Rinnai COMBI i060C, Инструкция по установке и эксплуатации, Страница: 102 / 136

102 Rinnai I-Series Condensing Boiler Combi Manual
High/Low Water Pressure

If the water pressure is too low, add water
into the system until at least 13 PSI
(0.9bar) is observed.

Ensure there are no leaking components
in the CH system.

If the pressure is too high, adjust the
pressure to a maximum of 30 PSI (2.1bar).

Ensure the pressure relief valve and water
fill are working correctly.
Low Water Cut-Off (LWCO)

Ensure the LWCO device is working
correctly.

Ensure the LWCO jumper is connected
properly when LWCO is not in use.

Ensure the output is 24 VAC on the PCB. If
it is not, check the transformer harness
and output of transformer.
Solenoid Valve Circuit

Check the flame rod and wire for damage.

Close the gas shut off valve installed near
the boiler.

Ensure the flame rod and wire are not
wet.

Check the output from the PC Board to
the solenoid gas valve.

If the output from the PC Board is
abnormal, replace the PC Board.

If the output from the PC Board is normal,
replace the gas control.
High Exhaust Temperature

Check the exhaust thermistor wiring for
damage.

Clean the surface of the thermistor.

Measure the resistance of the exhaust
thermistor.*

If the sensor has been replaced and the
error still appears, check the return
thermistor.

If the boiler is used in a hard water area,
flush the DHW plate heat exchanger.

Check the exhaust duct, seal, and venting
for damage.
Combustion Fan

Check the motor wire harness for loose or
damaged connections.

Measure resistance and voltage of motor
wire harness.*

Ensure the combustion fan spins freely.
* See “Electrical Diagnostics” on Technical Data Sheet located on inside front cover of boiler.
DHW Recirculation Pump

Ensure the DHW recirculation matches
the Parameter 12 setting.

Ensure the dedicated return line is
properly installed.

Ensure the inlet water filter and bypass
filter are clean and free of debris.

Ensure the DHW recirculation pump is
connected to the DHW Pump Terminal.

Ensure the capacity of the recirculation
pump is sized appropriately for the
piping (DHW recirculation pump should
be higher than 1.3 GPM).

Ensure air is removed from the
recirculation line.
Water Flow Control

Measure the resistance values and
voltage of the water flow control.*

Ensure the harness and connector are
not wet.

If the voltage from the PC Board is
abnormal, replace the PC Board;
otherwise, replace the water flow servo
valve.
Bypass

Measure the resistance values and
voltage of the bypass servo valve.*

Ensure the harness and connector are
not wet.

If the voltage from the PC Board is
abnormal, replace the PC Board;
otherwise, replace the bypass servo
valve.
3-Way Valve

Check the CH system water quality.

Measure the resistance values and
voltage of the 3-way valve control.*

Replace the 3-way valve control device.
Hot Water Supply Temperature
Abnormality

If the DHW water temperature is higher
than the set point temperature because
the boiler bypass servo fails to close.

Measure resistance values and voltage
of the bypass flow control.*

Replace the bypass flow control device if
needed; otherwise, check the inlet
thermistor and heat exchanger
thermistor wiring for damage.

Measure the resistance of the sensor.

Replace if needed.

Clean the sensor of any scale buildup
present.