Mitsubishi Electric PAC-IF021B-E Manual page 23

4
Switch setting (FTC2)
4.5 Operation setting
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).
Without Automatic change over mode (the system does NOT have a DHW tank).
ON
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
<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 *
Heating ECO Heating only with Weather compensation *
Hot Water Domestic Hot Water only *
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.
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
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).
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.
1
1
1
Flow temp. controller
SW 1-1 OFF / SW 1-2 OFF / SW 1-8 OFF
Flow
switch
IN1 IN2 IN3 IN4 IN5
Emergency Legionella Comp Cooling Heating Heating
prevention OFF
TH1
TH1
FTC2
TH2
TH2
TH5
TH5
OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7
Water Booster 3-port
circulation heater 2 valve
pump Booster
Immersion
heater 1 heater
SW 1-1 OFF / SW 1-2 OFF / SW 1-8 ON
External input
Flow
switch
IN1 IN2 IN3 IN4 IN5
Emergency Legionella Comp Cooling Heating Heating
prevention OFF
TH1
TH1
FTC2
TH2
TH2
TH5
TH5
OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7
Water Booster 3-port
circulation heater 2 valve
pump Booster
Immersion
heater 1 heater
IN6 IN7 IN8
Hot Anti
ECO Water freeze
PAR-W21MAA
Error
Defrost
Local timer
IN6 IN7 IN8
Hot Anti
ECO Water freeze
PAR-W21MAA
Error
Defrost
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