GLOW T180 - Page 54

Glow T180
Tankless Condensing Water Heater
54
INLET TEMPERATURE
SENSOR
DHW SENSOR
HI-LIMIT
SWITCH
HEAT EXCHANGER
OUTLET SENSOR
Figure 5.7 - Water heater sensors
Δ Check for continuity between the two leads. If
there is no continuity replace the switch.
Δ Unscrew the xing screws and remove the high
limit switch.
Δ Replace the high limit switch and re-assemble
the components following the above procedure
in reverse order.
Δ Switch on the electricity, water and gas supplies
and restart the appliance.
5.6.4 Water Sensors (see Figure 5.7)
Δ Make certain the sensor is properly secured in
place and making good contact with the water
pipe.
Δ Un-Plug the connecting wire.
Δ Disconnect the wire leads of the domestic
sensor. Set the multimeter to read Ohm’s and
apply the multimeter terminals to the sensor
leads. You should have a value of “Nominal
resistance at 25°C / 77°F – 10,000 Ohm”. If the
sensor does not provide the right data, as per
the table, the sensor is out of calibration and
needs to be replaced. (see section 7.10)
Δ Replace the sensor and re-assemble the
components following the above procedure in
reverse order.
Δ Switch on the electricity, water and gas supplies,
open the shut-off valves and ll the central
heating circuit. Then restart the appliance.
5.6.3 High Limit Switch (Figure 5.7)
This high limit switch opens when the
temperature in the loop exceeds 95°C. A
manual reset of the unit is required.
Δ Disconnect the voltage.
Δ Un-plug the electrode wires.
4.5 MM
(0.180”)
Figure 5.6 - Water heater electrode gap
Figure 5.5 - Electrodes distance from the burner
When inspecting the ignition electrode, a
4.5mm gap should be present between the
grounding rod and the ignition electrode.
8 1mm
8 1mm
IGNITION
ELECTRODE
BURNER
IONIZATION
ELECTRODE