1
Screw positions
6
Place the terminal
blocks so that the
orientations of the
labels are correct.
BH79T377H02
2. Setting the Main Controller
<Main screen icons>
When boiler is running, icon 1 is displayed.
<Service menu>
(1) Heat source setting
Select heat sources to run.
[Standard] *1
• Heat pump and Electric heater
[Heater] *1
• Electric heater only
[Boiler]
• Boiler only (for emergency operation)
Note: DHW mode is NOT available in this setting.
[Hybrid]*1
• Standard (Heat pump and Electric heater) and Boiler
• Switch between heat sources dependent on energy saving calculation (running cost/CO
2
emission) or outdoor ambient tempera
-
ture. *2
*1 FTC4 can switch heat source to Boiler by external signal when Boiler is selected in “External input settings”.
*2 Make detailed settings in "Boiler settings" of "Operation settings ".
(2) Operation settings → Boiler settings
• Select prioritised items in energy saving calculation.
[Hybrid settings]
(a) Outdoor ambient temperature
Set the ambient temperature to switch to Boiler operation.
(b) Priority mode
Ambient: Heat source is switched based on outdoor ambient temperature.
Cost:
Heat source is switched based on running cost or outdoor ambient temperature.
CO
2:
Heat source is switched based on CO
2
emission or outdoor ambient temperature.
[Intelligent settings]
Set parameters for energy saving calculation.
The following settings will be applied when "Cost" or "CO
2
" is selected in Priority mode.
(c) Energy price
Enter unit prices of electricity, and gas or oil (depending on boiler type) per 1 kWh.
(d) CO
2
emission
Enter CO
2
emission amount from electricity or boiler (gas or oil).
(e) Heat source
Enter outdoor unit capacity, electric heater capacity, and boiler efficiency.
(3) External input settings
• Select which heat source to run when IN4 or IN5 external input signal is received.
• If Boiler is selected, boiler will start running by receiving external input signals.
External input settings
Demand control (IN4)
Boiler
Heat source OFF
Outdoor thermostat (IN5)
Boiler
Heater
3. Error codes
Code Error
Action
LC
Boiler circulation water temperature
overheat protection
Check if the setting temperature of the Boiler for heating exceeds the restriction.
Flow rate of the heating circuit from the boiler may be reduced. Check for
water leakage
strainer blockage
water circulation pump function
•
•
•
LD
Boiler temperature thermistor
(THWB1, THWB2) failure
Re-attach any thermistors that have become dislodged. Check resistance across the
thermistor.
LE
Boiler operation error
Re-attach any thermistors that have become dislodged. Check the status of the boiler.
LH
Boiler circulation water freeze
protection
Flow rate of the heating circuit from the boiler may be reduced. Check for
water leakage
strainer blockage
water circulation pump function
•
•
•
LL
Setting errors of Dip switches on
FTC4 control board
For boiler operation, check that Dip SW1-1 is set to ON (With Boiler) and Dip SW2-6
is set to ON (With Mixing Tank).
For 2-zone temperature control, check Dip SW2-7 is set to ON (2-zone) and Dip
SW2-6 is set to ON (With Mixing Tank).
1.3 Wiring for boiler control
Connect OUT10 to boiler external input (room thermostat).
1.4 Dip switch functions
Set Dip SW1-1 and SW2-6 to ON .
Dip switch
Function
OFF
ON
SW1-1
Boiler
WITHOUT Boiler
WITH Boiler
SW2-5
Automatic switch to backup heater only operation Inactive
Active
SW2-6
Mixing tank
WITHOUT Mixing tank
WITH Mixing tank
<Signal inputs>
When connecting room thermostat (field supply), wire the cable to IN1.
Name
Terminal block
Item
OFF (Open)
ON (Short)
IN1
TBI.1 1-2
Room thermostat 1 input
Refer to SW2-1.
IN4
TBI.1 7-8
Demand control input
Normal
Heat source OFF/Boiler operation
IN5
TBI.1 9-10
Outdoor thermostat input
Standard operation
Heat operation/Boiler operation
<Thermistor inputs>
For details on where to install the thermistors, refer to chapter “1.2 Pipe work” in this manual.
Name
Terminal block
Item
Optional part model
THW6
TBI.2 7-8
Zone 1 flow water temp. thermistor (Option)
PAC-TH011-E
THW7
TBI.2 9-10
Zone 1 return water temp. thermistor (Option)
THWB1 TBI.2 3-4
Boiler flow water temp. thermistor
—
THWB2 TBI.2 5-6
Boiler return water temp. thermistor
<Outputs>
Connect OUT10 to boiler external input (Room thermostat).
Name
Terminal block
Item
OFF
ON
Signal/Max current
OUT10
TBO.1 1-2
Boiler output
OFF
ON
non-voltage contact
• 220 - 240V AC (30V DC) 0.5 A or less
• 10 mA 5V DC or more
Note:
• OUT10 is separated by basic insulation from other external output signals in FTC4.
• Connect the surge absorber according to the load at site.
• When the wires are wired to adjacent terminals , use ring terminals and insulate the wires.
• Do not splice the wiring to extend or shorten it, or this could affect correct monitoring of each temperature.
If the wiring is too long, bundle it with a strap to adjust the length.
(External input)
Room thermostat
1
1
2
3
4
5
6
7
8
9 10 11 12 13 14
FTC4 (OUT10)
TBO.1 1-2
Boiler
Non-voltage contact
• 220 - 240V AC (30V DC) 0.5 A or less
• 10 mA 5V DC or more
