MrCool MHWH199NC U Series, Руководство по установке

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20
General Maintenance
•
Check frequently to see whether the gas supply pipelines (rubber hose) are in good
condition without aging or cracks. Pay attention to periodic replacement of rubber hoses.
In order to prevent gas leakage, check the joints of pipelines frequently by using suds to see if there are
bubbles that form. If bubbles form, there is a leak.
•
A water heater must be examined and cleaned after it has been used for a period of time (generally about
half a year) to guarantee normal operation of the heater.
•
Clean the casing of the unit with water and any neutral cleaner other than harsh chemical cleaner or volatile
solvent, otherwise the casing will fade and lose luster.
•
Clean the inlet water filter regularly.
Scale may build up inside the heat exchanger and block the passage due to the hardness of the water.
Periodic flushing is necessary in order to ensure smooth water flow. It is recommended the heat
exchanger be flushed once a year. Damage to the water heater which results from water scale
deposited WILL NOT be covered under warranty.
Please follow these steps when you wish to flush and descale the heat
exchanger. It is recommended that you contact a licensed professional
to carry out this procedure. (See Fig. 20.1)
1. Connect the empty connection of the isolation valve on the
cold water side to the outlet of the circulation pump.
2. Connect the empty connection of the isolation valve
on the hot water valve to the solution tank.
3. Connect the inlet of the circulation pump to the
solution tank.
4. Make sure there’s no leakage in any of the connectors.
5 . Fill the solution tank with descaling solution. (It’s
recommended to use white vinegar as a descaling
solution. However, if using commercial descaler,
please properly follow the instruction of the
descaler manufacturer.)
6. Turn the isolation valves and make sure the water
loop is switched to the circulation loop.
7 . Run the circulation pump until the solution that comes out
from the hot water side is clean.
8. Drain the solution from the unit.
9. Disconnect the pipes/tubes for flushing and close the empty
connectors of the isolation valves.
10. Turn the isolation valve and switch to the normal water flow.
11. Restore the power supply, gas supply and the water supply.
12.
Run the water heater for several minutes to make sure
there’s no solution remaining in the unit.
®
Isolation valve (hot)
Hot
water
Solution Tank
Cold
water
Circulation
pump
Flushing Solution
Isolation valve (cold)
Flush the heat exchanger
General Maintenance
Fig 20.1
Before performing any maintenance, please follow these steps:
Disconnect the power supply and close the gas valve.
After the power is turned off, drain the hot water from the faucet until it runs cold. Then,
close the water supply valve of the water heater.
1.)
2.)