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Maintenance and service
Greentherm T9800 SE 160/199 – 6 720 816 815 (2022/01)
56
NOTICE:
Risk of burner blockage!
▶ Optional paper filter (part # 8738725270) can be
installed on the air fan for increased protection against
dusty, dirty combustion air or heavy pollen entering the
combustion chamber to reduce the risk of burner blockage.
In areas with high solid particles content in the air it is
recommended to use this filter. Maintenance frequency
might need to be adjusted to keep the filter clean and allow
a good performance of the heater.
7.2 Winterizing for seasonal use
The water heater must not be installed in a location where it
may be exposed to freezing temperatures unless connected to
electrical power. All water must be drained from the heater in
order to avoid damage to the unit from exposure to freezing
temperatures.
NOTICE:
Use of agents such as anti-freeze is not permitted and voids the
warranty, as they may cause damage to the water heater's
internal components.
1. Hold ON/OFF switch on the water heater for 3 secs. to turn
OFF the heater and unplug the power supply cord. The
display should be blank.
2. Shut off the gas supply to the water heater.
3. Shut off the water supply to the water heater using installer
supplied shutoff valve.
4. Open hot water faucets to drain and relieve pressure from
the plumbing system. If water continues to flow after 5
minutes, a crossover of the hot and cold water pipes is
present and must be corrected before proceeding.
5. Disconnect the inlet and outlet water pipes from the water
heater. Place a small bucket underneath the water heater to
catch residual water remaining inside the water heater.
6. Using an air compressor, blow short bursts of air (50 psi
max) through the inlet water connection or inlet water filter
until there is no water present coming through the outlet
water connection of the heater.
7. Empty condensate trap.
8. Reconnect the water fittings and return the heater to
service when danger of freezing has passed.
7.3 Mineral scale build-up
Periodic descaling may be necessary in areas with high mineral
content in the water (see table 17 Water Quality). Scale
buildup in the heat exchanger may result in lower flow rates,
error codes of AA, E3,E5 and boiling sounds in the heat
exchanger.
A water softener is required if the water hardness exceeds 12
grains/gal (200 mg/l) calcium carbonate. Damage to the water
heater resulting from hard water/scale deposits will not be
covered under warranty.
Descaling using a pump
▶ Disconnect the electrical supply from the water heater.
▶ Shut off the cold water supply to the water heater.
▶ Open hot water faucets to drain and relieve pressure from
the plumbing system.
▶ Shut off hot water supply valve to isolate the water heater
from house plumbing.
▶ Remove the caps from both inlet and outlet drain
connections.
▶ Connect a line (A) from the outlet of the circulating pump
(installer supplied) to the inlet drain connection on the
water heater (see fig. 51.)
▶ Using another line (B), connect the outlet drain connection
on the water heater. Route the other end of this line into a
descaling reservoir.
▶ Using a 3rd line (C) from the descaling reservoir, connect to
the inlet side of circulating pump. Install a filter on the end
of the line in the descaling reservoir.
▶ Make sure all connections are water tight.
▶ Fill the descaling reservoir with descaling solution so both
lines inside are submersed. We recommend a straight
white vinegar solution. If using a commercial descalant,
refer to manufacturer's instructions for proper dilution
ratio.
▶Operate the circulating pump.
▶ Make sure there are no leaks and the solution is flowing
from the descaling reservoir through the heater and
returning to the reservoir.
▶ Run the solution through the heater until the solution
returning to the descaling reservoir comes out clear.
(Changing to a fresh solution may be necessary during this
process).
▶ Disconnect all lines and drain all solution from heat
exchanger. Properly discard the solution.
▶ Attach the cap to the inlet drain connection to close it.
▶ Position a container below the outlet drain connection and
connect the cold water supply. Open the cold water supply
shutoff valve and flush the heat exchanger with clean water.
▶ Close the cold water shutoff valve and reconnect hot water
supply to the water heater.
▶ Attach the cap to the outlet drain connection to close it.
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