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CAUTION
Before testing the relief valve,
make certain the discharge
pipe is properly connected to
the valve outlet, and arranged
to contain and safely dispose
of equipment discharge.
MAINTENANCE
TANKLESS WATER HEATER 199
The recommended pH of the domestic water is between 6.5 and 8.5. The internal
domestic water heat exchanger tubing and the flow sensor are subject to fouling
if exposed to hard water (over 7 grains of hardness) or has a TDS of 500mg/L or
higher. See Table 12.
DESCRIPTION
Water Pressure
Programmable water temperature
Minimum Flow Rate to Activate DHW Sensor
Acceptable pH range
Total Dissolved Solids
Total Hardness
Aluminum
Chlorides
Copper
Iron
Manganese
Zinc
Table 12: Domestic Water Quality Guidelines
4.1.12 DHW Filter cleaning instructions
Clean the DHW water filter during annual maintenance as follows:
Turn off the unit and disconnect power.
1.
Turn off the DHW hot and cold isolation valves.
2.
3.
Place a bucket under the drain and drain the DHW water from the unit.
Unscrew the water filter from the unit's cold water inlet.
4.
Clean the water filter under running water. Use a soft brush if necessary.
5.
Reinstall the water filter in the unit's cold water inlet.
6.
7.
Open the DHW hot and cold isolation valves.
8.
Reconnect the power and return the unit to operation.
4.1.13 Fan removal instructions
Turn off the power and the gas supply to the unit.
1.
2.
Remove the front cover, and allow the unit to cool down.
3.
Disconnect the electrical plug attached to the fan.
Loosen the union nut at the top of the gas valve. Carefully remove the orifice
4.
and O-ring, and keep in a safe place for re-installation later. Ensure you
protect the gas valve outlet from dust and debris.
5.
Remove the 2 hex nuts connecting the fan to the burner housing, and
carefully remove the fan. You will find a gasket attached to the fan outlet as
well as an internal check valve. Keep these items in a safe place for re-
installation.
6.
If the removed fan is to be re-installed, ensure the fan and venturi are clean
and dust free. If the fan is being replaced, move the venturi over to the new
fan. Note that the fit is tight.
MAX
MIN
150 psi
40 psi
149°F (65°C)
104°F (40°C)
N/A
0.5 GPM
8.5 pH
6.5 pH
500 mg/L
200 mg/L 11.68 gr/gal
0.05 to 0.2 mg/L
250 mg/L
1.0 mg/L
0.3 mg/L
0.05 mg/L
5 mg/L
4-3
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