MASCOT MSTWW, Инструкция по установке и эксплуатации

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Mascot ST Tankless Water Heater Page 57
- Flushing the Water Heater
Flushing the Heat Exchanger of water heater is a
complicated procedure and should only be done by
an authorized technician or licensed professional.
Keep in mind that improper maintenance can void
your warranty.
1. Disconnect electric power to the water heater.
2. Close the shutoff valves on both hot water outlet and
cold water inlet lines. (V1 & V2)
3. Connect one hose “D1” to the valve “V3” and place
the free end in the bucket. Connect one of the hoses
“D3” to the circulation pump outlet and the cold water
inlet line at the valve “V4”. Connect other hose “D2” to
the circulation pump inlet and place the free end in the
bucket.
4. Pour the cleaning solution into the bucket.
Place the drain hose (D1) and the hose (D2) to the pump
inlet into the cleaning solution.
5. Open service valves (V3 & V4) on the hot water outlet
and cold water inlet lines.
6. Turn on the circulation pump (Operate the pump and
allow the cleaning solution to circulate through the
water heater for at least 1 hour at a rate of 4 gallons per
minute.)
7. Rinse the cleaning solution from the water heater as
follows:
- Remove the free end of the drain hose (D1) from the
bucket.
- Close service valve, (V4), and open shutoff valve, (V2).
Do not open shutoff valve, (V1).
- Allow water to flow through the water heater for 5
minutes.
- Close shutoff valve (V2).
8. Disconnect all hoses.
9. Remove the cold water inlet filter from the water heater
and clean out any residues.
10. Reinsert the filter and ensure the filter cap is securely
tightened.
11. Connect electrical power to the water heater.
Maintenance procedures [Every 6 Months]
- Check piping. (gas and water)
Visually inspect for leaks around internal water piping.
Also inspect external water piping, circulators, relief valve
and fittings. Immediately call a qualified service technician
to repair any leaks.
Leaks must be fixed by a qualified service technician
immediately. Failure to comply with this instruction could
result in severe personal injury, death or substantial
property damage.
- Check relief valve operation
WARNING
Before proceeding with maintenance, verify that the relief
valve has be piped to a safe place, avoiding any possiblity of
scalding from hot water.
Before proceeding the procedures, verify that relief
valve outlet has been piped to a safe place of discharge,
avoiding any possibility of scalding from hot water.
If water flows freely, release the lever and allow the
valve to seat. Watch the end of the relief valve discharge
pipe to ensure that the valve does not weep after the
line has had time to drain. If the valve weeps, lift the
seat again to attempt to clean the valve seat. If the
valve continues to weep, contact your qualified service
technician for inspecting the valve and system. If water
does not flow from the valve even though you have lifted
the lever completely, the valve or discharge line may be
blocked. Shut down the Water Heater immediately. Call
your qualified service technician to inspect the water
heater and system.
- Check burner condition
The burner should be cleaned or replaced by a qualified
service technician when needed.
WARNING
Leaks must be fixed by a qualified service technician imme -
diately. Failure to comply with this instruction could result in
severe personal injury, death or substantial property damage.
This discharge line must be installed by a qualified heating
installer or a service technician.
D1
D2
D3
V3
V1
V4
V2
8.1 Annual Startup and General Maintenance
Section 8
–
Maintenance