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BH79T377H02
1.3 Wiring for boiler control
1
Connect OUT10 to boiler external input (room thermostat).
FTC4 (OUT10)
TBO.1 1-2
1
2
3
4
5
6
7
8
9
10 11 12 13 14
Non-voltage contact
• 220 - 240V AC (30V DC) 0.5 A or less
• 10 mA 5V DC or more
Boiler
(External input)
Room thermostat
1.4 Dip switch functions
Set Dip SW1-1 and SW2-6 to ON .
Dip switch
Function
SW1-1
Boiler
SW2-5
Automatic switch to backup heater only operation Inactive
SW2-6
Mixing tank
<Signal inputs>
When connecting room thermostat (field supply), wire the cable to IN1.
Name
Terminal block
Item
IN1
TBI.1 1-2
Room thermostat 1 input
IN4
TBI.1 7-8
Demand control input
IN5
TBI.1 9-10
Outdoor thermostat input
<Thermistor inputs>
For details on where to install the thermistors, refer to chapter "1.2 Pipe work" in this manual.
Name
Terminal block
THW6
TBI.2 7-8
Zone 1 flow water temp. thermistor (Option)
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
OUT10
TBO.1 1-2
Boiler output
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.
OFF
ON
WITHOUT Boiler
WITH Boiler
Active
WITHOUT Mixing tank
WITH Mixing tank
OFF (Open)
ON (Short)
Refer to SW2-1.
Normal
Heat source OFF/Boiler operation
Standard operation
Heat operation/Boiler operation
Item
Optional part model
PAC-TH011-E
—
OFF
ON
Signal/Max current
non-voltage contact
OFF
ON
• 220 - 240V AC (30V DC) 0.5 A or less
• 10 mA 5V DC or more
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
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
Heat source is switched based on CO
2:
2
[Intelligent settings]
Set parameters for energy saving calculation.
The following settings will be applied when "Cost" or "CO
(c) Energy price
Enter unit prices of electricity, and gas or oil (depending on boiler type) per 1 kWh.
(d) CO
emission
2
Enter CO
emission amount from electricity or boiler (gas or oil).
2
(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
Boiler
Demand control (IN4)
Heat source OFF
Boiler
Outdoor thermostat (IN5)
Heater
3. Error codes
Code Error
Action
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
Boiler circulation water temperature
LC
•
water leakage
overheat protection
•
strainer blockage
•
water circulation pump function
Boiler temperature thermistor
Re-attach any thermistors that have become dislodged. Check resistance across the
LD
(THWB1, THWB2) failure
thermistor.
LE
Boiler operation error
Re-attach any thermistors that have become dislodged. Check the status of the boiler.
Flow rate of the heating circuit from the boiler may be reduced. Check for
Boiler circulation water freeze
•
water leakage
LH
protection
•
strainer blockage
•
water circulation pump function
For boiler operation, check that Dip SW1-1 is set to ON (With Boiler) and Dip SW2-6
Setting errors of Dip switches on
is set to ON (With Mixing Tank).
LL
FTC4 control board
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).
6
Screw positions
emission) or outdoor ambient tempera-
2
emission or outdoor ambient temperature.
" is selected in Priority mode.
2
1
Place the terminal
blocks so that the
orientations of the
labels are correct.
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