersion
heater
3-port
valve
Defrost
Heating Hot
Water
Heating
ECO
Anti
freeze
Cooling
External input
Analog input
Comp
OFF
Legionella
prevention
Emergency
Error
PAR-W21MAA
FTC2
Local system controller
IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8
OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7
TH1
TH2
TH5
TH5
TH2
TH1
Flow
switch
Water
circulation
pump
Booster
heater 1
Booster
heater 2
Immersion
heater
3-port
valve
Defrost
Heating Hot
Water
Heating
ECO
Anti
freeze
Cooling
External input
Comp
OFF
Legionella
prevention
Emergency
Error
Error
Error
4.5.2. DHW OFF conditions
DHW can be selected in 2 ways
Pattern 1.
An external input or remote controller is used to switch to DHW mode.
DHW pattern 1 will turn off when the DHW tank reaches set temperature consecutively for 1 minute.
Then the heat pump will turn OFF
Pattern 2.
Automatic change over mode or an external input (e.g. Local timer – signal received must last > 5secs) is used to switch to DHW mode.
DHW pattern 2 will switch off under the following conditions;
a) The DHW tank reaches set temperature T
HW consecutively for 1 minute.
b) The system has been in DHW mode consecutively for H
time (minutes)
(This allows the system to switch back to Heating or Heating ECO mode should the system fail to reach the set temperature for any
reason)
System operation status at start-up H
time (minutes)
First power-on
First starting up after Initial filling up
TH5 < 25 deg C (Tank temperature is low.)
300
Others
180
* As shown in the table, H
time
becomes longer when the water temperature in the tank is low. This is to delay the operation switchover to
Heating mode.
Then the heat pump will revert to Heating or Heating ECO mode.
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