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Maintenance and service
55
Greentherm T9800 SE 160/199 – 6 720 816 815 (2022/01)
7.1 Required annual maintenance
(To remove front cover, see page 12)
WARNING:
Maintenance must be done by a qualified contractor.
Venting System
NOTICE:
Venting system blocked!
▶ For horizontally vented appliances, keep the area around
the venting system free of snow or ice to prevent blockage.
• Venting system - Inspect inside of flue pipe and remove any
blockage or restriction. Observe burner flames during
heater operation (front cover must be removed). Burner
flames should be steady and blue. Yellow, inconsistent
(bouncing) flames may be an indication of poor ventilation
or combustion air supply. Inspect the combustion air intake
pipe and remove any blockage or debris. Inspect air intake
and exhaust terminations and remove any blockage or
debris.
Heat Exchanger
• Inspect burner observation window for cracks or spillage of
flue gases. Observe burner flames during heater operation.
Flames should be steady and blue with no signs of
yellowing. Yellow burner flames are an indication of
improper combustion. Refer to section 4.6 to verify the
exhaust system and combustion air supply meets the
manufacturer's specifications.
Pressure Relief
• Manually open the pressure relief valve to ensure proper
operation.
Inlet Water Filter
• Verify the inlet water filter screen is clean and undamaged.
The inlet water filter is located on the top of the appliance,
at the cold water inlet connection. (See fig. 29, page 38).
Close the installer supplied water shutoff valve, purge the
water using discharge drains and remove the brass hex cap
holding filter. Remove the filter, clean and/or replace if
damaged.
Descaling
• In areas where the water supply has a high mineral content
(see table 17 Water Quality) the heat exchanger must be
flushed with a descaling solution. Scale build up will
shorten the life of the water heater and damage resulting
from scale is not covered under warranty. Refer to section
7.3 for detailed instructions on descaling the heat
exchanger.
Condensate Trap
• Check for debris and clean if needed.
Air Filter
• Verify if the air filter is clean and undamaged.
The air filter is attached to the fan assembly, see fig. 50.
• Air filter must be cleaned or replaced in case it is clogged or
damaged.
How to remove/assembly air filter
▶ Disconnect the electrical supply from the water heater.
▶ Remove appliance front cover, see page 12.
▶ Loosen two philips head screws.
▶ Remove air filter from the fan.
▶ Proceed in the reverse order for assembly.
Fig. 50 Remove/assembly air filter
NOTICE:
Appliance malfunction!
▶ Air filter should not be removed during appliance normal
operation as, it may increase the risk of burner blockage.
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