Hydro Unit
Installation Manual
– 33 –
M
TFI
Direct Buffer tank for
Under Floor Heating
Insulation tube (minimum 1 mm)
TFI Sensor
Tying up
2 Zone hot water supply pipe
More than 4 mm
Zone 2
Under-floor Heating
(2-Way Valve Control)
▼ Fig.9-03 ▼ Fig.9-04
Setting for second remote controller
• Prepare the optional second remote controller.
• Connect the cable to terminals TB04 A,B of the Hydro Unit and remote controller.
10 Maintenance
Execute periodic maintenance at least once a year.
Check points
• Check all electrical connections and make adjustments if they are necessary.
• Check the water pipes of the heating systems in particular any evidence of leakage.
• Check the expansion tank inner pressure. If it is insufficient, enclose nitrogen or dry air in the tank.
• Check that the hydraulic pressure is 0.1 MPa (1 bar) or more with a water manometer. If it is insufficient, replenish
tap water.
• Clean the strainer.
• Check the pump for an abnormal sound or other abnormalities.
11 Troubleshooting
■ Fault symptoms
Symptom Possible cause Corrective action
Room is not heated or
cooled.
Water is not hot enough.
Incorrect remote controller setting
Check remote controller operation and temperature
setting
Incorrect function code setting Check function code setting with the function code table.
Backup heater disconnected Check backup heater and bimetal thermostat.
Insufficient capacity Check selection of equipment.
Sensor defect
Check whether temperature sensor is installed at the
normal position.
Nothing is displayed on the
remote controller.
Power is not supplied. Check power supply wiring.
Incorrect setting Check the setting with the DN codes.
Almost no or little water
flow.
Error code [A01]
Air bite in the pump Release air completely according to the procedure.
Low hydraulic pressure
Set hydraulic pressure considering pipe height, and
replenish water until manometer shows a value of set
hydraulic pressure or more.
Strainer is clogged. Clean the strainer.
Large resistance on the hydro side
Widen water path to the Hydro Unit or adopt a bypass
valve.
Malfunction of motorized 3-way valve
for hot water supply
Check wiring and parts.
Hot water leaks from
overpressure preventive
valve.
Excessive hydraulic pressure
Set hydraulic pressure considering pipe height, and
replenish water until manometer shows a value of set
hydraulic pressure or more.
Insufficient capacity of expansion tank
Check expansion tank capacity compared to total water
amount. If it is insufficient, install another expansion
tank.
Expansion tank failure Check the air pressure.
Pump lock.
Error code [A14]
Pump lock due to clogging of dust. Insert a Phillips screwdriver into the hole and turn to the
left or right to unlock.
hole
65-EN
66-EN
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