Use and Care Manual

30
Periodic Maintenance
• Anti freeze products may be used for the heating system. Anti freeze for new or existing systems
requires specially formulated glycol, which contains inhibitors to prevent the glycol from attacking
the metallic system components.
• Before using anti freeze products, ensure that system fluid contains proper glycol concentration
and the inhibitor level is appropriate. Noritz recommends against exceeding a 50% concentration
of glycol.
• When using the anti freeze products, the system must be tested at least once a year, and as
recommended by the manufacturer of the glycol solution.
When Using Anti-Freeze
1. The Operation Panel is OFF and disconnect the power cord to the Combi Boiler.
2. With a bucket ready, remove the inlet and outlet drain plugs (about 0.76 gallon (2.9 L) will drain out)
3. Remove the water drain valve (with water lter) out of the inlet. (See illustration below).
4. Clean the water drain valve (with water lter) with a brush under running water.
5. Replace the water drain valve (with water lter) and close the drain plugs.
(Take care not to lose the packing.)
6.
Plug back the power cord and press the power button to power the unit on and check that water does not
leak from the drain plugs or water drain valve (with water lter) and readjust the clock time. ( p. 13)
Heating Water Inlet
Water Drain Valve (with Water Filter)
Inlet
Packing
Water drain valve
(with water filter)
Holes for pliers
* If it is difficult to remove the heating water inlet
drain plug:
Use a needle-nose pliers and insert the tips of
pliers into the holes shown below illustration.
Regular Maintenance-2