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38
Maintenance and service
Programming “Program” function
Programming actions are similar for both controls
(appliance control pad and wireless remote control).
Fig. 62 “Program” key
Memorizing selected temperature
B
Press buttons
or
to select temperature to be
memorized.
B
Hold “Program” button for 3 seconds to save
temperature.
When LCD stops blinking, temperature is saved in
memory.
Using “Program” function
In order to select memorized temperature
B
Press “Program” key.
LCD shows pre-memorized temperature, which is now
the hot water selected temperature.
5.9
Locked condition
This condition is only valid for appliances with one or
more remote controls installed.
Fig. 63 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 unlocked after closing
the hot water tap.
6
Maintenance and service
The unit should be checked once a year by a gas
technician. If repairs are needed, the repairs should be
done by a gas technician.
6.1
Annual maintenance
(To remove front cover, see page 6.)
Venting System
• Venting system - inspect inside of flue pipe for any
blockage or restriction. Observe burner flames
during heater operation. (Vent pipe must be
removed). Inspect the combustion air inlet pipe for
blockage or debris. Inspect combustion air and
exhaust terminations for blockage or debris.
Combustion chamber
• Inspect burner observation window (Fig. 73, #10) 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 3.4 & 3.3 of this
manual to ensure that exhaust system and
combustion air supply meets manufacturer's
specifications.
Pressure relief valve
• Manually open the pressure relief valve to ensure
proper operation.
Inlet water filter
• Verify the inlet filter screen is clean and undamaged.
The inlet water filter is located above the ¾" cold
water inlet on the right side of the appliance (See
Fig. 37, page 29). Close installer supplied cold water
Warning: Always turn off the electrical
power supply, turn off the manual gas
shut off valve and turn off the water shut
off valves whenever servicing.
Caution:
B
Check and clean the complete water
heating system once a year.
B
Carry out a maintenance overhaul if
necessary. Immediately repair defects to
avoid damage to the system.
Annual maintenance table
Every year
1.
Inspect venting system
X
2.
Inspect Combustion chamber
X
3.
Inspect burner
X
4.
Inspect condensate trap
X
5.
Inspect water filter
X
Table 25
Annual maintenance
