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7.2
Winterizing for seasonal use
The water heater must not be installed in a location where it
may be exposed to freezing temperatures. If the heater must be
left in a space which is likely to experience freezing
temperatures, all water must be drained from the heater. If
precautions are not taken, resulting damage will not be covered
under the warranty. NOTE: 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. Press ON/OFF switch on the water heater to turn OFF the
heater and unplug power supply cord. The display should
be blank.
2. Shut off gas supply to heater.
3. Shut off the water supply to the water heater using installer
supplied shutoff valve.
4. Open hot water taps 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 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 (100psi
max) through the inlet water connection until there is no
water present coming through the outlet water connection
of the heater.
7. Reconnect water fittings and return heater to service when
danger of freezing has passed.
8. Empty condensate trap.
7.3
Mineral scale build-up
Periodic descaling may be necessary in areas with high mineral
content in the water. Scale buildup in the heat exchanger may
result in lower flow rates, error codes of A7 and E9 and boiling
sounds in the heat exchanger.
A water softener is required if the water hardness exceeds 6
grains/gal (103 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 electrical supply from the water heater.
▶ Shut off the water supply to the water heater using (installer
supplied) shutoff valve.
▶ Open hot water taps to drain and relieve pressure from the
plumbing system.
▶ Drain water from the unit's heat exchanger by
disconnecting inlet and outlet water connections from the
heater.
C 950/C 1050 (Pro TL 175 C/199 C) – 6 720 805 440 (2019/10)
▶ Connect a line (A) from the outlet of the circulating pump
(installer supplied) to the inlet water fitting on the water
heater (see fig. 69).
▶ Using another line (B), connect the water outlet fitting 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 tank 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 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 of solution.
▶ Position a container below the hot water outlet and connect
cold water supply. Open cold water supply shutoff valve
and flush heat exchanger with clean water.
▶ Shut cold water shutoff valve and reconnect hot water
supply to the water heater.
Maintenance and service
57
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