Maintenance And Service; Annual Maintenance; Winterizing For Seasonal Use; Mineral Scale Build-Up - Bradford White RTG 199 MEN Installation And Operation Instructions Manual

Fig. 60 Locked condition
Whenever LCD shows , the temperature setting cannot be
adjusted because the appliance is in use by a user which already
selected a different temperature. Appliance will be automatically unlock
5 minutes after closing hot water tap.
7

Maintenance and service

DANGER:
▶ Always shut off the electrical power supply, shut off
the manual gas valve and shut off the water valves
whenever servicing.
NOTICE:
▶ Inspect and clean the complete water heating system
once a year.
▶ Carry out a maintenance as necessary. Immediately
repair all faults to avoid damage to the system.
Annual maintenance table
1. Inspect venting system
2. Inspect combustion chamber
3. Inspect burner
4. Inspect condensate trap
5. Inspect water filter
Table 35 Annual maintenance
7.1

Annual maintenance

(To remove front cover, see page 9.)
Venting System
• Venting system - inspect inside of flue pipe for any blockage or
restriction. Observe burner flames during heater operation. (front
cover must be removed). Inspect the combustion air inlet pipe for
blockage or debris. Inspect combustion air and exhaust terminations
for blockage or debris. Inspect the combustion chamber for blockage
or debris.
Combustion Chamber
• Inspect burner observation window (Fig.70, #13, page 50) 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 4.4, page 24, chapter 4.3, page 11 of
this manual to verify exhaust system and combustion air supply
meets manufacturer's specifications
Pressure Relief
• Manually open the pressure relief valve to ensure proper operation
RTG 199 ME – 6 720 811 615 (2015/04)
Inlet Water Filter
• Verify the inlet filter screen is clean and undamaged. The inlet water
filter is located on the bottom of the appliance, to the right of the cold
water inlet fitting. (See Fig.35, page 30). Close installer supplied
water shutoff and remove wireform spring clip from filter. Remove
filter, clean and or replace if damaged
Descaling
• In areas where the water supply has a high mineral content, the heat
exchanger should 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 section7.3 for detailed
instructions on descaling the heat exchanger
Fin Coils
• Inspect heat exchanger fin coils for soot build-up or blockage. If there
is evidence of soot build-up or blockage, the heat exchanger should
be removed by a professional and cleaned thoroughly
7.2
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
Every year
hot and cold water pipes is present and must be corrected before
X
proceeding.
5. Disconnect inlet and outlet water pipes from the water heater. Place
X
a small bucket underneath the water heater to catch residual water
X
remaining inside the water heater.
6. Using an air compressor, blow short bursts of air (100psi max)
X
through the inlet water connection until there is no water present
X
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 (if applicable).
7.3
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.
▶ Connect a line (A) from the outlet of the circulating pump (installer
supplied) to the inlet water fitting on the water heater (see fig. 61.)
▶ Using another line (B), connect the water outlet fitting on the water
heater. Route the other end of this line into a descaling reservoir.

Winterizing for seasonal use

Mineral scale build-up

Maintenance and service
37