Flow temp. controller
C-23
Switch setting (FTC2)
Flow temp. controller
4
C-23
4.5.1. Automatic change over mode
When a system includes a Domestic Hot Water (DHW) tank and a space heating requirement Automatic change over mode should be selected.
Selection is made with Dip SW1-8.
If the system does NOT include a DHW tank Dip SW 1-3 is ON and Automatic change over mode is invalid.
SW 1-8 Operation
OFF With Automatic change over mode (the system has a DHW tank).
ON
Without
Automatic change over mode (the system does NOT have a DHW tank).
OR
The end user would like to control the switch over between DHW and space heating.
Operations on each mode with Automatic change over mode.
<SW1-1 OFF / SW1-2 OFF>
Mode System operation
Heating Heating and DHW (Automatic change over mode)
Heating ECO Heating with Weather compensation and DHW (Automatic change over mode)
Hot Water Domestic Hot Water only
Anti-freeze Prevents pipe work freezing during periods of inactivity
Operations on each mode without Automatic change over mode.
Mode System operation
Heating Heating only
Heating ECO Heating only with Weather compensation
Hot Water Domestic Hot Water only
Anti-freeze Prevents pipe work freezing during periods of inactivity
<SW1-1 ON / SW1-2 OFF or SW1-1 OFF / SW1-2 ON or SW1-1 ON / SW1-2 ON>
Mode System operation
Heating Heating only *
1
Heating ECO Heating only with Weather compensation *
1
Hot Water Domestic Hot Water only *
1
Anti-freeze Prevents pipe work freezing during periods of inactivity
*1 Automatic change over mode is available only when SW1-1/1-2 is set ON/OFF and the FTC2 receives
external signals for Heating (or Heating ECO) and DHW at the same time from the local controller.
Automatic change over mode is NOT available when SW1-1/1-2 are set OFF/ON or ON/ON.
System examples
Example 1:
Only our Remote controller (PAR-W21MAA) is used for system control.
NO local system controller exists.
Target temperature for each mode and Heating or Heating ECO mode are set
with PAR-W21MAA. Automatic change over mode is selected (SW 1-8 must
be switched to OFF). The system will automatically change from Heating or
Heating ECO to DHW mode and back dependent on the DHW tank tem-
perature (TH5).
SW 1-1 OFF / SW 1-2 OFF / SW 1-8 OFF
Example 2:
A local timer and our Remote controller (PAR-W21MAA) are used
for system control.
Target temperature for each mode and Heating or Heating ECO mode are set
with PAR-W21MAA.
A local timer is used rather than automatic change over mode (SW1-8 must
be switched to ON). The system runs in Heating or Heating ECO until a signal
is received from the local timer (the signal received from local timer must
be longer than 200 ms). The system then switches to DHW mode.
Once DHW mode is satisfied the system automatically reverts to Heating or
Heating ECO.
SW 1-1 OFF / SW 1-2 OFF / SW 1-8 ON
PAR-W21MAA
FTC2
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
Local timer
Comp
OFF
Legionella
prevention
Emergency
PAR-W21MAA
FTC2
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
Comp
OFF
Legionella
prevention
Emergency
Error
Error
4.5 Operation setting
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